text: /*
   *  Error message information
   *
   *  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_ERROR_C) || defined(MBEDTLS_ERROR_STRERROR_DUMMY)
  #include "mbedtls/error.h"
  #include <string.h>
  #endif
  
  #if defined(MBEDTLS_PLATFORM_C)
  #include "mbedtls/platform.h"
  #else
  #define mbedtls_snprintf snprintf
  #define mbedtls_time_t   time_t
  #endif
  
  #if defined(MBEDTLS_ERROR_C)
  
  #include <stdio.h>
  
  #if defined(MBEDTLS_AES_C)
  #include "mbedtls/aes.h"
  #endif
  
  #if defined(MBEDTLS_ARC4_C)
  #include "mbedtls/arc4.h"
  #endif
  
  #if defined(MBEDTLS_ARIA_C)
  #include "mbedtls/aria.h"
  #endif
  
  #if defined(MBEDTLS_BASE64_C)
  #include "mbedtls/base64.h"
  #endif
  
  #if defined(MBEDTLS_BIGNUM_C)
  #include "mbedtls/bignum.h"
  #endif
  
  #if defined(MBEDTLS_BLOWFISH_C)
  #include "mbedtls/blowfish.h"
  #endif
  
  #if defined(MBEDTLS_CAMELLIA_C)
  #include "mbedtls/camellia.h"
  #endif
  
  #if defined(MBEDTLS_CCM_C)
  #include "mbedtls/ccm.h"
  #endif
  
  #if defined(MBEDTLS_CHACHA20_C)
  #include "mbedtls/chacha20.h"
  #endif
  
  #if defined(MBEDTLS_CHACHAPOLY_C)
  #include "mbedtls/chachapoly.h"
  #endif
  
  #if defined(MBEDTLS_CIPHER_C)
  #include "mbedtls/cipher.h"
  #endif
  
  #if defined(MBEDTLS_CMAC_C)
  #include "mbedtls/cmac.h"
  #endif
  
  #if defined(MBEDTLS_CTR_DRBG_C)
  #include "mbedtls/ctr_drbg.h"
  #endif
  
  #if defined(MBEDTLS_DES_C)
  #include "mbedtls/des.h"
  #endif
  
  #if defined(MBEDTLS_DHM_C)
  #include "mbedtls/dhm.h"
  #endif
  
  #if defined(MBEDTLS_ECP_C)
  #include "mbedtls/ecp.h"
  #endif
  
  #if defined(MBEDTLS_ENTROPY_C)
  #include "mbedtls/entropy.h"
  #endif
  
  #if defined(MBEDTLS_GCM_C)
  #include "mbedtls/gcm.h"
  #endif
  
  #if defined(MBEDTLS_HKDF_C)
  #include "mbedtls/hkdf.h"
  #endif
  
  #if defined(MBEDTLS_HMAC_DRBG_C)
  #include "mbedtls/hmac_drbg.h"
  #endif
  
  #if defined(MBEDTLS_MD_C)
  #include "mbedtls/md.h"
  #endif
  
  #if defined(MBEDTLS_MD2_C)
  #include "mbedtls/md2.h"
  #endif
  
  #if defined(MBEDTLS_MD4_C)
  #include "mbedtls/md4.h"
  #endif
  
  #if defined(MBEDTLS_MD5_C)
  #include "mbedtls/md5.h"
  #endif
  
  #if defined(MBEDTLS_OID_C)
  #include "mbedtls/oid.h"
  #endif
  
  #if defined(MBEDTLS_PADLOCK_C)
  #include "mbedtls/padlock.h"
  #endif
  
  #if defined(MBEDTLS_PEM_PARSE_C) || defined(MBEDTLS_PEM_WRITE_C)
  #include "mbedtls/pem.h"
  #endif
  
  #if defined(MBEDTLS_PK_C)
  #include "mbedtls/pk.h"
  #endif
  
  #if defined(MBEDTLS_PKCS12_C)
  #include "mbedtls/pkcs12.h"
  #endif
  
  #if defined(MBEDTLS_PKCS5_C)
  #include "mbedtls/pkcs5.h"
  #endif
  
  #if defined(MBEDTLS_PLATFORM_C)
  #include "mbedtls/platform.h"
  #endif
  
  #if defined(MBEDTLS_POLY1305_C)
  #include "mbedtls/poly1305.h"
  #endif
  
  #if defined(MBEDTLS_RIPEMD160_C)
  #include "mbedtls/ripemd160.h"
  #endif
  
  #if defined(MBEDTLS_RSA_C)
  #include "mbedtls/rsa.h"
  #endif
  
  #if defined(MBEDTLS_SHA1_C)
  #include "mbedtls/sha1.h"
  #endif
  
  #if defined(MBEDTLS_SHA256_C)
  #include "mbedtls/sha256.h"
  #endif
  
  #if defined(MBEDTLS_SHA512_C)
  #include "mbedtls/sha512.h"
  #endif
  
  #if defined(MBEDTLS_THREADING_C)
  #include "mbedtls/threading.h"
  #endif
  
  #if defined(MBEDTLS_XTEA_C)
  #include "mbedtls/xtea.h"
  #endif
  
  
  void mbedtls_strerror( int ret, char *buf, size_t buflen )
  {
      size_t len;
      int use_ret;
  
      if( buflen == 0 )
          return;
  
      memset( buf, 0x00, buflen );
  
      if( ret < 0 )
          ret = -ret;
  
      if( ret & 0xFF80 )
      {
          use_ret = ret & 0xFF80;
  
