Function AESEncrypt

mars/openssl/export/crypto/iCoreCrypt.cpp:991–1038

//�ͻ��˲ü�����evp�ӿڣ�����ֻ�ڷ���������ʹ��evp�ӿڵİ汾

int AESEncrypt(const unsigned char* pInput, unsigned int uiInputLen,std::string* rbOutput,
               const char* pKey, unsigned int uiKeyLen) {
    if (!pInput || !pKey || !rbOutput)
    {
        return CRYPT_ERR_INVALID_PARAM;
    }

    //EVP �ӿڻᱣ֤ʹ��ƽ̨���е�����ѧ���٣�����AES-NI
    const EVP_CIPHER *cipher = EVP_aes_128_cbc();

    EVP_CIPHER_CTX ctx;
    EVP_CIPHER_CTX_init(&ctx);
    EVP_CIPHER_CTX_set_padding(&ctx,1);//ʹ��pkcs padding

    unsigned char key[16], iv[16]; //aes_128�� key size=128bit , iv size=128bit
    memset(key, 0, sizeof(key));
    memset(iv, 0, sizeof(iv));
    memcpy(key, pKey, uiKeyLen > 16U ? 16U : uiKeyLen);
    memcpy(iv, key, sizeof(key));
    bool ret=CRYPT_ERR_NO_MEMORY;
    do{
        if(1 != EVP_EncryptInit_ex(&ctx, cipher, NULL, key, iv)){
            break;
        }

        rbOutput->assign(uiInputLen + EVP_CIPHER_block_size(cipher),0);
        int len=rbOutput->size();
        int ciphertext_len=0;

        if(1 != EVP_EncryptUpdate(&ctx, (unsigned char *) &(*rbOutput)[0], &len, pInput, uiInputLen)){
            break;
        }
        ciphertext_len = len;

        if(1 != EVP_EncryptFinal_ex(&ctx, (unsigned char *) &(*rbOutput)[0] + len, &len)){
            break;
        }
        ciphertext_len += len;
        rbOutput->resize(ciphertext_len);
        ret=CRYPT_OK;
    }while(0);

    /* Clean up */
    OPENSSL_cleanse(key,sizeof(key));
    OPENSSL_cleanse(iv,sizeof(iv));
    EVP_CIPHER_CTX_cleanup(&ctx);
    return ret;
}

int AESDecrypt(const unsigned char* pInput, unsigned int uiInputLen, std::string* sOutput,
               const char* pKey, unsigned int uiKeyLen) {