java aes_cbc_256 加密解密

2022-12-18 11:36:57

在之前我们在openssl上和ios上分别测试了 AES256位cbc模式的加密和解密

今天用java提供的api来测试一下；进而确定一下在PC,iOS，安卓上三个平台下的加密解密数据；

1. 首先通过查询资料了解到：

java的jdk 不支持256位AES密钥,需要安装扩展包，以下会提到
java 中默认不支持PKCS7 填充方式，支持PKCS5,经测试PKCS5和pkcs7没多大区别(在多平台数据互测上)
java中如果非要指定PKCS7 需要借助 BouncyCastle(java用的密码学类库)

2. 关于安装支持AES 256位密钥的扩展包

下载http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html

下载之后得到 local_policy.jar ，US_export_policy.jar 两个jar包，把这两个jar包放到 jdk/lib/security 目录下

替换原来的两个jar包即可

3. 使用java api 进行 AES_cbc_256位密钥 PKCS5 填充方式的加密解密

如下封装

    private static final String ALGORITHM = "AES/CBC/PKCS5Padding";

    //加密

    public static byte[] AES_cbc_encrypt(byte[] srcData,byte[] key,byte[] iv)

    {

        SecretKeySpec keySpec = new SecretKeySpec(key, "AES");

        Cipher cipher = Cipher.getInstance(ALGORITHM);

        cipher.init(Cipher.ENCRYPT_MODE, keySpec, new IvParameterSpec(iv));

        byte[] encData = cipher.doFinal(srcData);

        return encData;

    }

    //解密

    public static byte[] AES_cbc_decrypt(byte[] encData,byte[] key,byte[] iv)

    {

        SecretKeySpec keySpec = new SecretKeySpec(key, "AES");

        Cipher cipher = Cipher.getInstance(ALGORITHM);

        cipher.init(Cipher.DECRYPT_MODE, keySpec, new IvParameterSpec(iv));

        byte[] decbbdt = cipher.doFinal(encData);

        return decbbdt;

    }

测试调用

    public static void main(String[] args) {

        byte[] key= new byte[32];

        byte[] iv = new byte[16];

        String srcStr = "This is java default pkcs5padding PKCS5 TEST";

        System.out.println(srcStr);

          //设置key 全8，iv，全1，这里测试用

          for (int i = 0; i <32; i++) {

            key[i] = 8;

            if (i < 16) {iv[i] = 1;}

        }

        byte[] encbt = AES_cbc_encrypt(srcStr.getBytes(),key,iv);

        byte[] decbt = AES_cbc_decrypt(encbt,key,iv);

        String decStr = new String(decbt);

        System.out.println(decStr);

        if(srcStr.equals(decStr))

        {

            System.out.println("TEST PASS");

        }else

        {

            System.out.println("TEST NO PASS");

        }

    }

输出：

This is java default pkcs5padding PKCS5 TEST

This is java default pkcs5padding PKCS5 TEST

TEST PASS

总结：此处使用的是java提供的PKCS5填充方式，其实和PKCS7是一样的，所以在ios上使用pkcs7,安卓上使用pkcs5，只要key和iv保持一致，相互加解密是没有问题的

完整的代码如下

import java.io.UnsupportedEncodingException;

import java.security.InvalidAlgorithmParameterException;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.security.NoSuchProviderException;

import java.security.Security;

import java.util.Base64;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;

public class TestPKCS5 {

    private static final String ALGORITHM = "AES/CBC/PKCS5Padding";

    //加密

    public static byte[] AES_cbc_encrypt(byte[] srcData,byte[] key,byte[] iv) throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException

    {

    	SecretKeySpec keySpec = new SecretKeySpec(key, "AES");

        Cipher cipher = Cipher.getInstance(ALGORITHM);

        cipher.init(Cipher.ENCRYPT_MODE, keySpec, new IvParameterSpec(iv));

        byte[] encData = cipher.doFinal(srcData);

        return encData;

    }

    //解密

    public static byte[] AES_cbc_decrypt(byte[] encData,byte[] key,byte[] iv) throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException

    {

    	SecretKeySpec keySpec = new SecretKeySpec(key, "AES");

        Cipher cipher = Cipher.getInstance(ALGORITHM);

        cipher.init(Cipher.DECRYPT_MODE, keySpec, new IvParameterSpec(iv));

        byte[] decbbdt = cipher.doFinal(encData);

        return decbbdt;

    }

	public static void main(String[] args) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {

	    byte[] key= new byte[32];

	    byte[] iv = new byte[16];

        String srcStr = "This is java default pkcs5padding PKCS5 TEST";

        System.out.println(srcStr);

      	//设置key 全8，iv，全1，这里测试用

      	for (int i = 0; i <32; i++) {

        	key[i] = 8;

        	if (i < 16) {iv[i] = 1;}

        }

        byte[] encbt = AES_cbc_encrypt(srcStr.getBytes(),key,iv);

        byte[] decbt = AES_cbc_decrypt(encbt,key,iv);

        String decStr = new String(decbt);

        System.out.println(decStr);

        if(srcStr.equals(decStr))