          // High level error codes
          //
          // BEGIN generated code
  #if defined(MBEDTLS_CIPHER_C)
          if( use_ret == -(MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE) )
              mbedtls_snprintf( buf, buflen, "CIPHER - The selected feature is not available" );
          if( use_ret == -(MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA) )
              mbedtls_snprintf( buf, buflen, "CIPHER - Bad input parameters" );
          if( use_ret == -(MBEDTLS_ERR_CIPHER_ALLOC_FAILED) )
              mbedtls_snprintf( buf, buflen, "CIPHER - Failed to allocate memory" );
          if( use_ret == -(MBEDTLS_ERR_CIPHER_INVALID_PADDING) )
              mbedtls_snprintf( buf, buflen, "CIPHER - Input data contains invalid padding and is rejected" );
          if( use_ret == -(MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED) )
              mbedtls_snprintf( buf, buflen, "CIPHER - Decryption of block requires a full block" );
          if( use_ret == -(MBEDTLS_ERR_CIPHER_AUTH_FAILED) )
              mbedtls_snprintf( buf, buflen, "CIPHER - Authentication failed (for AEAD modes)" );
          if( use_ret == -(MBEDTLS_ERR_CIPHER_INVALID_CONTEXT) )
              mbedtls_snprintf( buf, buflen, "CIPHER - The context is invalid. For example, because it was freed" );
          if( use_ret == -(MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED) )
              mbedtls_snprintf( buf, buflen, "CIPHER - Cipher hardware accelerator failed" );
  #endif /* MBEDTLS_CIPHER_C */
  
  #if defined(MBEDTLS_DHM_C)
          if( use_ret == -(MBEDTLS_ERR_DHM_BAD_INPUT_DATA) )
              mbedtls_snprintf( buf, buflen, "DHM - Bad input parameters" );
          if( use_ret == -(MBEDTLS_ERR_DHM_READ_PARAMS_FAILED) )
              mbedtls_snprintf( buf, buflen, "DHM - Reading of the DHM parameters failed" );
          if( use_ret == -(MBEDTLS_ERR_DHM_MAKE_PARAMS_FAILED) )
              mbedtls_snprintf( buf, buflen, "DHM - Making of the DHM parameters failed" );
          if( use_ret == -(MBEDTLS_ERR_DHM_READ_PUBLIC_FAILED) )
              mbedtls_snprintf( buf, buflen, "DHM - Reading of the public values failed" );
          if( use_ret == -(MBEDTLS_ERR_DHM_MAKE_PUBLIC_FAILED) )
              mbedtls_snprintf( buf, buflen, "DHM - Making of the public value failed" );
          if( use_ret == -(MBEDTLS_ERR_DHM_CALC_SECRET_FAILED) )
              mbedtls_snprintf( buf, buflen, "DHM - Calculation of the DHM secret failed" );
          if( use_ret == -(MBEDTLS_ERR_DHM_INVALID_FORMAT) )
              mbedtls_snprintf( buf, buflen, "DHM - The ASN.1 data is not formatted correctly" );
          if( use_ret == -(MBEDTLS_ERR_DHM_ALLOC_FAILED) )
              mbedtls_snprintf( buf, buflen, "DHM - Allocation of memory failed" );
          if( use_ret == -(MBEDTLS_ERR_DHM_FILE_IO_ERROR) )
              mbedtls_snprintf( buf, buflen, "DHM - Read or write of file failed" );
          if( use_ret == -(MBEDTLS_ERR_DHM_HW_ACCEL_FAILED) )
              mbedtls_snprintf( buf, buflen, "DHM - DHM hardware accelerator failed" );
          if( use_ret == -(MBEDTLS_ERR_DHM_SET_GROUP_FAILED) )
              mbedtls_snprintf( buf, buflen, "DHM - Setting the modulus and generator failed" );
  #endif /* MBEDTLS_DHM_C */
  
