text: /**
   * \file cipher_wrap.c
   *
   * \brief Generic cipher wrapper for mbed TLS
   *
   * \author Adriaan de Jong <dejong@fox-it.com>
   *
   *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
   *  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.
   *
   *  This file is part of mbed TLS (https://tls.mbed.org)
   */
  
  #if !defined(MBEDTLS_CONFIG_FILE)
  #include "mbedtls/config.h"
  #else
  #include MBEDTLS_CONFIG_FILE
  #endif
  
  #if defined(MBEDTLS_CIPHER_C)
  
  #include "mbedtls/cipher_internal.h"
  
  #if defined(MBEDTLS_AES_C)
  #include "mbedtls/aes.h"
  #endif
  
  #if defined(MBEDTLS_ARC4_C)
  #include "mbedtls/arc4.h"
  #endif
  
  #if defined(MBEDTLS_SALSA20_C)
  #include "mbedtls/salsa20.h"
  #endif
  
  #if defined(MBEDTLS_CHACHA8_C)
  #include "mbedtls/chacha8.h"
  #endif
  
  #if defined(MBEDTLS_CAMELLIA_C)
  #include "mbedtls/camellia.h"
  #endif
  
  #if defined(MBEDTLS_DES_C)
  #include "mbedtls/des.h"
  #endif
  
  #if defined(MBEDTLS_BLOWFISH_C)
  #include "mbedtls/blowfish.h"
  #endif
  
  #if defined(MBEDTLS_GCM_C)
  #include "mbedtls/gcm.h"
  #endif
  
  #if defined(MBEDTLS_CCM_C)
  #include "mbedtls/ccm.h"
  #endif
  
  #if defined(MBEDTLS_CIPHER_NULL_CIPHER)
  #include <string.h>
  #endif
  
  #if defined(MBEDTLS_PLATFORM_C)
  #include "mbedtls/platform.h"
  #else
  #include <stdlib.h>
  #define mbedtls_calloc    calloc
  #define mbedtls_free       free
  #endif
  
  #if defined(MBEDTLS_GCM_C)
  /* shared by all GCM ciphers */
  static void *gcm_ctx_alloc( void )
  {
      void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_gcm_context ) );
  
      if( ctx != NULL )
          mbedtls_gcm_init( (mbedtls_gcm_context *) ctx );
  
      return( ctx );
  }
  
  static void gcm_ctx_free( void *ctx )
  {
      mbedtls_gcm_free( ctx );
      mbedtls_free( ctx );
  }
  #endif /* MBEDTLS_GCM_C */
  
  #if defined(MBEDTLS_CCM_C)
  /* shared by all CCM ciphers */
  static void *ccm_ctx_alloc( void )
  {
      void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ccm_context ) );
  
      if( ctx != NULL )
          mbedtls_ccm_init( (mbedtls_ccm_context *) ctx );
  
      return( ctx );
  }
  
  static void ccm_ctx_free( void *ctx )
  {
      mbedtls_ccm_free( ctx );
      mbedtls_free( ctx );
  }
  #endif /* MBEDTLS_CCM_C */
  
  #if defined(MBEDTLS_AES_C)
  
  static int aes_crypt_ecb_wrap( void *ctx, mbedtls_operation_t operation,
          const unsigned char *input, unsigned char *output )
  {
      return mbedtls_aes_crypt_ecb( (mbedtls_aes_context *) ctx, operation, input, output );
  }
  
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
  static int aes_crypt_cbc_wrap( void *ctx, mbedtls_operation_t operation, size_t length,
          unsigned char *iv, const unsigned char *input, unsigned char *output )
  {
      return mbedtls_aes_crypt_cbc( (mbedtls_aes_context *) ctx, operation, length, iv, input,
                            output );
  }
  #endif /* MBEDTLS_CIPHER_MODE_CBC */
  
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
  static int aes_crypt_cfb128_wrap( void *ctx, mbedtls_operation_t operation,
          size_t length, size_t *iv_off, unsigned char *iv,
          const unsigned char *input, unsigned char *output )
  {
      return mbedtls_aes_crypt_cfb128( (mbedtls_aes_context *) ctx, operation, length, iv_off, iv,
                               input, output );
  }
  #endif /* MBEDTLS_CIPHER_MODE_CFB */
  
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
  static int aes_crypt_ctr_wrap( void *ctx, size_t length, size_t *nc_off,
          unsigned char *nonce_counter, unsigned char *stream_block,
          const unsigned char *input, unsigned char *output )
  {
      return mbedtls_aes_crypt_ctr( (mbedtls_aes_context *) ctx, length, nc_off, nonce_counter,
                            stream_block, input, output );
  }
  #endif /* MBEDTLS_CIPHER_MODE_CTR */
  
  static int aes_setkey_dec_wrap( void *ctx, const unsigned char *key,
                                  unsigned int key_bitlen )
  {
      return mbedtls_aes_setkey_dec( (mbedtls_aes_context *) ctx, key, key_bitlen );
  }
  
  static int aes_setkey_enc_wrap( void *ctx, const unsigned char *key,
                                  unsigned int key_bitlen )
  {
      return mbedtls_aes_setkey_enc( (mbedtls_aes_context *) ctx, key, key_bitlen );
  }
  
  static void * aes_ctx_alloc( void )
  {
      mbedtls_aes_context *aes = mbedtls_calloc( 1, sizeof( mbedtls_aes_context ) );
  
      if( aes == NULL )
          return( NULL );
  
      mbedtls_aes_init( aes );
  
      return( aes );
  }
  
  static void aes_ctx_free( void *ctx )
  {
      mbedtls_aes_free( (mbedtls_aes_context *) ctx );
      mbedtls_free( ctx );
  }
  
  static const mbedtls_cipher_base_t aes_info = {
      MBEDTLS_CIPHER_ID_AES,
      aes_crypt_ecb_wrap,
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      aes_crypt_cbc_wrap,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      aes_crypt_cfb128_wrap,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      aes_crypt_ctr_wrap,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_STREAM)
      NULL,
  #endif
      aes_setkey_enc_wrap,
      aes_setkey_dec_wrap,
      aes_ctx_alloc,
      aes_ctx_free
  #if defined(MBEDTLS_CIPHER_MODE_STREAM) && (defined(MBEDTLS_SALSA20_C) || defined(MBEDTLS_CHACHA8_C))
      , NULL
  #endif
  };
  
  static const mbedtls_cipher_info_t aes_128_ecb_info = {
      MBEDTLS_CIPHER_AES_128_ECB,
      MBEDTLS_MODE_ECB,
      128,
      "AES-128-ECB",
      16,
      0,
      16,
      &aes_info
  };
  
  static const mbedtls_cipher_info_t aes_192_ecb_info = {
      MBEDTLS_CIPHER_AES_192_ECB,
      MBEDTLS_MODE_ECB,
      192,
      "AES-192-ECB",
      16,
      0,
      16,
      &aes_info
  };
  
  static const mbedtls_cipher_info_t aes_256_ecb_info = {
      MBEDTLS_CIPHER_AES_256_ECB,
      MBEDTLS_MODE_ECB,
      256,
      "AES-256-ECB",
      16,
      0,
      16,
      &aes_info
  };
  
