103 lines
2.2 KiB
Go
103 lines
2.2 KiB
Go
package paymentconfig
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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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"encoding/base64"
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"errors"
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"io"
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)
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// Encryptor 密钥加密器接口
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type Encryptor interface {
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Encrypt(plaintext string) (string, error)
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Decrypt(ciphertext string) (string, error)
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}
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// AESEncryptor AES 加密器
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type AESEncryptor struct {
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key []byte
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}
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// NewAESEncryptor 创建 AES 加密器
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// key 必须是 16、24 或 32 字节（对应 AES-128、AES-192、AES-256）
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func NewAESEncryptor(key string) (*AESEncryptor, error) {
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keyBytes := []byte(key)
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if len(keyBytes) != 16 && len(keyBytes) != 24 && len(keyBytes) != 32 {
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return nil, errors.New("invalid key length: must be 16, 24, or 32 bytes")
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}
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return &AESEncryptor{key: keyBytes}, nil
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}
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// Encrypt 加密明文（使用 AES-GCM）
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func (e *AESEncryptor) Encrypt(plaintext string) (string, error) {
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if plaintext == "" {
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return "", nil
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}
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block, err := aes.NewCipher(e.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 解密密文（使用 AES-GCM）
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func (e *AESEncryptor) Decrypt(ciphertext string) (string, error) {
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if ciphertext == "" {
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return "", nil
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}
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ciphertextBytes, err := base64.StdEncoding.DecodeString(ciphertext)
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if err != nil {
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return "", err
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}
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block, err := aes.NewCipher(e.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(ciphertextBytes) < nonceSize {
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return "", errors.New("ciphertext too short")
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}
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nonce, ciphertextBytes := ciphertextBytes[:nonceSize], ciphertextBytes[nonceSize:]
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plaintext, err := gcm.Open(nil, nonce, ciphertextBytes, nil)
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if err != nil {
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return "", err
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}
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return string(plaintext), nil
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}
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// MockEncryptor 模拟加密器（用于测试）
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type MockEncryptor struct{}
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func (e *MockEncryptor) Encrypt(plaintext string) (string, error) {
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return plaintext, nil
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}
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func (e *MockEncryptor) Decrypt(ciphertext string) (string, error) {
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return ciphertext, nil
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}
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