WeChat two signature algorithms MD5 and HMAC-SHA256

In the process of developing the WeChat interface, sometimes I find that the signature verification fails. The same signature logic is that some interfaces run through, and I found a lot of pits after looking for a circle;

It turns out that the signType signature types of some interfaces are different. Some interfaces require MD5 for signType, and some require HMAC-SHA256. In fact, these two algorithms are both

There is not much difference in the hash algorithm. Difference, but the generated signature result will be different;

Attach the HMAC-SHA256 algorithm code below

package com.lh.micro.datasource.util;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

public class HMACSHA256 {


    /**
     * Convert the encrypted byte array into a string
     *
     * @param b byte array
     * @return string
     */
    public static String byteArrayToHexString(byte[] b) {
        StringBuilder hs = new StringBuilder();
        String stmp;
        for (int n = 0; b!=null && n 

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Two signature algorithms of WeChat MD5 and HMAC-SHA256

package com.lh.micro.datasource.util;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

public class HMACSHA256 {


    /**
     * Convert the encrypted byte array into a string
     *
     * @param b byte array
     * @return string
     */
    public static String byteArrayToHexString(byte[] b) {
        StringBuilder hs = new StringBuilder();
        String stmp;
        for (int n = 0; b!=null && n