1 /* $OpenBSD: digest-libc.c,v 1.6 2017/05/08 22:57:38 djm Exp $ */
3 * Copyright (c) 2013 Damien Miller <djm@mindrot.org>
4 * Copyright (c) 2014 Markus Friedl. All rights reserved.
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23 #include <sys/types.h>
39 typedef void md_init_fn(void *mdctx);
40 typedef void md_update_fn(void *mdctx, const u_int8_t *m, size_t mlen);
41 typedef void md_final_fn(u_int8_t[], void *mdctx);
43 struct ssh_digest_ctx {
55 md_update_fn *md_update;
56 md_final_fn *md_final;
59 /* NB. Indexed directly by algorithm number */
60 const struct ssh_digest digests[SSH_DIGEST_MAX] = {
67 (md_init_fn *) MD5Init,
68 (md_update_fn *) MD5Update,
69 (md_final_fn *) MD5Final
77 (md_init_fn *) SHA1Init,
78 (md_update_fn *) SHA1Update,
79 (md_final_fn *) SHA1Final
87 (md_init_fn *) SHA256_Init,
88 (md_update_fn *) SHA256_Update,
89 (md_final_fn *) SHA256_Final
97 (md_init_fn *) SHA384_Init,
98 (md_update_fn *) SHA384_Update,
99 (md_final_fn *) SHA384_Final
105 SHA512_DIGEST_LENGTH,
107 (md_init_fn *) SHA512_Init,
108 (md_update_fn *) SHA512_Update,
109 (md_final_fn *) SHA512_Final
113 static const struct ssh_digest *
114 ssh_digest_by_alg(int alg)
116 if (alg < 0 || alg >= SSH_DIGEST_MAX)
118 if (digests[alg].id != alg) /* sanity */
120 return &(digests[alg]);
124 ssh_digest_alg_by_name(const char *name)
128 for (alg = 0; alg < SSH_DIGEST_MAX; alg++) {
129 if (strcasecmp(name, digests[alg].name) == 0)
130 return digests[alg].id;
136 ssh_digest_alg_name(int alg)
138 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
140 return digest == NULL ? NULL : digest->name;
144 ssh_digest_bytes(int alg)
146 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
148 return digest == NULL ? 0 : digest->digest_len;
152 ssh_digest_blocksize(struct ssh_digest_ctx *ctx)
154 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
156 return digest == NULL ? 0 : digest->block_len;
159 struct ssh_digest_ctx *
160 ssh_digest_start(int alg)
162 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
163 struct ssh_digest_ctx *ret;
165 if (digest == NULL || (ret = calloc(1, sizeof(*ret))) == NULL)
167 if ((ret->mdctx = calloc(1, digest->ctx_len)) == NULL) {
172 digest->md_init(ret->mdctx);
177 ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to)
179 const struct ssh_digest *digest = ssh_digest_by_alg(from->alg);
181 if (digest == NULL || from->alg != to->alg)
182 return SSH_ERR_INVALID_ARGUMENT;
183 memcpy(to->mdctx, from->mdctx, digest->ctx_len);
188 ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
190 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
193 return SSH_ERR_INVALID_ARGUMENT;
194 digest->md_update(ctx->mdctx, m, mlen);
199 ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const struct sshbuf *b)
201 return ssh_digest_update(ctx, sshbuf_ptr(b), sshbuf_len(b));
205 ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
207 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
210 return SSH_ERR_INVALID_ARGUMENT;
212 return SSH_ERR_INVALID_ARGUMENT;
213 if (dlen < digest->digest_len) /* No truncation allowed */
214 return SSH_ERR_INVALID_ARGUMENT;
215 digest->md_final(d, ctx->mdctx);
220 ssh_digest_free(struct ssh_digest_ctx *ctx)
222 const struct ssh_digest *digest;
225 digest = ssh_digest_by_alg(ctx->alg);
227 explicit_bzero(ctx->mdctx, digest->ctx_len);
229 explicit_bzero(ctx, sizeof(*ctx));
236 ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
238 struct ssh_digest_ctx *ctx = ssh_digest_start(alg);
241 return SSH_ERR_INVALID_ARGUMENT;
242 if (ssh_digest_update(ctx, m, mlen) != 0 ||
243 ssh_digest_final(ctx, d, dlen) != 0)
244 return SSH_ERR_INVALID_ARGUMENT;
245 ssh_digest_free(ctx);
250 ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen)
252 return ssh_digest_memory(alg, sshbuf_ptr(b), sshbuf_len(b), d, dlen);
254 #endif /* !WITH_OPENSSL */