text: /*
   *  Elliptic curves over GF(p): curve-specific data and functions
   *
   *  Copyright The Mbed TLS Contributors
   *  SPDX-License-Identifier: Apache-2.0
   *
   *  Licensed under the Apache License, Version 2.0 (the "License"); you may
   *  not use this file except in compliance with the License.
   *  You may obtain a copy of the License at
   *
   *  http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   */
  
  #include "common.h"
  
  #if defined(MBEDTLS_ECP_C)
  
  #include "mbedtls/ecp.h"
  #include "mbedtls/platform_util.h"
  #include "mbedtls/error.h"
  
  #include <string.h>
  
  #if defined(MBEDTLS_ECP_ALT)
  /* Parameter validation macros based on platform_util.h */
  #define ECP_VALIDATE_RET( cond )    \
      MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_ECP_BAD_INPUT_DATA )
  #define ECP_VALIDATE( cond )        \
      MBEDTLS_INTERNAL_VALIDATE( cond )
  
  #if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
      !defined(inline) && !defined(__cplusplus)
  #define inline __inline
  #endif
  
  /*
   * Conversion macros for embedded constants:
   * build lists of mbedtls_mpi_uint's from lists of unsigned char's grouped by 8, 4 or 2
   */
  #if defined(MBEDTLS_HAVE_INT32)
  
  #define BYTES_TO_T_UINT_4( a, b, c, d )                       \
      ( (mbedtls_mpi_uint) (a) <<  0 ) |                        \
      ( (mbedtls_mpi_uint) (b) <<  8 ) |                        \
      ( (mbedtls_mpi_uint) (c) << 16 ) |                        \
      ( (mbedtls_mpi_uint) (d) << 24 )
  
  #define BYTES_TO_T_UINT_2( a, b )                   \
      BYTES_TO_T_UINT_4( a, b, 0, 0 )
  
  #define BYTES_TO_T_UINT_8( a, b, c, d, e, f, g, h ) \
      BYTES_TO_T_UINT_4( a, b, c, d ),                \
      BYTES_TO_T_UINT_4( e, f, g, h )
  
  #else /* 64-bits */
  
  #define BYTES_TO_T_UINT_8( a, b, c, d, e, f, g, h ) \
      ( (mbedtls_mpi_uint) (a) <<  0 ) |                        \
      ( (mbedtls_mpi_uint) (b) <<  8 ) |                        \
      ( (mbedtls_mpi_uint) (c) << 16 ) |                        \
      ( (mbedtls_mpi_uint) (d) << 24 ) |                        \
      ( (mbedtls_mpi_uint) (e) << 32 ) |                        \
      ( (mbedtls_mpi_uint) (f) << 40 ) |                        \
      ( (mbedtls_mpi_uint) (g) << 48 ) |                        \
      ( (mbedtls_mpi_uint) (h) << 56 )
  
  #define BYTES_TO_T_UINT_4( a, b, c, d )             \
      BYTES_TO_T_UINT_8( a, b, c, d, 0, 0, 0, 0 )
  
  #define BYTES_TO_T_UINT_2( a, b )                   \
      BYTES_TO_T_UINT_8( a, b, 0, 0, 0, 0, 0, 0 )
  
  #endif /* bits in mbedtls_mpi_uint */
  
  /*
   * Note: the constants are in little-endian order
   * to be directly usable in MPIs
   */
  
  /*
   * Domain parameters for secp192r1
   */
  /*
   * NXP: Our HW implementation requires the entire group (parameter A included) to be defined.
   */
  #if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED)
  static const mbedtls_mpi_uint secp192r1_p[] = {
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  static const mbedtls_mpi_uint secp192r1_a[] = {
      BYTES_TO_T_UINT_8( 0xFC, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  static const mbedtls_mpi_uint secp192r1_b[] = {
      BYTES_TO_T_UINT_8( 0xB1, 0xB9, 0x46, 0xC1, 0xEC, 0xDE, 0xB8, 0xFE ),
      BYTES_TO_T_UINT_8( 0x49, 0x30, 0x24, 0x72, 0xAB, 0xE9, 0xA7, 0x0F ),
      BYTES_TO_T_UINT_8( 0xE7, 0x80, 0x9C, 0xE5, 0x19, 0x05, 0x21, 0x64 ),
  };
  static const mbedtls_mpi_uint secp192r1_gx[] = {
      BYTES_TO_T_UINT_8( 0x12, 0x10, 0xFF, 0x82, 0xFD, 0x0A, 0xFF, 0xF4 ),
      BYTES_TO_T_UINT_8( 0x00, 0x88, 0xA1, 0x43, 0xEB, 0x20, 0xBF, 0x7C ),
      BYTES_TO_T_UINT_8( 0xF6, 0x90, 0x30, 0xB0, 0x0E, 0xA8, 0x8D, 0x18 ),
  };
  static const mbedtls_mpi_uint secp192r1_gy[] = {
      BYTES_TO_T_UINT_8( 0x11, 0x48, 0x79, 0x1E, 0xA1, 0x77, 0xF9, 0x73 ),
      BYTES_TO_T_UINT_8( 0xD5, 0xCD, 0x24, 0x6B, 0xED, 0x11, 0x10, 0x63 ),
      BYTES_TO_T_UINT_8( 0x78, 0xDA, 0xC8, 0xFF, 0x95, 0x2B, 0x19, 0x07 ),
  };
  static const mbedtls_mpi_uint secp192r1_n[] = {
      BYTES_TO_T_UINT_8( 0x31, 0x28, 0xD2, 0xB4, 0xB1, 0xC9, 0x6B, 0x14 ),
      BYTES_TO_T_UINT_8( 0x36, 0xF8, 0xDE, 0x99, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  #endif /* MBEDTLS_ECP_DP_SECP192R1_ENABLED */
  
  /*
   * Domain parameters for secp224r1
   */
  #if defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED)
  static const mbedtls_mpi_uint secp224r1_p[] = {
      BYTES_TO_T_UINT_8( 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ),
      BYTES_TO_T_UINT_8( 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00 ),
  };
  static const mbedtls_mpi_uint secp224r1_a[] = {
      BYTES_TO_T_UINT_8( 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_4( 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  static const mbedtls_mpi_uint secp224r1_b[] = {
      BYTES_TO_T_UINT_8( 0xB4, 0xFF, 0x55, 0x23, 0x43, 0x39, 0x0B, 0x27 ),
      BYTES_TO_T_UINT_8( 0xBA, 0xD8, 0xBF, 0xD7, 0xB7, 0xB0, 0x44, 0x50 ),
      BYTES_TO_T_UINT_8( 0x56, 0x32, 0x41, 0xF5, 0xAB, 0xB3, 0x04, 0x0C ),
      BYTES_TO_T_UINT_4( 0x85, 0x0A, 0x05, 0xB4 ),
  };
  static const mbedtls_mpi_uint secp224r1_gx[] = {
      BYTES_TO_T_UINT_8( 0x21, 0x1D, 0x5C, 0x11, 0xD6, 0x80, 0x32, 0x34 ),
      BYTES_TO_T_UINT_8( 0x22, 0x11, 0xC2, 0x56, 0xD3, 0xC1, 0x03, 0x4A ),
      BYTES_TO_T_UINT_8( 0xB9, 0x90, 0x13, 0x32, 0x7F, 0xBF, 0xB4, 0x6B ),
      BYTES_TO_T_UINT_4( 0xBD, 0x0C, 0x0E, 0xB7 ),
  };
  static const mbedtls_mpi_uint secp224r1_gy[] = {
      BYTES_TO_T_UINT_8( 0x34, 0x7E, 0x00, 0x85, 0x99, 0x81, 0xD5, 0x44 ),
      BYTES_TO_T_UINT_8( 0x64, 0x47, 0x07, 0x5A, 0xA0, 0x75, 0x43, 0xCD ),
      BYTES_TO_T_UINT_8( 0xE6, 0xDF, 0x22, 0x4C, 0xFB, 0x23, 0xF7, 0xB5 ),
      BYTES_TO_T_UINT_4( 0x88, 0x63, 0x37, 0xBD ),
  };
  static const mbedtls_mpi_uint secp224r1_n[] = {
      BYTES_TO_T_UINT_8( 0x3D, 0x2A, 0x5C, 0x5C, 0x45, 0x29, 0xDD, 0x13 ),
      BYTES_TO_T_UINT_8( 0x3E, 0xF0, 0xB8, 0xE0, 0xA2, 0x16, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_4( 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  #endif /* MBEDTLS_ECP_DP_SECP224R1_ENABLED */
  
  /*
   * Domain parameters for secp256r1
   */
  #if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
  static const mbedtls_mpi_uint secp256r1_p[] = {
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00 ),
      BYTES_TO_T_UINT_8( 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ),
      BYTES_TO_T_UINT_8( 0x01, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  static const mbedtls_mpi_uint secp256r1_a[] = {
      BYTES_TO_T_UINT_8( 0xFC, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00 ),
      BYTES_TO_T_UINT_8( 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ),
      BYTES_TO_T_UINT_8( 0x01, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  static const mbedtls_mpi_uint secp256r1_b[] = {
      BYTES_TO_T_UINT_8( 0x4B, 0x60, 0xD2, 0x27, 0x3E, 0x3C, 0xCE, 0x3B ),
      BYTES_TO_T_UINT_8( 0xF6, 0xB0, 0x53, 0xCC, 0xB0, 0x06, 0x1D, 0x65 ),
      BYTES_TO_T_UINT_8( 0xBC, 0x86, 0x98, 0x76, 0x55, 0xBD, 0xEB, 0xB3 ),
      BYTES_TO_T_UINT_8( 0xE7, 0x93, 0x3A, 0xAA, 0xD8, 0x35, 0xC6, 0x5A ),
  };
  static const mbedtls_mpi_uint secp256r1_gx[] = {
      BYTES_TO_T_UINT_8( 0x96, 0xC2, 0x98, 0xD8, 0x45, 0x39, 0xA1, 0xF4 ),
      BYTES_TO_T_UINT_8( 0xA0, 0x33, 0xEB, 0x2D, 0x81, 0x7D, 0x03, 0x77 ),
      BYTES_TO_T_UINT_8( 0xF2, 0x40, 0xA4, 0x63, 0xE5, 0xE6, 0xBC, 0xF8 ),
      BYTES_TO_T_UINT_8( 0x47, 0x42, 0x2C, 0xE1, 0xF2, 0xD1, 0x17, 0x6B ),
  };
  static const mbedtls_mpi_uint secp256r1_gy[] = {
      BYTES_TO_T_UINT_8( 0xF5, 0x51, 0xBF, 0x37, 0x68, 0x40, 0xB6, 0xCB ),
      BYTES_TO_T_UINT_8( 0xCE, 0x5E, 0x31, 0x6B, 0x57, 0x33, 0xCE, 0x2B ),
      BYTES_TO_T_UINT_8( 0x16, 0x9E, 0x0F, 0x7C, 0x4A, 0xEB, 0xE7, 0x8E ),
      BYTES_TO_T_UINT_8( 0x9B, 0x7F, 0x1A, 0xFE, 0xE2, 0x42, 0xE3, 0x4F ),
  };
  static const mbedtls_mpi_uint secp256r1_n[] = {
      BYTES_TO_T_UINT_8( 0x51, 0x25, 0x63, 0xFC, 0xC2, 0xCA, 0xB9, 0xF3 ),
      BYTES_TO_T_UINT_8( 0x84, 0x9E, 0x17, 0xA7, 0xAD, 0xFA, 0xE6, 0xBC ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  #endif /* MBEDTLS_ECP_DP_SECP256R1_ENABLED */
  