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
  static const mbedtls_cipher_info_t aes_128_cbc_info = {
      MBEDTLS_CIPHER_AES_128_CBC,
      MBEDTLS_MODE_CBC,
      128,
      "AES-128-CBC",
      16,
      0,
      16,
      &aes_info
  };
  
  static const mbedtls_cipher_info_t aes_192_cbc_info = {
      MBEDTLS_CIPHER_AES_192_CBC,
      MBEDTLS_MODE_CBC,
      192,
      "AES-192-CBC",
      16,
      0,
      16,
      &aes_info
  };
  
  static const mbedtls_cipher_info_t aes_256_cbc_info = {
      MBEDTLS_CIPHER_AES_256_CBC,
      MBEDTLS_MODE_CBC,
      256,
      "AES-256-CBC",
      16,
      0,
      16,
      &aes_info
  };
  #endif /* MBEDTLS_CIPHER_MODE_CBC */
  
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
  static const mbedtls_cipher_info_t aes_128_cfb128_info = {
      MBEDTLS_CIPHER_AES_128_CFB128,
      MBEDTLS_MODE_CFB,
      128,
      "AES-128-CFB128",
      16,
      0,
      16,
      &aes_info
  };
  
  static const mbedtls_cipher_info_t aes_192_cfb128_info = {
      MBEDTLS_CIPHER_AES_192_CFB128,
      MBEDTLS_MODE_CFB,
      192,
      "AES-192-CFB128",
      16,
      0,
      16,
      &aes_info
  };
  
  static const mbedtls_cipher_info_t aes_256_cfb128_info = {
      MBEDTLS_CIPHER_AES_256_CFB128,
      MBEDTLS_MODE_CFB,
      256,
      "AES-256-CFB128",
      16,
      0,
      16,
      &aes_info
  };
  #endif /* MBEDTLS_CIPHER_MODE_CFB */
  
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
  static const mbedtls_cipher_info_t aes_128_ctr_info = {
      MBEDTLS_CIPHER_AES_128_CTR,
      MBEDTLS_MODE_CTR,
      128,
      "AES-128-CTR",
      16,
      0,
      16,
      &aes_info
  };
  
  static const mbedtls_cipher_info_t aes_192_ctr_info = {
      MBEDTLS_CIPHER_AES_192_CTR,
      MBEDTLS_MODE_CTR,
      192,
      "AES-192-CTR",
      16,
      0,
      16,
      &aes_info
  };
  
  static const mbedtls_cipher_info_t aes_256_ctr_info = {
      MBEDTLS_CIPHER_AES_256_CTR,
      MBEDTLS_MODE_CTR,
      256,
      "AES-256-CTR",
      16,
      0,
      16,
      &aes_info
  };
  #endif /* MBEDTLS_CIPHER_MODE_CTR */
  
  #if defined(MBEDTLS_GCM_C)
  static int gcm_aes_setkey_wrap( void *ctx, const unsigned char *key,
                                  unsigned int key_bitlen )
  {
      return mbedtls_gcm_setkey( (mbedtls_gcm_context *) ctx, MBEDTLS_CIPHER_ID_AES,
                       key, key_bitlen );
  }
  
  static const mbedtls_cipher_base_t gcm_aes_info = {
      MBEDTLS_CIPHER_ID_AES,
      NULL,
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_STREAM)
      NULL,
  #endif
      gcm_aes_setkey_wrap,
      gcm_aes_setkey_wrap,
      gcm_ctx_alloc,
      gcm_ctx_free
  #if defined(MBEDTLS_CIPHER_MODE_STREAM) && (defined(MBEDTLS_SALSA20_C) || defined(MBEDTLS_CHACHA8_C))
      , NULL
  #endif
  };
  
  static const mbedtls_cipher_info_t aes_128_gcm_info = {
      MBEDTLS_CIPHER_AES_128_GCM,
      MBEDTLS_MODE_GCM,
      128,
      "AES-128-GCM",
      12,
      MBEDTLS_CIPHER_VARIABLE_IV_LEN,
      16,
      &gcm_aes_info
  };
  
  static const mbedtls_cipher_info_t aes_192_gcm_info = {
      MBEDTLS_CIPHER_AES_192_GCM,
      MBEDTLS_MODE_GCM,
      192,
      "AES-192-GCM",
      12,
      MBEDTLS_CIPHER_VARIABLE_IV_LEN,
      16,
      &gcm_aes_info
  };
  
  static const mbedtls_cipher_info_t aes_256_gcm_info = {
      MBEDTLS_CIPHER_AES_256_GCM,
      MBEDTLS_MODE_GCM,
      256,
      "AES-256-GCM",
      12,
      MBEDTLS_CIPHER_VARIABLE_IV_LEN,
      16,
      &gcm_aes_info
  };
  #endif /* MBEDTLS_GCM_C */
  
  #if defined(MBEDTLS_CCM_C)
  static int ccm_aes_setkey_wrap( void *ctx, const unsigned char *key,
                                  unsigned int key_bitlen )
  {
      return mbedtls_ccm_setkey( (mbedtls_ccm_context *) ctx, MBEDTLS_CIPHER_ID_AES,
                       key, key_bitlen );
  }
  
  static const mbedtls_cipher_base_t ccm_aes_info = {
      MBEDTLS_CIPHER_ID_AES,
      NULL,
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_STREAM)
      NULL,
  #endif
      ccm_aes_setkey_wrap,
      ccm_aes_setkey_wrap,
      ccm_ctx_alloc,
      ccm_ctx_free
  #if defined(MBEDTLS_CIPHER_MODE_STREAM) && (defined(MBEDTLS_SALSA20_C) || defined(MBEDTLS_CHACHA8_C))
      , NULL
  #endif
  };
  
  static const mbedtls_cipher_info_t aes_128_ccm_info = {
      MBEDTLS_CIPHER_AES_128_CCM,
      MBEDTLS_MODE_CCM,
      128,
      "AES-128-CCM",
      12,
      MBEDTLS_CIPHER_VARIABLE_IV_LEN,
      16,
      &ccm_aes_info
  };
  
  static const mbedtls_cipher_info_t aes_192_ccm_info = {
      MBEDTLS_CIPHER_AES_192_CCM,
      MBEDTLS_MODE_CCM,
      192,
      "AES-192-CCM",
      12,
      MBEDTLS_CIPHER_VARIABLE_IV_LEN,
      16,
      &ccm_aes_info
  };
  
  static const mbedtls_cipher_info_t aes_256_ccm_info = {
      MBEDTLS_CIPHER_AES_256_CCM,
      MBEDTLS_MODE_CCM,
      256,
      "AES-256-CCM",
      12,
      MBEDTLS_CIPHER_VARIABLE_IV_LEN,
      16,
      &ccm_aes_info
  };
  #endif /* MBEDTLS_CCM_C */
  
