1 /* $OpenBSD: digest-libc.c,v 1.5 2015/05/05 02:48:17 jsg 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 *) RMD160Init,
78 (md_update_fn *) RMD160Update,
79 (md_final_fn *) RMD160Final
87 (md_init_fn *) SHA1Init,
88 (md_update_fn *) SHA1Update,
89 (md_final_fn *) SHA1Final
97 (md_init_fn *) SHA256_Init,
98 (md_update_fn *) SHA256_Update,
99 (md_final_fn *) SHA256_Final
105 SHA384_DIGEST_LENGTH,
107 (md_init_fn *) SHA384_Init,
108 (md_update_fn *) SHA384_Update,
109 (md_final_fn *) SHA384_Final
115 SHA512_DIGEST_LENGTH,
117 (md_init_fn *) SHA512_Init,
118 (md_update_fn *) SHA512_Update,
119 (md_final_fn *) SHA512_Final
123 static const struct ssh_digest *
124 ssh_digest_by_alg(int alg)
126 if (alg < 0 || alg >= SSH_DIGEST_MAX)
128 if (digests[alg].id != alg) /* sanity */
130 return &(digests[alg]);
134 ssh_digest_alg_by_name(const char *name)
138 for (alg = 0; alg < SSH_DIGEST_MAX; alg++) {
139 if (strcasecmp(name, digests[alg].name) == 0)
140 return digests[alg].id;
146 ssh_digest_alg_name(int alg)
148 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
150 return digest == NULL ? NULL : digest->name;
154 ssh_digest_bytes(int alg)
156 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
158 return digest == NULL ? 0 : digest->digest_len;
162 ssh_digest_blocksize(struct ssh_digest_ctx *ctx)
164 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
166 return digest == NULL ? 0 : digest->block_len;
169 struct ssh_digest_ctx *
170 ssh_digest_start(int alg)
172 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
173 struct ssh_digest_ctx *ret;
175 if (digest == NULL || (ret = calloc(1, sizeof(*ret))) == NULL)
177 if ((ret->mdctx = calloc(1, digest->ctx_len)) == NULL) {
182 digest->md_init(ret->mdctx);
187 ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to)
189 const struct ssh_digest *digest = ssh_digest_by_alg(from->alg);
191 if (digest == NULL || from->alg != to->alg)
192 return SSH_ERR_INVALID_ARGUMENT;
193 memcpy(to->mdctx, from->mdctx, digest->ctx_len);
198 ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
200 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
203 return SSH_ERR_INVALID_ARGUMENT;
204 digest->md_update(ctx->mdctx, m, mlen);
209 ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const struct sshbuf *b)
211 return ssh_digest_update(ctx, sshbuf_ptr(b), sshbuf_len(b));
215 ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
217 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
220 return SSH_ERR_INVALID_ARGUMENT;
222 return SSH_ERR_INVALID_ARGUMENT;
223 if (dlen < digest->digest_len) /* No truncation allowed */
224 return SSH_ERR_INVALID_ARGUMENT;
225 digest->md_final(d, ctx->mdctx);
230 ssh_digest_free(struct ssh_digest_ctx *ctx)
232 const struct ssh_digest *digest;
235 digest = ssh_digest_by_alg(ctx->alg);
237 explicit_bzero(ctx->mdctx, digest->ctx_len);
239 explicit_bzero(ctx, sizeof(*ctx));
246 ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
248 struct ssh_digest_ctx *ctx = ssh_digest_start(alg);
251 return SSH_ERR_INVALID_ARGUMENT;
252 if (ssh_digest_update(ctx, m, mlen) != 0 ||
253 ssh_digest_final(ctx, d, dlen) != 0)
254 return SSH_ERR_INVALID_ARGUMENT;
255 ssh_digest_free(ctx);
260 ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen)
262 return ssh_digest_memory(alg, sshbuf_ptr(b), sshbuf_len(b), d, dlen);
264 #endif /* !WITH_OPENSSL */