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.
22 #include <sys/types.h>
35 typedef void md_init_fn(void *mdctx);
36 typedef void md_update_fn(void *mdctx, const u_int8_t *m, size_t mlen);
37 typedef void md_final_fn(u_int8_t[], void *mdctx);
39 struct ssh_digest_ctx {
51 md_update_fn *md_update;
52 md_final_fn *md_final;
55 /* NB. Indexed directly by algorithm number */
56 const struct ssh_digest digests[SSH_DIGEST_MAX] = {
63 (md_init_fn *) MD5Init,
64 (md_update_fn *) MD5Update,
65 (md_final_fn *) MD5Final
73 (md_init_fn *) RMD160Init,
74 (md_update_fn *) RMD160Update,
75 (md_final_fn *) RMD160Final
83 (md_init_fn *) SHA1Init,
84 (md_update_fn *) SHA1Update,
85 (md_final_fn *) SHA1Final
93 (md_init_fn *) SHA256Init,
94 (md_update_fn *) SHA256Update,
95 (md_final_fn *) SHA256Final
101 SHA384_DIGEST_LENGTH,
103 (md_init_fn *) SHA384Init,
104 (md_update_fn *) SHA384Update,
105 (md_final_fn *) SHA384Final
111 SHA512_DIGEST_LENGTH,
113 (md_init_fn *) SHA512Init,
114 (md_update_fn *) SHA512Update,
115 (md_final_fn *) SHA512Final
119 static const struct ssh_digest *
120 ssh_digest_by_alg(int alg)
122 if (alg < 0 || alg >= SSH_DIGEST_MAX)
124 if (digests[alg].id != alg) /* sanity */
126 return &(digests[alg]);
130 ssh_digest_bytes(int alg)
132 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
134 return digest == NULL ? 0 : digest->digest_len;
138 ssh_digest_blocksize(struct ssh_digest_ctx *ctx)
140 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
142 return digest == NULL ? 0 : digest->block_len;
145 struct ssh_digest_ctx *
146 ssh_digest_start(int alg)
148 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
149 struct ssh_digest_ctx *ret;
151 if (digest == NULL || (ret = calloc(1, sizeof(*ret))) == NULL)
153 if ((ret->mdctx = calloc(1, digest->ctx_len)) == NULL) {
158 digest->md_init(ret->mdctx);
163 ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to)
165 const struct ssh_digest *digest = ssh_digest_by_alg(from->alg);
167 if (digest == NULL || from->alg != to->alg)
169 memcpy(to->mdctx, from->mdctx, digest->ctx_len);
174 ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
176 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
180 digest->md_update(ctx->mdctx, m, mlen);
185 ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const Buffer *b)
187 return ssh_digest_update(ctx, buffer_ptr(b), buffer_len(b));
191 ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
193 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
199 if (dlen < digest->digest_len) /* No truncation allowed */
201 digest->md_final(d, ctx->mdctx);
206 ssh_digest_free(struct ssh_digest_ctx *ctx)
208 const struct ssh_digest *digest;
211 digest = ssh_digest_by_alg(ctx->alg);
213 explicit_bzero(ctx->mdctx, digest->ctx_len);
215 explicit_bzero(ctx, sizeof(*ctx));
222 ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
224 struct ssh_digest_ctx *ctx = ssh_digest_start(alg);
228 if (ssh_digest_update(ctx, m, mlen) != 0 ||
229 ssh_digest_final(ctx, d, dlen) != 0)
231 ssh_digest_free(ctx);
236 ssh_digest_buffer(int alg, const Buffer *b, u_char *d, size_t dlen)
238 return ssh_digest_memory(alg, buffer_ptr(b), buffer_len(b), d, dlen);