From 366b60b9dad44041589fe405ad894e82b409abf9 Mon Sep 17 00:00:00 2001
From: Andy Polyakov <appro@openssl.org>
Date: Sat, 19 Jan 2013 18:24:03 +0100
Subject: [PATCH] engines/ccgost: GOST fixes [from master].

Submitted by: Dmitry Belyavsky, Seguei Leontiev
PR: 2821
---
 engines/ccgost/gost89.c     | 14 +++++++++++++-
 engines/ccgost/gost_crypt.c | 29 +++++++++++++++++++++++------
 engines/ccgost/gost_lcl.h   |  4 ++--
 3 files changed, 38 insertions(+), 9 deletions(-)

diff --git a/engines/ccgost/gost89.c b/engines/ccgost/gost89.c
index 7ebae0f71f..b0568c6b3c 100644
--- a/engines/ccgost/gost89.c
+++ b/engines/ccgost/gost89.c
@@ -369,7 +369,13 @@ int gost_mac(gost_ctx *ctx,int mac_len,const unsigned char *data,
 		memset(buf2,0,8);
 		memcpy(buf2,data+i,data_len-i);
 		mac_block(ctx,buffer,buf2);
-		}	
+		i+=8;
+		}
+	if (i==8)
+		{
+		memset(buf2,0,8);
+		mac_block(ctx,buffer,buf2);
+		}
 	get_mac(buffer,mac_len,mac);
 	return 1;
 	}
@@ -389,7 +395,13 @@ int gost_mac_iv(gost_ctx *ctx,int mac_len,const unsigned char *iv,const unsigned
 		memset(buf2,0,8);
 		memcpy(buf2,data+i,data_len-i);
 		mac_block(ctx,buffer,buf2);
+		i+=8;
 		}	
+	if (i==8)
+		{
+		memset(buf2,0,8);
+		mac_block(ctx,buffer,buf2);
+		}
 	get_mac(buffer,mac_len,mac);
 	return 1;
 	}
diff --git a/engines/ccgost/gost_crypt.c b/engines/ccgost/gost_crypt.c
index cde58c0e9b..52aef15acf 100644
--- a/engines/ccgost/gost_crypt.c
+++ b/engines/ccgost/gost_crypt.c
@@ -11,6 +11,14 @@
 #include <openssl/rand.h>
 #include "e_gost_err.h"
 #include "gost_lcl.h"
+
+#if !defined(CCGOST_DEBUG) && !defined(DEBUG)
+# ifndef NDEBUG
+#  define NDEBUG
+# endif
+#endif
+#include <assert.h>
+
 static int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, 
 	const unsigned char *iv, int enc);
 static int	gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
@@ -206,12 +214,13 @@ int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 static void gost_crypt_mesh (void *ctx,unsigned char *iv,unsigned char *buf)
 	{
 	struct ossl_gost_cipher_ctx *c = ctx;
-	if (c->count&&c->key_meshing && c->count%1024==0)
+	assert(c->count%8 == 0 && c->count <= 1024);
+	if (c->key_meshing && c->count==1024)
 		{
 		cryptopro_key_meshing(&(c->cctx),iv);
 		}	
 	gostcrypt(&(c->cctx),iv,buf);
-	c->count+=8;
+	c->count = c->count%1024 + 8;
 	}
 
 static void gost_cnt_next (void *ctx, unsigned char *iv, unsigned char *buf)
@@ -219,7 +228,8 @@ static void gost_cnt_next (void *ctx, unsigned char *iv, unsigned char *buf)
 	struct ossl_gost_cipher_ctx *c = ctx;
 	word32 g,go;
 	unsigned char buf1[8];
-	if (c->count && c->key_meshing && c->count %1024 ==0)
+	assert(c->count%8 == 0 && c->count <= 1024);
+	if (c->key_meshing && c->count==1024)
 		{
 		cryptopro_key_meshing(&(c->cctx),iv);
 		}
@@ -248,7 +258,7 @@ static void gost_cnt_next (void *ctx, unsigned char *iv, unsigned char *buf)
 	buf1[7]=(unsigned char)((g>>24)&0xff);
 	memcpy(iv,buf1,8);
 	gostcrypt(&(c->cctx),buf1,buf);
-	c->count +=8;
+	c->count = c->count%1024 + 8;
 	}
 
 /* GOST encryption in CFB mode */
@@ -511,12 +521,13 @@ static void mac_block_mesh(struct ossl_gost_imit_ctx *c,const unsigned char *dat
 	 * interpret internal state of MAC algorithm as iv during keymeshing
 	 * (but does initialize internal state from iv in key transport
 	 */
-	if (c->key_meshing&& c->count && c->count %1024 ==0)
+	assert(c->count%8 == 0 && c->count <= 1024);
+	if (c->key_meshing && c->count==1024)
 		{
 		cryptopro_key_meshing(&(c->cctx),buffer);
 		}
 	mac_block(&(c->cctx),c->buffer,data);
-	c->count +=8;
+	c->count = c->count%1024 + 8;
 	}
 
 int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count)
@@ -565,6 +576,12 @@ int gost_imit_final(EVP_MD_CTX *ctx,unsigned char *md)
 		GOSTerr(GOST_F_GOST_IMIT_FINAL, GOST_R_MAC_KEY_NOT_SET);
 		return 0;
 	}
+	if (c->count==0 && c->bytes_left)
+		{
+		unsigned char buffer[8];
+		memset(buffer, 0, 8);
+		gost_imit_update(ctx, buffer, 8);
+		}
 	if (c->bytes_left)
 		{
 		int i;
diff --git a/engines/ccgost/gost_lcl.h b/engines/ccgost/gost_lcl.h
index 437a48cc86..00aa42cea4 100644
--- a/engines/ccgost/gost_lcl.h
+++ b/engines/ccgost/gost_lcl.h
@@ -136,7 +136,7 @@ extern EVP_MD imit_gost_cpa;
 /* Cipher context used for EVP_CIPHER operation */
 struct ossl_gost_cipher_ctx {
 	int paramNID;
-	off_t count;
+	unsigned int count;
 	int key_meshing;
 	gost_ctx cctx;
 };	
@@ -151,7 +151,7 @@ struct ossl_gost_imit_ctx {
 	gost_ctx cctx;
 	unsigned char buffer[8];
 	unsigned char partial_block[8];
-	off_t count;
+	unsigned int count;
 	int key_meshing;
 	int bytes_left;
 	int key_set;
-- 
2.34.1