package org.yeshi.utils.encrypt;
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import java.io.IOException;
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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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import javax.crypto.Mac;
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import javax.crypto.SecretKey;
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import javax.crypto.spec.SecretKeySpec;
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/**
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* hmac公用方法类
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*
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* @author weihui.tang
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*
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*/
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public class HmacUtils {
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public static final String CHARSET_UTF8 = "UTF-8";
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public static final String KEY_MAC = "HmacMD5";
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private static final String HEXSTR = "0123456789ABCDEF";
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private static String[] binaryArray = { "0000", "0001", "0010", "0011",
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"0100", "0101", "0110", "0111", "1000", "1001", "1010", "1011",
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"1100", "1101", "1110", "1111" };
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/**
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* hmac-md5签名
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*
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* @param data
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* @param secret
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* @return
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* @throws IOException
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* @throws NoSuchAlgorithmException
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* @throws InvalidKeyException
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*/
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public static byte[] encryptHMAC(String data, String secret)
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throws IOException, NoSuchAlgorithmException, InvalidKeyException {
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byte[] bytes = null;
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SecretKey secretKey = new SecretKeySpec(secret.getBytes(CHARSET_UTF8),
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KEY_MAC);
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Mac mac = Mac.getInstance(secretKey.getAlgorithm());
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mac.init(secretKey);
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bytes = mac.doFinal(data.getBytes(CHARSET_UTF8));
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return bytes;
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}
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/**
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* 将byte转化为十六进制字符串
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*
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* @param bytes
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* @return
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*/
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public static String byte2hex(byte[] bytes) {
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StringBuilder sign = new StringBuilder();
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for (int i = 0; i < bytes.length; i++) {
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sign.append(String.valueOf(HEXSTR.charAt((bytes[i] & 0xF0) >> 4))); // 字节高4位
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sign.append(String.valueOf(HEXSTR.charAt(bytes[i] & 0x0F))); // 字节低4位
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}
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return sign.toString().toUpperCase();
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}
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/**
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*
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* @param hexString
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* @return 将十六进制转换为字节数组
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*/
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public static byte[] hexToBinary(String hexString) {
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// hexString的长度对2取整，作为bytes的长度
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int len = hexString.length() / 2;
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byte[] bytes = new byte[len];
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for (int i = 0; i < len; i++) {
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// 右移四位得到高位
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byte high = (byte) ((HEXSTR.indexOf(hexString.charAt(2 * i))) << 4);// 字节高四位
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byte low = (byte) HEXSTR.indexOf(hexString.charAt(2 * i + 1));// 字节低四位
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bytes[i] = (byte) (high | low);// 高地位做或运算
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}
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return bytes;
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}
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/**
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*
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* @param str
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* @return 转换为二进制字符串
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*/
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public static String bytes2BinaryStr(byte[] bArray) {
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String outStr = "";
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for (byte b : bArray) {
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// 高四位
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int pos = (b & 0xF0) >> 4;
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outStr += binaryArray[pos];
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// 低四位
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pos = b & 0x0F;
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outStr += binaryArray[pos];
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}
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return outStr;
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}
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}
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