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//
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// Copyright (C) 2024 veypi <i@veypi.com>
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// 2025-03-04 16:08:06
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// Distributed under terms of the MIT license.
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//
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package crypto
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"crypto/sha256"
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"encoding/base64"
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"fmt"
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"io"
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"golang.org/x/crypto/bcrypt"
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)
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// HashPassword 使用bcrypt哈希密码
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func HashPassword(password string, cost int) (string, error) {
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bytes, err := bcrypt.GenerateFromPassword([]byte(password), cost)
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if err != nil {
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return "", fmt.Errorf("failed to hash password: %w", err)
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}
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return string(bytes), nil
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}
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// VerifyPassword 验证密码
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func VerifyPassword(password, hash string) bool {
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err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
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return err == nil
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}
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// GenerateRandomString 生成随机字符串
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func GenerateRandomString(length int) (string, error) {
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bytes := make([]byte, length)
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if _, err := rand.Read(bytes); err != nil {
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return "", err
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}
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return base64.URLEncoding.EncodeToString(bytes)[:length], nil
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}
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// GenerateSecret 生成密钥
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func GenerateSecret(length int) string {
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const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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bytes := make([]byte, length)
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rand.Read(bytes)
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for i, b := range bytes {
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bytes[i] = charset[b%byte(len(charset))]
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}
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return string(bytes)
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}
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// GenerateClientID 生成OAuth客户端ID
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func GenerateClientID() string {
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return "vc_" + GenerateSecret(28)
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}
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// GenerateClientSecret 生成OAuth客户端密钥
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func GenerateClientSecret() string {
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return GenerateSecret(64)
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}
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// deriveKey 从密钥字符串派生32字节AES密钥
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func deriveKey(key string) []byte {
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hash := sha256.Sum256([]byte(key))
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return hash[:]
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}
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// Encrypt 使用AES-GCM加密数据
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// key: 加密密钥（会被派生为32字节）
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// plaintext: 明文数据
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// 返回: base64编码的密文（包含nonce）
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func Encrypt(key, plaintext string) (string, error) {
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if key == "" || plaintext == "" {
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return "", fmt.Errorf("key and plaintext cannot be empty")
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}
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block, err := aes.NewCipher(deriveKey(key))
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if err != nil {
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return "", err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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nonce := make([]byte, gcm.NonceSize())
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if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
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return "", err
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}
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ciphertext := gcm.Seal(nonce, nonce, []byte(plaintext), nil)
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return base64.StdEncoding.EncodeToString(ciphertext), nil
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}
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// Decrypt 使用AES-GCM解密数据
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// key: 解密密钥
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// ciphertext: base64编码的密文（包含nonce）
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// 返回: 明文数据
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func Decrypt(key, ciphertext string) (string, error) {
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if key == "" || ciphertext == "" {
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return "", fmt.Errorf("key and ciphertext cannot be empty")
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}
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data, err := base64.StdEncoding.DecodeString(ciphertext)
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if err != nil {
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return "", fmt.Errorf("failed to decode ciphertext: %w", err)
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}
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block, err := aes.NewCipher(deriveKey(key))
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if err != nil {
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return "", err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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nonceSize := gcm.NonceSize()
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if len(data) < nonceSize {
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return "", fmt.Errorf("ciphertext too short")
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}
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nonce, encrypted := data[:nonceSize], data[nonceSize:]
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plaintext, err := gcm.Open(nil, nonce, encrypted, nil)
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if err != nil {
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return "", fmt.Errorf("failed to decrypt: %w", err)
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}
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return string(plaintext), nil
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}
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