package com.doumee.core.utils;
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import java.io.UnsupportedEncodingException;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import javax.crypto.Cipher;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import org.apache.commons.lang.StringUtils;
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public class EncryptUtil {
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private static byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 };
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/**
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* des加密 加密以 byte[] 明文输入 ,byte[] 密文输出
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*
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* @author: j
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* @date: 2014-8-21
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*
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* @param encryptBytes
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* :要加密的字节数组
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* @param encryptKey
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* ：秘钥，只能是八位字母和数字的组合
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* @return
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* @throws Exception
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*/
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public static byte[] encryptDES(byte[] encryptBytes, String encryptKey)
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throws Exception {
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IvParameterSpec zeroIv = new IvParameterSpec(iv);
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SecretKeySpec key = new SecretKeySpec(encryptKey
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.getBytes( "UTF-8"), "DES");
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Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
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cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
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byte[] encryptedData = cipher.doFinal(encryptBytes);
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return Base64Util.Encode(encryptedData);
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}
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/**
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* @author: j
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* @date: 2014-8-21
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*
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* @param decryptBytes
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* ：要解密的字节数组
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* @param decryptKey
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* ：解密的秘钥，只能是八位字母和数字的组合
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* @return
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* @throws Exception
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*/
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public static byte[] decryptDES(byte[] decryptBytes, String decryptKey)
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throws Exception {
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byte[] byteMi = Base64Util.decode(decryptBytes);
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IvParameterSpec zeroIv = new IvParameterSpec(iv);
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SecretKeySpec key = new SecretKeySpec(decryptKey
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.getBytes( "UTF-8"), "DES");
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Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
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cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);
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byte decryptedData[] = cipher.doFinal(byteMi);
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return decryptedData;
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}
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/**
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* MD5加密 2014-9-25
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*
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* @param plainText
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* @return
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* @throws NoSuchAlgorithmException
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* String
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* @throws UnsupportedEncodingException
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*/
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public static String Md5(String plainText) throws NoSuchAlgorithmException,
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UnsupportedEncodingException {
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MessageDigest md = MessageDigest.getInstance("MD5");
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md.update(plainText.getBytes( "UTF-8"));
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byte b[] = md.digest();
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int i;
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StringBuffer buf = new StringBuffer(StringUtils.EMPTY);
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for (int offset = 0; offset < b.length; offset++) {
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i = b[offset];
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if (i < 0) {
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i += 256;
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}
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if (i < 16) {
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buf.append("0");
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}
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buf.append(Integer.toHexString(i));
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}
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return buf.toString();
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}
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}
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