  /*
   * Domain parameters for secp384r1
   */
  #if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
  static const mbedtls_mpi_uint secp384r1_p[] = {
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00 ),
      BYTES_TO_T_UINT_8( 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  static const mbedtls_mpi_uint secp384r1_a[] = {
      BYTES_TO_T_UINT_8( 0xFC, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00 ),
      BYTES_TO_T_UINT_8( 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  static const mbedtls_mpi_uint secp384r1_b[] = {
      BYTES_TO_T_UINT_8( 0xEF, 0x2A, 0xEC, 0xD3, 0xED, 0xC8, 0x85, 0x2A ),
      BYTES_TO_T_UINT_8( 0x9D, 0xD1, 0x2E, 0x8A, 0x8D, 0x39, 0x56, 0xC6 ),
      BYTES_TO_T_UINT_8( 0x5A, 0x87, 0x13, 0x50, 0x8F, 0x08, 0x14, 0x03 ),
      BYTES_TO_T_UINT_8( 0x12, 0x41, 0x81, 0xFE, 0x6E, 0x9C, 0x1D, 0x18 ),
      BYTES_TO_T_UINT_8( 0x19, 0x2D, 0xF8, 0xE3, 0x6B, 0x05, 0x8E, 0x98 ),
      BYTES_TO_T_UINT_8( 0xE4, 0xE7, 0x3E, 0xE2, 0xA7, 0x2F, 0x31, 0xB3 ),
  };
  static const mbedtls_mpi_uint secp384r1_gx[] = {
      BYTES_TO_T_UINT_8( 0xB7, 0x0A, 0x76, 0x72, 0x38, 0x5E, 0x54, 0x3A ),
      BYTES_TO_T_UINT_8( 0x6C, 0x29, 0x55, 0xBF, 0x5D, 0xF2, 0x02, 0x55 ),
      BYTES_TO_T_UINT_8( 0x38, 0x2A, 0x54, 0x82, 0xE0, 0x41, 0xF7, 0x59 ),
      BYTES_TO_T_UINT_8( 0x98, 0x9B, 0xA7, 0x8B, 0x62, 0x3B, 0x1D, 0x6E ),
      BYTES_TO_T_UINT_8( 0x74, 0xAD, 0x20, 0xF3, 0x1E, 0xC7, 0xB1, 0x8E ),
      BYTES_TO_T_UINT_8( 0x37, 0x05, 0x8B, 0xBE, 0x22, 0xCA, 0x87, 0xAA ),
  };
  static const mbedtls_mpi_uint secp384r1_gy[] = {
      BYTES_TO_T_UINT_8( 0x5F, 0x0E, 0xEA, 0x90, 0x7C, 0x1D, 0x43, 0x7A ),
      BYTES_TO_T_UINT_8( 0x9D, 0x81, 0x7E, 0x1D, 0xCE, 0xB1, 0x60, 0x0A ),
      BYTES_TO_T_UINT_8( 0xC0, 0xB8, 0xF0, 0xB5, 0x13, 0x31, 0xDA, 0xE9 ),
      BYTES_TO_T_UINT_8( 0x7C, 0x14, 0x9A, 0x28, 0xBD, 0x1D, 0xF4, 0xF8 ),
      BYTES_TO_T_UINT_8( 0x29, 0xDC, 0x92, 0x92, 0xBF, 0x98, 0x9E, 0x5D ),
      BYTES_TO_T_UINT_8( 0x6F, 0x2C, 0x26, 0x96, 0x4A, 0xDE, 0x17, 0x36 ),
  };
  static const mbedtls_mpi_uint secp384r1_n[] = {
      BYTES_TO_T_UINT_8( 0x73, 0x29, 0xC5, 0xCC, 0x6A, 0x19, 0xEC, 0xEC ),
      BYTES_TO_T_UINT_8( 0x7A, 0xA7, 0xB0, 0x48, 0xB2, 0x0D, 0x1A, 0x58 ),
      BYTES_TO_T_UINT_8( 0xDF, 0x2D, 0x37, 0xF4, 0x81, 0x4D, 0x63, 0xC7 ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  #endif /* MBEDTLS_ECP_DP_SECP384R1_ENABLED */
  
