Initial Commit

Internal Link Generation

util/crypto.go

@@ -0,0 +1,62 @@
+package util
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"encoding/base64"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+)
+
+func getKey() string {
+	key := []byte("4bUMVpSJjvjwEC7qV2AQjvjwEC7qV2AQ")
+	return hex.EncodeToString(key)
+}
+func Encrypt(input string) (string, error) {
+	btKey, _ := hex.DecodeString(getKey())
+	plaintext := []byte(input)
+
+	// Create a new Cipher Block from the key
+	block, err := aes.NewCipher(btKey)
+	if err != nil {
+		return "", err
+	}
+
+	ciphertext := make([]byte, aes.BlockSize+len(plaintext))
+	iv := ciphertext[:aes.BlockSize]
+	if _, err := io.ReadFull(rand.Reader, iv); err != nil {
+		return "", err
+	}
+
+	stream := cipher.NewCFBEncrypter(block, iv)
+	stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext)
+
+	// Convert to base64
+	return base64.URLEncoding.EncodeToString(ciphertext), nil
+}
+
+func Decrypt(input string) (string, error) {
+	btKey, _ := hex.DecodeString(getKey())
+	ciphertext, _ := base64.URLEncoding.DecodeString(input)
+
+	block, err := aes.NewCipher(btKey)
+	if err != nil {
+		return "", err
+	}
+
+	if len(ciphertext) < aes.BlockSize {
+		return "", errors.New("ciphertext is too short")
+	}
+	iv := ciphertext[:aes.BlockSize]
+	ciphertext = ciphertext[aes.BlockSize:]
+
+	stream := cipher.NewCFBDecrypter(block, iv)
+
+	// XORKeyStream can work in-place if the two arguments are the same.
+	stream.XORKeyStream(ciphertext, ciphertext)
+
+	return fmt.Sprintf("%s", ciphertext), nil
+}