Annotation of src/usr.bin/ssh/digest-openssl.c, Revision 1.6
1.6 ! dtucker 1: /* $OpenBSD: digest-openssl.c,v 1.5 2014/12/21 22:27:56 djm Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2013 Damien Miller <djm@mindrot.org>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: */
17:
18: #include <sys/types.h>
19: #include <limits.h>
20: #include <stdlib.h>
21: #include <string.h>
22:
23: #include <openssl/evp.h>
24:
1.3 djm 25: #include "sshbuf.h"
1.1 markus 26: #include "digest.h"
1.3 djm 27: #include "ssherr.h"
1.1 markus 28:
29: struct ssh_digest_ctx {
30: int alg;
31: EVP_MD_CTX mdctx;
32: };
33:
34: struct ssh_digest {
35: int id;
36: const char *name;
37: size_t digest_len;
38: const EVP_MD *(*mdfunc)(void);
39: };
40:
41: /* NB. Indexed directly by algorithm number */
42: const struct ssh_digest digests[] = {
43: { SSH_DIGEST_MD5, "MD5", 16, EVP_md5 },
44: { SSH_DIGEST_RIPEMD160, "RIPEMD160", 20, EVP_ripemd160 },
45: { SSH_DIGEST_SHA1, "SHA1", 20, EVP_sha1 },
46: { SSH_DIGEST_SHA256, "SHA256", 32, EVP_sha256 },
47: { SSH_DIGEST_SHA384, "SHA384", 48, EVP_sha384 },
48: { SSH_DIGEST_SHA512, "SHA512", 64, EVP_sha512 },
49: { -1, NULL, 0, NULL },
50: };
51:
52: static const struct ssh_digest *
53: ssh_digest_by_alg(int alg)
54: {
55: if (alg < 0 || alg >= SSH_DIGEST_MAX)
56: return NULL;
57: if (digests[alg].id != alg) /* sanity */
58: return NULL;
59: return &(digests[alg]);
1.5 djm 60: }
61:
62: int
63: ssh_digest_alg_by_name(const char *name)
64: {
65: int alg;
66:
67: for (alg = 0; digests[alg].id != -1; alg++) {
68: if (strcasecmp(name, digests[alg].name) == 0)
69: return digests[alg].id;
70: }
71: return -1;
72: }
73:
74: const char *
75: ssh_digest_alg_name(int alg)
76: {
77: const struct ssh_digest *digest = ssh_digest_by_alg(alg);
78:
79: return digest == NULL ? NULL : digest->name;
1.1 markus 80: }
81:
82: size_t
83: ssh_digest_bytes(int alg)
84: {
85: const struct ssh_digest *digest = ssh_digest_by_alg(alg);
86:
87: return digest == NULL ? 0 : digest->digest_len;
88: }
89:
90: size_t
91: ssh_digest_blocksize(struct ssh_digest_ctx *ctx)
92: {
93: return EVP_MD_CTX_block_size(&ctx->mdctx);
94: }
95:
96: struct ssh_digest_ctx *
97: ssh_digest_start(int alg)
98: {
99: const struct ssh_digest *digest = ssh_digest_by_alg(alg);
100: struct ssh_digest_ctx *ret;
101:
102: if (digest == NULL || ((ret = calloc(1, sizeof(*ret))) == NULL))
103: return NULL;
104: ret->alg = alg;
105: EVP_MD_CTX_init(&ret->mdctx);
106: if (EVP_DigestInit_ex(&ret->mdctx, digest->mdfunc(), NULL) != 1) {
107: free(ret);
108: return NULL;
109: }
110: return ret;
111: }
112:
113: int
114: ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to)
115: {
1.3 djm 116: if (from->alg != to->alg)
117: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 118: /* we have bcopy-style order while openssl has memcpy-style */
119: if (!EVP_MD_CTX_copy_ex(&to->mdctx, &from->mdctx))
1.3 djm 120: return SSH_ERR_LIBCRYPTO_ERROR;
1.1 markus 121: return 0;
122: }
123:
124: int
125: ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
126: {
127: if (EVP_DigestUpdate(&ctx->mdctx, m, mlen) != 1)
1.3 djm 128: return SSH_ERR_LIBCRYPTO_ERROR;
1.1 markus 129: return 0;
130: }
131:
132: int
1.3 djm 133: ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const struct sshbuf *b)
1.1 markus 134: {
1.3 djm 135: return ssh_digest_update(ctx, sshbuf_ptr(b), sshbuf_len(b));
1.1 markus 136: }
137:
138: int
139: ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
140: {
141: const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
142: u_int l = dlen;
143:
1.6 ! dtucker 144: if (digest == NULL || dlen > UINT_MAX)
1.3 djm 145: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 146: if (dlen < digest->digest_len) /* No truncation allowed */
1.3 djm 147: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 148: if (EVP_DigestFinal_ex(&ctx->mdctx, d, &l) != 1)
1.3 djm 149: return SSH_ERR_LIBCRYPTO_ERROR;
1.1 markus 150: if (l != digest->digest_len) /* sanity */
1.3 djm 151: return SSH_ERR_INTERNAL_ERROR;
1.1 markus 152: return 0;
153: }
154:
155: void
156: ssh_digest_free(struct ssh_digest_ctx *ctx)
157: {
158: if (ctx != NULL) {
159: EVP_MD_CTX_cleanup(&ctx->mdctx);
1.2 djm 160: explicit_bzero(ctx, sizeof(*ctx));
1.1 markus 161: free(ctx);
162: }
163: }
164:
165: int
166: ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
167: {
1.4 djm 168: const struct ssh_digest *digest = ssh_digest_by_alg(alg);
169: u_int mdlen;
1.1 markus 170:
1.4 djm 171: if (digest == NULL)
172: return SSH_ERR_INVALID_ARGUMENT;
173: if (dlen > UINT_MAX)
1.3 djm 174: return SSH_ERR_INVALID_ARGUMENT;
1.4 djm 175: if (dlen < digest->digest_len)
176: return SSH_ERR_INVALID_ARGUMENT;
177: mdlen = dlen;
178: if (!EVP_Digest(m, mlen, d, &mdlen, digest->mdfunc(), NULL))
179: return SSH_ERR_LIBCRYPTO_ERROR;
1.1 markus 180: return 0;
181: }
182:
183: int
1.3 djm 184: ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen)
1.1 markus 185: {
1.3 djm 186: return ssh_digest_memory(alg, sshbuf_ptr(b), sshbuf_len(b), d, dlen);
1.1 markus 187: }
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