openssl c AES/CBC/PKCS5Padding 与java代码对应

    char encrypt_string[4096] = { 0 };
    AES_KEY aes;
    char key[17] = "quck7295abvdefgh";
    char iv[17] = "abcdefgh3762quck";
    std::string input_string = "45b00417-f7ca-4f53-bced-c1743d85604";
    int nLen = input_string.length();

    int nBei = nLen / AES_BLOCK_SIZE + 1;
    int nTotal = nBei * AES_BLOCK_SIZE;
    char *enc_s = (char*)malloc(nTotal);
    int nNumber;
    if (nLen % 16 > 0)
        nNumber = nTotal - nLen;
    else
        nNumber = 16;
    memset(enc_s, nNumber, nTotal);
    memcpy(enc_s, input_string.data(), nLen);

    if (AES_set_encrypt_key((unsigned char*)key, 128, &aes) < 0) {
        fprintf(stderr, "Unable to set encryption key in AES
");
        exit(-1);
    }
    
    AES_cbc_encrypt((unsigned char *)enc_s, (unsigned char*)encrypt_string, nBei * 16, &aes, (unsigned char*)iv, AES_ENCRYPT);


    std::string enstr = boost::lexical_cast<std::string>(encrypt_string);
    std::string base64 = base64_encode(enstr);

    std::cout << base64 << std::endl;

KCS5Padding：填充的原则是，如果长度少于16个字节，需要补满16个字节，补(16-len)个(16-len)例如：

huguPozhen这个节符串是9个字节，16-9= 7,补满后如：huguozhen+7个十进制的7

如果字符串长度正好是16字节，则需要再补16个字节的十进制的16。