Java Base64、AES、SHA1、MD5加密算法（转载）

 package com.example.decript;

 import java.io.UnsupportedEncodingException;
 import java.security.InvalidKeyException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
 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.SecretKeySpec;

 public class DecriptTest {

     public static String SHA1(String decript) {
         try {
             MessageDigest digest = java.security.MessageDigest
                     .getInstance("SHA-1");
             digest.update(decript.getBytes());
             byte messageDigest[] = digest.digest();
             // Create Hex String
             StringBuffer hexString = new StringBuffer();
             // 字节数组转换为 十六进制 数
             for (int i = 0; i < messageDigest.length; i++) {
                 String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);
                 if (shaHex.length() < 2) {
                     hexString.append(0);
                 }
                 hexString.append(shaHex);
             }
             return hexString.toString();

         } catch (NoSuchAlgorithmException e) {
             e.printStackTrace();
         }
         return "";
     }

     public static String SHA(String decript) {
         try {
             MessageDigest digest = java.security.MessageDigest
                     .getInstance("SHA");
             digest.update(decript.getBytes());
             byte messageDigest[] = digest.digest();
             // Create Hex String
             StringBuffer hexString = new StringBuffer();
             // 字节数组转换为 十六进制 数
             for (int i = 0; i < messageDigest.length; i++) {
                 String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);
                 if (shaHex.length() < 2) {
                     hexString.append(0);
                 }
                 hexString.append(shaHex);
             }
             return hexString.toString();

         } catch (NoSuchAlgorithmException e) {
             e.printStackTrace();
         }
         return "";
     }

     public static String MD5(String input) {
         try {
             // 获得MD5摘要算法的 MessageDigest 对象
             MessageDigest mdInst = MessageDigest.getInstance("MD5");
             // 使用指定的字节更新摘要
             mdInst.update(input.getBytes());
             // 获得密文
             byte[] md = mdInst.digest();
             // 把密文转换成十六进制的字符串形式
             StringBuffer hexString = new StringBuffer();
             // 字节数组转换为 十六进制 数
             for (int i = 0; i < md.length; i++) {
                 String shaHex = Integer.toHexString(md[i] & 0xFF);
                 if (shaHex.length() < 2) {
                     hexString.append(0);
                 }
                 hexString.append(shaHex);
             }
             return hexString.toString();
         } catch (NoSuchAlgorithmException e) {
             e.printStackTrace();
         }
         return "";
     }

     /**
      * 加密
      *
      * @param content
      *            需要加密的内容
      * @param password
      *            加密密码
      * @return
      */
     public static byte[] encryptAES(String content, String password) {
         try {
             KeyGenerator kgen = KeyGenerator.getInstance("AES");
             kgen.init(128, new SecureRandom(password.getBytes()));
             SecretKey secretKey = kgen.generateKey();
             byte[] enCodeFormat = secretKey.getEncoded();
             SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
             Cipher cipher = Cipher.getInstance("AES");// 创建密码器
             byte[] byteContent = content.getBytes("utf-8");
             cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
             byte[] result = cipher.doFinal(byteContent);
             return result; // 加密
         } catch (NoSuchAlgorithmException e) {
             e.printStackTrace();
         } catch (NoSuchPaddingException e) {
             e.printStackTrace();
         } catch (InvalidKeyException e) {
             e.printStackTrace();
         } catch (UnsupportedEncodingException e) {
             e.printStackTrace();
         } catch (IllegalBlockSizeException e) {
             e.printStackTrace();
         } catch (BadPaddingException e) {
             e.printStackTrace();
         }
         return null;
     }

     /**
      * 解密
      *
      * @param content
      *            待解密内容
      * @param password
      *            解密密钥
      * @return
      */
     public static byte[] decryptAES(byte[] content, String password) {
         try {
             KeyGenerator kgen = KeyGenerator.getInstance("AES");
             kgen.init(128, new SecureRandom(password.getBytes()));
             SecretKey secretKey = kgen.generateKey();
             byte[] enCodeFormat = secretKey.getEncoded();
             SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
             Cipher cipher = Cipher.getInstance("AES");// 创建密码器
             cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
             byte[] result = cipher.doFinal(content);
             return result; // 加密
         } catch (NoSuchAlgorithmException e) {
             e.printStackTrace();
         } catch (NoSuchPaddingException e) {
             e.printStackTrace();
         } catch (InvalidKeyException e) {
             e.printStackTrace();
         } catch (IllegalBlockSizeException e) {
             e.printStackTrace();
         } catch (BadPaddingException e) {
             e.printStackTrace();
         }
         return null;
     }

     /**
      * BASE64解密
      *
      * @param key
      * @return
      * @throws Exception
      */
     public static String decryptBASE64(String key) {

         return "";
     }

     /**
      * BASE64加密
      *
      * @param key
      * @return
      * @throws Exception
      */
     public static String encryptBASE64(String key) {

         return "";
     }
 }

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原文链接：http://www.open-open.com/lib/view/open1392185662160.html