  #if defined(MBEDTLS_ECP_C)
          if( use_ret == -(MBEDTLS_ERR_ECP_BAD_INPUT_DATA) )
              mbedtls_snprintf( buf, buflen, "ECP - Bad input parameters to function" );
          if( use_ret == -(MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL) )
              mbedtls_snprintf( buf, buflen, "ECP - The buffer is too small to write to" );
          if( use_ret == -(MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE) )
              mbedtls_snprintf( buf, buflen, "ECP - The requested feature is not available, for example, the requested curve is not supported" );
          if( use_ret == -(MBEDTLS_ERR_ECP_VERIFY_FAILED) )
              mbedtls_snprintf( buf, buflen, "ECP - The signature is not valid" );
          if( use_ret == -(MBEDTLS_ERR_ECP_ALLOC_FAILED) )
              mbedtls_snprintf( buf, buflen, "ECP - Memory allocation failed" );
          if( use_ret == -(MBEDTLS_ERR_ECP_RANDOM_FAILED) )
              mbedtls_snprintf( buf, buflen, "ECP - Generation of random value, such as ephemeral key, failed" );
          if( use_ret == -(MBEDTLS_ERR_ECP_INVALID_KEY) )
              mbedtls_snprintf( buf, buflen, "ECP - Invalid private or public key" );
          if( use_ret == -(MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH) )
              mbedtls_snprintf( buf, buflen, "ECP - The buffer contains a valid signature followed by more data" );
          if( use_ret == -(MBEDTLS_ERR_ECP_HW_ACCEL_FAILED) )
              mbedtls_snprintf( buf, buflen, "ECP - The ECP hardware accelerator failed" );
          if( use_ret == -(MBEDTLS_ERR_ECP_IN_PROGRESS) )
              mbedtls_snprintf( buf, buflen, "ECP - Operation in progress, call again with the same parameters to continue" );
  #endif /* MBEDTLS_ECP_C */
  
  #if defined(MBEDTLS_MD_C)
          if( use_ret == -(MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE) )
              mbedtls_snprintf( buf, buflen, "MD - The selected feature is not available" );
          if( use_ret == -(MBEDTLS_ERR_MD_BAD_INPUT_DATA) )
              mbedtls_snprintf( buf, buflen, "MD - Bad input parameters to function" );
          if( use_ret == -(MBEDTLS_ERR_MD_ALLOC_FAILED) )
              mbedtls_snprintf( buf, buflen, "MD - Failed to allocate memory" );
          if( use_ret == -(MBEDTLS_ERR_MD_FILE_IO_ERROR) )
              mbedtls_snprintf( buf, buflen, "MD - Opening or reading of file failed" );
          if( use_ret == -(MBEDTLS_ERR_MD_HW_ACCEL_FAILED) )
              mbedtls_snprintf( buf, buflen, "MD - MD hardware accelerator failed" );
  #endif /* MBEDTLS_MD_C */
  
  #if defined(MBEDTLS_PEM_PARSE_C) || defined(MBEDTLS_PEM_WRITE_C)
          if( use_ret == -(MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) )
              mbedtls_snprintf( buf, buflen, "PEM - No PEM header or footer found" );
          if( use_ret == -(MBEDTLS_ERR_PEM_INVALID_DATA) )
              mbedtls_snprintf( buf, buflen, "PEM - PEM string is not as expected" );
          if( use_ret == -(MBEDTLS_ERR_PEM_ALLOC_FAILED) )
              mbedtls_snprintf( buf, buflen, "PEM - Failed to allocate memory" );
          if( use_ret == -(MBEDTLS_ERR_PEM_INVALID_ENC_IV) )
              mbedtls_snprintf( buf, buflen, "PEM - RSA IV is not in hex-format" );
          if( use_ret == -(MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG) )
              mbedtls_snprintf( buf, buflen, "PEM - Unsupported key encryption algorithm" );
          if( use_ret == -(MBEDTLS_ERR_PEM_PASSWORD_REQUIRED) )
              mbedtls_snprintf( buf, buflen, "PEM - Private key password can't be empty" );
          if( use_ret == -(MBEDTLS_ERR_PEM_PASSWORD_MISMATCH) )
              mbedtls_snprintf( buf, buflen, "PEM - Given private key password does not allow for correct decryption" );
          if( use_ret == -(MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE) )
              mbedtls_snprintf( buf, buflen, "PEM - Unavailable feature, e.g. hashing/encryption combination" );
          if( use_ret == -(MBEDTLS_ERR_PEM_BAD_INPUT_DATA) )
              mbedtls_snprintf( buf, buflen, "PEM - Bad input parameters to function" );
  #endif /* MBEDTLS_PEM_PARSE_C || MBEDTLS_PEM_WRITE_C */
  
