Question

我正在尝试加密C和java中的字符串，以查看两端的结果是否相同，然后尝试在每一个中解密该结果，但是当我运行我的代码时，结果看起来非常不同在每一个

这是我的C代码：

#include <string.h>
#include <openssl/aes.h>

char key[] = "thisisasecretkey";

 int main(){
 unsigned char text[]="hello world";
 unsigned char enc_out[80];
 unsigned char dec_out[80];

 AES_KEY enc_key, dec_key;

 AES_set_encrypt_key(key, 128, &enc_key);
 AES_encrypt(text, enc_out, &enc_key);

 printf("original:%s\t",text);
 printf("\nencrypted:%s\t",enc_out);
 printf("\n");

 return 0;
}

这是我的java代码：

package com.caja.utilidades;

import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public class MainClass {

private static final String ALGORITHM = "AES";
private static final String keyValue = "thisisasecretkey";

public static void main(String[] args) throws Exception {
    System.out.println(encrypt("hello world"));
}

public static String encrypt(String valueToEnc) throws Exception {
  Key key = generateKey();
  Cipher cipher = Cipher.getInstance(ALGORITHM);
  cipher.init(Cipher.ENCRYPT_MODE, key);
  byte[] encValue = cipher.doFinal(valueToEnc.getBytes());
  return new String(encValue);
}

private static Key generateKey() throws Exception {
  Key key = new SecretKeySpec(keyValue.getBytes(), ALGORITHM);
  return key;
}


}

在C中我正在使用openssl库，对于C和java我正在使用eclipse，提前感谢。

我在代码中进行了一些更改，以比较两个程序中的结果

新代码

C代码：

#include <string.h>
#include <openssl/aes.h>

char key[] = "thisisasecretkey";

int main(){
unsigned char text[]="hello world";
unsigned char enc_out[80];
unsigned char dec_out[80];

AES_KEY enc_key, dec_key;

AES_set_encrypt_key(key, 128, &enc_key);
AES_encrypt(text, enc_out, &enc_key);

int i;

printf("original:\t");
for(i=0;*(text+i)!=0x00;i++)
    printf("%02X ",*(text+i));
printf("\nencrypted:\t");
for(i=0;*(enc_out+i)!=0x00;i++)
    printf("%02X ",*(enc_out+i));
printf("\n");

printf("original:%s\t",text);
printf("\nencrypted:%s\t",enc_out);
printf("\ndecrypted:%s\t",dec_out);
printf("\n");

return 0;
}

java代码：

import java.security.Key;
import java.security.MessageDigest;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public class MainClass {

private static final String ALGORITHM = "AES";
private static final String keyValue = "thisisasecretkey";
final protected static char[] hexArray = "0123456789ABCDEF".toCharArray();

public static void main(String[] args) throws Exception {
    System.out.println(encrypt("hello world"));
}

public static String encrypt(String valueToEnc) throws Exception {
  Key key = generateKey();
  Cipher cipher = Cipher.getInstance(ALGORITHM);
  cipher.init(Cipher.ENCRYPT_MODE, key);
  byte[] encValue = cipher.doFinal(valueToEnc.getBytes());
  System.out.println(bytesToHex(encValue));
  return new String(encValue);
}

private static Key generateKey() throws Exception {
  byte[] key2 = keyValue.getBytes("UTF-8");
  MessageDigest sha = MessageDigest.getInstance("SHA-1");
  key2 = sha.digest(key2);
  key2 = Arrays.copyOf(key2, 16);

  Key key = new SecretKeySpec(key2, ALGORITHM);
  return key;
}

public static String bytesToHex(byte[] bytes) {
    char[] hexChars = new char[bytes.length * 2];
    for ( int j = 0; j < bytes.length; j++ ) {
        int v = bytes[j] & 0xFF;
        hexChars[j * 2] = hexArray[v >>> 4];
        hexChars[j * 2 + 1] = hexArray[v & 0x0F];
    }
    return new String(hexChars);
 }

}

C结果：

original:   68 65 6C 6C 6F 20 77 6F 72 6C 64 
encrypted:  17 EF AC E9 35 B1 81 67 EA 7D BB 99 E2 4F D1 E8 70 35 62 BD 
original:hello world    
encrypted:ï¬é5±?gê}»™âOÑèp5b½   
decrypted:hello world

Java结果：

encrypted: 764AA3D074EE1399858ECD7076957D21
encrypted: vJ£Ðtî™…ŽÍpv•}!

Answer 1

我将与Java方面交流;我相信同样的评论也适用于C版本。

您不想使用加密的字节数组并将其转换为字符串。特别是，在这里：

byte[] encValue = cipher.doFinal(valueToEnc.getBytes());
return new String(encValue);

问题是new String(byte[] b)将字节数组解释为使用默认编码编码的字符串。当然，字节数组不是编码字符串，因此这不是特别有用。

如果您想获得一个可用于比较加密字节数组（可视化）的字符串，典型的方法是对字节数组进行十六进制编码。有关详细信息，请参阅How to convert a byte array to a hex string in Java?和How do you convert buffer (byte array) to hex string in C?。当然，有许多库支持这种功能。

C和Java中的AES字符串加密/解密

1 个答案: