added utils, templates, routes, types, middleware, processors and a whole lot of things for a basic login page

1 files changed, 71 insertions, 0 deletions

diff --git a/utils/crypto/crypto.go b/utils/crypto/crypto.go
new file mode 100644
index 0000000..54d2eec
--- /dev/null
+++ b/utils/crypto/crypto.go
@@ -0,0 +1,71 @@
+package crypto
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+	"io"
+	"lain/config"
+)
+
+func getKey() []byte {
+	hash := sha256.Sum256([]byte(config.Server.AppSecret))
+	return hash[:]
+}
+
+func Encrypt(plaintext string) (string, error) {
+	key := getKey()
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return "", err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return "", err
+	}
+
+	nonce := make([]byte, gcm.NonceSize())
+	if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
+		return "", err
+	}
+
+	ciphertext := gcm.Seal(nonce, nonce, []byte(plaintext), nil)
+	return base64.URLEncoding.EncodeToString(ciphertext), nil
+}
+
+func Decrypt(ciphertext string) (string, error) {
+	key := getKey()
+
+	ciphertextBytes, err := base64.URLEncoding.DecodeString(ciphertext)
+	if err != nil {
+		return "", err
+	}
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return "", err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return "", err
+	}
+
+	nonceSize := gcm.NonceSize()
+	if len(ciphertextBytes) < nonceSize {
+		return "", fmt.Errorf("ciphertext too short")
+	}
+
+	nonce, ciphertextBytes := ciphertextBytes[:nonceSize], ciphertextBytes[nonceSize:]
+	plaintextBytes, err := gcm.Open(nil, nonce, ciphertextBytes, nil)
+	if err != nil {
+		return "", err
+	}
+
+	return string(plaintextBytes), nil
+}