stm32F103 aes ctr到底是怎么回事？

ken_770304 · 发表于 2016-9-18 18:58:56

各位大侠好，我有个关于STM32 密码库的问题问大家，我是从ST的官网上下载的AES加密库，其中用到AES_CTR 方式用于加密从USART收发的指令，芯片用STM32F103VET6，加密库是STM32 Cryptographic library package V2.0.6，自己定义了KEY和IV，我的明文长度超过15个字节加密还原就出错了，请问是什么原因？另外可以提供或者提供链接关于在安卓平台或者windows平台的AES库吗？在网上找的ECB方式可以正确加密还原，CTR方式就不对。

void Encryption_CTR(const uint8_t* plaintext,\
      uint8_t* ciphertext,\
      const uint8_t* key,\
      const uint8_t* iv,\
      const uint16_t len)
{
  // outSize is for output size, retval is for return value
int32_t outSize, retval;
  AESCTRctx_stt AESctx_st; // The AES context
// Initialize Context Flag with default value
  AESctx_st.mFlags = E_SK_DEFAULT;
// Set Iv size to 16
  AESctx_st.mIvSize=16;
// Set key size to 16
  AESctx_st.mKeySize=CRL_AES128_KEY;
// call init function
  retval = AES_CTR_Encrypt_Init(&AESctx_st, key, iv);
  if (retval != AES_SUCCESS)
  {  }

  retval = AES_CTR_Encrypt_Append(&AESctx_st, plaintext, len, ciphertext, &outSize);
  if (retval != AES_SUCCESS)
  { }

  //Do the finalization call (in CTR it will not return any output)
  retval = AES_CTR_Encrypt_Finish(&AESctx_st, ciphertext+outSize, &outSize );
  if (retval != AES_SUCCESS)
  { }
}
/**
  * @brief
  * @param
  * @retval None
  */
void Decryption_CTR(uint8_t* plaintext,\
      const uint8_t* ciphertext,\
      const uint8_t* key,\
      const uint8_t* iv,\
      const uint16_t len)
{
  // outSize is for output size, retval is for return value
int32_t outSize, retval;
  AESCTRctx_stt AESctx_st; // The AES context
// Initialize Context Flag with default value
  AESctx_st.mFlags = E_SK_DEFAULT;
// Set Iv size to 16
  AESctx_st.mIvSize=16;
// Set key size to 16
  AESctx_st.mKeySize=CRL_AES128_KEY;
// call init function
  retval = AES_CTR_Decrypt_Init(&AESctx_st, key, iv);
  if (retval != AES_SUCCESS)
  {  }

  retval = AES_CTR_Decrypt_Append(&AESctx_st, ciphertext, len, plaintext, &outSize);
  if (retval != AES_SUCCESS)
  { }

  //Do the finalization call (in CTR it will not return any output)
  retval = AES_CTR_Decrypt_Finish(&AESctx_st, plaintext+outSize, &outSize );
  if (retval != AES_SUCCESS)
  { }
}