526互联

实验二 OpenSSL API使用

发布时间 2023-10-20 11:08:37作者: LLLZT

sm3代码

#include <stdio.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/rand.h>

void handleErrors(void)
{
    ERR_print_errors_fp(stderr);
    abort();
}

void test_sm3()
{
    unsigned char data[] = "Hello, SM3!";
    unsigned char digest[EVP_MAX_MD_SIZE];
    unsigned int digest_len;

    EVP_MD_CTX *mdctx;

    mdctx = EVP_MD_CTX_new();
    if (mdctx == NULL)
        handleErrors();

    if (EVP_DigestInit_ex(mdctx, EVP_sm3(), NULL) != 1)
        handleErrors();

    if (EVP_DigestUpdate(mdctx, data, sizeof(data) - 1) != 1)
        handleErrors();

    if (EVP_DigestFinal_ex(mdctx, digest, &digest_len) != 1)
        handleErrors();

    EVP_MD_CTX_free(mdctx);

    printf("SM3 Digest: ");
    for (unsigned int i = 0; i < digest_len; i++)
        printf("%02x", digest[i]);
    printf("\n");
}

sm4代码

  GNU nano 4.8                                    sm4_test.c                                            
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/evp.h>

void handleErrors(void)
{
    fprintf(stderr, "Error occurred\n");
    exit(1);
}

void test_sm4(const unsigned char *key, const unsigned char *plaintext)
{
    EVP_CIPHER_CTX *ctx;
    unsigned char ciphertext[128];
    int len;

    // Create and initialize the context
    ctx = EVP_CIPHER_CTX_new();
    if (!ctx)
        handleErrors();

    // Encrypt the plaintext using SM4 in CBC mode
    if (EVP_EncryptInit_ex(ctx, EVP_sm4_cbc(), NULL, key, NULL) != 1)
        handleErrors();

    if (EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, strlen((char *)plaintext)) != 1)
        handleErrors();

    if (EVP_EncryptFinal_ex(ctx, ciphertext + len, &len) != 1)
        handleErrors();

    EVP_CIPHER_CTX_free(ctx);

    printf("SM4 Ciphertext: ");
    for (int i = 0; i < len + strlen((char *)plaintext); i++)
        printf("%02x", ciphertext[i]);
    printf("\n");
}

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