85 lines
1.8 KiB
Go
85 lines
1.8 KiB
Go
package secrets
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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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"fmt"
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"io"
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"log/slog"
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)
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type Secrets struct {
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Logger *slog.Logger
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EncryptionKey []byte
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}
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func New(logger *slog.Logger, key []byte) *Secrets {
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return &Secrets{
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Logger: logger,
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EncryptionKey: key,
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}
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}
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// Encrypt function that encrypts data using AES256-GCM and returns base64 encoded ciphertext
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func (s *Secrets) Encrypt(plainText []byte) (string, error) {
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block, err := aes.NewCipher(s.EncryptionKey)
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if err != nil {
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return "", err
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}
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// Create a new GCM cipher
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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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// Create a nonce
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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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// Encrypt the plaintext using AES256-GCM
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cipherText := gcm.Seal(nonce, nonce, plainText, nil)
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// Return the base64 encoded ciphertext
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return base64.StdEncoding.EncodeToString(cipherText), nil
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}
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// Decrypt function that decrypts base64 encoded AES256-GCM ciphertext
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func (s *Secrets) Decrypt(base64CipherText string) ([]byte, error) {
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// Decode the base64 ciphertext
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cipherText, err := base64.StdEncoding.DecodeString(base64CipherText)
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if err != nil {
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return nil, err
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}
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block, err := aes.NewCipher(s.EncryptionKey)
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if err != nil {
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return nil, err
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}
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// Create a new GCM cipher
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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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// Extract the nonce from the ciphertext
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nonceSize := gcm.NonceSize()
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if len(cipherText) < nonceSize {
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return nil, fmt.Errorf("ciphertext is too short")
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}
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nonce, cipherText := cipherText[:nonceSize], cipherText[nonceSize:]
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// Decrypt the ciphertext
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plainText, err := gcm.Open(nil, nonce, cipherText, nil)
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if err != nil {
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return nil, err
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}
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return plainText, nil
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}
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