  #endif /* MBEDTLS_AES_C */
  
  #if defined(MBEDTLS_CAMELLIA_C)
  
  static int camellia_crypt_ecb_wrap( void *ctx, mbedtls_operation_t operation,
          const unsigned char *input, unsigned char *output )
  {
      return mbedtls_camellia_crypt_ecb( (mbedtls_camellia_context *) ctx, operation, input,
                                 output );
  }
  
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
  static int camellia_crypt_cbc_wrap( void *ctx, mbedtls_operation_t operation,
          size_t length, unsigned char *iv,
          const unsigned char *input, unsigned char *output )
  {
      return mbedtls_camellia_crypt_cbc( (mbedtls_camellia_context *) ctx, operation, length, iv,
                                 input, output );
  }
  #endif /* MBEDTLS_CIPHER_MODE_CBC */
  
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
  static int camellia_crypt_cfb128_wrap( void *ctx, mbedtls_operation_t operation,
          size_t length, size_t *iv_off, unsigned char *iv,
          const unsigned char *input, unsigned char *output )
  {
      return mbedtls_camellia_crypt_cfb128( (mbedtls_camellia_context *) ctx, operation, length,
                                    iv_off, iv, input, output );
  }
  #endif /* MBEDTLS_CIPHER_MODE_CFB */
  
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
  static int camellia_crypt_ctr_wrap( void *ctx, size_t length, size_t *nc_off,
          unsigned char *nonce_counter, unsigned char *stream_block,
          const unsigned char *input, unsigned char *output )
  {
      return mbedtls_camellia_crypt_ctr( (mbedtls_camellia_context *) ctx, length, nc_off,
                                 nonce_counter, stream_block, input, output );
  }
  #endif /* MBEDTLS_CIPHER_MODE_CTR */
  
  static int camellia_setkey_dec_wrap( void *ctx, const unsigned char *key,
                                       unsigned int key_bitlen )
  {
      return mbedtls_camellia_setkey_dec( (mbedtls_camellia_context *) ctx, key, key_bitlen );
  }
  
  static int camellia_setkey_enc_wrap( void *ctx, const unsigned char *key,
                                       unsigned int key_bitlen )
  {
      return mbedtls_camellia_setkey_enc( (mbedtls_camellia_context *) ctx, key, key_bitlen );
  }
  
  static void * camellia_ctx_alloc( void )
  {
      mbedtls_camellia_context *ctx;
      ctx = mbedtls_calloc( 1, sizeof( mbedtls_camellia_context ) );
  
      if( ctx == NULL )
          return( NULL );
  
      mbedtls_camellia_init( ctx );
  
      return( ctx );
  }
  
  static void camellia_ctx_free( void *ctx )
  {
      mbedtls_camellia_free( (mbedtls_camellia_context *) ctx );
      mbedtls_free( ctx );
  }
  
  static const mbedtls_cipher_base_t camellia_info = {
      MBEDTLS_CIPHER_ID_CAMELLIA,
      camellia_crypt_ecb_wrap,
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      camellia_crypt_cbc_wrap,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      camellia_crypt_cfb128_wrap,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      camellia_crypt_ctr_wrap,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_STREAM)
      NULL,
  #endif
      camellia_setkey_enc_wrap,
      camellia_setkey_dec_wrap,
      camellia_ctx_alloc,
      camellia_ctx_free
  #if defined(MBEDTLS_CIPHER_MODE_STREAM) && (defined(MBEDTLS_SALSA20_C) || defined(MBEDTLS_CHACHA8_C))
      , NULL
  #endif
  };
  
  static const mbedtls_cipher_info_t camellia_128_ecb_info = {
      MBEDTLS_CIPHER_CAMELLIA_128_ECB,
      MBEDTLS_MODE_ECB,
      128,
      "CAMELLIA-128-ECB",
      16,
      0,
      16,
      &camellia_info
  };
  
  static const mbedtls_cipher_info_t camellia_192_ecb_info = {
      MBEDTLS_CIPHER_CAMELLIA_192_ECB,
      MBEDTLS_MODE_ECB,
      192,
      "CAMELLIA-192-ECB",
      16,
      0,
      16,
      &camellia_info
  };
  
  static const mbedtls_cipher_info_t camellia_256_ecb_info = {
      MBEDTLS_CIPHER_CAMELLIA_256_ECB,
      MBEDTLS_MODE_ECB,
      256,
      "CAMELLIA-256-ECB",
      16,
      0,
      16,
      &camellia_info
  };
  
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
  static const mbedtls_cipher_info_t camellia_128_cbc_info = {
      MBEDTLS_CIPHER_CAMELLIA_128_CBC,
      MBEDTLS_MODE_CBC,
      128,
      "CAMELLIA-128-CBC",
      16,
      0,
      16,
      &camellia_info
  };
  
  static const mbedtls_cipher_info_t camellia_192_cbc_info = {
      MBEDTLS_CIPHER_CAMELLIA_192_CBC,
      MBEDTLS_MODE_CBC,
      192,
      "CAMELLIA-192-CBC",
      16,
      0,
      16,
      &camellia_info
  };
  
  static const mbedtls_cipher_info_t camellia_256_cbc_info = {
      MBEDTLS_CIPHER_CAMELLIA_256_CBC,
      MBEDTLS_MODE_CBC,
      256,
      "CAMELLIA-256-CBC",
      16,
      0,
      16,
      &camellia_info
  };
  #endif /* MBEDTLS_CIPHER_MODE_CBC */
  
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
  static const mbedtls_cipher_info_t camellia_128_cfb128_info = {
      MBEDTLS_CIPHER_CAMELLIA_128_CFB128,
      MBEDTLS_MODE_CFB,
      128,
      "CAMELLIA-128-CFB128",
      16,
      0,
      16,
      &camellia_info
  };
  
  static const mbedtls_cipher_info_t camellia_192_cfb128_info = {
      MBEDTLS_CIPHER_CAMELLIA_192_CFB128,
      MBEDTLS_MODE_CFB,
      192,
      "CAMELLIA-192-CFB128",
      16,
      0,
      16,
      &camellia_info
  };
  
  static const mbedtls_cipher_info_t camellia_256_cfb128_info = {
      MBEDTLS_CIPHER_CAMELLIA_256_CFB128,
      MBEDTLS_MODE_CFB,
      256,
      "CAMELLIA-256-CFB128",
      16,
      0,
      16,
      &camellia_info
  };
  #endif /* MBEDTLS_CIPHER_MODE_CFB */
  
