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

 1     char encrypt_string[4096] = { 0 };
 2     AES_KEY aes;
 3     char key[17] = "quck7295abvdefgh";
 4     char iv[17] = "abcdefgh3762quck";
 5     std::string input_string = "45b00417-f7ca-4f53-bced-c1743d85604";
 6     int nLen = input_string.length();
 7
 8     int nBei = nLen / AES_BLOCK_SIZE + 1;
 9     int nTotal = nBei * AES_BLOCK_SIZE;
10     char *enc_s = (char*)malloc(nTotal);
11     int nNumber;
12     if (nLen % 16 > 0)
13         nNumber = nTotal - nLen;
14     else
15         nNumber = 16;
16     memset(enc_s, nNumber, nTotal);
17     memcpy(enc_s, input_string.data(), nLen);
18
19     if (AES_set_encrypt_key((unsigned char*)key, 128, &aes) < 0) {
20         fprintf(stderr, "Unable to set encryption key in AES\n");
21         exit(-1);
22     }
23
24     AES_cbc_encrypt((unsigned char *)enc_s, (unsigned char*)encrypt_string, nBei * 16, &aes, (unsigned char*)iv, AES_ENCRYPT);
25
26
27     std::string enstr = boost::lexical_cast<std::string>(encrypt_string);
28     std::string base64 = base64_encode(enstr);
29
30     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。