第三题

准备过程：

 

 

 

配置LD_LIBRARY_PATH并检查openssl可执行程序版本号

 

检查 SM3 哈希校验和

 

 

检查椭圆曲线是否包含SM2

 

检查对称算法

 

 

SM4-自测试数据

 

/** 文件名: https://github.com/liuqun/openssl-sm4-demo/blob/cmake/src/main.c */
 
#include <stddef.h>
 
#include <stdio.h>
 
#include <stdlib.h>
 
#include <string.h>
 
#include "openssl/err.h"
 
#include "openssl/evp.h"
 
 
 
/* Before OpenSSL 1.1.1-pre1, we did not have EVP_sm4_ecb() */
 
#if defined(OPENSSL_VERSION_NUMBER) \
 
    && OPENSSL_VERSION_NUMBER < 0x10101001L
 
static const EVP_CIPHER *(*EVP_sm4_ecb)()=EVP_aes_128_ecb;
 
#endif
 
 
 
typedef struct {
 
    const unsigned char *in_data;
 
    size_t in_data_len;
 
    int in_data_is_already_padded;
 
    const unsigned char *in_ivec;
 
    const unsigned char *in_key;
 
    size_t in_key_len;
 
} test_case_t;
 
 
 
 
 
void test_encrypt_with_cipher(const test_case_t *in, const EVP_CIPHER *cipher)
 
{
 
    unsigned char *out_buf = NULL;
 
    int out_len;
 
    int out_padding_len;
 
    EVP_CIPHER_CTX *ctx;
 
 
 
    ctx = EVP_CIPHER_CTX_new();
 
    EVP_EncryptInit_ex(ctx, cipher, NULL, in->in_key, in->in_ivec);
 
 
 
    if (in->in_data_is_already_padded)
 
    {
 
        /* Check whether the input data is already padded.
 
        And its length must be an integral multiple of the cipher's block size. */
 
        const size_t bs = EVP_CIPHER_block_size(cipher);
 
        if (in->in_data_len % bs != 0)
 
        {
 
            printf("ERROR-1: data length=%d which is not added yet; block size=%d\n", (int) in->in_data_len, (int) bs);
 
            /* Warning: Remember to do some clean-ups */
 
            EVP_CIPHER_CTX_free(ctx);
 
            return;
 
        }
 
        /* Disable the implicit PKCS#7 padding defined in EVP_CIPHER */
 
        EVP_CIPHER_CTX_set_padding(ctx, 0);
 
    }
 
 
 
    out_buf = (unsigned char *) malloc(((in->in_data_len>>4)+1) << 4);
 
    out_len = 0;
 
    EVP_EncryptUpdate(ctx, out_buf, &out_len, in->in_data, in->in_data_len);
 
    if (1)
 
    {
 
        printf("Debug: out_len=%d\n", out_len);
 
    }
 
 
 
    out_padding_len = 0;
 
    EVP_EncryptFinal_ex(ctx, out_buf+out_len, &out_padding_len);
 
    if (1)
 
    {
 
        printf("Debug: out_padding_len=%d\n", out_padding_len);
 
    }
 
 
 
    EVP_CIPHER_CTX_free(ctx);
 
    if (1)
 
    {
 
        int i;
 
        int len;
 
        len = out_len + out_padding_len;
 
        for (i=0; i<len; i++)
 
        {
 
            printf("%02x ", out_buf[i]);
 
        }
 
        printf("\n");
 
    }
 
 
 
    if (out_buf)
 
    {
 
        free(out_buf);
 
        out_buf = NULL;
 
    }
 
}
 
 
 
void main()
 
{
 
    int have_sm4 = (OPENSSL_VERSION_NUMBER >= 0x10101001L);
 
    int have_aes = 1;
 
    const unsigned char data[]=
 
    {
 
        0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
 
        0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10,
 
    };
 
    unsigned char ivec[EVP_MAX_IV_LENGTH]; ///< IV 向量
 
    const unsigned char key1[16] = ///< key_data, 密钥内容, 至少16字节
 
    {
 
        0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
 
        0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10,
 
    };
 
    test_case_t tc;
 
 
 
    tc.in_data = data;
 
    tc.in_data_len = sizeof(data);
 
    tc.in_data_is_already_padded = (tc.in_data_len % 16)==0; // Hard coded 16 as the cipher's block size
 
    tc.in_key = key1;
 
    tc.in_key_len = sizeof(key1);
 
    memset(ivec, 0x00, EVP_MAX_IV_LENGTH);
 
    tc.in_ivec = ivec;
 
 
 
#if defined(OPENSSL_NO_SM4)
 
    have_sm4 = 0;
 
#endif
 
    if (have_sm4)
 
    {
 
        printf("[1]\n");
 
        printf("Debug: EVP_sm4_ecb() test\n");
 
        test_encrypt_with_cipher(&tc, EVP_sm4_ecb());
 
    }
 
#if defined(OPENSSL_NO_AES)
 
    have_aes = 0;
 
#endif
 
    if (have_aes)
 
    {
 
        printf("[2]\n");
 
        printf("Debug: EVP_aes_128_ecb() test\n");
 
        test_encrypt_with_cipher(&tc, EVP_aes_128_ecb());
 
    }
 
}