mirror of https://github.com/gofiber/fiber.git
99 lines
2.3 KiB
Go
99 lines
2.3 KiB
Go
package encryptcookie
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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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"fmt"
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"io"
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)
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// EncryptCookie Encrypts a cookie value with specific encryption key
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func EncryptCookie(value, key string) (string, error) {
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keyDecoded, err := base64.StdEncoding.DecodeString(key)
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if err != nil {
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return "", fmt.Errorf("failed to base64-decode key: %w", err)
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}
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block, err := aes.NewCipher(keyDecoded)
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if err != nil {
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return "", fmt.Errorf("failed to create AES cipher: %w", 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 "", fmt.Errorf("failed to create GCM mode: %w", 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 "", fmt.Errorf("failed to read: %w", err)
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}
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ciphertext := gcm.Seal(nonce, nonce, []byte(value), nil)
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return base64.StdEncoding.EncodeToString(ciphertext), nil
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}
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// DecryptCookie Decrypts a cookie value with specific encryption key
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func DecryptCookie(value, key string) (string, error) {
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keyDecoded, err := base64.StdEncoding.DecodeString(key)
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if err != nil {
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return "", fmt.Errorf("failed to base64-decode key: %w", err)
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}
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enc, err := base64.StdEncoding.DecodeString(value)
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if err != nil {
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return "", fmt.Errorf("failed to base64-decode value: %w", err)
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}
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block, err := aes.NewCipher(keyDecoded)
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if err != nil {
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return "", fmt.Errorf("failed to create AES cipher: %w", 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 "", fmt.Errorf("failed to create GCM mode: %w", err)
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}
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nonceSize := gcm.NonceSize()
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if len(enc) < nonceSize {
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return "", errors.New("encrypted value is not valid")
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}
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nonce, ciphertext := enc[:nonceSize], enc[nonceSize:]
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plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return "", fmt.Errorf("failed to decrypt ciphertext: %w", err)
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}
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return string(plaintext), nil
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}
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// GenerateKey Generates an encryption key
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func GenerateKey() string {
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const keyLen = 32
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ret := make([]byte, keyLen)
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if _, err := rand.Read(ret); err != nil {
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panic(err)
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}
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return base64.StdEncoding.EncodeToString(ret)
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}
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// Check given cookie key is disabled for encryption or not
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func isDisabled(key string, except []string) bool {
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for _, k := range except {
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if key == k {
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return true
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}
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}
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return false
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}
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