com.firefly.wechat.utils.SHA1 Maven / Gradle / Ivy

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package com.firefly.wechat.utils;

import com.firefly.utils.codec.HexUtils;

import java.security.MessageDigest;
import java.util.Arrays;

/**
 * SHA1 class
 * 
 * 计算公众平台的消息签名接口.
 */
public class SHA1 {

    /**
     * 用SHA1算法生成安全签名
     *
     * @param token     票据
     * @param timestamp 时间戳
     * @param nonce     随机字符串
     * @param encrypt   密文
     * @return 安全签名
     * @throws AesException
     */
    public static String getSHA1(String token, String timestamp, String nonce, String encrypt) throws AesException {
        try {
            String[] array = new String[]{token, timestamp, nonce, encrypt};
            StringBuilder sb = new StringBuilder();
            // 字符串排序
            Arrays.sort(array);
            for (int i = 0; i < 4; i++) {
                sb.append(array[i]);
            }
            String str = sb.toString();
            // SHA1签名生成
            MessageDigest md = MessageDigest.getInstance("SHA-1");
            md.update(str.getBytes());
            byte[] digest = md.digest();

            StringBuilder hex = new StringBuilder();
            String shaHex;
            for (byte aDigest : digest) {
                shaHex = Integer.toHexString(aDigest & 0xFF);
                if (shaHex.length() < 2) {
                    hex.append(0);
                }
                hex.append(shaHex);
            }
            return hex.toString();
        } catch (Exception e) {
            throw new AesException(AesException.ComputeSignatureError);
        }
    }

    public static String getSHA1(String plainText, String sessionKey) {
        try {
            StringBuilder sb = new StringBuilder();
            sb.append(plainText).append(sessionKey);
            String str = sb.toString();
            MessageDigest md = MessageDigest.getInstance("SHA-1");
            md.update(str.getBytes());
            byte[] digest = md.digest();
            return HexUtils.bytesToHex(digest);
        } catch (Exception e) {
            throw new IllegalArgumentException(e);
        }
    }

    public static void main(String[] args) {
        String s = getSHA1("{\"nickName\":\"Band\",\"gender\":1,\"language\":\"zh_CN\",\"city\":\"Guangzhou\",\"province\":\"Guangdong\",\"country\":\"CN\",\"avatarUrl\":\"http://wx.qlogo.cn/mmopen/vi_32/1vZvI39NWFQ9XM4LtQpFrQJ1xlgZxx3w7bQxKARol6503Iuswjjn6nIGBiaycAjAtpujxyzYsrztuuICqIM5ibXQ/0\"}",
                "HyVFkGl5F5OQWJZZaNzBBg==");
        System.out.println(s);
        System.out.println("75e81ceda165f4ffa64f4068af58c64b8f54b88c".equals(s));
    }
}