  #if defined(MBEDTLS_PK_C)
          if( use_ret == -(MBEDTLS_ERR_PK_ALLOC_FAILED) )
              mbedtls_snprintf( buf, buflen, "PK - Memory allocation failed" );
          if( use_ret == -(MBEDTLS_ERR_PK_TYPE_MISMATCH) )
              mbedtls_snprintf( buf, buflen, "PK - Type mismatch, eg attempt to encrypt with an ECDSA key" );
          if( use_ret == -(MBEDTLS_ERR_PK_BAD_INPUT_DATA) )
              mbedtls_snprintf( buf, buflen, "PK - Bad input parameters to function" );
          if( use_ret == -(MBEDTLS_ERR_PK_FILE_IO_ERROR) )
              mbedtls_snprintf( buf, buflen, "PK - Read/write of file failed" );
          if( use_ret == -(MBEDTLS_ERR_PK_KEY_INVALID_VERSION) )
              mbedtls_snprintf( buf, buflen, "PK - Unsupported key version" );
          if( use_ret == -(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT) )
              mbedtls_snprintf( buf, buflen, "PK - Invalid key tag or value" );
          if( use_ret == -(MBEDTLS_ERR_PK_UNKNOWN_PK_ALG) )
              mbedtls_snprintf( buf, buflen, "PK - Key algorithm is unsupported (only RSA and EC are supported)" );
          if( use_ret == -(MBEDTLS_ERR_PK_PASSWORD_REQUIRED) )
              mbedtls_snprintf( buf, buflen, "PK - Private key password can't be empty" );
          if( use_ret == -(MBEDTLS_ERR_PK_PASSWORD_MISMATCH) )
              mbedtls_snprintf( buf, buflen, "PK - Given private key password does not allow for correct decryption" );
          if( use_ret == -(MBEDTLS_ERR_PK_INVALID_PUBKEY) )
              mbedtls_snprintf( buf, buflen, "PK - The pubkey tag or value is invalid (only RSA and EC are supported)" );
          if( use_ret == -(MBEDTLS_ERR_PK_INVALID_ALG) )
              mbedtls_snprintf( buf, buflen, "PK - The algorithm tag or value is invalid" );
          if( use_ret == -(MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE) )
              mbedtls_snprintf( buf, buflen, "PK - Elliptic curve is unsupported (only NIST curves are supported)" );
          if( use_ret == -(MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE) )
              mbedtls_snprintf( buf, buflen, "PK - Unavailable feature, e.g. RSA disabled for RSA key" );
          if( use_ret == -(MBEDTLS_ERR_PK_SIG_LEN_MISMATCH) )
              mbedtls_snprintf( buf, buflen, "PK - The buffer contains a valid signature followed by more data" );
          if( use_ret == -(MBEDTLS_ERR_PK_HW_ACCEL_FAILED) )
              mbedtls_snprintf( buf, buflen, "PK - PK hardware accelerator failed" );
  #endif /* MBEDTLS_PK_C */
  
  #if defined(MBEDTLS_PKCS12_C)
          if( use_ret == -(MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA) )
              mbedtls_snprintf( buf, buflen, "PKCS12 - Bad input parameters to function" );
          if( use_ret == -(MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE) )
              mbedtls_snprintf( buf, buflen, "PKCS12 - Feature not available, e.g. unsupported encryption scheme" );
          if( use_ret == -(MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT) )
              mbedtls_snprintf( buf, buflen, "PKCS12 - PBE ASN.1 data not as expected" );
          if( use_ret == -(MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH) )
              mbedtls_snprintf( buf, buflen, "PKCS12 - Given private key password does not allow for correct decryption" );
  #endif /* MBEDTLS_PKCS12_C */
  
  #if defined(MBEDTLS_PKCS5_C)
          if( use_ret == -(MBEDTLS_ERR_PKCS5_BAD_INPUT_DATA) )
              mbedtls_snprintf( buf, buflen, "PKCS5 - Bad input parameters to function" );
          if( use_ret == -(MBEDTLS_ERR_PKCS5_INVALID_FORMAT) )
              mbedtls_snprintf( buf, buflen, "PKCS5 - Unexpected ASN.1 data" );
          if( use_ret == -(MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE) )
              mbedtls_snprintf( buf, buflen, "PKCS5 - Requested encryption or digest alg not available" );
          if( use_ret == -(MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH) )
              mbedtls_snprintf( buf, buflen, "PKCS5 - Given private key password does not allow for correct decryption" );
  #endif /* MBEDTLS_PKCS5_C */
  
  #if defined(MBEDTLS_RSA_C)
          if( use_ret == -(MBEDTLS_ERR_RSA_BAD_INPUT_DATA) )
              mbedtls_snprintf( buf, buflen, "RSA - Bad input parameters to function" );
          if( use_ret == -(MBEDTLS_ERR_RSA_INVALID_PADDING) )
              mbedtls_snprintf( buf, buflen, "RSA - Input data contains invalid padding and is rejected" );
          if( use_ret == -(MBEDTLS_ERR_RSA_KEY_GEN_FAILED) )
              mbedtls_snprintf( buf, buflen, "RSA - Something failed during generation of a key" );
          if( use_ret == -(MBEDTLS_ERR_RSA_KEY_CHECK_FAILED) )
              mbedtls_snprintf( buf, buflen, "RSA - Key failed to pass the validity check of the library" );
          if( use_ret == -(MBEDTLS_ERR_RSA_PUBLIC_FAILED) )
              mbedtls_snprintf( buf, buflen, "RSA - The public key operation failed" );
          if( use_ret == -(MBEDTLS_ERR_RSA_PRIVATE_FAILED) )
              mbedtls_snprintf( buf, buflen, "RSA - The private key operation failed" );
          if( use_ret == -(MBEDTLS_ERR_RSA_VERIFY_FAILED) )
              mbedtls_snprintf( buf, buflen, "RSA - The PKCS#1 verification failed" );
          if( use_ret == -(MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE) )
              mbedtls_snprintf( buf, buflen, "RSA - The output buffer for decryption is not large enough" );
          if( use_ret == -(MBEDTLS_ERR_RSA_RNG_FAILED) )
              mbedtls_snprintf( buf, buflen, "RSA - The random generator failed to generate non-zeros" );
          if( use_ret == -(MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION) )
              mbedtls_snprintf( buf, buflen, "RSA - The implementation does not offer the requested operation, for example, because of security violations or lack of functionality" );
          if( use_ret == -(MBEDTLS_ERR_RSA_HW_ACCEL_FAILED) )
              mbedtls_snprintf( buf, buflen, "RSA - RSA hardware accelerator failed" );
  #endif /* MBEDTLS_RSA_C */
          // END generated code
  
