From efd3ff69a125f1c980938841958b4e6f1ca34942 Mon Sep 17 00:00:00 2001
From: TsMask <340112800@qq.com>
Date: Wed, 23 Aug 2023 17:21:50 +0800
Subject: [PATCH] =?UTF-8?q?ca=E7=99=BB=E5=BD=95=E8=AE=A4=E8=AF=81=E5=85=AC?=
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---
 core/utils/cakey.go | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 core/utils/cakey.go

diff --git a/core/utils/cakey.go b/core/utils/cakey.go
new file mode 100644
index 0000000..25d94e4
--- /dev/null
+++ b/core/utils/cakey.go
@@ -0,0 +1,34 @@
+package utils
+
+import (
+	"crypto"
+	"crypto/rsa"
+	"crypto/sha256"
+	"crypto/x509"
+	"encoding/pem"
+	"fmt"
+)
+
+// 解析PKCS1公钥
+// https://uutool.cn/rsa-generate/
+func ParsePKCS1PublicKey(publicKeyPEM string) (*rsa.PublicKey, error) {
+	block, _ := pem.Decode([]byte(publicKeyPEM))
+	if block == nil {
+		return nil, fmt.Errorf("无效的公钥 -----BEGIN RSA PUBLIC KEY----- 编码")
+	}
+
+	pubKey, err := x509.ParsePKCS1PublicKey(block.Bytes)
+	if err != nil {
+		return nil, err
+	}
+
+	return pubKey, nil
+}
+
+// 验证签名
+func VerifySignature(publicKey *rsa.PublicKey, data, signature []byte) bool {
+	hashed := sha256.Sum256(data)
+	err := rsa.VerifyPKCS1v15(publicKey, crypto.SHA256, hashed[:], signature)
+
+	return err == nil
+}