Release v2.2.0

vendor/github.com/fiatjaf/go-lnurl/aes.go

@@ -0,0 +1,48 @@
+package lnurl
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"io"
+)
+
+func AESCipher(key, plaintext []byte) (ciphertext []byte, iv []byte, err error) {
+	pad := aes.BlockSize - (len(plaintext) % aes.BlockSize)
+	padding := make([]byte, pad)
+	for i := 0; i < pad; i++ {
+		padding[i] = byte(pad)
+	}
+	plaintext = append(plaintext, padding...)
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return
+	}
+
+	ciphertext = make([]byte, len(plaintext))
+	iv = make([]byte, aes.BlockSize)
+	if _, err = io.ReadFull(rand.Reader, iv); err != nil {
+		return
+	}
+
+	cbc := cipher.NewCBCEncrypter(block, iv)
+	cbc.CryptBlocks(ciphertext, plaintext)
+	return
+}
+
+func AESDecipher(key, ciphertext, iv []byte) (plaintext []byte, err error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return
+	}
+
+	mode := cipher.NewCBCDecrypter(block, iv)
+	mode.CryptBlocks(ciphertext, ciphertext)
+
+	size := len(ciphertext)
+	pad := ciphertext[size-1]
+	plaintext = ciphertext[:size-int(pad)]
+
+	return plaintext, nil
+}