package utils

import (
	"crypto/md5"
	"crypto/x509"
	"encoding/hex"
	"encoding/pem"
	"fmt"
	"log"
)

// md5Hash 计算 MD5 哈希值
func md5Hash(s string) string {
	h := md5.New()
	h.Write([]byte(s))
	return hex.EncodeToString(h.Sum(nil))
}

// hex2dec 将字节数组转换为十六进制字符串
func hex2dec(hex string) string {
	var dec int
	fmt.Sscanf(hex, "%x", &dec)
	return fmt.Sprintf("%d", dec)
}

// getCert 从证书数据中提取证书
func getCert(certData []byte) (*x509.Certificate, error) {
	block, _ := pem.Decode(certData)
	if block == nil {
		log.Fatal("Failed to parse PEM block containing the cert")
	}

	cert, err := x509.ParseCertificate(block.Bytes)
	if err != nil {
		return nil, fmt.Errorf("failed to parse certificate: %v", err)
	}

	return cert, nil
}