create SHA1 Sign - Java Security

Java examples for Security:SHA

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Description

create SHA1 Sign

Demo Code


//package com.java2s;
import java.security.MessageDigest;
import java.util.Iterator;
import java.util.Map;

import java.util.Set;
import java.util.SortedMap;

public class Main {
    public static String createSHA1Sign(SortedMap<String, String> signParams) {
        StringBuffer sb = new StringBuffer();
        Set set = signParams.entrySet();
        Iterator it = set.iterator();
        while (it.hasNext()) {
            Map.Entry entry = (Map.Entry) it.next();
            String k = (String) entry.getKey();
            String v = (String) entry.getValue();
            sb.append(k + "=" + v + "&");
        }// w  w w.j  a  va  2 s . co m
        String params = sb.substring(0, sb.lastIndexOf("&"));
        System.out.println("sha1 sb : " + params);
        return getSha1(params);
    }

    public static String getSha1(String str) {
        if (str == null || str.length() == 0) {
            return null;
        }
        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8',
                '9', 'a', 'b', 'c', 'd', 'e', 'f' };
        try {
            MessageDigest mdTemp = MessageDigest.getInstance("SHA1");
            mdTemp.update(str.getBytes("GBK"));
            byte[] md = mdTemp.digest();
            int j = md.length;
            char buf[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                buf[k++] = hexDigits[byte0 >>> 4 & 0xf];
                buf[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(buf);
        } catch (Exception e) {
            return null;
        }
    }
}

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