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
  static const mbedtls_cipher_info_t camellia_128_ctr_info = {
      MBEDTLS_CIPHER_CAMELLIA_128_CTR,
      MBEDTLS_MODE_CTR,
      128,
      "CAMELLIA-128-CTR",
      16,
      0,
      16,
      &camellia_info
  };
  
  static const mbedtls_cipher_info_t camellia_192_ctr_info = {
      MBEDTLS_CIPHER_CAMELLIA_192_CTR,
      MBEDTLS_MODE_CTR,
      192,
      "CAMELLIA-192-CTR",
      16,
      0,
      16,
      &camellia_info
  };
  
  static const mbedtls_cipher_info_t camellia_256_ctr_info = {
      MBEDTLS_CIPHER_CAMELLIA_256_CTR,
      MBEDTLS_MODE_CTR,
      256,
      "CAMELLIA-256-CTR",
      16,
      0,
      16,
      &camellia_info
  };
  #endif /* MBEDTLS_CIPHER_MODE_CTR */
  
  #if defined(MBEDTLS_GCM_C)
  static int gcm_camellia_setkey_wrap( void *ctx, const unsigned char *key,
                                       unsigned int key_bitlen )
  {
      return mbedtls_gcm_setkey( (mbedtls_gcm_context *) ctx, MBEDTLS_CIPHER_ID_CAMELLIA,
                       key, key_bitlen );
  }
  
  static const mbedtls_cipher_base_t gcm_camellia_info = {
      MBEDTLS_CIPHER_ID_CAMELLIA,
      NULL,
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_STREAM)
      NULL,
  #endif
      gcm_camellia_setkey_wrap,
      gcm_camellia_setkey_wrap,
      gcm_ctx_alloc,
      gcm_ctx_free
  #if defined(MBEDTLS_CIPHER_MODE_STREAM) && (defined(MBEDTLS_SALSA20_C) || defined(MBEDTLS_CHACHA8_C))
      , NULL
  #endif
  };
  
  static const mbedtls_cipher_info_t camellia_128_gcm_info = {
      MBEDTLS_CIPHER_CAMELLIA_128_GCM,
      MBEDTLS_MODE_GCM,
      128,
      "CAMELLIA-128-GCM",
      12,
      MBEDTLS_CIPHER_VARIABLE_IV_LEN,
      16,
      &gcm_camellia_info
  };
  
  static const mbedtls_cipher_info_t camellia_192_gcm_info = {
      MBEDTLS_CIPHER_CAMELLIA_192_GCM,
      MBEDTLS_MODE_GCM,
      192,
      "CAMELLIA-192-GCM",
      12,
      MBEDTLS_CIPHER_VARIABLE_IV_LEN,
      16,
      &gcm_camellia_info
  };
  
  static const mbedtls_cipher_info_t camellia_256_gcm_info = {
      MBEDTLS_CIPHER_CAMELLIA_256_GCM,
      MBEDTLS_MODE_GCM,
      256,
      "CAMELLIA-256-GCM",
      12,
      MBEDTLS_CIPHER_VARIABLE_IV_LEN,
      16,
      &gcm_camellia_info
  };
  #endif /* MBEDTLS_GCM_C */
  
  #if defined(MBEDTLS_CCM_C)
  static int ccm_camellia_setkey_wrap( void *ctx, const unsigned char *key,
                                       unsigned int key_bitlen )
  {
      return mbedtls_ccm_setkey( (mbedtls_ccm_context *) ctx, MBEDTLS_CIPHER_ID_CAMELLIA,
                       key, key_bitlen );
  }
  
  static const mbedtls_cipher_base_t ccm_camellia_info = {
      MBEDTLS_CIPHER_ID_CAMELLIA,
      NULL,
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_STREAM)
      NULL,
  #endif
      ccm_camellia_setkey_wrap,
      ccm_camellia_setkey_wrap,
      ccm_ctx_alloc,
      ccm_ctx_free
  #if defined(MBEDTLS_CIPHER_MODE_STREAM) && (defined(MBEDTLS_SALSA20_C) || defined(MBEDTLS_CHACHA8_C))
      , NULL
  #endif
  };
  
  static const mbedtls_cipher_info_t camellia_128_ccm_info = {
      MBEDTLS_CIPHER_CAMELLIA_128_CCM,
      MBEDTLS_MODE_CCM,
      128,
      "CAMELLIA-128-CCM",
      12,
      MBEDTLS_CIPHER_VARIABLE_IV_LEN,
      16,
      &ccm_camellia_info
  };
  
  static const mbedtls_cipher_info_t camellia_192_ccm_info = {
      MBEDTLS_CIPHER_CAMELLIA_192_CCM,
      MBEDTLS_MODE_CCM,
      192,
      "CAMELLIA-192-CCM",
      12,
      MBEDTLS_CIPHER_VARIABLE_IV_LEN,
      16,
      &ccm_camellia_info
  };
  
  static const mbedtls_cipher_info_t camellia_256_ccm_info = {
      MBEDTLS_CIPHER_CAMELLIA_256_CCM,
      MBEDTLS_MODE_CCM,
      256,
      "CAMELLIA-256-CCM",
      12,
      MBEDTLS_CIPHER_VARIABLE_IV_LEN,
      16,
      &ccm_camellia_info
  };
  #endif /* MBEDTLS_CCM_C */
  
  #endif /* MBEDTLS_CAMELLIA_C */
  
  #if defined(MBEDTLS_DES_C)
  
  static int des_crypt_ecb_wrap( void *ctx, mbedtls_operation_t operation,
          const unsigned char *input, unsigned char *output )
  {
      ((void) operation);
      return mbedtls_des_crypt_ecb( (mbedtls_des_context *) ctx, input, output );
  }
  
  static int des3_crypt_ecb_wrap( void *ctx, mbedtls_operation_t operation,
          const unsigned char *input, unsigned char *output )
  {
      ((void) operation);
      return mbedtls_des3_crypt_ecb( (mbedtls_des3_context *) ctx, input, output );
  }
  
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
  static int des_crypt_cbc_wrap( void *ctx, mbedtls_operation_t operation, size_t length,
          unsigned char *iv, const unsigned char *input, unsigned char *output )
  {
      return mbedtls_des_crypt_cbc( (mbedtls_des_context *) ctx, operation, length, iv, input,
                            output );
  }
  #endif /* MBEDTLS_CIPHER_MODE_CBC */
  