        {

        	System.out.println("TEST PASS");

        }else

        {

        	System.out.println("TEST NO PASS");

        }

	}

}

4. 使用 BouncyCastle库进行 AES_cbc_256 指定PKCS7方式加密解密

需要先去 http://www.bouncycastle.org/latest_releases.html 下载库，并且导入到工程中

如下封装

	//AES_256_cbc pkcs7

    private static final String ALGORITHM = "AES/CBC/PKCS7Padding";

    //加密

    public static byte[] AES_cbc_encrypt(byte[] srcData,byte[] key,byte[] iv)

    {

    	SecretKeySpec keySpec = new SecretKeySpec(key, "AES");

        Security.addProvider(new BouncyCastleProvider());

        Cipher cipher = Cipher.getInstance(ALGORITHM,"BC");

        cipher.init(Cipher.ENCRYPT_MODE, keySpec, new IvParameterSpec(iv));

        byte[] encData = cipher.doFinal(srcData);

        return encData;

    }

    //解密

    public static byte[] AES_cbc_decrypt(byte[] encData,byte[] key,byte[] iv)

    {

    	SecretKeySpec keySpec = new SecretKeySpec(key, "AES");

        Security.addProvider(new BouncyCastleProvider());

        Cipher cipher = Cipher.getInstance(ALGORITHM,"BC");

        cipher.init(Cipher.DECRYPT_MODE, keySpec, new IvParameterSpec(iv));

        byte[] decbbdt = cipher.doFinal(encData);

        return decbbdt;

    }

　　调用测试代码

	public static void main(String[] args)  {

		// TODO Auto-generated method stub

	    byte[] key= new byte[32];

	    byte[] iv = new byte[16];

        String srcStr = "This is java bcprovlib pkcs7padding PKCS7 TEST";

        System.out.println(srcStr);

      	//设置key 全8，iv，全1，这里测试用

      	for (int i = 0; i <32; i++) {

        	key[i] = 8;

        	if (i < 16) {iv[i] = 1;}

        }

        byte[] encbt = AES_cbc_encrypt(srcStr.getBytes(),key,iv);

        byte[] decbt = AES_cbc_decrypt(encbt,key,iv);

        String decStr = new String(decbt);

        System.out.println(decStr);

        if(srcStr.equals(decStr))

        {

        	System.out.println("TEST PASS");

        }else

        {

        	System.out.println("TEST NO PASS");

        }

	}

　　输出结果：

This is java bcprovlib pkcs7padding PKCS7 TEST

This is java bcprovlib pkcs7padding PKCS7 TEST

TEST PASS

总结：此处使用BC库的方式指定PKCS7方式，这样就和ios pc保持一致了；不过使用上面第一种方式也是可行的

完整的代码如下

import java.util.Base64;

import java.io.UnsupportedEncodingException;

import java.security.InvalidAlgorithmParameterException;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.security.NoSuchProviderException;

import java.security.Security;

import java.util.Arrays;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.KeyGenerator;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.SecretKey;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class TestAES {

	//AES_256_cbc pkcs7

    private static final String ALGORITHM = "AES/CBC/PKCS7Padding";

    //加密

    public static byte[] AES_cbc_encrypt(byte[] srcData,byte[] key,byte[] iv) throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException

    {

    	SecretKeySpec keySpec = new SecretKeySpec(key, "AES");

        Security.addProvider(new BouncyCastleProvider());

        Cipher cipher = Cipher.getInstance(ALGORITHM,"BC");

        cipher.init(Cipher.ENCRYPT_MODE, keySpec, new IvParameterSpec(iv));

        byte[] encData = cipher.doFinal(srcData);

        return encData;

    }

    //解密

    public static byte[] AES_cbc_decrypt(byte[] encData,byte[] key,byte[] iv) throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException

    {

    	SecretKeySpec keySpec = new SecretKeySpec(key, "AES");

        Security.addProvider(new BouncyCastleProvider());

        Cipher cipher = Cipher.getInstance(ALGORITHM,"BC");

        cipher.init(Cipher.DECRYPT_MODE, keySpec, new IvParameterSpec(iv));

        byte[] decbbdt = cipher.doFinal(encData);

        return decbbdt;

    }

	public static void main(String[] args) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {

		// TODO Auto-generated method stub

	    byte[] key= new byte[32];

	    byte[] iv = new byte[16];

        String srcStr = "This is java bcprovlib pkcs7padding PKCS7 TEST";

        System.out.println(srcStr);

      	//设置key 全8，iv，全1，这里测试用

      	for (int i = 0; i <32; i++) {

        	key[i] = 8;

        	if (i < 16) {iv[i] = 1;}

        }

        byte[] encbt = AES_cbc_encrypt(srcStr.getBytes(),key,iv);

        byte[] decbt = AES_cbc_decrypt(encbt,key,iv);

        String decStr = new String(decbt);

        System.out.println(decStr);

        if(srcStr.equals(decStr))

        {

        	System.out.println("TEST PASS");

        }else

        {

        	System.out.println("TEST NO PASS");

        }

	}

}

测试使用 jdk1.8

码农公寓

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