Java AES256加密解密实现

http://blog.csdn.net/liyuming0000/article/details/48395139

不说别的，直接上代码：

 import it.sauronsoftware.base64.Base64;

 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
 import java.security.Security;

 import javax.crypto.Cipher;
 import javax.crypto.KeyGenerator;
 import javax.crypto.SecretKey;
 import javax.crypto.spec.SecretKeySpec;

 import org.bouncycastle.jce.provider.BouncyCastleProvider;

 /**
  * java实现AES256加密解密
  * 依赖说明：
  * bcprov-jdk15-133.jar：PKCS7Padding
  * javabase64-1.3.1.jar：base64
  * local_policy.jar 和 US_export_policy.jar需添加到%JAVE_HOME%\jre\lib\security中（lib中版本适合jdk1.7）
  */

 public class AES256 {

     public static byte[] encrypt(String content, String password) {
         try {
             //"AES"：请求的密钥算法的标准名称
             KeyGenerator kgen = KeyGenerator.getInstance("AES");
             //256：密钥生成参数；securerandom：密钥生成器的随机源
             SecureRandom securerandom = new SecureRandom(tohash256Deal(password));
             kgen.init(256, securerandom);
             //生成秘密（对称）密钥
             SecretKey secretKey = kgen.generateKey();
             //返回基本编码格式的密钥
             byte[] enCodeFormat = secretKey.getEncoded();
             //根据给定的字节数组构造一个密钥。enCodeFormat：密钥内容；"AES"：与给定的密钥内容相关联的密钥算法的名称
             SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
             //将提供程序添加到下一个可用位置
             Security.addProvider(new BouncyCastleProvider());
             //创建一个实现指定转换的 Cipher对象，该转换由指定的提供程序提供。
             //"AES/ECB/PKCS7Padding"：转换的名称；"BC"：提供程序的名称
             Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");

             cipher.init(Cipher.ENCRYPT_MODE, key);
             byte[] byteContent = content.getBytes("utf-8");
             byte[] cryptograph = cipher.doFinal(byteContent);
             return Base64.encode(cryptograph);
         } catch (Exception e) {
             e.printStackTrace();
         }
         return null;
     }

     public static String decrypt(byte[] cryptograph, String password) {
         try {
             KeyGenerator kgen = KeyGenerator.getInstance("AES");
             SecureRandom securerandom = new SecureRandom(tohash256Deal(password));
             kgen.init(256, securerandom);
             SecretKey secretKey = kgen.generateKey();
             byte[] enCodeFormat = secretKey.getEncoded();
             SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
             Security.addProvider(new BouncyCastleProvider());
             Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");

             cipher.init(Cipher.DECRYPT_MODE, key);
             byte[] content = cipher.doFinal(Base64.decode(cryptograph));
             return new String(content);
         } catch (Exception e) {
             e.printStackTrace();
         }
         return null;
     }

     private static String parseByte2HexStr(byte buf[]) {
         StringBuffer sb = new StringBuffer();
         for (int i = 0; i < buf.length; i++) {
             String hex = Integer.toHexString(buf[i] & 0xFF);
             if (hex.length() == 1) {
                 hex = '0' + hex;
             }
             sb.append(hex.toUpperCase());
         }
         return sb.toString();
     }

     /*private static byte[] parseHexStr2Byte(String hexStr) {
         if (hexStr.length() < 1)
             return null;
         byte[] result = new byte[hexStr.length()/2];
         for (int i = 0;i< hexStr.length()/2; i++) {
             int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);
             int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);
             result[i] = (byte) (high * 16 + low);
         }
         return result;
     }*/

     private static byte[] tohash256Deal(String datastr) {
         try {
             MessageDigest digester=MessageDigest.getInstance("SHA-256");
             digester.update(datastr.getBytes());
             byte[] hex=digester.digest();
             return hex;
         } catch (NoSuchAlgorithmException e) {
             throw new RuntimeException(e.getMessage());
         }
     }

     public static void main(String[] args) {

         String content = "0f607264fc6318a92b9e13c65db7cd3c";
         String password = "zsyy";
         System.out.println("明文：" + content);
         System.out.println("key：" + password);

         byte[] encryptResult = AES256.encrypt(content, password);
         System.out.println("密文：" + AES256.parseByte2HexStr(encryptResult));

         String decryptResult = AES256.decrypt(encryptResult, password);
         System.out.println("解密：" + decryptResult);
     }
 }

运行截图：