在数字化时代,数据保险成为了一个不容忽视的话题。C言语作为一种高机能、机动的编程言语,在加密编程范畴有着广泛的利用。本文将从基本到实战,揭秘C言语加密编程的奥秘,帮助读者控制数据保险防护的秘籍。
加密算法是加密编程的核心。罕见的加密算法包含:
密钥是加密跟解密的核心,因此密钥管理至关重要。以下是一些罕见的密钥管理方法:
以下是一个利用AES算法加密跟解密字符串的C言语示例:
#include <stdio.h>
#include <string.h>
#include <openssl/aes.h>
#define AES_KEY_SIZE 16 // AES-128
#define AES_BLOCK_SIZE 16 // AES块大小
void AES_encrypt(const unsigned char *key, const unsigned char *plaintext, unsigned char *ciphertext) {
AES_KEY aes_key;
AES_set_encrypt_key(key, AES_KEY_SIZE * 8, &aes_key);
AES_cbc_encrypt(plaintext, ciphertext, AES_BLOCK_SIZE * 2, &aes_key, (unsigned char*)"0123456789abcdef", AES_ENCRYPT);
}
void AES_decrypt(const unsigned char *key, const unsigned char *ciphertext, unsigned char *plaintext) {
AES_KEY aes_key;
AES_set_decrypt_key(key, AES_KEY_SIZE * 8, &aes_key);
AES_cbc_encrypt(ciphertext, plaintext, AES_BLOCK_SIZE * 2, &aes_key, (unsigned char*)"0123456789abcdef", AES_DECRYPT);
}
int main() {
unsigned char key[AES_KEY_SIZE] = "1234567890abcdef"; // AES密钥
unsigned char plaintext[] = "Hello, World!";
unsigned char ciphertext[AES_BLOCK_SIZE * 2];
unsigned char decryptedtext[AES_BLOCK_SIZE * 2];
AES_encrypt(key, plaintext, ciphertext);
AES_decrypt(key, ciphertext, decryptedtext);
printf("Plaintext: %s\n", plaintext);
printf("Ciphertext: ");
for (int i = 0; i < AES_BLOCK_SIZE * 2; i++) {
printf("%02x", ciphertext[i]);
}
printf("\nDecrypted text: %s\n", decryptedtext);
return 0;
}
以下是一个利用RSA算法加密跟解密数据的C言语示例:
#include <stdio.h>
#include <string.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>
int main() {
char *pub_key_pem = "-----BEGIN PUBLIC KEY-----\n..."
char *priv_key_pem = "-----BEGIN PRIVATE KEY-----\n..."
RSA *rsa_pub_key = PEM_read_RSAPublicKey((bio *)NULL, NULL, NULL, NULL);
RSA *rsa_priv_key = PEM_read_RSAPrivateKey((bio *)NULL, NULL, NULL, NULL);
unsigned char plaintext[] = "Hello, World!";
unsigned char ciphertext[RSA_size(rsa_pub_key)];
unsigned char decryptedtext[RSA_size(rsa_priv_key)];
// 加密数据
int enc = RSA_public_encrypt(strlen(plaintext) + 1, plaintext, ciphertext, rsa_pub_key, RSA_PKCS1_PADDING);
if (enc < 0) {
ERR_print_errors_fp(stderr);
return -1;
}
// 解密数据
int dec = RSA_private_decrypt(enc, ciphertext, decryptedtext, rsa_priv_key, RSA_PKCS1_PADDING);
if (dec < 0) {
ERR_print_errors_fp(stderr);
return -1;
}
printf("Plaintext: %s\n", plaintext);
printf("Ciphertext: ");
for (int i = 0; i < RSA_size(rsa_pub_key); i++) {
printf("%02x", ciphertext[i]);
}
printf("\nDecrypted text: %s\n", decryptedtext);
// 清理资本
RSA_free(rsa_pub_key);
RSA_free(rsa_priv_key);
return 0;
}
经由过程本文的介绍,信赖读者对C言语加密编程有了更深刻的懂得。在现实利用中,应根据具体须要跟场景抉择合适的加密算法跟密钥管理方法,确保数据保险。控制数据保险防护秘籍,为数字化时代的数据保险保驾护航。