From: Vitaly Chikunov <vt@altlinux.org>
Date: Thu, 13 Sep 2018 00:26:19 +0000 (+0300)
Subject: Fix in-place decryption for CBC mode
X-Git-Tag: v3.0.0~344^2~1
X-Git-Url: http://wagner.pp.ru/gitweb/?a=commitdiff_plain;ds=inline;h=ff6364a8907b15684e685e8d7984088cfb4c74b4;p=openssl-gost%2Fengine.git

Fix in-place decryption for CBC mode
---

diff --git a/gost_grasshopper_cipher.c b/gost_grasshopper_cipher.c
index 0d0eacb..a045a92 100644
--- a/gost_grasshopper_cipher.c
+++ b/gost_grasshopper_cipher.c
@@ -365,11 +365,14 @@ int gost_grasshopper_cipher_do_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out,
                                       currentOutputBlock, &c->buffer);
             grasshopper_copy128(currentBlock, currentOutputBlock);
         } else {
+            grasshopper_w128_t tmp;
+
+            grasshopper_copy128(&tmp, currentInputBlock);
             grasshopper_decrypt_block(&c->decrypt_round_keys,
                                       currentInputBlock, currentOutputBlock,
                                       &c->buffer);
             grasshopper_append128(currentOutputBlock, currentBlock);
-            grasshopper_copy128(currentBlock, currentInputBlock);
+            grasshopper_copy128(currentBlock, &tmp);
         }
     }