Java DESede 加密，OpenSSL 等效

Question

我在 Java 中使用 DESede 加密，我想在 C++ 中使用 OpenSSL 的 API 进行相同的加密。

Java代码:

    String secretKey = "abcdefghijklmnopqrstuvwx";

    byte[] bytes = secretKey.getBytes("UTF-8");
    SecretKey key = new SecretKeySpec(bytes, "DESede");

    Cipher ecipher = Cipher.getInstance("DESede");
    ecipher.init(Cipher.ENCRYPT_MODE, key);

    String input = "holahola1"; 

    byte[] utf8 = input.getBytes("UTF8");
    byte[] enc = ecipher.doFinal(utf8); // Encrypt

输出:[94, -45, 64, -105, 99, -55, 99, -42, 95, 122, 72, 117, -119, 95, -43, 40]

C++代码:

    unsigned char intext[256], outtext[256];

    memset(intext, 0, sizeof(intext));
    memset(outtext, 0, sizeof(outtext));

    char *output = (char *)outtext;
    DES_key_schedule keyschedc1;
    DES_key_schedule keyschedc2;
    DES_key_schedule keyschedc3;
    DES_cblock keyc1;
    DES_cblock keyc2;
    DES_cblock keyc3;

    DES_string_to_key("abcdefgh", &keyc1);
    DES_string_to_key("ijklmnop", &keyc2);
    DES_string_to_key("qrstuvwx", &keyc3);
    DES_set_key((DES_cblock *)keyc1, &keyschedc1);
    DES_set_key((DES_cblock *)keyc2, &keyschedc2);
    DES_set_key((DES_cblock *)keyc3, &keyschedc3); 

    strcpy((char *)intext, "holahola1");

    for (int i=0; i<16; i += 8)
    {
        DES_ecb3_encrypt((DES_cblock *)(intext + i),
                        (DES_cblock *)(outtext + i), 
                        &keyschedc1, &keyschedc2, 
                        &keyschedc3,DES_ENCRYPT);
    }              

输出:[30 55 9 -58 -18 -65 -66 123 -32 72 30 110 120 69 101 -81]

怎么了？有人能帮我吗？谢谢!

Answer 1

我明白了。 Java DESede 加密，使用带 ecb 模式的三重 DES，并使用 PKCS#5 填充。因此，我使用 PKCS#5 填充我的文本，它解决了所有问题。

示例 C++ 代码:

unsigned char intext[256], outtext[256];

memset(intext, 0x07, sizeof(intext)); //PKCS#5 padding (See documentation)
memset(outtext, 0, sizeof(outtext));
char *output = (char *)outtext;

DES_key_schedule keyschedc1;
DES_key_schedule keyschedc2;
DES_key_schedule keyschedc3;
DES_cblock keyc1;
DES_cblock keyc2;
DES_cblock keyc3;

DES_set_key((DES_cblock *)"abcdefgh", &keyschedc1);
DES_set_key((DES_cblock *)"ijklmnop", &keyschedc2);
DES_set_key((DES_cblock *)"qrstuvwx", &keyschedc3); 

strcpy((char *)intext, "holahola1");

for (int i=0; i<16; i += 8)
{
    DES_ecb3_encrypt((DES_cblock *)(intext + i),
                    (DES_cblock *)(outtext + i), 
                    &keyschedc1, &keyschedc2, 
                    &keyschedc3,DES_ENCRYPT);
}