Java AES 加密 解密 结果不一致

[qyvlik]

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class AES1 {

    public static byte[] encryptAES(byte key[], byte data[]) throws Exception {
        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");

        Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");

        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(new byte[16]));

        return cipher.doFinal(data);
    }


    public static byte[] decryptAES(byte key[], byte msg[]) throws Exception {
        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");

        Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");

        cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(new byte[16]));

        return cipher.doFinal(msg);
    }


    public static void main(String[] args) {
        String key = "1234567890123456";
        String text = "1234567890";
        String encrypt = "";
        String decrypt = "";


        try {
            encrypt = new String(encryptAES(key.getBytes("UTF-8"), text.getBytes("UTF-8")));
            System.out.println("encrypt : " + byte2hex(encrypt.getBytes("UTF-8")));

            decrypt = new String(decryptAES(key.getBytes("UTF-8"), encrypt.getBytes("UTF-8")));
            System.out.println("decrypt : " + decrypt);

            System.out.println("text.equals(decrypt): " + text.equals(decrypt));

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String byte2hex(byte[] b) {
        String a = "";
        for (int i = 0; i < b.length; i++) {
            String hex = Integer.toHexString(b[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            a = a + hex;
        }
        return a;
    }
}

代码如上，使用的是 AES 的 CTR 无填充加密算法，但是解密后所得串与原串不相等。

[花谢尊前不敢香]

解密的时候要16进制转为二进制吧

[qyvlik]

引用 1 楼 fangmingshijie 的回复:

解密的时候要16进制转为二进制吧

二进制？应该不用吧。。

[花谢尊前不敢香]

import java.security.Key;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;

public class MainClass {
	public static void main(String[] args) throws Exception {

		SecureRandom random = new SecureRandom("1234567890123456".getBytes());
		byte[] ivBytes = new byte[16];
		IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
		KeyGenerator generator = KeyGenerator.getInstance("AES");
		generator.init(128, random);
		Key key = generator.generateKey();
		
		Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");
		String input = "trefferwrsfsd";
		cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);

		byte[] cipherText = cipher.doFinal(input.getBytes());

		cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);

		byte[] plainText = cipher.doFinal(cipherText);

		System.out.println("plain : " + new String(plainText));
	}

}

我试的没问题。你参考下把

[qyvlik]

引用 3 楼 fangmingshijie 的回复:

import java.security.Key;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;

public class MainClass {
	public static void main(String[] args) throws Exception {

		SecureRandom random = new SecureRandom("1234567890123456".getBytes());
		byte[] ivBytes = new byte[16];
		IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
		KeyGenerator generator = KeyGenerator.getInstance("AES");
		generator.init(128, random);
		Key key = generator.generateKey();
		
		Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");
		String input = "trefferwrsfsd";
		cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);

		byte[] cipherText = cipher.doFinal(input.getBytes());

		cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);

		byte[] plainText = cipher.doFinal(cipherText);

		System.out.println("plain : " + new String(plainText));
	}

}

我试的没问题。你参考下把

谢谢大兄弟，但是我的为何有问题呢？没想明白。。。。

[qyvlik]

引用 4 楼 zyz1985 的回复:

            encrypt = new String(encryptAES(key.getBytes("UTF-8"), text.getBytes("UTF-8"))); //问题出在此处，由于加密后的字节数组不一定满足UTF-8格式导致信息丢失
            System.out.println((text.equals(new String(decryptAES(key.getBytes("UTF-8"), encryptAES(key.getBytes("UTF-8"), text.getBytes("UTF-8"))), "UTF-8")))); //你写的加解密代码是正确的

谢谢指点，我再去研究研究~

[游一游走一走]

            encrypt = new String(encryptAES(key.getBytes("UTF-8"), text.getBytes("UTF-8"))); //问题出在此处，由于加密后的字节数组不一定满足UTF-8格式导致信息丢失
            System.out.println((text.equals(new String(decryptAES(key.getBytes("UTF-8"), encryptAES(key.getBytes("UTF-8"), text.getBytes("UTF-8"))), "UTF-8")))); //你写的加解密代码是正确的

[tianfang]

byte2hex， 需要和这个对应的反向操作方法