  /*
   * Domain parameters for secp521r1
   */
  #if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED)
  static const mbedtls_mpi_uint secp521r1_p[] = {
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_2( 0xFF, 0x01 ),
  };
  static const mbedtls_mpi_uint secp521r1_a[] = {
      BYTES_TO_T_UINT_8( 0xFC, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_2( 0xFF, 0x01 ),
  };
  static const mbedtls_mpi_uint secp521r1_b[] = {
      BYTES_TO_T_UINT_8( 0x00, 0x3F, 0x50, 0x6B, 0xD4, 0x1F, 0x45, 0xEF ),
      BYTES_TO_T_UINT_8( 0xF1, 0x34, 0x2C, 0x3D, 0x88, 0xDF, 0x73, 0x35 ),
      BYTES_TO_T_UINT_8( 0x07, 0xBF, 0xB1, 0x3B, 0xBD, 0xC0, 0x52, 0x16 ),
      BYTES_TO_T_UINT_8( 0x7B, 0x93, 0x7E, 0xEC, 0x51, 0x39, 0x19, 0x56 ),
      BYTES_TO_T_UINT_8( 0xE1, 0x09, 0xF1, 0x8E, 0x91, 0x89, 0xB4, 0xB8 ),
      BYTES_TO_T_UINT_8( 0xF3, 0x15, 0xB3, 0x99, 0x5B, 0x72, 0xDA, 0xA2 ),
      BYTES_TO_T_UINT_8( 0xEE, 0x40, 0x85, 0xB6, 0xA0, 0x21, 0x9A, 0x92 ),
      BYTES_TO_T_UINT_8( 0x1F, 0x9A, 0x1C, 0x8E, 0x61, 0xB9, 0x3E, 0x95 ),
      BYTES_TO_T_UINT_2( 0x51, 0x00 ),
  };
  static const mbedtls_mpi_uint secp521r1_gx[] = {
      BYTES_TO_T_UINT_8( 0x66, 0xBD, 0xE5, 0xC2, 0x31, 0x7E, 0x7E, 0xF9 ),
      BYTES_TO_T_UINT_8( 0x9B, 0x42, 0x6A, 0x85, 0xC1, 0xB3, 0x48, 0x33 ),
      BYTES_TO_T_UINT_8( 0xDE, 0xA8, 0xFF, 0xA2, 0x27, 0xC1, 0x1D, 0xFE ),
      BYTES_TO_T_UINT_8( 0x28, 0x59, 0xE7, 0xEF, 0x77, 0x5E, 0x4B, 0xA1 ),
      BYTES_TO_T_UINT_8( 0xBA, 0x3D, 0x4D, 0x6B, 0x60, 0xAF, 0x28, 0xF8 ),
      BYTES_TO_T_UINT_8( 0x21, 0xB5, 0x3F, 0x05, 0x39, 0x81, 0x64, 0x9C ),
      BYTES_TO_T_UINT_8( 0x42, 0xB4, 0x95, 0x23, 0x66, 0xCB, 0x3E, 0x9E ),
      BYTES_TO_T_UINT_8( 0xCD, 0xE9, 0x04, 0x04, 0xB7, 0x06, 0x8E, 0x85 ),
      BYTES_TO_T_UINT_2( 0xC6, 0x00 ),
  };
  static const mbedtls_mpi_uint secp521r1_gy[] = {
      BYTES_TO_T_UINT_8( 0x50, 0x66, 0xD1, 0x9F, 0x76, 0x94, 0xBE, 0x88 ),
      BYTES_TO_T_UINT_8( 0x40, 0xC2, 0x72, 0xA2, 0x86, 0x70, 0x3C, 0x35 ),
      BYTES_TO_T_UINT_8( 0x61, 0x07, 0xAD, 0x3F, 0x01, 0xB9, 0x50, 0xC5 ),
      BYTES_TO_T_UINT_8( 0x40, 0x26, 0xF4, 0x5E, 0x99, 0x72, 0xEE, 0x97 ),
      BYTES_TO_T_UINT_8( 0x2C, 0x66, 0x3E, 0x27, 0x17, 0xBD, 0xAF, 0x17 ),
      BYTES_TO_T_UINT_8( 0x68, 0x44, 0x9B, 0x57, 0x49, 0x44, 0xF5, 0x98 ),
      BYTES_TO_T_UINT_8( 0xD9, 0x1B, 0x7D, 0x2C, 0xB4, 0x5F, 0x8A, 0x5C ),
      BYTES_TO_T_UINT_8( 0x04, 0xC0, 0x3B, 0x9A, 0x78, 0x6A, 0x29, 0x39 ),
      BYTES_TO_T_UINT_2( 0x18, 0x01 ),
  };
  static const mbedtls_mpi_uint secp521r1_n[] = {
      BYTES_TO_T_UINT_8( 0x09, 0x64, 0x38, 0x91, 0x1E, 0xB7, 0x6F, 0xBB ),
      BYTES_TO_T_UINT_8( 0xAE, 0x47, 0x9C, 0x89, 0xB8, 0xC9, 0xB5, 0x3B ),
      BYTES_TO_T_UINT_8( 0xD0, 0xA5, 0x09, 0xF7, 0x48, 0x01, 0xCC, 0x7F ),
      BYTES_TO_T_UINT_8( 0x6B, 0x96, 0x2F, 0xBF, 0x83, 0x87, 0x86, 0x51 ),
      BYTES_TO_T_UINT_8( 0xFA, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_2( 0xFF, 0x01 ),
  };
  #endif /* MBEDTLS_ECP_DP_SECP521R1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED)
  static const mbedtls_mpi_uint secp192k1_p[] = {
      BYTES_TO_T_UINT_8( 0x37, 0xEE, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  static const mbedtls_mpi_uint secp192k1_a[] = {
      BYTES_TO_T_UINT_2( 0x00, 0x00 ),
  };
  static const mbedtls_mpi_uint secp192k1_b[] = {
      BYTES_TO_T_UINT_2( 0x03, 0x00 ),
  };
  static const mbedtls_mpi_uint secp192k1_gx[] = {
      BYTES_TO_T_UINT_8( 0x7D, 0x6C, 0xE0, 0xEA, 0xB1, 0xD1, 0xA5, 0x1D ),
      BYTES_TO_T_UINT_8( 0x34, 0xF4, 0xB7, 0x80, 0x02, 0x7D, 0xB0, 0x26 ),
      BYTES_TO_T_UINT_8( 0xAE, 0xE9, 0x57, 0xC0, 0x0E, 0xF1, 0x4F, 0xDB ),
  };
  static const mbedtls_mpi_uint secp192k1_gy[] = {
      BYTES_TO_T_UINT_8( 0x9D, 0x2F, 0x5E, 0xD9, 0x88, 0xAA, 0x82, 0x40 ),
      BYTES_TO_T_UINT_8( 0x34, 0x86, 0xBE, 0x15, 0xD0, 0x63, 0x41, 0x84 ),
      BYTES_TO_T_UINT_8( 0xA7, 0x28, 0x56, 0x9C, 0x6D, 0x2F, 0x2F, 0x9B ),
  };
  static const mbedtls_mpi_uint secp192k1_n[] = {
      BYTES_TO_T_UINT_8( 0x8D, 0xFD, 0xDE, 0x74, 0x6A, 0x46, 0x69, 0x0F ),
      BYTES_TO_T_UINT_8( 0x17, 0xFC, 0xF2, 0x26, 0xFE, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  #endif /* MBEDTLS_ECP_DP_SECP192K1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED)
  static const mbedtls_mpi_uint secp224k1_p[] = {
      BYTES_TO_T_UINT_8( 0x6D, 0xE5, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_4( 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  static const mbedtls_mpi_uint secp224k1_a[] = {
      BYTES_TO_T_UINT_2( 0x00, 0x00 ),
  };
  static const mbedtls_mpi_uint secp224k1_b[] = {
      BYTES_TO_T_UINT_2( 0x05, 0x00 ),
  };
  static const mbedtls_mpi_uint secp224k1_gx[] = {
      BYTES_TO_T_UINT_8( 0x5C, 0xA4, 0xB7, 0xB6, 0x0E, 0x65, 0x7E, 0x0F ),
      BYTES_TO_T_UINT_8( 0xA9, 0x75, 0x70, 0xE4, 0xE9, 0x67, 0xA4, 0x69 ),
      BYTES_TO_T_UINT_8( 0xA1, 0x28, 0xFC, 0x30, 0xDF, 0x99, 0xF0, 0x4D ),
      BYTES_TO_T_UINT_4( 0x33, 0x5B, 0x45, 0xA1 ),
  };
  static const mbedtls_mpi_uint secp224k1_gy[] = {
      BYTES_TO_T_UINT_8( 0xA5, 0x61, 0x6D, 0x55, 0xDB, 0x4B, 0xCA, 0xE2 ),
      BYTES_TO_T_UINT_8( 0x59, 0xBD, 0xB0, 0xC0, 0xF7, 0x19, 0xE3, 0xF7 ),
      BYTES_TO_T_UINT_8( 0xD6, 0xFB, 0xCA, 0x82, 0x42, 0x34, 0xBA, 0x7F ),
      BYTES_TO_T_UINT_4( 0xED, 0x9F, 0x08, 0x7E ),
  };
  static const mbedtls_mpi_uint secp224k1_n[] = {
      BYTES_TO_T_UINT_8( 0xF7, 0xB1, 0x9F, 0x76, 0x71, 0xA9, 0xF0, 0xCA ),
      BYTES_TO_T_UINT_8( 0x84, 0x61, 0xEC, 0xD2, 0xE8, 0xDC, 0x01, 0x00 ),
      BYTES_TO_T_UINT_8( 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ),
      BYTES_TO_T_UINT_8( 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00 ),
  };
  #endif /* MBEDTLS_ECP_DP_SECP224K1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED)
  static const mbedtls_mpi_uint secp256k1_p[] = {
      BYTES_TO_T_UINT_8( 0x2F, 0xFC, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  static const mbedtls_mpi_uint secp256k1_a[] = {
      BYTES_TO_T_UINT_2( 0x00, 0x00 ),
  };
  static const mbedtls_mpi_uint secp256k1_b[] = {
      BYTES_TO_T_UINT_2( 0x07, 0x00 ),
  };
  static const mbedtls_mpi_uint secp256k1_gx[] = {
      BYTES_TO_T_UINT_8( 0x98, 0x17, 0xF8, 0x16, 0x5B, 0x81, 0xF2, 0x59 ),
      BYTES_TO_T_UINT_8( 0xD9, 0x28, 0xCE, 0x2D, 0xDB, 0xFC, 0x9B, 0x02 ),
      BYTES_TO_T_UINT_8( 0x07, 0x0B, 0x87, 0xCE, 0x95, 0x62, 0xA0, 0x55 ),
      BYTES_TO_T_UINT_8( 0xAC, 0xBB, 0xDC, 0xF9, 0x7E, 0x66, 0xBE, 0x79 ),
  };
  static const mbedtls_mpi_uint secp256k1_gy[] = {
      BYTES_TO_T_UINT_8( 0xB8, 0xD4, 0x10, 0xFB, 0x8F, 0xD0, 0x47, 0x9C ),
      BYTES_TO_T_UINT_8( 0x19, 0x54, 0x85, 0xA6, 0x48, 0xB4, 0x17, 0xFD ),
      BYTES_TO_T_UINT_8( 0xA8, 0x08, 0x11, 0x0E, 0xFC, 0xFB, 0xA4, 0x5D ),
      BYTES_TO_T_UINT_8( 0x65, 0xC4, 0xA3, 0x26, 0x77, 0xDA, 0x3A, 0x48 ),
  };
  static const mbedtls_mpi_uint secp256k1_n[] = {
      BYTES_TO_T_UINT_8( 0x41, 0x41, 0x36, 0xD0, 0x8C, 0x5E, 0xD2, 0xBF ),
      BYTES_TO_T_UINT_8( 0x3B, 0xA0, 0x48, 0xAF, 0xE6, 0xDC, 0xAE, 0xBA ),
      BYTES_TO_T_UINT_8( 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
      BYTES_TO_T_UINT_8( 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF ),
  };
  #endif /* MBEDTLS_ECP_DP_SECP256K1_ENABLED */
  
  /*
   * Domain parameters for brainpoolP256r1 (RFC 5639 3.4)
   */
  #if defined(MBEDTLS_ECP_DP_BP256R1_ENABLED)
  static const mbedtls_mpi_uint brainpoolP256r1_p[] = {
      BYTES_TO_T_UINT_8( 0x77, 0x53, 0x6E, 0x1F, 0x1D, 0x48, 0x13, 0x20 ),
      BYTES_TO_T_UINT_8( 0x28, 0x20, 0x26, 0xD5, 0x23, 0xF6, 0x3B, 0x6E ),
      BYTES_TO_T_UINT_8( 0x72, 0x8D, 0x83, 0x9D, 0x90, 0x0A, 0x66, 0x3E ),
      BYTES_TO_T_UINT_8( 0xBC, 0xA9, 0xEE, 0xA1, 0xDB, 0x57, 0xFB, 0xA9 ),
  };
  static const mbedtls_mpi_uint brainpoolP256r1_a[] = {
      BYTES_TO_T_UINT_8( 0xD9, 0xB5, 0x30, 0xF3, 0x44, 0x4B, 0x4A, 0xE9 ),
      BYTES_TO_T_UINT_8( 0x6C, 0x5C, 0xDC, 0x26, 0xC1, 0x55, 0x80, 0xFB ),
      BYTES_TO_T_UINT_8( 0xE7, 0xFF, 0x7A, 0x41, 0x30, 0x75, 0xF6, 0xEE ),
      BYTES_TO_T_UINT_8( 0x57, 0x30, 0x2C, 0xFC, 0x75, 0x09, 0x5A, 0x7D ),
  };
  static const mbedtls_mpi_uint brainpoolP256r1_b[] = {
      BYTES_TO_T_UINT_8( 0xB6, 0x07, 0x8C, 0xFF, 0x18, 0xDC, 0xCC, 0x6B ),
      BYTES_TO_T_UINT_8( 0xCE, 0xE1, 0xF7, 0x5C, 0x29, 0x16, 0x84, 0x95 ),
      BYTES_TO_T_UINT_8( 0xBF, 0x7C, 0xD7, 0xBB, 0xD9, 0xB5, 0x30, 0xF3 ),
      BYTES_TO_T_UINT_8( 0x44, 0x4B, 0x4A, 0xE9, 0x6C, 0x5C, 0xDC, 0x26 ),
  };
  static const mbedtls_mpi_uint brainpoolP256r1_gx[] = {
      BYTES_TO_T_UINT_8( 0x62, 0x32, 0xCE, 0x9A, 0xBD, 0x53, 0x44, 0x3A ),
      BYTES_TO_T_UINT_8( 0xC2, 0x23, 0xBD, 0xE3, 0xE1, 0x27, 0xDE, 0xB9 ),
      BYTES_TO_T_UINT_8( 0xAF, 0xB7, 0x81, 0xFC, 0x2F, 0x48, 0x4B, 0x2C ),
      BYTES_TO_T_UINT_8( 0xCB, 0x57, 0x7E, 0xCB, 0xB9, 0xAE, 0xD2, 0x8B ),
  };
  static const mbedtls_mpi_uint brainpoolP256r1_gy[] = {
      BYTES_TO_T_UINT_8( 0x97, 0x69, 0x04, 0x2F, 0xC7, 0x54, 0x1D, 0x5C ),
      BYTES_TO_T_UINT_8( 0x54, 0x8E, 0xED, 0x2D, 0x13, 0x45, 0x77, 0xC2 ),
      BYTES_TO_T_UINT_8( 0xC9, 0x1D, 0x61, 0x14, 0x1A, 0x46, 0xF8, 0x97 ),
      BYTES_TO_T_UINT_8( 0xFD, 0xC4, 0xDA, 0xC3, 0x35, 0xF8, 0x7E, 0x54 ),
  };
  static const mbedtls_mpi_uint brainpoolP256r1_n[] = {
      BYTES_TO_T_UINT_8( 0xA7, 0x56, 0x48, 0x97, 0x82, 0x0E, 0x1E, 0x90 ),
      BYTES_TO_T_UINT_8( 0xF7, 0xA6, 0x61, 0xB5, 0xA3, 0x7A, 0x39, 0x8C ),
      BYTES_TO_T_UINT_8( 0x71, 0x8D, 0x83, 0x9D, 0x90, 0x0A, 0x66, 0x3E ),
      BYTES_TO_T_UINT_8( 0xBC, 0xA9, 0xEE, 0xA1, 0xDB, 0x57, 0xFB, 0xA9 ),
  };
  #endif /* MBEDTLS_ECP_DP_BP256R1_ENABLED */
  
