3DES算法的C++实现
时间: 2023-11-10 19:23:27 浏览: 71
以下是3DES算法的C实现:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/des.h>
#define BUFSIZE 1024
void print_hex(const char *title, const unsigned char *s, int len);
int main(int argc, char *argv[])
{
if (argc != 4) {
printf("Usage: %s <key> <input file> <output file>\n", argv[0]);
return 1;
}
// 生成3DES密钥
DES_cblock key1, key2, key3;
memset(key1, 0, sizeof(DES_cblock));
memset(key2, 0, sizeof(DES_cblock));
memset(key3, 0, sizeof(DES_cblock));
memcpy(key1, argv[1], 8);
memcpy(key2, argv[1] + 8, 8);
memcpy(key3, argv[1] + 16, 8);
DES_key_schedule ks1, ks2, ks3;
DES_set_key_unchecked(&key1, &ks1);
DES_set_key_unchecked(&key2, &ks2);
DES_set_key_unchecked(&key3, &ks3);
// 打开输入文件
FILE *fin = fopen(argv[2], "rb");
if (!fin) {
printf("Failed to open input file.\n");
return 1;
}
// 打开输出文件
FILE *fout = fopen(argv[3], "wb");
if (!fout) {
printf("Failed to open output file.\n");
return 1;
}
// 加密/解密数据
unsigned char buf[BUFSIZE];
int len;
while ((len = fread(buf, 1, BUFSIZE, fin)) > 0) {
DES_ede3_cbc_encrypt(buf, buf, len, &ks1, &ks2, &ks3, &key1, &key2, &key3, DES_ENCRYPT);
fwrite(buf, 1, len, fout);
}
// 关闭文件
fclose(fin);
fclose(fout);
return 0;
}
void print_hex(const char *title, const unsigned char *s, int len)
{
printf("%s:", title);
for (int i = 0; i < len; i++) {
printf(" %02x", s[i]);
}
printf("\n");
}
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