          if( strlen( buf ) == 0 )
              mbedtls_snprintf( buf, buflen, "UNKNOWN ERROR CODE (%04X)", use_ret );
      }
  
      use_ret = ret & ~0xFF80;
  
      if( use_ret == 0 )
          return;
  
      // If high level code is present, make a concatenation between both
      // error strings.
      //
      len = strlen( buf );
  
      if( len > 0 )
      {
          if( buflen - len < 5 )
              return;
  
          mbedtls_snprintf( buf + len, buflen - len, " : " );
  
          buf += len + 3;
          buflen -= len + 3;
      }
  
      // Low level error codes
      //
      // BEGIN generated code
  #if defined(MBEDTLS_AES_C)
      if( use_ret == -(MBEDTLS_ERR_AES_INVALID_KEY_LENGTH) )
          mbedtls_snprintf( buf, buflen, "AES - Invalid key length" );
      if( use_ret == -(MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH) )
          mbedtls_snprintf( buf, buflen, "AES - Invalid data input length" );
      if( use_ret == -(MBEDTLS_ERR_AES_BAD_INPUT_DATA) )
          mbedtls_snprintf( buf, buflen, "AES - Invalid input data" );
      if( use_ret == -(MBEDTLS_ERR_AES_FEATURE_UNAVAILABLE) )
          mbedtls_snprintf( buf, buflen, "AES - Feature not available. For example, an unsupported AES key size" );
      if( use_ret == -(MBEDTLS_ERR_AES_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "AES - AES hardware accelerator failed" );
  #endif /* MBEDTLS_AES_C */
  
  #if defined(MBEDTLS_ARC4_C)
      if( use_ret == -(MBEDTLS_ERR_ARC4_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "ARC4 - ARC4 hardware accelerator failed" );
  #endif /* MBEDTLS_ARC4_C */
  
  #if defined(MBEDTLS_ARIA_C)
      if( use_ret == -(MBEDTLS_ERR_ARIA_BAD_INPUT_DATA) )
          mbedtls_snprintf( buf, buflen, "ARIA - Bad input data" );
      if( use_ret == -(MBEDTLS_ERR_ARIA_INVALID_INPUT_LENGTH) )
          mbedtls_snprintf( buf, buflen, "ARIA - Invalid data input length" );
      if( use_ret == -(MBEDTLS_ERR_ARIA_FEATURE_UNAVAILABLE) )
          mbedtls_snprintf( buf, buflen, "ARIA - Feature not available. For example, an unsupported ARIA key size" );
      if( use_ret == -(MBEDTLS_ERR_ARIA_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "ARIA - ARIA hardware accelerator failed" );
  #endif /* MBEDTLS_ARIA_C */
  
  #if defined(MBEDTLS_ASN1_PARSE_C)
      if( use_ret == -(MBEDTLS_ERR_ASN1_OUT_OF_DATA) )
          mbedtls_snprintf( buf, buflen, "ASN1 - Out of data when parsing an ASN1 data structure" );
      if( use_ret == -(MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) )
          mbedtls_snprintf( buf, buflen, "ASN1 - ASN1 tag was of an unexpected value" );
      if( use_ret == -(MBEDTLS_ERR_ASN1_INVALID_LENGTH) )
          mbedtls_snprintf( buf, buflen, "ASN1 - Error when trying to determine the length or invalid length" );
      if( use_ret == -(MBEDTLS_ERR_ASN1_LENGTH_MISMATCH) )
          mbedtls_snprintf( buf, buflen, "ASN1 - Actual length differs from expected length" );
      if( use_ret == -(MBEDTLS_ERR_ASN1_INVALID_DATA) )
          mbedtls_snprintf( buf, buflen, "ASN1 - Data is invalid. (not used)" );
      if( use_ret == -(MBEDTLS_ERR_ASN1_ALLOC_FAILED) )
          mbedtls_snprintf( buf, buflen, "ASN1 - Memory allocation failed" );
      if( use_ret == -(MBEDTLS_ERR_ASN1_BUF_TOO_SMALL) )
          mbedtls_snprintf( buf, buflen, "ASN1 - Buffer too small when writing ASN.1 data structure" );
  #endif /* MBEDTLS_ASN1_PARSE_C */
  
