OpenSSL如何进行DES加密

OpenSSL??????????,???????????????,??DES????????OpenSSL??DES???????:

??OpenSSL???????DES??

1. ????

   • ??openssl des3??????DES?????

     openssl des3 -salt -in plaintext.txt -out encrypted.bin -pass pass:yourpassword
     

   • -salt?????????????
   • -in plaintext.txt???????
   • -out encrypted.bin????????????
   • -pass pass:yourpassword???????

2. ????

   • ??????????????????????,????????:

     openssl des3 -salt -in plaintext.txt -out encrypted.bin -pass pass:yourpassword
     

3. ????

   • ?????????,???????des3???des3 -d:

     openssl des3 -d -salt -in encrypted.bin -out decrypted.txt -pass pass:yourpassword
     

??OpenSSL??????DES??

???????????OpenSSL???DES??,??????C????:

#include 
#include 
#include 
#include 

void des_encrypt(const char *key, const char *input, char *output) {
    DES_cblock key_block;
    DES_key_schedule schedule;
    DES_cblock input_block;
    DES_cblock output_block;

    // ??????DES_cblock
    memcpy(key_block, key, 8);

    // ?????????
    DES_set_key_unchecked(&key_block, &schedule);

    // ????????DES_cblock
    memcpy(input_block, input, 8);

    // ??DES??
    DES_ecb_encrypt(&input_block, &output_block, &schedule, DES_ENCRYPT);

    // ???????????????
    memcpy(output, output_block, 8);
}

int main() {
    const char *key = "12345678"; // DES?????8???
    const char *input = "HelloW";
    char output[9]; // ?????,?????

    des_encrypt(key, input, output);

    printf("Encrypted: ");
    for (int i = 0; i < 8; i++) {
        printf("x", (unsigned char)output[i]);
    }
    printf("\n");

    return 0;
}

????

• DES????????????,?????56?????????????????,?AES?
• ??????,????????,??????????????
• ??OpenSSL??,???????????OpenSSL????

??????,?????OpenSSL??DES????????