OpenSSL加解密程序

#include
#include
#include
#include
#include


/* 加解密 */
void encrypt_decrypt_test() {
uint8_t key[EVP_MAX_KEY_LENGTH];
uint8_t iv[EVP_MAX_KEY_LENGTH];
EVP_CIPHER_CTX ctx;
uint8_t out[1024];
int out_len;


for (int i = 0; i < EVP_MAX_KEY_LENGTH; i++) {
key[i] = i;
iv[i] = i;
}


EVP_CIPHER_CTX_init(&ctx);


int ret = EVP_EncryptInit(&ctx, EVP_des_ede3_cbc(), key, iv);
if (ret != 1) {
printf("encrypt init error\n");
return;
}


char* msg = "hello world";
int in_len = 12;
ret = EVP_EncryptUpdate(&ctx, out, &out_len, (uint8_t*)msg, in_len);


int out_left_len;
ret = EVP_EncryptFinal(&ctx, out + out_len, &out_left_len);
out_len += out_left_len;


printf("原文:%s\n", msg);
printf("密文:");
for (int i = 0; i < out_len; i++) {
printf("0x%02x ", out[i]);
}
printf("\n");
ret = EVP_DecryptInit(&ctx, EVP_des_ede3_cbc(), key, iv);


uint8_t decrypt[128];
int decrypt_len;
ret = EVP_DecryptUpdate(&ctx, decrypt, &decrypt_len, out, out_len);


ret = EVP_DecryptFinal(&ctx, decrypt + decrypt_len, &decrypt_len);


EVP_CIPHER_CTX_cleanup(&ctx);


printf("解密:%s\n", decrypt);
printf("\n-----------------------\n");
}