1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/* $OpenBSD: digest-openssl.c,v 1.4 2014/07/03 03:26:43 djm Exp $ */
/*
* Copyright (c) 2013 Damien Miller <djm@mindrot.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "includes.h"
#include <sys/types.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/evp.h>
#include "openbsd-compat/openssl-compat.h"
#include "sshbuf.h"
#include "digest.h"
#include "ssherr.h"
#ifndef HAVE_EVP_RIPEMD160
# define EVP_ripemd160 NULL
#endif /* HAVE_EVP_RIPEMD160 */
#ifndef HAVE_EVP_SHA256
# define EVP_sha256 NULL
# define EVP_sha384 NULL
# define EVP_sha512 NULL
#endif /* HAVE_EVP_SHA256 */
struct ssh_digest_ctx {
int alg;
EVP_MD_CTX mdctx;
};
struct ssh_digest {
int id;
const char *name;
size_t digest_len;
const EVP_MD *(*mdfunc)(void);
};
/* NB. Indexed directly by algorithm number */
const struct ssh_digest digests[] = {
{ SSH_DIGEST_MD5, "MD5", 16, EVP_md5 },
{ SSH_DIGEST_RIPEMD160, "RIPEMD160", 20, EVP_ripemd160 },
{ SSH_DIGEST_SHA1, "SHA1", 20, EVP_sha1 },
{ SSH_DIGEST_SHA256, "SHA256", 32, EVP_sha256 },
{ SSH_DIGEST_SHA384, "SHA384", 48, EVP_sha384 },
{ SSH_DIGEST_SHA512, "SHA512", 64, EVP_sha512 },
{ -1, NULL, 0, NULL },
};
static const struct ssh_digest *
ssh_digest_by_alg(int alg)
{
if (alg < 0 || alg >= SSH_DIGEST_MAX)
return NULL;
if (digests[alg].id != alg) /* sanity */
return NULL;
if (digests[alg].mdfunc == NULL)
return NULL;
return &(digests[alg]);
}
size_t
ssh_digest_bytes(int alg)
{
const struct ssh_digest *digest = ssh_digest_by_alg(alg);
return digest == NULL ? 0 : digest->digest_len;
}
size_t
ssh_digest_blocksize(struct ssh_digest_ctx *ctx)
{
return EVP_MD_CTX_block_size(&ctx->mdctx);
}
struct ssh_digest_ctx *
ssh_digest_start(int alg)
{
const struct ssh_digest *digest = ssh_digest_by_alg(alg);
struct ssh_digest_ctx *ret;
if (digest == NULL || ((ret = calloc(1, sizeof(*ret))) == NULL))
return NULL;
ret->alg = alg;
EVP_MD_CTX_init(&ret->mdctx);
if (EVP_DigestInit_ex(&ret->mdctx, digest->mdfunc(), NULL) != 1) {
free(ret);
return NULL;
}
return ret;
}
int
ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to)
{
if (from->alg != to->alg)
return SSH_ERR_INVALID_ARGUMENT;
/* we have bcopy-style order while openssl has memcpy-style */
if (!EVP_MD_CTX_copy_ex(&to->mdctx, &from->mdctx))
return SSH_ERR_LIBCRYPTO_ERROR;
return 0;
}
int
ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
{
if (EVP_DigestUpdate(&ctx->mdctx, m, mlen) != 1)
return SSH_ERR_LIBCRYPTO_ERROR;
return 0;
}
int
ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const struct sshbuf *b)
{
return ssh_digest_update(ctx, sshbuf_ptr(b), sshbuf_len(b));
}
int
ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
{
const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
u_int l = dlen;
if (dlen > UINT_MAX)
return SSH_ERR_INVALID_ARGUMENT;
if (dlen < digest->digest_len) /* No truncation allowed */
return SSH_ERR_INVALID_ARGUMENT;
if (EVP_DigestFinal_ex(&ctx->mdctx, d, &l) != 1)
return SSH_ERR_LIBCRYPTO_ERROR;
if (l != digest->digest_len) /* sanity */
return SSH_ERR_INTERNAL_ERROR;
return 0;
}
void
ssh_digest_free(struct ssh_digest_ctx *ctx)
{
if (ctx != NULL) {
EVP_MD_CTX_cleanup(&ctx->mdctx);
explicit_bzero(ctx, sizeof(*ctx));
free(ctx);
}
}
int
ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
{
const struct ssh_digest *digest = ssh_digest_by_alg(alg);
u_int mdlen;
if (digest == NULL)
return SSH_ERR_INVALID_ARGUMENT;
if (dlen > UINT_MAX)
return SSH_ERR_INVALID_ARGUMENT;
if (dlen < digest->digest_len)
return SSH_ERR_INVALID_ARGUMENT;
mdlen = dlen;
if (!EVP_Digest(m, mlen, d, &mdlen, digest->mdfunc(), NULL))
return SSH_ERR_LIBCRYPTO_ERROR;
return 0;
}
int
ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen)
{
return ssh_digest_memory(alg, sshbuf_ptr(b), sshbuf_len(b), d, dlen);
}
|
