数字签名与加密内容算法合在一起总代码C语言
时间: 2023-10-13 16:04:13 浏览: 55
下面是一个简单的示例代码,其中包括数字签名和加密内容算法。该代码使用RSA算法进行数字签名和AES算法进行内容加密。
```
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/rsa.h>
#include <openssl/aes.h>
#include <openssl/rand.h>
#define RSA_KEYLEN 2048
#define AES_KEYLEN 128
int main() {
// 生成RSA密钥对
RSA *rsa = RSA_generate_key(RSA_KEYLEN, RSA_F4, NULL, NULL);
if (!rsa) {
printf("Failed to generate RSA key pair.\n");
return 1;
}
// 随机生成AES密钥和IV
unsigned char aes_key[AES_KEYLEN/8], aes_iv[AES_KEYLEN/8];
if (!RAND_bytes(aes_key, sizeof(aes_key)) || !RAND_bytes(aes_iv, sizeof(aes_iv))) {
printf("Failed to generate random bytes.\n");
return 1;
}
// 加密内容
unsigned char plaintext[] = "Hello, world!";
int plaintext_len = strlen((char *)plaintext);
// 创建AES加密上下文
AES_KEY aes_key_struct;
if (AES_set_encrypt_key(aes_key, AES_KEYLEN, &aes_key_struct) < 0) {
printf("Failed to create AES encryption context.\n");
return 1;
}
// 对明文进行AES加密
unsigned char ciphertext[plaintext_len + AES_BLOCK_SIZE];
memset(ciphertext, 0, sizeof(ciphertext));
int ciphertext_len = 0;
AES_cbc_encrypt(plaintext, ciphertext, plaintext_len, &aes_key_struct, aes_iv, AES_ENCRYPT);
ciphertext_len = plaintext_len + AES_BLOCK_SIZE;
// 对加密后的内容进行数字签名
unsigned char signature[RSA_size(rsa)];
unsigned int signature_len = 0;
if (!RSA_sign(NID_sha256, ciphertext, ciphertext_len, signature, &signature_len, rsa)) {
printf("Failed to sign ciphertext.\n");
return 1;
}
// 验证数字签名
int verified = RSA_verify(NID_sha256, ciphertext, ciphertext_len, signature, signature_len, rsa);
if (verified != 1) {
printf("Failed to verify signature.\n");
return 1;
}
// 输出密钥和加密后的内容
printf("AES key: ");
for (int i = 0; i < sizeof(aes_key); i++) {
printf("%02x", aes_key[i]);
}
printf("\n");
printf("AES IV: ");
for (int i = 0; i < sizeof(aes_iv); i++) {
printf("%02x", aes_iv[i]);
}
printf("\n");
printf("Ciphertext: ");
for (int i = 0; i < ciphertext_len; i++) {
printf("%02x", ciphertext[i]);
}
printf("\n");
printf("Signature: ");
for (int i = 0; i < signature_len; i++) {
printf("%02x", signature[i]);
}
printf("\n");
// 释放RSA密钥对
RSA_free(rsa);
return 0;
}
```
需要注意的是,该代码中使用了OpenSSL库进行RSA和AES的加密和解密。在编译该代码时,需要链接OpenSSL库,例如:
```
gcc -o main main.c -lcrypto
```