  /*
   * Domain parameters for brainpoolP384r1 (RFC 5639 3.6)
   */
  #if defined(MBEDTLS_ECP_DP_BP384R1_ENABLED)
  static const mbedtls_mpi_uint brainpoolP384r1_p[] = {
      BYTES_TO_T_UINT_8( 0x53, 0xEC, 0x07, 0x31, 0x13, 0x00, 0x47, 0x87 ),
      BYTES_TO_T_UINT_8( 0x71, 0x1A, 0x1D, 0x90, 0x29, 0xA7, 0xD3, 0xAC ),
      BYTES_TO_T_UINT_8( 0x23, 0x11, 0xB7, 0x7F, 0x19, 0xDA, 0xB1, 0x12 ),
      BYTES_TO_T_UINT_8( 0xB4, 0x56, 0x54, 0xED, 0x09, 0x71, 0x2F, 0x15 ),
      BYTES_TO_T_UINT_8( 0xDF, 0x41, 0xE6, 0x50, 0x7E, 0x6F, 0x5D, 0x0F ),
      BYTES_TO_T_UINT_8( 0x28, 0x6D, 0x38, 0xA3, 0x82, 0x1E, 0xB9, 0x8C ),
  };
  static const mbedtls_mpi_uint brainpoolP384r1_a[] = {
      BYTES_TO_T_UINT_8( 0x26, 0x28, 0xCE, 0x22, 0xDD, 0xC7, 0xA8, 0x04 ),
      BYTES_TO_T_UINT_8( 0xEB, 0xD4, 0x3A, 0x50, 0x4A, 0x81, 0xA5, 0x8A ),
      BYTES_TO_T_UINT_8( 0x0F, 0xF9, 0x91, 0xBA, 0xEF, 0x65, 0x91, 0x13 ),
      BYTES_TO_T_UINT_8( 0x87, 0x27, 0xB2, 0x4F, 0x8E, 0xA2, 0xBE, 0xC2 ),
      BYTES_TO_T_UINT_8( 0xA0, 0xAF, 0x05, 0xCE, 0x0A, 0x08, 0x72, 0x3C ),
      BYTES_TO_T_UINT_8( 0x0C, 0x15, 0x8C, 0x3D, 0xC6, 0x82, 0xC3, 0x7B ),
  };
  static const mbedtls_mpi_uint brainpoolP384r1_b[] = {
      BYTES_TO_T_UINT_8( 0x11, 0x4C, 0x50, 0xFA, 0x96, 0x86, 0xB7, 0x3A ),
      BYTES_TO_T_UINT_8( 0x94, 0xC9, 0xDB, 0x95, 0x02, 0x39, 0xB4, 0x7C ),
      BYTES_TO_T_UINT_8( 0xD5, 0x62, 0xEB, 0x3E, 0xA5, 0x0E, 0x88, 0x2E ),
      BYTES_TO_T_UINT_8( 0xA6, 0xD2, 0xDC, 0x07, 0xE1, 0x7D, 0xB7, 0x2F ),
      BYTES_TO_T_UINT_8( 0x7C, 0x44, 0xF0, 0x16, 0x54, 0xB5, 0x39, 0x8B ),
      BYTES_TO_T_UINT_8( 0x26, 0x28, 0xCE, 0x22, 0xDD, 0xC7, 0xA8, 0x04 ),
  };
  static const mbedtls_mpi_uint brainpoolP384r1_gx[] = {
      BYTES_TO_T_UINT_8( 0x1E, 0xAF, 0xD4, 0x47, 0xE2, 0xB2, 0x87, 0xEF ),
      BYTES_TO_T_UINT_8( 0xAA, 0x46, 0xD6, 0x36, 0x34, 0xE0, 0x26, 0xE8 ),
      BYTES_TO_T_UINT_8( 0xE8, 0x10, 0xBD, 0x0C, 0xFE, 0xCA, 0x7F, 0xDB ),
      BYTES_TO_T_UINT_8( 0xE3, 0x4F, 0xF1, 0x7E, 0xE7, 0xA3, 0x47, 0x88 ),
      BYTES_TO_T_UINT_8( 0x6B, 0x3F, 0xC1, 0xB7, 0x81, 0x3A, 0xA6, 0xA2 ),
      BYTES_TO_T_UINT_8( 0xFF, 0x45, 0xCF, 0x68, 0xF0, 0x64, 0x1C, 0x1D ),
  };
  static const mbedtls_mpi_uint brainpoolP384r1_gy[] = {
      BYTES_TO_T_UINT_8( 0x15, 0x53, 0x3C, 0x26, 0x41, 0x03, 0x82, 0x42 ),
      BYTES_TO_T_UINT_8( 0x11, 0x81, 0x91, 0x77, 0x21, 0x46, 0x46, 0x0E ),
      BYTES_TO_T_UINT_8( 0x28, 0x29, 0x91, 0xF9, 0x4F, 0x05, 0x9C, 0xE1 ),
      BYTES_TO_T_UINT_8( 0x64, 0x58, 0xEC, 0xFE, 0x29, 0x0B, 0xB7, 0x62 ),
      BYTES_TO_T_UINT_8( 0x52, 0xD5, 0xCF, 0x95, 0x8E, 0xEB, 0xB1, 0x5C ),
      BYTES_TO_T_UINT_8( 0xA4, 0xC2, 0xF9, 0x20, 0x75, 0x1D, 0xBE, 0x8A ),
  };
  static const mbedtls_mpi_uint brainpoolP384r1_n[] = {
      BYTES_TO_T_UINT_8( 0x65, 0x65, 0x04, 0xE9, 0x02, 0x32, 0x88, 0x3B ),
      BYTES_TO_T_UINT_8( 0x10, 0xC3, 0x7F, 0x6B, 0xAF, 0xB6, 0x3A, 0xCF ),
      BYTES_TO_T_UINT_8( 0xA7, 0x25, 0x04, 0xAC, 0x6C, 0x6E, 0x16, 0x1F ),
      BYTES_TO_T_UINT_8( 0xB3, 0x56, 0x54, 0xED, 0x09, 0x71, 0x2F, 0x15 ),
      BYTES_TO_T_UINT_8( 0xDF, 0x41, 0xE6, 0x50, 0x7E, 0x6F, 0x5D, 0x0F ),
      BYTES_TO_T_UINT_8( 0x28, 0x6D, 0x38, 0xA3, 0x82, 0x1E, 0xB9, 0x8C ),
  };
  #endif /* MBEDTLS_ECP_DP_BP384R1_ENABLED */
  
