Java Base64、AES、SHA1、MD5加密算法

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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 "" ;      } } 转载 ：http://www.open-open.com/lib/view/open1392185662160.html