fd0c9a1305
Without TOTP_ENCRYPTION_KEY, saved payment configs were lost on restart because the AES round-trip failed silently. Write new records as plaintext JSON; read path tries JSON first, falls back to legacy AES decrypt when a key is present, and treats unreadable values as empty so admins can re-enter them via the UI.
102 lines
2.8 KiB
Go
102 lines
2.8 KiB
Go
package payment
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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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"strings"
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)
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// AES256KeySize is the required key length (in bytes) for AES-256-GCM.
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const AES256KeySize = 32
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// Encrypt encrypts plaintext using AES-256-GCM with the given 32-byte key.
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// The output format is "iv:authTag:ciphertext" where each component is base64-encoded,
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// matching the Node.js crypto.ts format for cross-compatibility.
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func Encrypt(plaintext string, key []byte) (string, error) {
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if len(key) != AES256KeySize {
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return "", fmt.Errorf("encryption key must be %d bytes, got %d", AES256KeySize, len(key))
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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 "", fmt.Errorf("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("create GCM: %w", err)
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}
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nonce := make([]byte, gcm.NonceSize()) // 12 bytes for GCM
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if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
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return "", fmt.Errorf("generate nonce: %w", err)
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}
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// Seal appends the ciphertext + auth tag
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sealed := gcm.Seal(nil, nonce, []byte(plaintext), nil)
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// Split sealed into ciphertext and auth tag (last 16 bytes)
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tagSize := gcm.Overhead()
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ciphertext := sealed[:len(sealed)-tagSize]
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authTag := sealed[len(sealed)-tagSize:]
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// Format: iv:authTag:ciphertext (all base64)
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return fmt.Sprintf("%s:%s:%s",
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base64.StdEncoding.EncodeToString(nonce),
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base64.StdEncoding.EncodeToString(authTag),
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base64.StdEncoding.EncodeToString(ciphertext),
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), nil
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}
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// Decrypt decrypts a ciphertext string produced by Encrypt.
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// The input format is "iv:authTag:ciphertext" where each component is base64-encoded.
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func Decrypt(ciphertext string, key []byte) (string, error) {
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if len(key) != AES256KeySize {
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return "", fmt.Errorf("encryption key must be %d bytes, got %d", AES256KeySize, len(key))
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}
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parts := strings.SplitN(ciphertext, ":", 3)
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if len(parts) != 3 {
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return "", fmt.Errorf("invalid ciphertext format: expected iv:authTag:ciphertext")
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}
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nonce, err := base64.StdEncoding.DecodeString(parts[0])
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if err != nil {
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return "", fmt.Errorf("decode IV: %w", err)
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}
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authTag, err := base64.StdEncoding.DecodeString(parts[1])
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if err != nil {
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return "", fmt.Errorf("decode auth tag: %w", err)
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}
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encrypted, err := base64.StdEncoding.DecodeString(parts[2])
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if err != nil {
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return "", fmt.Errorf("decode ciphertext: %w", 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 "", fmt.Errorf("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("create GCM: %w", err)
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}
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// Reconstruct the sealed data: ciphertext + authTag
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sealed := append(encrypted, authTag...)
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plaintext, err := gcm.Open(nil, nonce, sealed, nil)
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if err != nil {
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return "", fmt.Errorf("decrypt: %w", err)
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}
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return string(plaintext), nil
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}
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