java加密算法--MD5加密和哈希散列带秘钥加密算法源码

最近学习加密算法的知识，利用MD5加密，百度一下网上资料很多，不是很详细，这里就整理下如何实现用MD5加密和 哈希散列带秘钥加密算法，大家可以看下。

实现代码：

package com.ompa.common.utils; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import javax.crypto.Mac; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; /** * 采用MD5加密 * * @author zhangcd * @date 2016-4-29 */ public class EncryptUtil { private static final String MAC_NAME = "HmacSHA1"; private static final String ENCODING = "UTF-8"; private static final String key = "iloveyou"; /*** * MD5加码 生成32位md5码 */ public static String string2MD5(String inStr){ MessageDigest md5 = null; try{ md5 = MessageDigest.getInstance("MD5"); }catch (Exception e){ System.out.println(e.toString()); e.printStackTrace(); return ""; } char[] charArray = inStr.toCharArray(); byte[] byteArray = new byte[charArray.length]; for (int i = 0; i < charArray.length; i++) byteArray[i] = (byte) charArray[i]; byte[] md5Bytes = md5.digest(byteArray); StringBuffer hexValue = new StringBuffer(); for (int i = 0; i < md5Bytes.length; i++){ int val = ((int) md5Bytes[i]) & 0xff; if (val < 16) hexValue.append("0"); hexValue.append(Integer.toHexString(val)); } return hexValue.toString(); } /*** * MD5加密 生成32位md5码 */ public static String stringMD5(String inStr){ return string2MD5(string2MD5(inStr)); } /** * 加密解密算法 */ public static String convertMD5(String inStr){ char[] a = inStr.toCharArray(); for (int i = 0; i < a.length; i++){ a[i] = (char) (a[i] ^ 't'); } String s = new String(a); return s; } /** * HMAC-SHA1 * @param encryptText * @param encryptKey * @return * @throws Exception */ public static String HmacSHA1Encrypt(String encryptText, String encryptKey) throws Exception { byte[] data=encryptKey.getBytes(ENCODING); SecretKey secretKey = new SecretKeySpec(data, MAC_NAME); Mac mac = Mac.getInstance(MAC_NAME); mac.init(secretKey); byte[] text = encryptText.getBytes(ENCODING); byte[] str = mac.doFinal(text); // Create Hex String StringBuffer hexString = new StringBuffer(); // 字节数组转换为 十六进制 数 for (int i = 0; i < str.length; i++) { String shaHex = Integer.toHexString(str[i] & 0xFF); if (shaHex.length() < 2) { hexString.append(0); } hexString.append(shaHex); } return hexString.toString(); } public static String convertSHA1(String instr){ try { return HmacSHA1Encrypt(instr,key); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); return ""; } } // 测试主函数 public static void main(String args[]) throws Exception { //哈希散列带秘钥加密 String tt = convertSHA1("123456"); System.out.println(tt); //MD5加密 String s = new String("123456"); System.out.println("原始：" + s); System.out.println("MD5后：" + string2MD5(s)); System.out.println("MD5加密后：" + stringMD5(s)); } }

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