  #if defined(MBEDTLS_BASE64_C)
      if( use_ret == -(MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL) )
          mbedtls_snprintf( buf, buflen, "BASE64 - Output buffer too small" );
      if( use_ret == -(MBEDTLS_ERR_BASE64_INVALID_CHARACTER) )
          mbedtls_snprintf( buf, buflen, "BASE64 - Invalid character in input" );
  #endif /* MBEDTLS_BASE64_C */
  
  #if defined(MBEDTLS_BIGNUM_C)
      if( use_ret == -(MBEDTLS_ERR_MPI_FILE_IO_ERROR) )
          mbedtls_snprintf( buf, buflen, "BIGNUM - An error occurred while reading from or writing to a file" );
      if( use_ret == -(MBEDTLS_ERR_MPI_BAD_INPUT_DATA) )
          mbedtls_snprintf( buf, buflen, "BIGNUM - Bad input parameters to function" );
      if( use_ret == -(MBEDTLS_ERR_MPI_INVALID_CHARACTER) )
          mbedtls_snprintf( buf, buflen, "BIGNUM - There is an invalid character in the digit string" );
      if( use_ret == -(MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL) )
          mbedtls_snprintf( buf, buflen, "BIGNUM - The buffer is too small to write to" );
      if( use_ret == -(MBEDTLS_ERR_MPI_NEGATIVE_VALUE) )
          mbedtls_snprintf( buf, buflen, "BIGNUM - The input arguments are negative or result in illegal output" );
      if( use_ret == -(MBEDTLS_ERR_MPI_DIVISION_BY_ZERO) )
          mbedtls_snprintf( buf, buflen, "BIGNUM - The input argument for division is zero, which is not allowed" );
      if( use_ret == -(MBEDTLS_ERR_MPI_NOT_ACCEPTABLE) )
          mbedtls_snprintf( buf, buflen, "BIGNUM - The input arguments are not acceptable" );
      if( use_ret == -(MBEDTLS_ERR_MPI_ALLOC_FAILED) )
          mbedtls_snprintf( buf, buflen, "BIGNUM - Memory allocation failed" );
  #endif /* MBEDTLS_BIGNUM_C */
  
  #if defined(MBEDTLS_BLOWFISH_C)
      if( use_ret == -(MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA) )
          mbedtls_snprintf( buf, buflen, "BLOWFISH - Bad input data" );
      if( use_ret == -(MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH) )
          mbedtls_snprintf( buf, buflen, "BLOWFISH - Invalid data input length" );
      if( use_ret == -(MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "BLOWFISH - Blowfish hardware accelerator failed" );
  #endif /* MBEDTLS_BLOWFISH_C */
  
  #if defined(MBEDTLS_CAMELLIA_C)
      if( use_ret == -(MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA) )
          mbedtls_snprintf( buf, buflen, "CAMELLIA - Bad input data" );
      if( use_ret == -(MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH) )
          mbedtls_snprintf( buf, buflen, "CAMELLIA - Invalid data input length" );
      if( use_ret == -(MBEDTLS_ERR_CAMELLIA_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "CAMELLIA - Camellia hardware accelerator failed" );
  #endif /* MBEDTLS_CAMELLIA_C */
  
  #if defined(MBEDTLS_CCM_C)
      if( use_ret == -(MBEDTLS_ERR_CCM_BAD_INPUT) )
          mbedtls_snprintf( buf, buflen, "CCM - Bad input parameters to the function" );
      if( use_ret == -(MBEDTLS_ERR_CCM_AUTH_FAILED) )
          mbedtls_snprintf( buf, buflen, "CCM - Authenticated decryption failed" );
      if( use_ret == -(MBEDTLS_ERR_CCM_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "CCM - CCM hardware accelerator failed" );
  #endif /* MBEDTLS_CCM_C */
  
  #if defined(MBEDTLS_CHACHA20_C)
      if( use_ret == -(MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA) )
          mbedtls_snprintf( buf, buflen, "CHACHA20 - Invalid input parameter(s)" );
      if( use_ret == -(MBEDTLS_ERR_CHACHA20_FEATURE_UNAVAILABLE) )
          mbedtls_snprintf( buf, buflen, "CHACHA20 - Feature not available. For example, s part of the API is not implemented" );
      if( use_ret == -(MBEDTLS_ERR_CHACHA20_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "CHACHA20 - Chacha20 hardware accelerator failed" );
  #endif /* MBEDTLS_CHACHA20_C */
  
  #if defined(MBEDTLS_CHACHAPOLY_C)
      if( use_ret == -(MBEDTLS_ERR_CHACHAPOLY_BAD_STATE) )
          mbedtls_snprintf( buf, buflen, "CHACHAPOLY - The requested operation is not permitted in the current state" );
      if( use_ret == -(MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED) )
          mbedtls_snprintf( buf, buflen, "CHACHAPOLY - Authenticated decryption failed: data was not authentic" );
  #endif /* MBEDTLS_CHACHAPOLY_C */
  