  /*
   * Domain parameters for brainpoolP512r1 (RFC 5639 3.7)
   */
  #if defined(MBEDTLS_ECP_DP_BP512R1_ENABLED)
  static const mbedtls_mpi_uint brainpoolP512r1_p[] = {
      BYTES_TO_T_UINT_8( 0xF3, 0x48, 0x3A, 0x58, 0x56, 0x60, 0xAA, 0x28 ),
      BYTES_TO_T_UINT_8( 0x85, 0xC6, 0x82, 0x2D, 0x2F, 0xFF, 0x81, 0x28 ),
      BYTES_TO_T_UINT_8( 0xE6, 0x80, 0xA3, 0xE6, 0x2A, 0xA1, 0xCD, 0xAE ),
      BYTES_TO_T_UINT_8( 0x42, 0x68, 0xC6, 0x9B, 0x00, 0x9B, 0x4D, 0x7D ),
      BYTES_TO_T_UINT_8( 0x71, 0x08, 0x33, 0x70, 0xCA, 0x9C, 0x63, 0xD6 ),
      BYTES_TO_T_UINT_8( 0x0E, 0xD2, 0xC9, 0xB3, 0xB3, 0x8D, 0x30, 0xCB ),
      BYTES_TO_T_UINT_8( 0x07, 0xFC, 0xC9, 0x33, 0xAE, 0xE6, 0xD4, 0x3F ),
      BYTES_TO_T_UINT_8( 0x8B, 0xC4, 0xE9, 0xDB, 0xB8, 0x9D, 0xDD, 0xAA ),
  };
  static const mbedtls_mpi_uint brainpoolP512r1_a[] = {
      BYTES_TO_T_UINT_8( 0xCA, 0x94, 0xFC, 0x77, 0x4D, 0xAC, 0xC1, 0xE7 ),
      BYTES_TO_T_UINT_8( 0xB9, 0xC7, 0xF2, 0x2B, 0xA7, 0x17, 0x11, 0x7F ),
      BYTES_TO_T_UINT_8( 0xB5, 0xC8, 0x9A, 0x8B, 0xC9, 0xF1, 0x2E, 0x0A ),
      BYTES_TO_T_UINT_8( 0xA1, 0x3A, 0x25, 0xA8, 0x5A, 0x5D, 0xED, 0x2D ),
      BYTES_TO_T_UINT_8( 0xBC, 0x63, 0x98, 0xEA, 0xCA, 0x41, 0x34, 0xA8 ),
      BYTES_TO_T_UINT_8( 0x10, 0x16, 0xF9, 0x3D, 0x8D, 0xDD, 0xCB, 0x94 ),
      BYTES_TO_T_UINT_8( 0xC5, 0x4C, 0x23, 0xAC, 0x45, 0x71, 0x32, 0xE2 ),
      BYTES_TO_T_UINT_8( 0x89, 0x3B, 0x60, 0x8B, 0x31, 0xA3, 0x30, 0x78 ),
  };
  static const mbedtls_mpi_uint brainpoolP512r1_b[] = {
      BYTES_TO_T_UINT_8( 0x23, 0xF7, 0x16, 0x80, 0x63, 0xBD, 0x09, 0x28 ),
      BYTES_TO_T_UINT_8( 0xDD, 0xE5, 0xBA, 0x5E, 0xB7, 0x50, 0x40, 0x98 ),
      BYTES_TO_T_UINT_8( 0x67, 0x3E, 0x08, 0xDC, 0xCA, 0x94, 0xFC, 0x77 ),
      BYTES_TO_T_UINT_8( 0x4D, 0xAC, 0xC1, 0xE7, 0xB9, 0xC7, 0xF2, 0x2B ),
      BYTES_TO_T_UINT_8( 0xA7, 0x17, 0x11, 0x7F, 0xB5, 0xC8, 0x9A, 0x8B ),
      BYTES_TO_T_UINT_8( 0xC9, 0xF1, 0x2E, 0x0A, 0xA1, 0x3A, 0x25, 0xA8 ),
      BYTES_TO_T_UINT_8( 0x5A, 0x5D, 0xED, 0x2D, 0xBC, 0x63, 0x98, 0xEA ),
      BYTES_TO_T_UINT_8( 0xCA, 0x41, 0x34, 0xA8, 0x10, 0x16, 0xF9, 0x3D ),
  };
  static const mbedtls_mpi_uint brainpoolP512r1_gx[] = {
      BYTES_TO_T_UINT_8( 0x22, 0xF8, 0xB9, 0xBC, 0x09, 0x22, 0x35, 0x8B ),
      BYTES_TO_T_UINT_8( 0x68, 0x5E, 0x6A, 0x40, 0x47, 0x50, 0x6D, 0x7C ),
      BYTES_TO_T_UINT_8( 0x5F, 0x7D, 0xB9, 0x93, 0x7B, 0x68, 0xD1, 0x50 ),
      BYTES_TO_T_UINT_8( 0x8D, 0xD4, 0xD0, 0xE2, 0x78, 0x1F, 0x3B, 0xFF ),
      BYTES_TO_T_UINT_8( 0x8E, 0x09, 0xD0, 0xF4, 0xEE, 0x62, 0x3B, 0xB4 ),
      BYTES_TO_T_UINT_8( 0xC1, 0x16, 0xD9, 0xB5, 0x70, 0x9F, 0xED, 0x85 ),
      BYTES_TO_T_UINT_8( 0x93, 0x6A, 0x4C, 0x9C, 0x2E, 0x32, 0x21, 0x5A ),
      BYTES_TO_T_UINT_8( 0x64, 0xD9, 0x2E, 0xD8, 0xBD, 0xE4, 0xAE, 0x81 ),
  };
  static const mbedtls_mpi_uint brainpoolP512r1_gy[] = {
      BYTES_TO_T_UINT_8( 0x92, 0x08, 0xD8, 0x3A, 0x0F, 0x1E, 0xCD, 0x78 ),
      BYTES_TO_T_UINT_8( 0x06, 0x54, 0xF0, 0xA8, 0x2F, 0x2B, 0xCA, 0xD1 ),
      BYTES_TO_T_UINT_8( 0xAE, 0x63, 0x27, 0x8A, 0xD8, 0x4B, 0xCA, 0x5B ),
      BYTES_TO_T_UINT_8( 0x5E, 0x48, 0x5F, 0x4A, 0x49, 0xDE, 0xDC, 0xB2 ),
      BYTES_TO_T_UINT_8( 0x11, 0x81, 0x1F, 0x88, 0x5B, 0xC5, 0x00, 0xA0 ),
      BYTES_TO_T_UINT_8( 0x1A, 0x7B, 0xA5, 0x24, 0x00, 0xF7, 0x09, 0xF2 ),
      BYTES_TO_T_UINT_8( 0xFD, 0x22, 0x78, 0xCF, 0xA9, 0xBF, 0xEA, 0xC0 ),
      BYTES_TO_T_UINT_8( 0xEC, 0x32, 0x63, 0x56, 0x5D, 0x38, 0xDE, 0x7D ),
  };
  static const mbedtls_mpi_uint brainpoolP512r1_n[] = {
      BYTES_TO_T_UINT_8( 0x69, 0x00, 0xA9, 0x9C, 0x82, 0x96, 0x87, 0xB5 ),
      BYTES_TO_T_UINT_8( 0xDD, 0xDA, 0x5D, 0x08, 0x81, 0xD3, 0xB1, 0x1D ),
      BYTES_TO_T_UINT_8( 0x47, 0x10, 0xAC, 0x7F, 0x19, 0x61, 0x86, 0x41 ),
      BYTES_TO_T_UINT_8( 0x19, 0x26, 0xA9, 0x4C, 0x41, 0x5C, 0x3E, 0x55 ),
      BYTES_TO_T_UINT_8( 0x70, 0x08, 0x33, 0x70, 0xCA, 0x9C, 0x63, 0xD6 ),
      BYTES_TO_T_UINT_8( 0x0E, 0xD2, 0xC9, 0xB3, 0xB3, 0x8D, 0x30, 0xCB ),
      BYTES_TO_T_UINT_8( 0x07, 0xFC, 0xC9, 0x33, 0xAE, 0xE6, 0xD4, 0x3F ),
      BYTES_TO_T_UINT_8( 0x8B, 0xC4, 0xE9, 0xDB, 0xB8, 0x9D, 0xDD, 0xAA ),
  };
  #endif /* MBEDTLS_ECP_DP_BP512R1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED) ||   \
      defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED) ||   \
      defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) ||   \
      defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) ||   \
      defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED) ||   \
      defined(MBEDTLS_ECP_DP_BP256R1_ENABLED)   ||   \
      defined(MBEDTLS_ECP_DP_BP384R1_ENABLED)   ||   \
      defined(MBEDTLS_ECP_DP_BP512R1_ENABLED)   ||   \
      defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED) ||   \
      defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED) ||   \
      defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED)
  /* For these curves, we build the group parameters dynamically. */
  #define ECP_LOAD_GROUP
  #endif
  
  #if defined(ECP_LOAD_GROUP)
  /*
   * Create an MPI from embedded constants
   * (assumes len is an exact multiple of sizeof mbedtls_mpi_uint)
   */
  static inline void ecp_mpi_load( mbedtls_mpi *X, const mbedtls_mpi_uint *p, size_t len )
  {
      X->s = 1;
      X->n = len / sizeof( mbedtls_mpi_uint );
      X->p = (mbedtls_mpi_uint *) p;
  }
  
  /*
   * Set an MPI to static value 1
   */
  static inline void ecp_mpi_set1( mbedtls_mpi *X )
  {
      static mbedtls_mpi_uint one[] = { 1 };
      X->s = 1;
      X->n = 1;
      X->p = one;
  }
  
  /*
   * Make group available from embedded constants
   */
  static int ecp_group_load( mbedtls_ecp_group *grp,
                             const mbedtls_mpi_uint *p,  size_t plen,
                             const mbedtls_mpi_uint *a,  size_t alen,
                             const mbedtls_mpi_uint *b,  size_t blen,
                             const mbedtls_mpi_uint *gx, size_t gxlen,
                             const mbedtls_mpi_uint *gy, size_t gylen,
                             const mbedtls_mpi_uint *n,  size_t nlen)
  {
      ecp_mpi_load( &grp->P, p, plen );
      if( a != NULL )
          ecp_mpi_load( &grp->A, a, alen );
      ecp_mpi_load( &grp->B, b, blen );
      ecp_mpi_load( &grp->N, n, nlen );
  
      ecp_mpi_load( &grp->G.X, gx, gxlen );
      ecp_mpi_load( &grp->G.Y, gy, gylen );
      ecp_mpi_set1( &grp->G.Z );
  
      grp->pbits = mbedtls_mpi_bitlen( &grp->P );
      grp->nbits = mbedtls_mpi_bitlen( &grp->N );
  
      grp->h = 1;
  
      return( 0 );
  }
  #endif /* ECP_LOAD_GROUP */
  
  #if defined(MBEDTLS_ECP_NIST_OPTIM)
  /* Forward declarations */
  #if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED)
  static int ecp_mod_p192( mbedtls_mpi * );
  #endif
  #if defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED)
  static int ecp_mod_p224( mbedtls_mpi * );
  #endif
  #if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
  static int ecp_mod_p256( mbedtls_mpi * );
  #endif
  #if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
  static int ecp_mod_p384( mbedtls_mpi * );
  #endif
  #if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED)
  static int ecp_mod_p521( mbedtls_mpi * );
  #endif
  
  #define NIST_MODP( P )      grp->modp = ecp_mod_ ## P;
  #else
  #define NIST_MODP( P )
  #endif /* MBEDTLS_ECP_NIST_OPTIM */
  
  /* Additional forward declarations */
  #if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED)
  static int ecp_mod_p255( mbedtls_mpi * );
  #endif
  #if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
  static int ecp_mod_p448( mbedtls_mpi * );
  #endif
  #if defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED)
  static int ecp_mod_p192k1( mbedtls_mpi * );
  #endif
  #if defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED)
  static int ecp_mod_p224k1( mbedtls_mpi * );
  #endif
  #if defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED)
  static int ecp_mod_p256k1( mbedtls_mpi * );
  #endif
  
  #if defined(ECP_LOAD_GROUP)
  #define LOAD_GROUP_A( G )   ecp_group_load( grp,            \
                              G ## _p,  sizeof( G ## _p  ),   \
                              G ## _a,  sizeof( G ## _a  ),   \
                              G ## _b,  sizeof( G ## _b  ),   \
                              G ## _gx, sizeof( G ## _gx ),   \
                              G ## _gy, sizeof( G ## _gy ),   \
                              G ## _n,  sizeof( G ## _n  ) )
  
  #define LOAD_GROUP( G )     ecp_group_load( grp,            \
                              G ## _p,  sizeof( G ## _p  ),   \
                              NULL,     0,                    \
                              G ## _b,  sizeof( G ## _b  ),   \
                              G ## _gx, sizeof( G ## _gx ),   \
                              G ## _gy, sizeof( G ## _gy ),   \
                              G ## _n,  sizeof( G ## _n  ) )
  #endif /* ECP_LOAD_GROUP */
  
  #if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED)
  /*
   * Specialized function for creating the Curve25519 group
   */
  static int ecp_use_curve25519( mbedtls_ecp_group *grp )
  {
      int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
  
      /* Actually ( A + 2 ) / 4 */
      MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &grp->A, 16, "01DB42" ) );
  
      /* P = 2^255 - 19 */
      MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &grp->P, 1 ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_shift_l( &grp->P, 255 ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &grp->P, &grp->P, 19 ) );
      grp->pbits = mbedtls_mpi_bitlen( &grp->P );
  
      /* N = 2^252 + 27742317777372353535851937790883648493 */
      MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &grp->N, 16,
                                                "14DEF9DEA2F79CD65812631A5CF5D3ED" ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_set_bit( &grp->N, 252, 1 ) );
  
      /* Y intentionally not set, since we use x/z coordinates.
       * This is used as a marker to identify Montgomery curves! */
      MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &grp->G.X, 9 ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &grp->G.Z, 1 ) );
      mbedtls_mpi_free( &grp->G.Y );
  