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
  static int des3_crypt_cbc_wrap( void *ctx, mbedtls_operation_t operation, size_t length,
          unsigned char *iv, const unsigned char *input, unsigned char *output )
  {
      return mbedtls_des3_crypt_cbc( (mbedtls_des3_context *) ctx, operation, length, iv, input,
                             output );
  }
  #endif /* MBEDTLS_CIPHER_MODE_CBC */
  
  static int des_setkey_dec_wrap( void *ctx, const unsigned char *key,
                                  unsigned int key_bitlen )
  {
      ((void) key_bitlen);
  
      return mbedtls_des_setkey_dec( (mbedtls_des_context *) ctx, key );
  }
  
  static int des_setkey_enc_wrap( void *ctx, const unsigned char *key,
                                  unsigned int key_bitlen )
  {
      ((void) key_bitlen);
  
      return mbedtls_des_setkey_enc( (mbedtls_des_context *) ctx, key );
  }
  
  static int des3_set2key_dec_wrap( void *ctx, const unsigned char *key,
                                    unsigned int key_bitlen )
  {
      ((void) key_bitlen);
  
      return mbedtls_des3_set2key_dec( (mbedtls_des3_context *) ctx, key );
  }
  
  static int des3_set2key_enc_wrap( void *ctx, const unsigned char *key,
                                    unsigned int key_bitlen )
  {
      ((void) key_bitlen);
  
      return mbedtls_des3_set2key_enc( (mbedtls_des3_context *) ctx, key );
  }
  
  static int des3_set3key_dec_wrap( void *ctx, const unsigned char *key,
                                    unsigned int key_bitlen )
  {
      ((void) key_bitlen);
  
      return mbedtls_des3_set3key_dec( (mbedtls_des3_context *) ctx, key );
  }
  
  static int des3_set3key_enc_wrap( void *ctx, const unsigned char *key,
                                    unsigned int key_bitlen )
  {
      ((void) key_bitlen);
  
      return mbedtls_des3_set3key_enc( (mbedtls_des3_context *) ctx, key );
  }
  
  static void * des_ctx_alloc( void )
  {
      mbedtls_des_context *des = mbedtls_calloc( 1, sizeof( mbedtls_des_context ) );
  
      if( des == NULL )
          return( NULL );
  
      mbedtls_des_init( des );
  
      return( des );
  }
  
  static void des_ctx_free( void *ctx )
  {
      mbedtls_des_free( (mbedtls_des_context *) ctx );
      mbedtls_free( ctx );
  }
  
  static void * des3_ctx_alloc( void )
  {
      mbedtls_des3_context *des3;
      des3 = mbedtls_calloc( 1, sizeof( mbedtls_des3_context ) );
  
      if( des3 == NULL )
          return( NULL );
  
      mbedtls_des3_init( des3 );
  
      return( des3 );
  }
  
  static void des3_ctx_free( void *ctx )
  {
      mbedtls_des3_free( (mbedtls_des3_context *) ctx );
      mbedtls_free( ctx );
  }
  
  static const mbedtls_cipher_base_t des_info = {
      MBEDTLS_CIPHER_ID_DES,
      des_crypt_ecb_wrap,
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      des_crypt_cbc_wrap,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_STREAM)
      NULL,
  #endif
      des_setkey_enc_wrap,
      des_setkey_dec_wrap,
      des_ctx_alloc,
      des_ctx_free
  #if defined(MBEDTLS_CIPHER_MODE_STREAM) && (defined(MBEDTLS_SALSA20_C) || defined(MBEDTLS_CHACHA8_C))
  	, NULL
  #endif
  };
  
  static const mbedtls_cipher_info_t des_ecb_info = {
      MBEDTLS_CIPHER_DES_ECB,
      MBEDTLS_MODE_ECB,
      MBEDTLS_KEY_LENGTH_DES,
      "DES-ECB",
      8,
      0,
      8,
      &des_info
  };
  
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
  static const mbedtls_cipher_info_t des_cbc_info = {
      MBEDTLS_CIPHER_DES_CBC,
      MBEDTLS_MODE_CBC,
      MBEDTLS_KEY_LENGTH_DES,
      "DES-CBC",
      8,
      0,
      8,
      &des_info
  };
  #endif /* MBEDTLS_CIPHER_MODE_CBC */
  
  static const mbedtls_cipher_base_t des_ede_info = {
      MBEDTLS_CIPHER_ID_DES,
      des3_crypt_ecb_wrap,
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      des3_crypt_cbc_wrap,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_STREAM)
      NULL,
  #endif
      des3_set2key_enc_wrap,
      des3_set2key_dec_wrap,
      des3_ctx_alloc,
      des3_ctx_free
  #if defined(MBEDTLS_CIPHER_MODE_STREAM) && (defined(MBEDTLS_SALSA20_C) || defined(MBEDTLS_CHACHA8_C))
      , NULL
  #endif
  };
  
  static const mbedtls_cipher_info_t des_ede_ecb_info = {
      MBEDTLS_CIPHER_DES_EDE_ECB,
      MBEDTLS_MODE_ECB,
      MBEDTLS_KEY_LENGTH_DES_EDE,
      "DES-EDE-ECB",
      8,
      0,
      8,
      &des_ede_info
  };
  
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
  static const mbedtls_cipher_info_t des_ede_cbc_info = {
      MBEDTLS_CIPHER_DES_EDE_CBC,
      MBEDTLS_MODE_CBC,
      MBEDTLS_KEY_LENGTH_DES_EDE,
      "DES-EDE-CBC",
      8,
      0,
      8,
      &des_ede_info
  };
  #endif /* MBEDTLS_CIPHER_MODE_CBC */
  
  static const mbedtls_cipher_base_t des_ede3_info = {
      MBEDTLS_CIPHER_ID_3DES,
      des3_crypt_ecb_wrap,
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      des3_crypt_cbc_wrap,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_STREAM)
      NULL,
  #endif
      des3_set3key_enc_wrap,
      des3_set3key_dec_wrap,
      des3_ctx_alloc,
      des3_ctx_free
  #if defined(MBEDTLS_CIPHER_MODE_STREAM) && (defined(MBEDTLS_SALSA20_C) || defined(MBEDTLS_CHACHA8_C))
      , NULL
  #endif
  };
  
  static const mbedtls_cipher_info_t des_ede3_ecb_info = {
      MBEDTLS_CIPHER_DES_EDE3_ECB,
      MBEDTLS_MODE_ECB,
      MBEDTLS_KEY_LENGTH_DES_EDE3,
      "DES-EDE3-ECB",
      8,
      0,
      8,
      &des_ede3_info
  };
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
  static const mbedtls_cipher_info_t des_ede3_cbc_info = {
      MBEDTLS_CIPHER_DES_EDE3_CBC,
      MBEDTLS_MODE_CBC,
      MBEDTLS_KEY_LENGTH_DES_EDE3,
      "DES-EDE3-CBC",
      8,
      0,
      8,
      &des_ede3_info
  };
  #endif /* MBEDTLS_CIPHER_MODE_CBC */
  #endif /* MBEDTLS_DES_C */
  
  #if defined(MBEDTLS_BLOWFISH_C)
  
  static int blowfish_crypt_ecb_wrap( void *ctx, mbedtls_operation_t operation,
          const unsigned char *input, unsigned char *output )
  {
      return mbedtls_blowfish_crypt_ecb( (mbedtls_blowfish_context *) ctx, operation, input,
                                 output );
  }
  
