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 "";   }  }