des加密算法, C++和java相互加解密
时间: 2023-05-22 08:05:09 浏览: 72
对于des加密算法在C和java之间的相互加解密,可以使用相同的key和iv,然后使用相应的库函数进行加解密操作。例如,在C语言中可以使用openssl库进行加解密操作,而在java中可以使用javax.crypto库进行加解密操作。需要注意的是,在使用des算法进行加解密时,key和iv的长度需要满足相应的要求。
相关问题
DES加密解密算法c++
DES加密解密算法是一种对称加密算法,使用相同的密钥进行加密和解密。下面是使用C语言实现DES加密解密算法的代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/des.h>
void des_encrypt(char *key, char *input, char *output)
{
DES_cblock key2;
DES_key_schedule schedule;
memcpy(key2, key, 8);
DES_set_key_unchecked(&key2, &schedule);
DES_cblock input2,output2;
memcpy(input2, input, 8);
DES_ecb_encrypt(&input2, &output2, &schedule, DES_ENCRYPT);
memcpy(output, output2, 8);
}
void des_decrypt(char *key, char *input, char *output)
{
DES_cblock key2;
DES_key_schedule schedule;
memcpy(key2, key, 8);
DES_set_key_unchecked(&key2, &schedule);
DES_cblock input2,output2;
memcpy(input2, input, 8);
DES_ecb_encrypt(&input2, &output2, &schedule, DES_DECRYPT);
memcpy(output, output2, 8);
}
int main()
{
char key[8] = {'1', '2', '3', '4', '5', '6', '7', '8'};
char input[8] = {'h', 'e', 'l', 'l', 'o', 'w', 'o', 'r'};
char output[8];
des_encrypt(key, input, output);
printf("encrypted data: ");
for (int i = 0; i < 8; i++) {
printf("%02x ", output[i]);
}
printf("\n");
des_decrypt(key, output, input);
printf("decrypted data: %s\n", input);
return 0;
}
```
以上代码使用了OpenSSL库中的DES加密解密函数,可以在Linux或者MacOS下编译运行。
DES加密解密算法java
DES加密解密算法是一种对称加密算法,在Java中可以使用JDK自带的Cipher类实现。下面是一个简单的示例代码:
```java
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;
public class DesDemo {
private static final String KEY_ALGORITHM = "DES";
private static final String CIPHER_ALGORITHM = "DES/ECB/PKCS5Padding";
public static String encrypt(String content, String password) throws Exception {
SecretKey secretKey = generateKey(password);
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
byte[] encryptedBytes = cipher.doFinal(content.getBytes(StandardCharsets.UTF_8));
return Base64.getEncoder().encodeToString(encryptedBytes);
}
public static String decrypt(String content, String password) throws Exception {
SecretKey secretKey = generateKey(password);
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, secretKey);
byte[] encryptedBytes = Base64.getDecoder().decode(content);
byte[] decryptedBytes = cipher.doFinal(encryptedBytes);
return new String(decryptedBytes, StandardCharsets.UTF_8);
}
private static SecretKey generateKey(String password) throws NoSuchAlgorithmException {
KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_ALGORITHM);
keyGenerator.init(56);
return new SecretKeySpec(password.getBytes(StandardCharsets.UTF_8), KEY_ALGORITHM);
}
public static void main(String[] args) throws Exception {
String content = "Hello, World!";
String password = "12345678";
String encryptedContent = encrypt(content, password);
String decryptedContent = decrypt(encryptedContent, password);
System.out.println("明文:" + content);
System.out.println("密文:" + encryptedContent);
System.out.println("解密后:" + decryptedContent);
}
}
```