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
  static int blowfish_crypt_cbc_wrap( void *ctx, mbedtls_operation_t operation,
          size_t length, unsigned char *iv, const unsigned char *input,
          unsigned char *output )
  {
      return mbedtls_blowfish_crypt_cbc( (mbedtls_blowfish_context *) ctx, operation, length, iv,
                                 input, output );
  }
  #endif /* MBEDTLS_CIPHER_MODE_CBC */
  
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
  static int blowfish_crypt_cfb64_wrap( void *ctx, mbedtls_operation_t operation,
          size_t length, size_t *iv_off, unsigned char *iv,
          const unsigned char *input, unsigned char *output )
  {
      return mbedtls_blowfish_crypt_cfb64( (mbedtls_blowfish_context *) ctx, operation, length,
                                   iv_off, iv, input, output );
  }
  #endif /* MBEDTLS_CIPHER_MODE_CFB */
  
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
  static int blowfish_crypt_ctr_wrap( void *ctx, size_t length, size_t *nc_off,
          unsigned char *nonce_counter, unsigned char *stream_block,
          const unsigned char *input, unsigned char *output )
  {
      return mbedtls_blowfish_crypt_ctr( (mbedtls_blowfish_context *) ctx, length, nc_off,
                                 nonce_counter, stream_block, input, output );
  }
  #endif /* MBEDTLS_CIPHER_MODE_CTR */
  
  static int blowfish_setkey_wrap( void *ctx, const unsigned char *key,
                                   unsigned int key_bitlen )
  {
      return mbedtls_blowfish_setkey( (mbedtls_blowfish_context *) ctx, key, key_bitlen );
  }
  
  static void * blowfish_ctx_alloc( void )
  {
      mbedtls_blowfish_context *ctx;
      ctx = mbedtls_calloc( 1, sizeof( mbedtls_blowfish_context ) );
  
      if( ctx == NULL )
          return( NULL );
  
      mbedtls_blowfish_init( ctx );
  
      return( ctx );
  }
  
  static void blowfish_ctx_free( void *ctx )
  {
      mbedtls_blowfish_free( (mbedtls_blowfish_context *) ctx );
      mbedtls_free( ctx );
  }
  
  static const mbedtls_cipher_base_t blowfish_info = {
      MBEDTLS_CIPHER_ID_BLOWFISH,
      blowfish_crypt_ecb_wrap,
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      blowfish_crypt_cbc_wrap,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      blowfish_crypt_cfb64_wrap,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      blowfish_crypt_ctr_wrap,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_STREAM)
      NULL,
  #endif
      blowfish_setkey_wrap,
      blowfish_setkey_wrap,
      blowfish_ctx_alloc,
      blowfish_ctx_free
  #if defined(MBEDTLS_CIPHER_MODE_STREAM) && (defined(MBEDTLS_SALSA20_C) || defined(MBEDTLS_CHACHA8_C))
      , NULL
  #endif
  };
  
  static const mbedtls_cipher_info_t blowfish_ecb_info = {
      MBEDTLS_CIPHER_BLOWFISH_ECB,
      MBEDTLS_MODE_ECB,
      128,
      "BLOWFISH-ECB",
      8,
      MBEDTLS_CIPHER_VARIABLE_KEY_LEN,
      8,
      &blowfish_info
  };
  
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
  static const mbedtls_cipher_info_t blowfish_cbc_info = {
      MBEDTLS_CIPHER_BLOWFISH_CBC,
      MBEDTLS_MODE_CBC,
      128,
      "BLOWFISH-CBC",
      8,
      MBEDTLS_CIPHER_VARIABLE_KEY_LEN,
      8,
      &blowfish_info
  };
  #endif /* MBEDTLS_CIPHER_MODE_CBC */
  
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
  static const mbedtls_cipher_info_t blowfish_cfb64_info = {
      MBEDTLS_CIPHER_BLOWFISH_CFB64,
      MBEDTLS_MODE_CFB,
      128,
      "BLOWFISH-CFB64",
      8,
      MBEDTLS_CIPHER_VARIABLE_KEY_LEN,
      8,
      &blowfish_info
  };
  #endif /* MBEDTLS_CIPHER_MODE_CFB */
  
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
  static const mbedtls_cipher_info_t blowfish_ctr_info = {
      MBEDTLS_CIPHER_BLOWFISH_CTR,
      MBEDTLS_MODE_CTR,
      128,
      "BLOWFISH-CTR",
      8,
      MBEDTLS_CIPHER_VARIABLE_KEY_LEN,
      8,
      &blowfish_info
  };
  #endif /* MBEDTLS_CIPHER_MODE_CTR */
  #endif /* MBEDTLS_BLOWFISH_C */
  
  #if defined(MBEDTLS_ARC4_C)
  static int arc4_crypt_stream_wrap( void *ctx, size_t length,
                                     const unsigned char *input,
                                     unsigned char *output )
  {
      return( mbedtls_arc4_crypt( (mbedtls_arc4_context *) ctx, length, input, output ) );
  }
  
  static int arc4_setkey_wrap( void *ctx, const unsigned char *key,
                               unsigned int key_bitlen )
  {
      /* we get key_bitlen in bits, arc4 expects it in bytes */
      if( key_bitlen % 8 != 0 )
          return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
  
      mbedtls_arc4_setup( (mbedtls_arc4_context *) ctx, key, key_bitlen / 8 );
      return( 0 );
  }
  
  static void * arc4_ctx_alloc( void )
  {
      mbedtls_arc4_context *ctx;
      ctx = mbedtls_calloc( 1, sizeof( mbedtls_arc4_context ) );
  
      if( ctx == NULL )
          return( NULL );
  
      mbedtls_arc4_init( ctx );
  
      return( ctx );
  }
  
  static void arc4_ctx_free( void *ctx )
  {
      mbedtls_arc4_free( (mbedtls_arc4_context *) ctx );
      mbedtls_free( ctx );
  }
  
  static const mbedtls_cipher_base_t arc4_base_info = {
      MBEDTLS_CIPHER_ID_ARC4,
      NULL,
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_STREAM)
      arc4_crypt_stream_wrap,
  #endif
      arc4_setkey_wrap,
      arc4_setkey_wrap,
      arc4_ctx_alloc,
      arc4_ctx_free
  #if defined(MBEDTLS_CIPHER_MODE_STREAM) && (defined(MBEDTLS_SALSA20_C) || defined(MBEDTLS_CHACHA8_C))
      , NULL
  #endif
  };
  
  static const mbedtls_cipher_info_t arc4_128_info = {
      MBEDTLS_CIPHER_ARC4_128,
      MBEDTLS_MODE_STREAM,
      128,
      "ARC4-128",
      0,
      0,
      1,
      &arc4_base_info
  };
  #endif /* MBEDTLS_ARC4_C */
  
