From 6b225af832e0f0a8793a0497eb891c089006e9f9 Mon Sep 17 00:00:00 2001
From: Johan de Klerk <johan@shiplogic.com>
Date: Mon, 24 Oct 2022 13:44:41 +0200
Subject: [PATCH] Encrypt and decrypt text
---
encryption/encryption.go | 44 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/encryption/encryption.go b/encryption/encryption.go
index fd5959d..12eb442 100644
--- a/encryption/encryption.go
+++ b/encryption/encryption.go
@@ -1,11 +1,16 @@
package encryption
import (
+ "crypto/aes"
+ "crypto/cipher"
"crypto/hmac"
"crypto/md5"
+ "crypto/rand"
"crypto/sha256"
"encoding/base64"
"fmt"
+ "gitlab.bob.co.za/bob-public-utils/bobgroup-go-utils/errors"
+ "io"
)
func Hash(input string, key string) string {
@@ -20,3 +25,42 @@ func Md5HashString(bytesToHash []byte) string {
hashString := fmt.Sprintf("%X", hash)
return hashString
}
+
+func Encrypt(plaintext string, key string) (string, error) {
+ c, err := aes.NewCipher([]byte(key))
+ if err != nil {
+ return "", err
+ }
+
+ gcm, err := cipher.NewGCM(c)
+ if err != nil {
+ return "", err
+ }
+
+ nonce := make([]byte, gcm.NonceSize())
+ if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
+ return "", err
+ }
+
+ return string(gcm.Seal(nonce, nonce, []byte(plaintext), nil)), nil
+}
+
+func Decrypt(ciphertext string, key string) ([]byte, error) {
+ c, err := aes.NewCipher([]byte(key))
+ if err != nil {
+ return nil, err
+ }
+
+ gcm, err := cipher.NewGCM(c)
+ if err != nil {
+ return nil, err
+ }
+
+ nonceSize := gcm.NonceSize()
+ if len(ciphertext) < nonceSize {
+ return nil, errors.New("ciphertext too short")
+ }
+
+ nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
+ return gcm.Open(nil, []byte(nonce), []byte(ciphertext), nil)
+}
--
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