From 8a25134c8257859482a990b963e6f1b68d77944e Mon Sep 17 00:00:00 2001
From: Sun Yimin <emmansun@users.noreply.github.com>
Date: Wed, 26 Feb 2025 10:24:46 +0800
Subject: [PATCH] sm4: fallback ctr change

---
 sm4/ctr_cipher_asm.go | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sm4/ctr_cipher_asm.go b/sm4/ctr_cipher_asm.go
index 8920568..89ef8b9 100644
--- a/sm4/ctr_cipher_asm.go
+++ b/sm4/ctr_cipher_asm.go
@@ -34,17 +34,18 @@ func (c *sm4CipherAsm) NewCTR(iv []byte) cipher.Stream {
 	}
 	s := &ctr{
 		b:       c,
-		ctr:     bytes.Clone(iv),
+		ctr:     make([]byte, c.blocksSize),
 		out:     make([]byte, 0, bufSize),
 		outUsed: 0,
 	}
+	copy(s.ctr, iv)
 	for i := 1; i < c.batchBlocks; i++ {
 		s.genCtr(i * BlockSize)
 	}
 	return s
-
 }
 
+
 func (x *ctr) genCtr(start int) {
 	if start >= BlockSize {
 		copy(x.ctr[start:], x.ctr[start-BlockSize:start])