java aes_cbc_256 加密解密

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 bcprovlib pkcs7padding PKCS7 TEST
This is java bcprovlib pkcs7padding PKCS7 TEST
TEST PASS

View Code
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