  #if defined(MBEDTLS_SALSA20_C)
  static int salsa20_crypt_stream_wrap( void *ctx, size_t length, const unsigned char *input,
                                     unsigned char *output )
  {
      return( mbedtls_salsa20_crypt( (mbedtls_salsa20_context *) ctx, length, input, output) );
  }
  
  static void salsa20_set_iv( void *ctx, unsigned char *iv )
  {
      mbedtls_salsa20_set_iv( ctx, iv );
  }
  
  static int salsa20_setkey_wrap( void *ctx, const unsigned char *key,
                               unsigned int key_bitlen )
  {
      mbedtls_salsa20_setup( (mbedtls_salsa20_context *) ctx, key, key_bitlen );
      return( 0 );
  }
  
  static void * salsa20_ctx_alloc( void )
  {
      mbedtls_salsa20_context *ctx;
      ctx = mbedtls_calloc( 1, sizeof( mbedtls_salsa20_context ) );
  
      if( ctx == NULL )
          return( NULL );
  
      mbedtls_salsa20_init( ctx );
  
      return( ctx );
  }
  
  static void salsa20_ctx_free( void *ctx )
  {
      mbedtls_salsa20_free( (mbedtls_salsa20_context *) ctx );
      mbedtls_free( ctx );
  }
  
  static const mbedtls_cipher_base_t salsa20_base_info = {
          MBEDTLS_CIPHER_ID_SALSA20,
          NULL,
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
          NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
          NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
          NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_STREAM)
          salsa20_crypt_stream_wrap,
  #endif
          salsa20_setkey_wrap,
          salsa20_setkey_wrap,
          salsa20_ctx_alloc,
          salsa20_ctx_free
  #if defined(MBEDTLS_CIPHER_MODE_STREAM) && (defined(MBEDTLS_SALSA20_C) || defined(MBEDTLS_CHACHA8_C))
          , salsa20_set_iv
  #endif
  };
  
  static const mbedtls_cipher_info_t salsa20_128_info = {
          MBEDTLS_CIPHER_SALSA20_128,
          MBEDTLS_MODE_STREAM_IV,
          128,
          "SALSA20-128",
          8,
          0,
          1,
          &salsa20_base_info
  };
  
  static const mbedtls_cipher_info_t salsa20_256_info = {
          MBEDTLS_CIPHER_SALSA20_256,
          MBEDTLS_MODE_STREAM_IV,
          256,
          "SALSA20-256",
          8,
          0,
          1,
          &salsa20_base_info
  };
  #endif /* MBEDTLS_SALSA20_C */
  
  #if defined(MBEDTLS_CHACHA8_C)
  
  static int chacha8_crypt_stream_wrap( void *ctx, size_t length, const unsigned char *input,
                                        unsigned char *output )
  
  {
      return( mbedtls_chacha8_crypt( (mbedtls_chacha8_context *) ctx, length, input, output ) );
  }
  
  static void chacha8_set_iv( void *ctx, unsigned char *iv )
  {
      mbedtls_chacha8_set_iv( ctx, iv );
  }
  
  static int chacha8_setkey_wrap( void *ctx, const unsigned char *key,
                                     unsigned int key_bitlen )
  {
      mbedtls_chacha8_setup( (mbedtls_chacha8_context *) ctx, key, key_bitlen );
      return( 0 );
  }
  
  static void * chacha8_ctx_alloc( void )
  {
      mbedtls_chacha8_context *ctx;
      ctx = mbedtls_calloc( 1, sizeof( mbedtls_chacha8_context ) );
  
      if( ctx == NULL )
          return( NULL );
  
      mbedtls_chacha8_init( ctx );
  
      return( ctx );
  }
  
  static void chacha8_ctx_free( void *ctx )
  {
      mbedtls_chacha8_free( (mbedtls_chacha8_context *) ctx );
      mbedtls_free( ctx );
  }
  
  static const mbedtls_cipher_base_t chacha8_base_info = {
          MBEDTLS_CIPHER_ID_CHACHA8,
          NULL,
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
          NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
          NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
          NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_STREAM)
          chacha8_crypt_stream_wrap,
  #endif
          chacha8_setkey_wrap,
          chacha8_setkey_wrap,
          chacha8_ctx_alloc,
          chacha8_ctx_free
  #if defined(MBEDTLS_CIPHER_MODE_STREAM) && (defined(MBEDTLS_SALSA20_C) || defined(MBEDTLS_CHACHA8_C))
          , chacha8_set_iv
  #endif
  };
  
  static const mbedtls_cipher_info_t chacha8_128_info = {
          MBEDTLS_CIPHER_CHACHA8_128,
          MBEDTLS_MODE_STREAM_IV,
          128,
          "CHACHA8-128",
          8,
          0,
          1,
          &chacha8_base_info
  };
  
  
  static const mbedtls_cipher_info_t chacha8_256_info = {
          MBEDTLS_CIPHER_CHACHA8_256,
          MBEDTLS_MODE_STREAM_IV,
          256,
          "CHACHA8-256",
          8,
          0,
          1,
          &chacha8_base_info
  };
  #endif /* MBEDTLS_CHACHA8_C */
  
  #if defined(MBEDTLS_CIPHER_NULL_CIPHER)
  static int null_crypt_stream( void *ctx, size_t length,
                                const unsigned char *input,
                                unsigned char *output )
  {
      ((void) ctx);
      memmove( output, input, length );
      return( 0 );
  }
  
  static int null_setkey( void *ctx, const unsigned char *key,
                          unsigned int key_bitlen )
  {
      ((void) ctx);
      ((void) key);
      ((void) key_bitlen);
  
      return( 0 );
  }
  
  static void * null_ctx_alloc( void )
  {
      return( (void *) 1 );
  }
  
  static void null_ctx_free( void *ctx )
  {
      ((void) ctx);
  }
  
  static void null_set_iv( void *ctx, unsigned char *iv )
  {
      ((void) ctx);
      ((void) iv);
  }
  
  static const mbedtls_cipher_base_t null_base_info = {
      MBEDTLS_CIPHER_ID_NULL,
      NULL,
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      NULL,
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_STREAM)
      null_crypt_stream,
  #endif
      null_setkey,
      null_setkey,
      null_ctx_alloc,
      null_ctx_free,
      null_set_iv
  };
  
  static const mbedtls_cipher_info_t null_cipher_info = {
      MBEDTLS_CIPHER_NULL,
      MBEDTLS_MODE_STREAM,
      0,
      "NULL",
      0,
      0,
      1,
      &null_base_info
  };
  #endif /* defined(MBEDTLS_CIPHER_NULL_CIPHER) */
  
