57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
package service
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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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"errors"
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"io"
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)
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// SecretCodec 使用应用主密钥加密落库的第三方密钥，避免明文存储。
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type SecretCodec struct {
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gcm cipher.AEAD
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}
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func NewSecretCodec(masterKey string) (*SecretCodec, error) {
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if masterKey == "" {
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return nil, errors.New("数据加密主密钥不能为空")
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}
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sum := sha256.Sum256([]byte(masterKey))
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block, err := aes.NewCipher(sum[:])
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if err != nil {
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return nil, 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 nil, err
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}
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return &SecretCodec{gcm: gcm}, nil
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}
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func (c *SecretCodec) Encrypt(plain string) (string, error) {
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nonce := make([]byte, c.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 := c.gcm.Seal(nil, nonce, []byte(plain), nil)
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return base64.RawURLEncoding.EncodeToString(append(nonce, sealed...)), nil
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}
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func (c *SecretCodec) Decrypt(ciphertext string) (string, error) {
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raw, err := base64.RawURLEncoding.DecodeString(ciphertext)
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if err != nil {
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return "", errors.New("密钥密文格式错误")
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}
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if len(raw) < c.gcm.NonceSize() {
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return "", errors.New("密钥密文长度错误")
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}
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plain, err := c.gcm.Open(nil, raw[:c.gcm.NonceSize()], raw[c.gcm.NonceSize():], nil)
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if err != nil {
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return "", errors.New("密钥解密失败")
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}
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return string(plain), nil
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}
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