com.github.wechat.sdk.aes.SHA1 Maven / Gradle / Ivy
Show all versions of wechat.sdk Show documentation
package com.github.wechat.sdk.aes;
import com.github.wechat.sdk.aes.exception.AesException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
/**
* Created by liuchunlong on 17-1-25.
*
* 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。签名流程：msg_signature=sha1(sort(Token、timestamp、nonce, msg_encrypt))
*
* @param token 公众平台上，开发者设置的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 执行失败，请查看该异常的错误码和具体的错误信息
*/
public static String getSHA1(String token, String timestamp, String nonce, String encrypt) throws AesException {
try {
String[] array = new String[]{token, timestamp, nonce, encrypt};
StringBuffer sb = new StringBuffer();
// 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();
StringBuffer hexstr = new StringBuffer();
for (int i = 0; i < digest.length; i++) {
//digest[i] & 0xFF：将字节转为int类型
//将int类型转为16进制
String shaHex = Integer.toHexString(digest[i] & 0xFF);
if (shaHex.length() < 2) {
hexstr.append(0);
}
hexstr.append(shaHex);
}
return hexstr.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
throw new AesException(AesException.ComputeSignatureError);
}
}
}