15e81637ab
- In Go 1.21 the crypto/sha256 [got a massive
improvement](https://go.dev/doc/go1.21#crypto/sha256) by utilizing the
SHA instructions for AMD64 CPUs, which sha256-simd already was doing.
The performance is now on par and I think it's preferable to use the
standard library rather than a package when possible.
```
cpu: AMD Ryzen 5 3600X 6-Core Processor
│ simd.txt │ go.txt │
│ sec/op │ sec/op vs base │
Hash/8Bytes-12 63.25n ± 1% 73.38n ± 1% +16.02% (p=0.002 n=6)
Hash/64Bytes-12 98.73n ± 1% 105.30n ± 1% +6.65% (p=0.002 n=6)
Hash/1K-12 567.2n ± 1% 572.8n ± 1% +0.99% (p=0.002 n=6)
Hash/8K-12 4.062µ ± 1% 4.062µ ± 1% ~ (p=0.396 n=6)
Hash/1M-12 512.1µ ± 0% 510.6µ ± 1% ~ (p=0.485 n=6)
Hash/5M-12 2.556m ± 1% 2.564m ± 0% ~ (p=0.093 n=6)
Hash/10M-12 5.112m ± 0% 5.127m ± 0% ~ (p=0.093 n=6)
geomean 13.82µ 14.27µ +3.28%
│ simd.txt │ go.txt │
│ B/s │ B/s vs base │
Hash/8Bytes-12 120.6Mi ± 1% 104.0Mi ± 1% -13.81% (p=0.002 n=6)
Hash/64Bytes-12 618.2Mi ± 1% 579.8Mi ± 1% -6.22% (p=0.002 n=6)
Hash/1K-12 1.682Gi ± 1% 1.665Gi ± 1% -0.98% (p=0.002 n=6)
Hash/8K-12 1.878Gi ± 1% 1.878Gi ± 1% ~ (p=0.310 n=6)
Hash/1M-12 1.907Gi ± 0% 1.913Gi ± 1% ~ (p=0.485 n=6)
Hash/5M-12 1.911Gi ± 1% 1.904Gi ± 0% ~ (p=0.093 n=6)
Hash/10M-12 1.910Gi ± 0% 1.905Gi ± 0% ~ (p=0.093 n=6)
geomean 1.066Gi 1.032Gi -3.18%
```
(cherry picked from commit abd94ff5b5)
78 lines
2.3 KiB
Go
78 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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"crypto/sha256"
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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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)
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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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