      /* Actually, the required msb for private keys */
      grp->nbits = 254;
  
  cleanup:
      if( ret != 0 )
          mbedtls_ecp_group_free( grp );
  
      return( ret );
  }
  #endif /* MBEDTLS_ECP_DP_CURVE25519_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
  /*
   * Specialized function for creating the Curve448 group
   */
  static int ecp_use_curve448( mbedtls_ecp_group *grp )
  {
      mbedtls_mpi Ns;
      int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
  
      mbedtls_mpi_init( &Ns );
  
      /* Actually ( A + 2 ) / 4 */
      MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &grp->A, 16, "98AA" ) );
  
      /* P = 2^448 - 2^224 - 1 */
      MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &grp->P, 1 ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_shift_l( &grp->P, 224 ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &grp->P, &grp->P, 1 ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_shift_l( &grp->P, 224 ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &grp->P, &grp->P, 1 ) );
      grp->pbits = mbedtls_mpi_bitlen( &grp->P );
  
      /* Y intentionally not set, since we use x/z coordinates.
       * This is used as a marker to identify Montgomery curves! */
      MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &grp->G.X, 5 ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &grp->G.Z, 1 ) );
      mbedtls_mpi_free( &grp->G.Y );
  
      /* N = 2^446 - 13818066809895115352007386748515426880336692474882178609894547503885 */
      MBEDTLS_MPI_CHK( mbedtls_mpi_set_bit( &grp->N, 446, 1 ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &Ns, 16,
                                                "8335DC163BB124B65129C96FDE933D8D723A70AADC873D6D54A7BB0D" ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_sub_mpi( &grp->N, &grp->N, &Ns ) );
  
      /* Actually, the required msb for private keys */
      grp->nbits = 447;
  
  cleanup:
      mbedtls_mpi_free( &Ns );
      if( ret != 0 )
          mbedtls_ecp_group_free( grp );
  
      return( ret );
  }
  #endif /* MBEDTLS_ECP_DP_CURVE448_ENABLED */
  
  /*
   * Set a group using well-known domain parameters
   */
  /*
   * NXP: Our HW implementation requires the entire group to be loaded using LOAD_GROUP_A macro.
   */
  int mbedtls_ecp_group_load( mbedtls_ecp_group *grp, mbedtls_ecp_group_id id )
  {
      ECP_VALIDATE_RET( grp != NULL );
      mbedtls_ecp_group_free( grp );
  
      grp->id = id;
  
      switch( id )
      {
  #if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED)
          case MBEDTLS_ECP_DP_SECP192R1:
              NIST_MODP( p192 );
              return( LOAD_GROUP_A( secp192r1 ) );
  #endif /* MBEDTLS_ECP_DP_SECP192R1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED)
          case MBEDTLS_ECP_DP_SECP224R1:
              NIST_MODP( p224 );
              return( LOAD_GROUP_A( secp224r1 ) );
  #endif /* MBEDTLS_ECP_DP_SECP224R1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
          case MBEDTLS_ECP_DP_SECP256R1:
              NIST_MODP( p256 );
              return( LOAD_GROUP_A( secp256r1 ) );
  #endif /* MBEDTLS_ECP_DP_SECP256R1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
          case MBEDTLS_ECP_DP_SECP384R1:
              NIST_MODP( p384 );
              return( LOAD_GROUP_A( secp384r1 ) );
  #endif /* MBEDTLS_ECP_DP_SECP384R1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED)
          case MBEDTLS_ECP_DP_SECP521R1:
              NIST_MODP( p521 );
              return( LOAD_GROUP_A( secp521r1 ) );
  #endif /* MBEDTLS_ECP_DP_SECP521R1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED)
          case MBEDTLS_ECP_DP_SECP192K1:
              grp->modp = ecp_mod_p192k1;
              return( LOAD_GROUP_A( secp192k1 ) );
  #endif /* MBEDTLS_ECP_DP_SECP192K1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED)
          case MBEDTLS_ECP_DP_SECP224K1:
              grp->modp = ecp_mod_p224k1;
              return( LOAD_GROUP_A( secp224k1 ) );
  #endif /* MBEDTLS_ECP_DP_SECP224K1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED)
          case MBEDTLS_ECP_DP_SECP256K1:
              grp->modp = ecp_mod_p256k1;
              return( LOAD_GROUP_A( secp256k1 ) );
  #endif /* MBEDTLS_ECP_DP_SECP256K1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_BP256R1_ENABLED)
          case MBEDTLS_ECP_DP_BP256R1:
              return( LOAD_GROUP_A( brainpoolP256r1 ) );
  #endif /* MBEDTLS_ECP_DP_BP256R1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_BP384R1_ENABLED)
          case MBEDTLS_ECP_DP_BP384R1:
              return( LOAD_GROUP_A( brainpoolP384r1 ) );
  #endif /* MBEDTLS_ECP_DP_BP384R1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_BP512R1_ENABLED)
          case MBEDTLS_ECP_DP_BP512R1:
              return( LOAD_GROUP_A( brainpoolP512r1 ) );
  #endif /* MBEDTLS_ECP_DP_BP512R1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED)
          case MBEDTLS_ECP_DP_CURVE25519:
              grp->modp = ecp_mod_p255;
              return( ecp_use_curve25519( grp ) );
  #endif /* MBEDTLS_ECP_DP_CURVE25519_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
          case MBEDTLS_ECP_DP_CURVE448:
              grp->modp = ecp_mod_p448;
              return( ecp_use_curve448( grp ) );
  #endif /* MBEDTLS_ECP_DP_CURVE448_ENABLED */
  
          default:
              grp->id = MBEDTLS_ECP_DP_NONE;
              return( MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE );
      }
  }
  
  #if defined(MBEDTLS_ECP_NIST_OPTIM)
  /*
   * Fast reduction modulo the primes used by the NIST curves.
   *
   * These functions are critical for speed, but not needed for correct
   * operations. So, we make the choice to heavily rely on the internals of our
   * bignum library, which creates a tight coupling between these functions and
   * our MPI implementation.  However, the coupling between the ECP module and
   * MPI remains loose, since these functions can be deactivated at will.
   */
  
  #if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED)
  /*
   * Compared to the way things are presented in FIPS 186-3 D.2,
   * we proceed in columns, from right (least significant chunk) to left,
   * adding chunks to N in place, and keeping a carry for the next chunk.
   * This avoids moving things around in memory, and uselessly adding zeros,
   * compared to the more straightforward, line-oriented approach.
   *
   * For this prime we need to handle data in chunks of 64 bits.
   * Since this is always a multiple of our basic mbedtls_mpi_uint, we can
   * use a mbedtls_mpi_uint * to designate such a chunk, and small loops to handle it.
   */
  
  /* Add 64-bit chunks (dst += src) and update carry */
  static inline void add64( mbedtls_mpi_uint *dst, mbedtls_mpi_uint *src, mbedtls_mpi_uint *carry )
  {
      unsigned char i;
      mbedtls_mpi_uint c = 0;
      for( i = 0; i < 8 / sizeof( mbedtls_mpi_uint ); i++, dst++, src++ )
      {
          *dst += c;      c  = ( *dst < c );
          *dst += *src;   c += ( *dst < *src );
      }
      *carry += c;
  }
  
  /* Add carry to a 64-bit chunk and update carry */
  static inline void carry64( mbedtls_mpi_uint *dst, mbedtls_mpi_uint *carry )
  {
      unsigned char i;
      for( i = 0; i < 8 / sizeof( mbedtls_mpi_uint ); i++, dst++ )
      {
          *dst += *carry;
          *carry  = ( *dst < *carry );
      }
  }
  
  #define WIDTH       8 / sizeof( mbedtls_mpi_uint )
  #define A( i )      N->p + (i) * WIDTH
  #define ADD( i )    add64( p, A( i ), &c )
  #define NEXT        p += WIDTH; carry64( p, &c )
  #define LAST        p += WIDTH; *p = c; while( ++p < end ) *p = 0
  
  /*
   * Fast quasi-reduction modulo p192 (FIPS 186-3 D.2.1)
   */
  static int ecp_mod_p192( mbedtls_mpi *N )
  {
      int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
      mbedtls_mpi_uint c = 0;
      mbedtls_mpi_uint *p, *end;
  
      /* Make sure we have enough blocks so that A(5) is legal */
      MBEDTLS_MPI_CHK( mbedtls_mpi_grow( N, 6 * WIDTH ) );
  
      p = N->p;
      end = p + N->n;
  
      ADD( 3 ); ADD( 5 );             NEXT; // A0 += A3 + A5
      ADD( 3 ); ADD( 4 ); ADD( 5 );   NEXT; // A1 += A3 + A4 + A5
      ADD( 4 ); ADD( 5 );             LAST; // A2 += A4 + A5
  
  cleanup:
      return( ret );
  }
  
  #undef WIDTH
  #undef A
  #undef ADD
  #undef NEXT
  #undef LAST
  #endif /* MBEDTLS_ECP_DP_SECP192R1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED) ||   \
      defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) ||   \
      defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
  /*
   * The reader is advised to first understand ecp_mod_p192() since the same
   * general structure is used here, but with additional complications:
   * (1) chunks of 32 bits, and (2) subtractions.
   */
  
  /*
   * For these primes, we need to handle data in chunks of 32 bits.
   * This makes it more complicated if we use 64 bits limbs in MPI,
   * which prevents us from using a uniform access method as for p192.
   *
   * So, we define a mini abstraction layer to access 32 bit chunks,
   * load them in 'cur' for work, and store them back from 'cur' when done.
   *
   * While at it, also define the size of N in terms of 32-bit chunks.
   */
  #define LOAD32      cur = A( i );
  
  #if defined(MBEDTLS_HAVE_INT32)  /* 32 bit */
  
  #define MAX32       N->n
  #define A( j )      N->p[j]
  #define STORE32     N->p[i] = cur;
  
  #else                               /* 64-bit */
  
  #define MAX32       N->n * 2
  #define A( j ) (j) % 2 ? (uint32_t)( N->p[(j)/2] >> 32 ) : \
                           (uint32_t)( N->p[(j)/2] )
  #define STORE32                                   \
      if( i % 2 ) {                                 \
          N->p[i/2] &= 0x00000000FFFFFFFF;          \
          N->p[i/2] |= ((mbedtls_mpi_uint) cur) << 32;        \
      } else {                                      \
          N->p[i/2] &= 0xFFFFFFFF00000000;          \
          N->p[i/2] |= (mbedtls_mpi_uint) cur;                \
      }
  
