1 /* $OpenBSD: digest-libc.c,v 1.7 2020/02/26 13:40:09 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>
43 typedef void md_init_fn(void *mdctx);
44 typedef void md_update_fn(void *mdctx, const u_int8_t *m, size_t mlen);
45 typedef void md_final_fn(u_int8_t[], void *mdctx);
47 struct ssh_digest_ctx {
59 md_update_fn *md_update;
60 md_final_fn *md_final;
63 /* NB. Indexed directly by algorithm number */
64 const struct ssh_digest digests[SSH_DIGEST_MAX] = {
71 (md_init_fn *) MD5Init,
72 (md_update_fn *) MD5Update,
73 (md_final_fn *) MD5Final
81 (md_init_fn *) SHA1Init,
82 (md_update_fn *) SHA1Update,
83 (md_final_fn *) SHA1Final
91 (md_init_fn *) SHA256Init,
92 (md_update_fn *) SHA256Update,
93 (md_final_fn *) SHA256Final
101 (md_init_fn *) SHA384Init,
102 (md_update_fn *) SHA384Update,
103 (md_final_fn *) SHA384Final
109 SHA512_DIGEST_LENGTH,
111 (md_init_fn *) SHA512Init,
112 (md_update_fn *) SHA512Update,
113 (md_final_fn *) SHA512Final
117 static const struct ssh_digest *
118 ssh_digest_by_alg(int alg)
120 if (alg < 0 || alg >= SSH_DIGEST_MAX)
122 if (digests[alg].id != alg) /* sanity */
124 return &(digests[alg]);
128 ssh_digest_alg_by_name(const char *name)
132 for (alg = 0; alg < SSH_DIGEST_MAX; alg++) {
133 if (strcasecmp(name, digests[alg].name) == 0)
134 return digests[alg].id;
140 ssh_digest_alg_name(int alg)
142 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
144 return digest == NULL ? NULL : digest->name;
148 ssh_digest_bytes(int alg)
150 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
152 return digest == NULL ? 0 : digest->digest_len;
156 ssh_digest_blocksize(struct ssh_digest_ctx *ctx)
158 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
160 return digest == NULL ? 0 : digest->block_len;
163 struct ssh_digest_ctx *
164 ssh_digest_start(int alg)
166 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
167 struct ssh_digest_ctx *ret;
169 if (digest == NULL || (ret = calloc(1, sizeof(*ret))) == NULL)
171 if ((ret->mdctx = calloc(1, digest->ctx_len)) == NULL) {
176 digest->md_init(ret->mdctx);
181 ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to)
183 const struct ssh_digest *digest = ssh_digest_by_alg(from->alg);
185 if (digest == NULL || from->alg != to->alg)
186 return SSH_ERR_INVALID_ARGUMENT;
187 memcpy(to->mdctx, from->mdctx, digest->ctx_len);
192 ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
194 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
197 return SSH_ERR_INVALID_ARGUMENT;
198 digest->md_update(ctx->mdctx, m, mlen);
203 ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const struct sshbuf *b)
205 return ssh_digest_update(ctx, sshbuf_ptr(b), sshbuf_len(b));
209 ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
211 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
214 return SSH_ERR_INVALID_ARGUMENT;
216 return SSH_ERR_INVALID_ARGUMENT;
217 if (dlen < digest->digest_len) /* No truncation allowed */
218 return SSH_ERR_INVALID_ARGUMENT;
219 digest->md_final(d, ctx->mdctx);
224 ssh_digest_free(struct ssh_digest_ctx *ctx)
226 const struct ssh_digest *digest;
229 digest = ssh_digest_by_alg(ctx->alg);
231 explicit_bzero(ctx->mdctx, digest->ctx_len);
233 freezero(ctx, sizeof(*ctx));
239 ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
241 struct ssh_digest_ctx *ctx = ssh_digest_start(alg);
244 return SSH_ERR_INVALID_ARGUMENT;
245 if (ssh_digest_update(ctx, m, mlen) != 0 ||
246 ssh_digest_final(ctx, d, dlen) != 0)
247 return SSH_ERR_INVALID_ARGUMENT;
248 ssh_digest_free(ctx);
253 ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen)
255 return ssh_digest_memory(alg, sshbuf_ptr(b), sshbuf_len(b), d, dlen);
257 #endif /* !WITH_OPENSSL */