From edd431beb779e95ccff14114367e2fe7bf5d4f7a Mon Sep 17 00:00:00 2001
From: Sergey Matveev <stargrave@stargrave.org>
Date: Fri, 26 Jul 2019 11:38:03 +0300
Subject: [PATCH] Do not overwrite IVs slice memory

---
 src/cypherpunks.ru/gogost/gost28147/cfb.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/cypherpunks.ru/gogost/gost28147/cfb.go b/src/cypherpunks.ru/gogost/gost28147/cfb.go
index b7b6050..902d12d 100644
--- a/src/cypherpunks.ru/gogost/gost28147/cfb.go
+++ b/src/cypherpunks.ru/gogost/gost28147/cfb.go
@@ -25,6 +25,9 @@ func (c *Cipher) NewCFBEncrypter(iv []byte) *CFBEncrypter {
 	if len(iv) != BlockSize {
 		panic("iv length is not equal to blocksize")
 	}
+	encrypter := CFBEncrypter{c: c, iv: make([]byte, BlockSize)}
+	copy(encrypter.iv, iv)
+	return &encrypter
 }
 
 func (c *CFBEncrypter) XORKeyStream(dst, src []byte) {
@@ -54,6 +57,9 @@ func (c *Cipher) NewCFBDecrypter(iv []byte) *CFBDecrypter {
 	if len(iv) != BlockSize {
 		panic("iv length is not equal to blocksize")
 	}
+	decrypter := CFBDecrypter{c: c, iv: make([]byte, BlockSize)}
+	copy(decrypter.iv, iv)
+	return &decrypter
 }
 
 func (c *CFBDecrypter) XORKeyStream(dst, src []byte) {
-- 
2.44.0