58 lines
1.3 KiB
Go
58 lines
1.3 KiB
Go
package security
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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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type Encryptor struct{ key []byte }
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func NewEncryptor(encodedKey string) (*Encryptor, error) {
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key, err := base64.StdEncoding.DecodeString(encodedKey)
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if err != nil || len(key) != 32 {
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return nil, errors.New("CONFIG_ENCRYPTION_KEY 必须是 32 字节随机值的 Base64 编码")
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}
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return &Encryptor{key: key}, nil
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}
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func (e *Encryptor) Encrypt(plain string) (string, error) {
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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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sealed := gcm.Seal(nonce, nonce, []byte(plain), nil)
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return base64.RawStdEncoding.EncodeToString(sealed), nil
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}
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func (e *Encryptor) Decrypt(encoded string) (string, error) {
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data, err := base64.RawStdEncoding.DecodeString(encoded)
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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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if len(data) < gcm.NonceSize() {
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return "", errors.New("密文无效")
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}
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plain, err := gcm.Open(nil, data[:gcm.NonceSize()], data[gcm.NonceSize():], nil)
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return string(plain), err
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}
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