TOTP/OTP

复制import hmac
import struct
import time
import base64

# 基于 RFC 6238 生成 TOTP 验证码
secret = "JBSWY3DPEHPK3PXP"  # Base32 编码的密钥
key = base64.b32decode(secret, casefold=True)

# 当前时间步（30 秒窗口）
t = int(time.time()) // 30
msg = struct.pack(">Q", t)
h = hmac.new(key, msg, "sha1").digest()
offset = h[-1] & 0x0F
code = (struct.unpack(">I", h[offset:offset+4])[0] & 0x7FFFFFFF) % 1000000
print(f"{code:06d}")  # 输出 6 位数字验证码

复制package main

import (
	"crypto/hmac"
	"crypto/sha1"
	"encoding/binary"
	"encoding/base32"
	"fmt"
	"time"
	"strings"
)

func main() {
	secret := "JBSWY3DPEHPK3PXP"
	// 解码 Base32 密钥，忽略填充
	key, _ := base32.StdEncoding.WithPadding(base32.NoPadding).DecodeString(secret)

	t := uint64(time.Now().Unix()) / 30
	msg := make([]byte, 8)
	binary.BigEndian.PutUint64(msg, t)

	mac := hmac.New(sha1.New, key)
	mac.Write(msg)
	hash := mac.Sum(nil)

	offset := hash[len(hash)-1] & 0x0F
	code := (binary.BigEndian.Uint32(hash[offset:offset+4]) & 0x7FFFFFFF) % 1000000
	fmt.Printf("%06d\n", code)
}

复制const crypto = require('crypto');

// 基于 RFC 6238 生成 TOTP 验证码
const secret = 'JBSWY3DPEHPK3PXP';
const key = Buffer.from(secret, 'base64');  // 注意：实际应使用 base32 解码，此处简化

const t = Math.floor(Date.now() / 1000 / 30);
const msg = Buffer.alloc(8);
msg.writeBigUInt64BE(BigInt(t), 0);

const h = crypto.createHmac('sha1', key).update(msg).digest();
const offset = h[h.length - 1] & 0x0F;
const code = (h.readUInt32BE(offset) & 0x7FFFFFFF) % 1000000;
console.log(String(code).padStart(6, '0'));