From 874d48d88c6b69c7f2f6765b0c9bfae6585ac8e4 Mon Sep 17 00:00:00 2001
From: Wolfgang Beck <beck.wolfgang@oracle.com>
Date: Fri, 9 Oct 2020 16:57:03 +1000
Subject: [PATCH] fix_cbc_281

---
 gost_crypt.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gost_crypt.c b/gost_crypt.c
index feca0b6..213b285 100644
--- a/gost_crypt.c
+++ b/gost_crypt.c
@@ -575,11 +575,13 @@ static int gost_cipher_do_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out,
         }
     } else {
         while (inl > 0) {
+            unsigned char tmpiv[8];
             gostdecrypt(&(c->cctx), in_ptr, b);
+            memcpy(tmpiv, in_ptr, 8);
             for (i = 0; i < 8; i++) {
                 out_ptr[i] = iv[i] ^ b[i];
             }
-            memcpy(iv, in_ptr, 8);
+            memcpy(iv, tmpiv, 8);
             out_ptr += 8;
             in_ptr += 8;
             inl -= 8;
-- 
2.39.2