manishtpatel · October 18, 2023 03:12 · Jan 2, 2014 · Jan 2, 2014
diff --git a/main.go b/main.go
@@ -46,12 +46,12 @@ func encrypt(key []byte, text string) string {
 	stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext)
 
 	// convert to base64
-	return base64.StdEncoding.EncodeToString(ciphertext)
+	return base64.URLEncoding.EncodeToString(ciphertext)
 }
 
 // decrypt from base64 to decrypted string
 func decrypt(key []byte, cryptoText string) string {
-	ciphertext, _ := base64.StdEncoding.DecodeString(cryptoText)
+	ciphertext, _ := base64.URLEncoding.DecodeString(cryptoText)
 
 	block, err := aes.NewCipher(key)
 	if err != nil {

diff --git a/main.go b/main.go
@@ -0,0 +1,75 @@
+package main
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"encoding/base64"
+	"fmt"
+	"io"
+)
+
+func main() {
+	originalText := "encrypt this golang"
+	fmt.Println(originalText)
+
+	key := []byte("example key 1234")
+
+	// encrypt value to base64
+	cryptoText := encrypt(key, originalText)
+	fmt.Println(cryptoText)
+
+	// encrypt base64 crypto to original value
+	text := decrypt(key, cryptoText)
+	fmt.Printf(text)
+}
+
+// encrypt string to base64 crypto using AES
+func encrypt(key []byte, text string) string {
+	// key := []byte(keyText)
+	plaintext := []byte(text)
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		panic(err)
+	}
+
+	// The IV needs to be unique, but not secure. Therefore it's common to
+	// include it at the beginning of the ciphertext.
+	ciphertext := make([]byte, aes.BlockSize+len(plaintext))
+	iv := ciphertext[:aes.BlockSize]
+	if _, err := io.ReadFull(rand.Reader, iv); err != nil {
+		panic(err)
+	}
+
+	stream := cipher.NewCFBEncrypter(block, iv)
+	stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext)
+
+	// convert to base64
+	return base64.StdEncoding.EncodeToString(ciphertext)
+}
+
+// decrypt from base64 to decrypted string
+func decrypt(key []byte, cryptoText string) string {
+	ciphertext, _ := base64.StdEncoding.DecodeString(cryptoText)
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		panic(err)
+	}
+
+	// The IV needs to be unique, but not secure. Therefore it's common to
+	// include it at the beginning of the ciphertext.
+	if len(ciphertext) < aes.BlockSize {
+		panic("ciphertext 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)
+}