aes加密字符串 openssl_openssl AES加密以及padding

好习惯，先上代码再说事

加密

void AesEncrypt(unsigned char* pchIn, int nInLen, unsigned char *ciphertext, int &ciphertext_len, unsigned char * pchKey)

{

EVP_CIPHER_CTX en;

EVP_CIPHER_CTX_init(&en);

const EVP_CIPHER *cipher_type;

unsigned char *passkey, *passiv, *plaintxt;

unsigned char *plaintext = NULL;

unsigned char iv[] = { 0x00};

cipher_type = EVP_aes_128_ecb();

EVP_EncryptInit_ex(&en, cipher_type, NULL, pchKey, iv);

//当长度正好为16字节的倍数时，同样需要padding

static const int MAX_PADDING_LEN = 16;

if(!EVP_EncryptInit_ex(&en, NULL, NULL, NULL, NULL))

{

printf("ERROR in EVP_EncryptInit_ex \n");

return;

}

int bytes_written = 0;

ciphertext_len = 0;

if(!EVP_EncryptUpdate(&en, ciphertext, &bytes_written, (unsigned char *) pchIn, nInLen) )

{

printf("ERROR in EVP_EncryptUpdate \n");

return;

}

ciphertext_len += bytes_written;

if(!EVP_EncryptFinal_ex(&en, ciphertext + bytes_written, &bytes_written))

{

printf("ERROR in EVP_EncryptFinal_ex \n");

return;

}

ciphertext_len += bytes_written;

ciphertext[ciphertext_len] = 0;

EVP_CIPHER_CTX_cleanup(&en);

return;

}

解密

void AesDecrypt