微信签名

src/main/java/com/muyu/pay/wechat/utils/SignUtils.java

@@ -0,0 +1,55 @@
+package com.muyu.pay.wechat.utils;
+
+import okhttp3.HttpUrl;
+
+import java.security.Signature;
+import java.util.Base64;
+
+/**
+ * @author DongZl
+ * @description: 签名工具类
+ * @Date 2023-8-21 上午 11:23
+ */
+public class SignUtils {
+
+    // Authorization: <schema> <token>
+// GET - getToken("GET", httpurl, "")
+// POST - getToken("POST", httpurl, json)
+    String schema = "WECHATPAY2-SHA256-RSA2048";
+    HttpUrl httpurl = HttpUrl.parse(url);
+
+    String getToken(String method, HttpUrl url, String body) {
+        String nonceStr = "your nonce string";
+        long timestamp = System.currentTimeMillis() / 1000;
+        String message = buildMessage(method, url, timestamp, nonceStr, body);
+        String signature = sign(message.getBytes("utf-8"));
+
+        return "mchid=\"" + yourMerchantId + "\","
+                + "nonce_str=\"" + nonceStr + "\","
+                + "timestamp=\"" + timestamp + "\","
+                + "serial_no=\"" + yourCertificateSerialNo + "\","
+                + "signature=\"" + signature + "\"";
+    }
+
+    String sign(byte[] message) {
+        Signature sign = Signature.getInstance("SHA256withRSA");
+        sign.initSign(yourPrivateKey);
+        sign.update(message);
+
+        return Base64.getEncoder().encodeToString(sign.sign());
+    }
+
+
+    String buildMessage(String method, HttpUrl url, long timestamp, String nonceStr, String body) {
+        String canonicalUrl = url.encodedPath();
+        if (url.encodedQuery() != null) {
+            canonicalUrl += "?" + url.encodedQuery();
+        }
+
+        return method + "\n"
+                + canonicalUrl + "\n"
+                + timestamp + "\n"
+                + nonceStr + "\n"
+                + body + "\n";
+    }
+}