From 20ed2db606b3e326ae7cd7bf5017c02dc81b5eb5 Mon Sep 17 00:00:00 2001
From: s-s-L-L <xiaoshitou-leilei@163.com>
Date: Wed, 24 Aug 2022 12:56:53 +0800
Subject: [PATCH] fix cbc bug

---
 src/sm4_modes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sm4_modes.c b/src/sm4_modes.c
index a442be4c..d66b72e2 100644
--- a/src/sm4_modes.c
+++ b/src/sm4_modes.c
@@ -294,7 +294,7 @@ int sm4_cbc_decrypt_update(SM4_CBC_CTX *ctx,
 	}
 
 	*outlen = 0;
-	if (ctx->block_nbytes < SM4_BLOCK_SIZE) {
+	if (ctx->block_nbytes) {
 		left = SM4_BLOCK_SIZE - ctx->block_nbytes;
 		if (inlen <= left) {
 			memcpy(ctx->block + ctx->block_nbytes, in, inlen);