  #endif /* sizeof( mbedtls_mpi_uint ) */
  
  /*
   * Helpers for addition and subtraction of chunks, with signed carry.
   */
  static inline void add32( uint32_t *dst, uint32_t src, signed char *carry )
  {
      *dst += src;
      *carry += ( *dst < src );
  }
  
  static inline void sub32( uint32_t *dst, uint32_t src, signed char *carry )
  {
      *carry -= ( *dst < src );
      *dst -= src;
  }
  
  #define ADD( j )    add32( &cur, A( j ), &c );
  #define SUB( j )    sub32( &cur, A( j ), &c );
  
  /*
   * Helpers for the main 'loop'
   * (see fix_negative for the motivation of C)
   */
  #define INIT( b )                                                       \
      int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;                                                            \
      signed char c = 0, cc;                                              \
      uint32_t cur;                                                       \
      size_t i = 0, bits = (b);                                           \
      mbedtls_mpi C;                                                      \
      mbedtls_mpi_uint Cp[ (b) / 8 / sizeof( mbedtls_mpi_uint) + 1 ];     \
                                                                          \
      C.s = 1;                                                            \
      C.n = (b) / 8 / sizeof( mbedtls_mpi_uint) + 1;                      \
      C.p = Cp;                                                           \
      memset( Cp, 0, C.n * sizeof( mbedtls_mpi_uint ) );                  \
                                                                          \
      MBEDTLS_MPI_CHK( mbedtls_mpi_grow( N, (b) * 2 / 8 /                 \
                                         sizeof( mbedtls_mpi_uint ) ) );  \
      LOAD32;
  
  #define NEXT                    \
      STORE32; i++; LOAD32;       \
      cc = c; c = 0;              \
      if( cc < 0 )                \
          sub32( &cur, -cc, &c ); \
      else                        \
          add32( &cur, cc, &c );  \
  
  #define LAST                                    \
      STORE32; i++;                               \
      cur = c > 0 ? c : 0; STORE32;               \
      cur = 0; while( ++i < MAX32 ) { STORE32; }  \
      if( c < 0 ) MBEDTLS_MPI_CHK( fix_negative( N, c, &C, bits ) );
  
  /*
   * If the result is negative, we get it in the form
   * c * 2^(bits + 32) + N, with c negative and N positive shorter than 'bits'
   */
  static inline int fix_negative( mbedtls_mpi *N, signed char c, mbedtls_mpi *C, size_t bits )
  {
      int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
  
      /* C = - c * 2^(bits + 32) */
  #if !defined(MBEDTLS_HAVE_INT64)
      ((void) bits);
  #else
      if( bits == 224 )
          C->p[ C->n - 1 ] = ((mbedtls_mpi_uint) -c) << 32;
      else
  #endif
          C->p[ C->n - 1 ] = (mbedtls_mpi_uint) -c;
  
      /* N = - ( C - N ) */
      MBEDTLS_MPI_CHK( mbedtls_mpi_sub_abs( N, C, N ) );
      N->s = -1;
  
  cleanup:
  
      return( ret );
  }
  
  #if defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED)
  /*
   * Fast quasi-reduction modulo p224 (FIPS 186-3 D.2.2)
   */
  static int ecp_mod_p224( mbedtls_mpi *N )
  {
      INIT( 224 );
  
      SUB(  7 ); SUB( 11 );               NEXT; // A0 += -A7 - A11
      SUB(  8 ); SUB( 12 );               NEXT; // A1 += -A8 - A12
      SUB(  9 ); SUB( 13 );               NEXT; // A2 += -A9 - A13
      SUB( 10 ); ADD(  7 ); ADD( 11 );    NEXT; // A3 += -A10 + A7 + A11
      SUB( 11 ); ADD(  8 ); ADD( 12 );    NEXT; // A4 += -A11 + A8 + A12
      SUB( 12 ); ADD(  9 ); ADD( 13 );    NEXT; // A5 += -A12 + A9 + A13
      SUB( 13 ); ADD( 10 );               LAST; // A6 += -A13 + A10
  
  cleanup:
      return( ret );
  }
  #endif /* MBEDTLS_ECP_DP_SECP224R1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
  /*
   * Fast quasi-reduction modulo p256 (FIPS 186-3 D.2.3)
   */
  static int ecp_mod_p256( mbedtls_mpi *N )
  {
      INIT( 256 );
  
      ADD(  8 ); ADD(  9 );
      SUB( 11 ); SUB( 12 ); SUB( 13 ); SUB( 14 );             NEXT; // A0
  
      ADD(  9 ); ADD( 10 );
      SUB( 12 ); SUB( 13 ); SUB( 14 ); SUB( 15 );             NEXT; // A1
  
      ADD( 10 ); ADD( 11 );
      SUB( 13 ); SUB( 14 ); SUB( 15 );                        NEXT; // A2
  
      ADD( 11 ); ADD( 11 ); ADD( 12 ); ADD( 12 ); ADD( 13 );
      SUB( 15 ); SUB(  8 ); SUB(  9 );                        NEXT; // A3
  
      ADD( 12 ); ADD( 12 ); ADD( 13 ); ADD( 13 ); ADD( 14 );
      SUB(  9 ); SUB( 10 );                                   NEXT; // A4
  
      ADD( 13 ); ADD( 13 ); ADD( 14 ); ADD( 14 ); ADD( 15 );
      SUB( 10 ); SUB( 11 );                                   NEXT; // A5
  
      ADD( 14 ); ADD( 14 ); ADD( 15 ); ADD( 15 ); ADD( 14 ); ADD( 13 );
      SUB(  8 ); SUB(  9 );                                   NEXT; // A6
  
      ADD( 15 ); ADD( 15 ); ADD( 15 ); ADD( 8 );
      SUB( 10 ); SUB( 11 ); SUB( 12 ); SUB( 13 );             LAST; // A7
  
  cleanup:
      return( ret );
  }
  #endif /* MBEDTLS_ECP_DP_SECP256R1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
  /*
   * Fast quasi-reduction modulo p384 (FIPS 186-3 D.2.4)
   */
  static int ecp_mod_p384( mbedtls_mpi *N )
  {
      INIT( 384 );
  
      ADD( 12 ); ADD( 21 ); ADD( 20 );
      SUB( 23 );                                              NEXT; // A0
  
      ADD( 13 ); ADD( 22 ); ADD( 23 );
      SUB( 12 ); SUB( 20 );                                   NEXT; // A2
  
      ADD( 14 ); ADD( 23 );
      SUB( 13 ); SUB( 21 );                                   NEXT; // A2
  
      ADD( 15 ); ADD( 12 ); ADD( 20 ); ADD( 21 );
      SUB( 14 ); SUB( 22 ); SUB( 23 );                        NEXT; // A3
  
      ADD( 21 ); ADD( 21 ); ADD( 16 ); ADD( 13 ); ADD( 12 ); ADD( 20 ); ADD( 22 );
      SUB( 15 ); SUB( 23 ); SUB( 23 );                        NEXT; // A4
  
      ADD( 22 ); ADD( 22 ); ADD( 17 ); ADD( 14 ); ADD( 13 ); ADD( 21 ); ADD( 23 );
      SUB( 16 );                                              NEXT; // A5
  
      ADD( 23 ); ADD( 23 ); ADD( 18 ); ADD( 15 ); ADD( 14 ); ADD( 22 );
      SUB( 17 );                                              NEXT; // A6
  
      ADD( 19 ); ADD( 16 ); ADD( 15 ); ADD( 23 );
      SUB( 18 );                                              NEXT; // A7
  
      ADD( 20 ); ADD( 17 ); ADD( 16 );
      SUB( 19 );                                              NEXT; // A8
  
      ADD( 21 ); ADD( 18 ); ADD( 17 );
      SUB( 20 );                                              NEXT; // A9
  
      ADD( 22 ); ADD( 19 ); ADD( 18 );
      SUB( 21 );                                              NEXT; // A10
  
      ADD( 23 ); ADD( 20 ); ADD( 19 );
      SUB( 22 );                                              LAST; // A11
  
  cleanup:
      return( ret );
  }
  #endif /* MBEDTLS_ECP_DP_SECP384R1_ENABLED */
  
  #undef A
  #undef LOAD32
  #undef STORE32
  #undef MAX32
  #undef INIT
  #undef NEXT
  #undef LAST
  
  #endif /* MBEDTLS_ECP_DP_SECP224R1_ENABLED ||
            MBEDTLS_ECP_DP_SECP256R1_ENABLED ||
            MBEDTLS_ECP_DP_SECP384R1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED)
  /*
   * Here we have an actual Mersenne prime, so things are more straightforward.
   * However, chunks are aligned on a 'weird' boundary (521 bits).
   */
  
  /* Size of p521 in terms of mbedtls_mpi_uint */
  #define P521_WIDTH      ( 521 / 8 / sizeof( mbedtls_mpi_uint ) + 1 )
  
  /* Bits to keep in the most significant mbedtls_mpi_uint */
  #define P521_MASK       0x01FF
  
  /*
   * Fast quasi-reduction modulo p521 (FIPS 186-3 D.2.5)
   * Write N as A1 + 2^521 A0, return A0 + A1
   */
  static int ecp_mod_p521( mbedtls_mpi *N )
  {
      int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
      size_t i;
      mbedtls_mpi M;
      mbedtls_mpi_uint Mp[P521_WIDTH + 1];
      /* Worst case for the size of M is when mbedtls_mpi_uint is 16 bits:
       * we need to hold bits 513 to 1056, which is 34 limbs, that is
       * P521_WIDTH + 1. Otherwise P521_WIDTH is enough. */
  
      if( N->n < P521_WIDTH )
          return( 0 );
  
      /* M = A1 */
      M.s = 1;
      M.n = N->n - ( P521_WIDTH - 1 );
      if( M.n > P521_WIDTH + 1 )
          M.n = P521_WIDTH + 1;
      M.p = Mp;
      memcpy( Mp, N->p + P521_WIDTH - 1, M.n * sizeof( mbedtls_mpi_uint ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &M, 521 % ( 8 * sizeof( mbedtls_mpi_uint ) ) ) );
  
      /* N = A0 */
      N->p[P521_WIDTH - 1] &= P521_MASK;
      for( i = P521_WIDTH; i < N->n; i++ )
          N->p[i] = 0;
  
      /* N = A0 + A1 */
      MBEDTLS_MPI_CHK( mbedtls_mpi_add_abs( N, N, &M ) );
  
  cleanup:
      return( ret );
  }
  
  #undef P521_WIDTH
  #undef P521_MASK
  #endif /* MBEDTLS_ECP_DP_SECP521R1_ENABLED */
  
  #endif /* MBEDTLS_ECP_NIST_OPTIM */
  
  #if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED)
  
