domrichardson
73 lines
1.6 KiB
Go
73 lines
1.6 KiB
Go
package services
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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/hex"
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"fmt"
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"io"
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"os"
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)
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func encryptionKey() ([]byte, error) {
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raw := os.Getenv("KEY_ENCRYPTION_KEY")
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if raw == "" {
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return nil, fmt.Errorf("KEY_ENCRYPTION_KEY is not set")
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}
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key, err := hex.DecodeString(raw)
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if err != nil || len(key) != 32 {
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return nil, fmt.Errorf("KEY_ENCRYPTION_KEY must be a 64-character hex string (32 bytes)")
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}
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return key, nil
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}
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func encryptPrivateKey(plaintext string) (string, error) {
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key, err := encryptionKey()
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if err != nil {
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return "", err
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", 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 "", 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 "", err
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}
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sealed := gcm.Seal(nonce, nonce, []byte(plaintext), nil)
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return hex.EncodeToString(sealed), nil
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}
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func decryptPrivateKey(ciphertextHex string) (string, error) {
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key, err := encryptionKey()
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if err != nil {
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return "", err
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}
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data, err := hex.DecodeString(ciphertextHex)
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if err != nil {
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return "", fmt.Errorf("invalid ciphertext encoding")
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", 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 "", err
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}
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nonceSize := gcm.NonceSize()
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if len(data) < nonceSize {
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return "", fmt.Errorf("ciphertext too short")
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}
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plaintext, err := gcm.Open(nil, data[:nonceSize], data[nonceSize:], nil)
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if err != nil {
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return "", fmt.Errorf("decryption failed")
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}
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return string(plaintext), nil
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}
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