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0bb52883eb
Help some users like #16832 #1851 There are many users reporting similar problem: if the SECRET_KEY mismatches, some operations (like 2FA login) only reports unclear 500 error and unclear "base64 decode error" log （some maintainers ever spent a lot of time on debugging such problem) The SECRET_KEY was not well-designed and it is also a kind of technical debt. Since it couldn't be fixed easily, it's good to add clearer error messages, then at least users could know what the real problem is. --------- Co-authored-by: delvh <dev.lh@web.de>
79 lines
2.3 KiB
Go
79 lines
2.3 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package secret
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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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"encoding/hex"
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"errors"
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"fmt"
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"io"
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"github.com/minio/sha256-simd"
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)
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// AesEncrypt encrypts text and given key with AES.
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func AesEncrypt(key, text []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, fmt.Errorf("AesEncrypt invalid key: %v", err)
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}
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b := base64.StdEncoding.EncodeToString(text)
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ciphertext := make([]byte, aes.BlockSize+len(b))
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iv := ciphertext[:aes.BlockSize]
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if _, err = io.ReadFull(rand.Reader, iv); err != nil {
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return nil, fmt.Errorf("AesEncrypt unable to read IV: %w", err)
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}
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cfb := cipher.NewCFBEncrypter(block, iv)
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cfb.XORKeyStream(ciphertext[aes.BlockSize:], []byte(b))
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return ciphertext, nil
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}
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// AesDecrypt decrypts text and given key with AES.
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func AesDecrypt(key, text []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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if len(text) < aes.BlockSize {
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return nil, errors.New("AesDecrypt ciphertext too short")
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}
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iv := text[:aes.BlockSize]
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text = text[aes.BlockSize:]
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cfb := cipher.NewCFBDecrypter(block, iv)
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cfb.XORKeyStream(text, text)
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data, err := base64.StdEncoding.DecodeString(string(text))
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if err != nil {
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return nil, fmt.Errorf("AesDecrypt invalid decrypted base64 string: %w", err)
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}
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return data, nil
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}
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// EncryptSecret encrypts a string with given key into a hex string
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func EncryptSecret(key, str string) (string, error) {
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keyHash := sha256.Sum256([]byte(key))
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plaintext := []byte(str)
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ciphertext, err := AesEncrypt(keyHash[:], plaintext)
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if err != nil {
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return "", fmt.Errorf("failed to encrypt by secret: %w", err)
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}
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return hex.EncodeToString(ciphertext), nil
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}
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// DecryptSecret decrypts a previously encrypted hex string
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func DecryptSecret(key, cipherHex string) (string, error) {
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keyHash := sha256.Sum256([]byte(key))
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ciphertext, err := hex.DecodeString(cipherHex)
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if err != nil {
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return "", fmt.Errorf("failed to decrypt by secret, invalid hex string: %w", err)
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}
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plaintext, err := AesDecrypt(keyHash[:], ciphertext)
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if err != nil {
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return "", fmt.Errorf("failed to decrypt by secret, the key (maybe SECRET_KEY?) might be incorrect: %w", err)
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}
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return string(plaintext), nil
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}
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