From d0e97865ae0499feb63e751b4cb2478c44d93247 Mon Sep 17 00:00:00 2001
From: Richard Levitte <richard@levitte.org>
Date: Wed, 17 Feb 2016 12:32:16 +0100
Subject: [PATCH] Get ASN.1 IV using public functions

The function EVP_CIPHER_get_asn1_iv(), which is the default
get_asn1_params implementation, can be used to set the "original IV".
No need to reach into the inside of EVP_CIPHER_CTX, which makes it
much more future proof.
---
 gost_crypt.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/gost_crypt.c b/gost_crypt.c
index 259939d..8132a1e 100644
--- a/gost_crypt.c
+++ b/gost_crypt.c
@@ -649,7 +649,12 @@ int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
         GOST_CIPHER_PARAMS_free(gcp);
         return -1;
     }
-    memcpy(ctx->oiv, gcp->iv->data, len);
+
+    {
+        ASN1_TYPE tmp;
+        ASN1_TYPE_set(&tmp, V_ASN1_OCTET_STRING, gcp->iv);
+        EVP_CIPHER_get_asn1_iv(ctx, &tmp);
+    }
 
     GOST_CIPHER_PARAMS_free(gcp);
 
-- 
2.39.2