  #if defined(MBEDTLS_CMAC_C)
      if( use_ret == -(MBEDTLS_ERR_CMAC_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "CMAC - CMAC hardware accelerator failed" );
  #endif /* MBEDTLS_CMAC_C */
  
  #if defined(MBEDTLS_CTR_DRBG_C)
      if( use_ret == -(MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED) )
          mbedtls_snprintf( buf, buflen, "CTR_DRBG - The entropy source failed" );
      if( use_ret == -(MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG) )
          mbedtls_snprintf( buf, buflen, "CTR_DRBG - The requested random buffer length is too big" );
      if( use_ret == -(MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG) )
          mbedtls_snprintf( buf, buflen, "CTR_DRBG - The input (entropy + additional data) is too large" );
      if( use_ret == -(MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR) )
          mbedtls_snprintf( buf, buflen, "CTR_DRBG - Read or write error in file" );
  #endif /* MBEDTLS_CTR_DRBG_C */
  
  #if defined(MBEDTLS_DES_C)
      if( use_ret == -(MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH) )
          mbedtls_snprintf( buf, buflen, "DES - The data input has an invalid length" );
      if( use_ret == -(MBEDTLS_ERR_DES_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "DES - DES hardware accelerator failed" );
  #endif /* MBEDTLS_DES_C */
  
  #if defined(MBEDTLS_ENTROPY_C)
      if( use_ret == -(MBEDTLS_ERR_ENTROPY_SOURCE_FAILED) )
          mbedtls_snprintf( buf, buflen, "ENTROPY - Critical entropy source failure" );
      if( use_ret == -(MBEDTLS_ERR_ENTROPY_MAX_SOURCES) )
          mbedtls_snprintf( buf, buflen, "ENTROPY - No more sources can be added" );
      if( use_ret == -(MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED) )
          mbedtls_snprintf( buf, buflen, "ENTROPY - No sources have been added to poll" );
      if( use_ret == -(MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE) )
          mbedtls_snprintf( buf, buflen, "ENTROPY - No strong sources have been added to poll" );
      if( use_ret == -(MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR) )
          mbedtls_snprintf( buf, buflen, "ENTROPY - Read/write error in file" );
  #endif /* MBEDTLS_ENTROPY_C */
  
  #if defined(MBEDTLS_GCM_C)
      if( use_ret == -(MBEDTLS_ERR_GCM_AUTH_FAILED) )
          mbedtls_snprintf( buf, buflen, "GCM - Authenticated decryption failed" );
      if( use_ret == -(MBEDTLS_ERR_GCM_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "GCM - GCM hardware accelerator failed" );
      if( use_ret == -(MBEDTLS_ERR_GCM_BAD_INPUT) )
          mbedtls_snprintf( buf, buflen, "GCM - Bad input parameters to function" );
  #endif /* MBEDTLS_GCM_C */
  
  #if defined(MBEDTLS_HKDF_C)
      if( use_ret == -(MBEDTLS_ERR_HKDF_BAD_INPUT_DATA) )
          mbedtls_snprintf( buf, buflen, "HKDF - Bad input parameters to function" );
  #endif /* MBEDTLS_HKDF_C */
  
  #if defined(MBEDTLS_HMAC_DRBG_C)
      if( use_ret == -(MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG) )
          mbedtls_snprintf( buf, buflen, "HMAC_DRBG - Too many random requested in single call" );
      if( use_ret == -(MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG) )
          mbedtls_snprintf( buf, buflen, "HMAC_DRBG - Input too large (Entropy + additional)" );
      if( use_ret == -(MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR) )
          mbedtls_snprintf( buf, buflen, "HMAC_DRBG - Read/write error in file" );
      if( use_ret == -(MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED) )
          mbedtls_snprintf( buf, buflen, "HMAC_DRBG - The entropy source failed" );
  #endif /* MBEDTLS_HMAC_DRBG_C */
  
  #if defined(MBEDTLS_MD2_C)
      if( use_ret == -(MBEDTLS_ERR_MD2_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "MD2 - MD2 hardware accelerator failed" );
  #endif /* MBEDTLS_MD2_C */
  
  #if defined(MBEDTLS_MD4_C)
      if( use_ret == -(MBEDTLS_ERR_MD4_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "MD4 - MD4 hardware accelerator failed" );
  #endif /* MBEDTLS_MD4_C */
  
  #if defined(MBEDTLS_MD5_C)
      if( use_ret == -(MBEDTLS_ERR_MD5_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "MD5 - MD5 hardware accelerator failed" );
  #endif /* MBEDTLS_MD5_C */
  
  #if defined(MBEDTLS_OID_C)
      if( use_ret == -(MBEDTLS_ERR_OID_NOT_FOUND) )
          mbedtls_snprintf( buf, buflen, "OID - OID is not found" );
      if( use_ret == -(MBEDTLS_ERR_OID_BUF_TOO_SMALL) )
          mbedtls_snprintf( buf, buflen, "OID - output buffer is too small" );
  #endif /* MBEDTLS_OID_C */
  
