1 /* $OpenBSD: digest-libc.c,v 1.2 2014/02/02 03:44:31 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.
21 #include <sys/types.h>
34 typedef void md_init_fn(void *mdctx);
35 typedef void md_update_fn(void *mdctx, const u_int8_t *m, size_t mlen);
36 typedef void md_final_fn(u_int8_t[], void *mdctx);
38 struct ssh_digest_ctx {
50 md_update_fn *md_update;
51 md_final_fn *md_final;
54 /* NB. Indexed directly by algorithm number */
55 const struct ssh_digest digests[SSH_DIGEST_MAX] = {
62 (md_init_fn *) MD5Init,
63 (md_update_fn *) MD5Update,
64 (md_final_fn *) MD5Final
72 (md_init_fn *) RMD160Init,
73 (md_update_fn *) RMD160Update,
74 (md_final_fn *) RMD160Final
82 (md_init_fn *) SHA1Init,
83 (md_update_fn *) SHA1Update,
84 (md_final_fn *) SHA1Final
92 (md_init_fn *) SHA256Init,
93 (md_update_fn *) SHA256Update,
94 (md_final_fn *) SHA256Final
100 SHA384_DIGEST_LENGTH,
102 (md_init_fn *) SHA384Init,
103 (md_update_fn *) SHA384Update,
104 (md_final_fn *) SHA384Final
110 SHA512_DIGEST_LENGTH,
112 (md_init_fn *) SHA512Init,
113 (md_update_fn *) SHA512Update,
114 (md_final_fn *) SHA512Final
118 static const struct ssh_digest *
119 ssh_digest_by_alg(int alg)
121 if (alg < 0 || alg >= SSH_DIGEST_MAX)
123 if (digests[alg].id != alg) /* sanity */
125 return &(digests[alg]);
129 ssh_digest_bytes(int alg)
131 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
133 return digest == NULL ? 0 : digest->digest_len;
137 ssh_digest_blocksize(struct ssh_digest_ctx *ctx)
139 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
141 return digest == NULL ? 0 : digest->block_len;
144 struct ssh_digest_ctx *
145 ssh_digest_start(int alg)
147 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
148 struct ssh_digest_ctx *ret;
150 if (digest == NULL || (ret = calloc(1, sizeof(ret))) == NULL)
152 if ((ret->mdctx = calloc(1, digest->ctx_len)) == NULL) {
157 digest->md_init(ret->mdctx);
162 ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to)
164 const struct ssh_digest *digest = ssh_digest_by_alg(from->alg);
166 if (digest == NULL || from->alg != to->alg)
168 memcpy(to->mdctx, from->mdctx, digest->ctx_len);
173 ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
175 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
179 digest->md_update(ctx->mdctx, m, mlen);
184 ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const Buffer *b)
186 return ssh_digest_update(ctx, buffer_ptr(b), buffer_len(b));
190 ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
192 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
198 if (dlen < digest->digest_len) /* No truncation allowed */
200 digest->md_final(d, ctx->mdctx);
205 ssh_digest_free(struct ssh_digest_ctx *ctx)
207 const struct ssh_digest *digest;
210 digest = ssh_digest_by_alg(ctx->alg);
212 explicit_bzero(ctx->mdctx, digest->ctx_len);
214 explicit_bzero(ctx, sizeof(*ctx));
221 ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
223 struct ssh_digest_ctx *ctx = ssh_digest_start(alg);
227 if (ssh_digest_update(ctx, m, mlen) != 0 ||
228 ssh_digest_final(ctx, d, dlen) != 0)
230 ssh_digest_free(ctx);
235 ssh_digest_buffer(int alg, const Buffer *b, u_char *d, size_t dlen)
237 return ssh_digest_memory(alg, buffer_ptr(b), buffer_len(b), d, dlen);