gost_md.c revision 280304 
1/**********************************************************************
2 *                          md_gost.c                                 *
3 *             Copyright (c) 2005-2006 Cryptocom LTD                  *
4 *         This file is distributed under the same license as OpenSSL *
5 *                                                                    *
6 *       OpenSSL interface to GOST R 34.11-94 hash functions          *
7 *          Requires OpenSSL 0.9.9 for compilation                    *
8 **********************************************************************/
9#include <string.h>
10#include "gost_lcl.h"
11#include "gosthash.h"
12#include "e_gost_err.h"
13
14/* implementation of GOST 34.11 hash function See gost_md.c*/
15static int gost_digest_init(EVP_MD_CTX *ctx);
16static int gost_digest_update(EVP_MD_CTX *ctx, const void *data,
17                              size_t count);
18static int gost_digest_final(EVP_MD_CTX *ctx, unsigned char *md);
19static int gost_digest_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from);
20static int gost_digest_cleanup(EVP_MD_CTX *ctx);
21
22EVP_MD digest_gost = {
23    NID_id_GostR3411_94,
24    NID_undef,
25    32,
26    EVP_MD_FLAG_PKEY_METHOD_SIGNATURE,
27    gost_digest_init,
28    gost_digest_update,
29    gost_digest_final,
30    gost_digest_copy,
31    gost_digest_cleanup,
32    NULL,
33    NULL,
34    {NID_undef, NID_undef, 0, 0, 0},
35    32,
36    sizeof(struct ossl_gost_digest_ctx),
37    NULL
38};
39
40int gost_digest_init(EVP_MD_CTX *ctx)
41{
42    struct ossl_gost_digest_ctx *c = ctx->md_data;
43    memset(&(c->dctx), 0, sizeof(gost_hash_ctx));
44    gost_init(&(c->cctx), &GostR3411_94_CryptoProParamSet);
45    c->dctx.cipher_ctx = &(c->cctx);
46    return 1;
47}
48
49int gost_digest_update(EVP_MD_CTX *ctx, const void *data, size_t count)
50{
51    return hash_block((gost_hash_ctx *) ctx->md_data, data, count);
52}
53
54int gost_digest_final(EVP_MD_CTX *ctx, unsigned char *md)
55{
56    return finish_hash((gost_hash_ctx *) ctx->md_data, md);
57
58}
59
60int gost_digest_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
61{
62    struct ossl_gost_digest_ctx *md_ctx = to->md_data;
63    if (to->md_data && from->md_data) {
64        memcpy(to->md_data, from->md_data,
65               sizeof(struct ossl_gost_digest_ctx));
66        md_ctx->dctx.cipher_ctx = &(md_ctx->cctx);
67    }
68    return 1;
69}
70
71int gost_digest_cleanup(EVP_MD_CTX *ctx)
72{
73    if (ctx->md_data)
74        memset(ctx->md_data, 0, sizeof(struct ossl_gost_digest_ctx));
75    return 1;
76}
77