  #if defined(MBEDTLS_PADLOCK_C)
      if( use_ret == -(MBEDTLS_ERR_PADLOCK_DATA_MISALIGNED) )
          mbedtls_snprintf( buf, buflen, "PADLOCK - Input data should be aligned" );
  #endif /* MBEDTLS_PADLOCK_C */
  
  #if defined(MBEDTLS_PLATFORM_C)
      if( use_ret == -(MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "PLATFORM - Hardware accelerator failed" );
      if( use_ret == -(MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED) )
          mbedtls_snprintf( buf, buflen, "PLATFORM - The requested feature is not supported by the platform" );
  #endif /* MBEDTLS_PLATFORM_C */
  
  #if defined(MBEDTLS_POLY1305_C)
      if( use_ret == -(MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA) )
          mbedtls_snprintf( buf, buflen, "POLY1305 - Invalid input parameter(s)" );
      if( use_ret == -(MBEDTLS_ERR_POLY1305_FEATURE_UNAVAILABLE) )
          mbedtls_snprintf( buf, buflen, "POLY1305 - Feature not available. For example, s part of the API is not implemented" );
      if( use_ret == -(MBEDTLS_ERR_POLY1305_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "POLY1305 - Poly1305 hardware accelerator failed" );
  #endif /* MBEDTLS_POLY1305_C */
  
  #if defined(MBEDTLS_RIPEMD160_C)
      if( use_ret == -(MBEDTLS_ERR_RIPEMD160_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "RIPEMD160 - RIPEMD160 hardware accelerator failed" );
  #endif /* MBEDTLS_RIPEMD160_C */
  
  #if defined(MBEDTLS_SHA1_C)
      if( use_ret == -(MBEDTLS_ERR_SHA1_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "SHA1 - SHA-1 hardware accelerator failed" );
      if( use_ret == -(MBEDTLS_ERR_SHA1_BAD_INPUT_DATA) )
          mbedtls_snprintf( buf, buflen, "SHA1 - SHA-1 input data was malformed" );
  #endif /* MBEDTLS_SHA1_C */
  
  #if defined(MBEDTLS_SHA256_C)
      if( use_ret == -(MBEDTLS_ERR_SHA256_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "SHA256 - SHA-256 hardware accelerator failed" );
      if( use_ret == -(MBEDTLS_ERR_SHA256_BAD_INPUT_DATA) )
          mbedtls_snprintf( buf, buflen, "SHA256 - SHA-256 input data was malformed" );
  #endif /* MBEDTLS_SHA256_C */
  
  #if defined(MBEDTLS_SHA512_C)
      if( use_ret == -(MBEDTLS_ERR_SHA512_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "SHA512 - SHA-512 hardware accelerator failed" );
      if( use_ret == -(MBEDTLS_ERR_SHA512_BAD_INPUT_DATA) )
          mbedtls_snprintf( buf, buflen, "SHA512 - SHA-512 input data was malformed" );
  #endif /* MBEDTLS_SHA512_C */
  
  #if defined(MBEDTLS_THREADING_C)
      if( use_ret == -(MBEDTLS_ERR_THREADING_FEATURE_UNAVAILABLE) )
          mbedtls_snprintf( buf, buflen, "THREADING - The selected feature is not available" );
      if( use_ret == -(MBEDTLS_ERR_THREADING_BAD_INPUT_DATA) )
          mbedtls_snprintf( buf, buflen, "THREADING - Bad input parameters to function" );
      if( use_ret == -(MBEDTLS_ERR_THREADING_MUTEX_ERROR) )
          mbedtls_snprintf( buf, buflen, "THREADING - Locking / unlocking / free failed with error code" );
  #endif /* MBEDTLS_THREADING_C */
  
  #if defined(MBEDTLS_XTEA_C)
      if( use_ret == -(MBEDTLS_ERR_XTEA_INVALID_INPUT_LENGTH) )
          mbedtls_snprintf( buf, buflen, "XTEA - The data input has an invalid length" );
      if( use_ret == -(MBEDTLS_ERR_XTEA_HW_ACCEL_FAILED) )
          mbedtls_snprintf( buf, buflen, "XTEA - XTEA hardware accelerator failed" );
  #endif /* MBEDTLS_XTEA_C */
      // END generated code
  
      if( strlen( buf ) != 0 )
          return;
  
      mbedtls_snprintf( buf, buflen, "UNKNOWN ERROR CODE (%04X)", use_ret );
  }
  
  #else /* MBEDTLS_ERROR_C */
  
  #if defined(MBEDTLS_ERROR_STRERROR_DUMMY)
  
  /*
   * Provide an non-function in case MBEDTLS_ERROR_C is not defined
   */
  void mbedtls_strerror( int ret, char *buf, size_t buflen )
  {
      ((void) ret);
  
      if( buflen > 0 )
          buf[0] = '\0';
  }
  
  #endif /* MBEDTLS_ERROR_STRERROR_DUMMY */
  
  #endif /* MBEDTLS_ERROR_C */
  