  const mbedtls_cipher_definition_t mbedtls_cipher_definitions[] =
  {
  #if defined(MBEDTLS_AES_C)
      { MBEDTLS_CIPHER_AES_128_ECB,          &aes_128_ecb_info },
      { MBEDTLS_CIPHER_AES_192_ECB,          &aes_192_ecb_info },
      { MBEDTLS_CIPHER_AES_256_ECB,          &aes_256_ecb_info },
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      { MBEDTLS_CIPHER_AES_128_CBC,          &aes_128_cbc_info },
      { MBEDTLS_CIPHER_AES_192_CBC,          &aes_192_cbc_info },
      { MBEDTLS_CIPHER_AES_256_CBC,          &aes_256_cbc_info },
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      { MBEDTLS_CIPHER_AES_128_CFB128,       &aes_128_cfb128_info },
      { MBEDTLS_CIPHER_AES_192_CFB128,       &aes_192_cfb128_info },
      { MBEDTLS_CIPHER_AES_256_CFB128,       &aes_256_cfb128_info },
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      { MBEDTLS_CIPHER_AES_128_CTR,          &aes_128_ctr_info },
      { MBEDTLS_CIPHER_AES_192_CTR,          &aes_192_ctr_info },
      { MBEDTLS_CIPHER_AES_256_CTR,          &aes_256_ctr_info },
  #endif
  #if defined(MBEDTLS_GCM_C)
      { MBEDTLS_CIPHER_AES_128_GCM,          &aes_128_gcm_info },
      { MBEDTLS_CIPHER_AES_192_GCM,          &aes_192_gcm_info },
      { MBEDTLS_CIPHER_AES_256_GCM,          &aes_256_gcm_info },
  #endif
  #if defined(MBEDTLS_CCM_C)
      { MBEDTLS_CIPHER_AES_128_CCM,          &aes_128_ccm_info },
      { MBEDTLS_CIPHER_AES_192_CCM,          &aes_192_ccm_info },
      { MBEDTLS_CIPHER_AES_256_CCM,          &aes_256_ccm_info },
  #endif
  #endif /* MBEDTLS_AES_C */
  
  #if defined(MBEDTLS_ARC4_C)
      { MBEDTLS_CIPHER_ARC4_128,             &arc4_128_info },
  #endif
  
  #if defined(MBEDTLS_SALSA20_C)
      { MBEDTLS_CIPHER_SALSA20_128,          &salsa20_128_info },
      { MBEDTLS_CIPHER_SALSA20_256,          &salsa20_256_info },
  #endif
  
  #if defined(MBEDTLS_CHACHA8_C)
      { MBEDTLS_CIPHER_CHACHA8_128,          &chacha8_128_info },
      { MBEDTLS_CIPHER_CHACHA8_256,          &chacha8_256_info },
  #endif
  
  #if defined(MBEDTLS_BLOWFISH_C)
      { MBEDTLS_CIPHER_BLOWFISH_ECB,         &blowfish_ecb_info },
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      { MBEDTLS_CIPHER_BLOWFISH_CBC,         &blowfish_cbc_info },
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      { MBEDTLS_CIPHER_BLOWFISH_CFB64,       &blowfish_cfb64_info },
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      { MBEDTLS_CIPHER_BLOWFISH_CTR,         &blowfish_ctr_info },
  #endif
  #endif /* MBEDTLS_BLOWFISH_C */
  
  #if defined(MBEDTLS_CAMELLIA_C)
      { MBEDTLS_CIPHER_CAMELLIA_128_ECB,     &camellia_128_ecb_info },
      { MBEDTLS_CIPHER_CAMELLIA_192_ECB,     &camellia_192_ecb_info },
      { MBEDTLS_CIPHER_CAMELLIA_256_ECB,     &camellia_256_ecb_info },
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      { MBEDTLS_CIPHER_CAMELLIA_128_CBC,     &camellia_128_cbc_info },
      { MBEDTLS_CIPHER_CAMELLIA_192_CBC,     &camellia_192_cbc_info },
      { MBEDTLS_CIPHER_CAMELLIA_256_CBC,     &camellia_256_cbc_info },
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CFB)
      { MBEDTLS_CIPHER_CAMELLIA_128_CFB128,  &camellia_128_cfb128_info },
      { MBEDTLS_CIPHER_CAMELLIA_192_CFB128,  &camellia_192_cfb128_info },
      { MBEDTLS_CIPHER_CAMELLIA_256_CFB128,  &camellia_256_cfb128_info },
  #endif
  #if defined(MBEDTLS_CIPHER_MODE_CTR)
      { MBEDTLS_CIPHER_CAMELLIA_128_CTR,     &camellia_128_ctr_info },
      { MBEDTLS_CIPHER_CAMELLIA_192_CTR,     &camellia_192_ctr_info },
      { MBEDTLS_CIPHER_CAMELLIA_256_CTR,     &camellia_256_ctr_info },
  #endif
  #if defined(MBEDTLS_GCM_C)
      { MBEDTLS_CIPHER_CAMELLIA_128_GCM,     &camellia_128_gcm_info },
      { MBEDTLS_CIPHER_CAMELLIA_192_GCM,     &camellia_192_gcm_info },
      { MBEDTLS_CIPHER_CAMELLIA_256_GCM,     &camellia_256_gcm_info },
  #endif
  #if defined(MBEDTLS_CCM_C)
      { MBEDTLS_CIPHER_CAMELLIA_128_CCM,     &camellia_128_ccm_info },
      { MBEDTLS_CIPHER_CAMELLIA_192_CCM,     &camellia_192_ccm_info },
      { MBEDTLS_CIPHER_CAMELLIA_256_CCM,     &camellia_256_ccm_info },
  #endif
  #endif /* MBEDTLS_CAMELLIA_C */
  
  #if defined(MBEDTLS_DES_C)
      { MBEDTLS_CIPHER_DES_ECB,              &des_ecb_info },
      { MBEDTLS_CIPHER_DES_EDE_ECB,          &des_ede_ecb_info },
      { MBEDTLS_CIPHER_DES_EDE3_ECB,         &des_ede3_ecb_info },
  #if defined(MBEDTLS_CIPHER_MODE_CBC)
      { MBEDTLS_CIPHER_DES_CBC,              &des_cbc_info },
      { MBEDTLS_CIPHER_DES_EDE_CBC,          &des_ede_cbc_info },
      { MBEDTLS_CIPHER_DES_EDE3_CBC,         &des_ede3_cbc_info },
  #endif
  #endif /* MBEDTLS_DES_C */
  
  #if defined(MBEDTLS_CIPHER_NULL_CIPHER)
      { MBEDTLS_CIPHER_NULL,                 &null_cipher_info },
  #endif /* MBEDTLS_CIPHER_NULL_CIPHER */
  
      { MBEDTLS_CIPHER_NONE, NULL }
  };
  
  #define NUM_CIPHERS sizeof mbedtls_cipher_definitions / sizeof mbedtls_cipher_definitions[0]
  int mbedtls_cipher_supported[NUM_CIPHERS];
  
  #endif /* MBEDTLS_CIPHER_C */
  