  /* Size of p255 in terms of mbedtls_mpi_uint */
  #define P255_WIDTH      ( 255 / 8 / sizeof( mbedtls_mpi_uint ) + 1 )
  
  /*
   * Fast quasi-reduction modulo p255 = 2^255 - 19
   * Write N as A0 + 2^255 A1, return A0 + 19 * A1
   */
  static int ecp_mod_p255( mbedtls_mpi *N )
  {
      int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
      size_t i;
      mbedtls_mpi M;
      mbedtls_mpi_uint Mp[P255_WIDTH + 2];
  
      if( N->n < P255_WIDTH )
          return( 0 );
  
      /* M = A1 */
      M.s = 1;
      M.n = N->n - ( P255_WIDTH - 1 );
      if( M.n > P255_WIDTH + 1 )
          return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
      M.p = Mp;
      memset( Mp, 0, sizeof Mp );
      memcpy( Mp, N->p + P255_WIDTH - 1, M.n * sizeof( mbedtls_mpi_uint ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &M, 255 % ( 8 * sizeof( mbedtls_mpi_uint ) ) ) );
      M.n++; /* Make room for multiplication by 19 */
  
      /* N = A0 */
      MBEDTLS_MPI_CHK( mbedtls_mpi_set_bit( N, 255, 0 ) );
      for( i = P255_WIDTH; i < N->n; i++ )
          N->p[i] = 0;
  
      /* N = A0 + 19 * A1 */
      MBEDTLS_MPI_CHK( mbedtls_mpi_mul_int( &M, &M, 19 ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_add_abs( N, N, &M ) );
  
  cleanup:
      return( ret );
  }
  #endif /* MBEDTLS_ECP_DP_CURVE25519_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
  
  /* Size of p448 in terms of mbedtls_mpi_uint */
  #define P448_WIDTH      ( 448 / 8 / sizeof( mbedtls_mpi_uint ) )
  
  /* Number of limbs fully occupied by 2^224 (max), and limbs used by it (min) */
  #define DIV_ROUND_UP( X, Y ) ( ( ( X ) + ( Y ) - 1 ) / ( Y ) )
  #define P224_WIDTH_MIN   ( 28 / sizeof( mbedtls_mpi_uint ) )
  #define P224_WIDTH_MAX   DIV_ROUND_UP( 28, sizeof( mbedtls_mpi_uint ) )
  #define P224_UNUSED_BITS ( ( P224_WIDTH_MAX * sizeof( mbedtls_mpi_uint ) * 8 ) - 224 )
  
  /*
   * Fast quasi-reduction modulo p448 = 2^448 - 2^224 - 1
   * Write N as A0 + 2^448 A1 and A1 as B0 + 2^224 B1, and return
   * A0 + A1 + B1 + (B0 + B1) * 2^224.  This is different to the reference
   * implementation of Curve448, which uses its own special 56-bit limbs rather
   * than a generic bignum library.  We could squeeze some extra speed out on
   * 32-bit machines by splitting N up into 32-bit limbs and doing the
   * arithmetic using the limbs directly as we do for the NIST primes above,
   * but for 64-bit targets it should use half the number of operations if we do
   * the reduction with 224-bit limbs, since mpi_add_mpi will then use 64-bit adds.
   */
  static int ecp_mod_p448( mbedtls_mpi *N )
  {
      int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
      size_t i;
      mbedtls_mpi M, Q;
      mbedtls_mpi_uint Mp[P448_WIDTH + 1], Qp[P448_WIDTH];
  
      if( N->n <= P448_WIDTH )
          return( 0 );
  
      /* M = A1 */
      M.s = 1;
      M.n = N->n - ( P448_WIDTH );
      if( M.n > P448_WIDTH )
          /* Shouldn't be called with N larger than 2^896! */
          return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
      M.p = Mp;
      memset( Mp, 0, sizeof( Mp ) );
      memcpy( Mp, N->p + P448_WIDTH, M.n * sizeof( mbedtls_mpi_uint ) );
  
      /* N = A0 */
      for( i = P448_WIDTH; i < N->n; i++ )
          N->p[i] = 0;
  
      /* N += A1 */
      MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( N, N, &M ) );
  
      /* Q = B1, N += B1 */
      Q = M;
      Q.p = Qp;
      memcpy( Qp, Mp, sizeof( Qp ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &Q, 224 ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( N, N, &Q ) );
  
      /* M = (B0 + B1) * 2^224, N += M */
      if( sizeof( mbedtls_mpi_uint ) > 4 )
          Mp[P224_WIDTH_MIN] &= ( (mbedtls_mpi_uint)-1 ) >> ( P224_UNUSED_BITS );
      for( i = P224_WIDTH_MAX; i < M.n; ++i )
          Mp[i] = 0;
      MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( &M, &M, &Q ) );
      M.n = P448_WIDTH + 1; /* Make room for shifted carry bit from the addition */
      MBEDTLS_MPI_CHK( mbedtls_mpi_shift_l( &M, 224 ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( N, N, &M ) );
  
  cleanup:
      return( ret );
  }
  #endif /* MBEDTLS_ECP_DP_CURVE448_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED) ||   \
      defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED) ||   \
      defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED)
  /*
   * Fast quasi-reduction modulo P = 2^s - R,
   * with R about 33 bits, used by the Koblitz curves.
   *
   * Write N as A0 + 2^224 A1, return A0 + R * A1.
   * Actually do two passes, since R is big.
   */
  #define P_KOBLITZ_MAX   ( 256 / 8 / sizeof( mbedtls_mpi_uint ) )  // Max limbs in P
  #define P_KOBLITZ_R     ( 8 / sizeof( mbedtls_mpi_uint ) )        // Limbs in R
  static inline int ecp_mod_koblitz( mbedtls_mpi *N, mbedtls_mpi_uint *Rp, size_t p_limbs,
                                     size_t adjust, size_t shift, mbedtls_mpi_uint mask )
  {
      int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
      size_t i;
      mbedtls_mpi M, R;
      mbedtls_mpi_uint Mp[P_KOBLITZ_MAX + P_KOBLITZ_R + 1];
  
      if( N->n < p_limbs )
          return( 0 );
  
      /* Init R */
      R.s = 1;
      R.p = Rp;
      R.n = P_KOBLITZ_R;
  
      /* Common setup for M */
      M.s = 1;
      M.p = Mp;
  
      /* M = A1 */
      M.n = N->n - ( p_limbs - adjust );
      if( M.n > p_limbs + adjust )
          M.n = p_limbs + adjust;
      memset( Mp, 0, sizeof Mp );
      memcpy( Mp, N->p + p_limbs - adjust, M.n * sizeof( mbedtls_mpi_uint ) );
      if( shift != 0 )
          MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &M, shift ) );
      M.n += R.n; /* Make room for multiplication by R */
  
      /* N = A0 */
      if( mask != 0 )
          N->p[p_limbs - 1] &= mask;
      for( i = p_limbs; i < N->n; i++ )
          N->p[i] = 0;
  
      /* N = A0 + R * A1 */
      MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &M, &M, &R ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_add_abs( N, N, &M ) );
  
      /* Second pass */
  
      /* M = A1 */
      M.n = N->n - ( p_limbs - adjust );
      if( M.n > p_limbs + adjust )
          M.n = p_limbs + adjust;
      memset( Mp, 0, sizeof Mp );
      memcpy( Mp, N->p + p_limbs - adjust, M.n * sizeof( mbedtls_mpi_uint ) );
      if( shift != 0 )
          MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &M, shift ) );
      M.n += R.n; /* Make room for multiplication by R */
  
      /* N = A0 */
      if( mask != 0 )
          N->p[p_limbs - 1] &= mask;
      for( i = p_limbs; i < N->n; i++ )
          N->p[i] = 0;
  
      /* N = A0 + R * A1 */
      MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &M, &M, &R ) );
      MBEDTLS_MPI_CHK( mbedtls_mpi_add_abs( N, N, &M ) );
  
  cleanup:
      return( ret );
  }
  #endif /* MBEDTLS_ECP_DP_SECP192K1_ENABLED) ||
            MBEDTLS_ECP_DP_SECP224K1_ENABLED) ||
            MBEDTLS_ECP_DP_SECP256K1_ENABLED) */
  
  #if defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED)
  /*
   * Fast quasi-reduction modulo p192k1 = 2^192 - R,
   * with R = 2^32 + 2^12 + 2^8 + 2^7 + 2^6 + 2^3 + 1 = 0x0100001119
   */
  static int ecp_mod_p192k1( mbedtls_mpi *N )
  {
      static mbedtls_mpi_uint Rp[] = {
          BYTES_TO_T_UINT_8( 0xC9, 0x11, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00 ) };
  
      return( ecp_mod_koblitz( N, Rp, 192 / 8 / sizeof( mbedtls_mpi_uint ), 0, 0, 0 ) );
  }
  #endif /* MBEDTLS_ECP_DP_SECP192K1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED)
  /*
   * Fast quasi-reduction modulo p224k1 = 2^224 - R,
   * with R = 2^32 + 2^12 + 2^11 + 2^9 + 2^7 + 2^4 + 2 + 1 = 0x0100001A93
   */
  static int ecp_mod_p224k1( mbedtls_mpi *N )
  {
      static mbedtls_mpi_uint Rp[] = {
          BYTES_TO_T_UINT_8( 0x93, 0x1A, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00 ) };
  
  #if defined(MBEDTLS_HAVE_INT64)
      return( ecp_mod_koblitz( N, Rp, 4, 1, 32, 0xFFFFFFFF ) );
  #else
      return( ecp_mod_koblitz( N, Rp, 224 / 8 / sizeof( mbedtls_mpi_uint ), 0, 0, 0 ) );
  #endif
  }
  
  #endif /* MBEDTLS_ECP_DP_SECP224K1_ENABLED */
  
  #if defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED)
  /*
   * Fast quasi-reduction modulo p256k1 = 2^256 - R,
   * with R = 2^32 + 2^9 + 2^8 + 2^7 + 2^6 + 2^4 + 1 = 0x01000003D1
   */
  static int ecp_mod_p256k1( mbedtls_mpi *N )
  {
      static mbedtls_mpi_uint Rp[] = {
          BYTES_TO_T_UINT_8( 0xD1, 0x03, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00 ) };
      return( ecp_mod_koblitz( N, Rp, 256 / 8 / sizeof( mbedtls_mpi_uint ), 0, 0, 0 ) );
  }
  #endif /* MBEDTLS_ECP_DP_SECP256K1_ENABLED */
  
  #endif /* !MBEDTLS_ECP_ALT */
  
  #endif /* MBEDTLS_ECP_C */
  