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>
39 #if !defined(SHA256_BLOCK_LENGTH) && defined(SHA256_HMAC_BLOCK_SIZE)
40 #define SHA256_BLOCK_LENGTH SHA256_HMAC_BLOCK_SIZE
42 #if !defined(SHA384_BLOCK_LENGTH) && defined(SHA512_HMAC_BLOCK_SIZE)
43 #define SHA384_BLOCK_LENGTH SHA512_HMAC_BLOCK_SIZE
45 #if !defined(SHA512_BLOCK_LENGTH) && defined(SHA512_HMAC_BLOCK_SIZE)
46 #define SHA512_BLOCK_LENGTH SHA512_HMAC_BLOCK_SIZE
53 typedef void md_init_fn(void *mdctx);
54 typedef void md_update_fn(void *mdctx, const u_int8_t *m, size_t mlen);
55 typedef void md_final_fn(u_int8_t[], void *mdctx);
57 struct ssh_digest_ctx {
69 md_update_fn *md_update;
70 md_final_fn *md_final;
73 /* NB. Indexed directly by algorithm number */
74 const struct ssh_digest digests[SSH_DIGEST_MAX] = {
81 (md_init_fn *) MD5Init,
82 (md_update_fn *) MD5Update,
83 (md_final_fn *) MD5Final
91 (md_init_fn *) SHA1Init,
92 (md_update_fn *) SHA1Update,
93 (md_final_fn *) SHA1Final
101 (md_init_fn *) SHA256Init,
102 (md_update_fn *) SHA256Update,
103 (md_final_fn *) SHA256Final
109 SHA384_DIGEST_LENGTH,
111 (md_init_fn *) SHA384Init,
112 (md_update_fn *) SHA384Update,
113 (md_final_fn *) SHA384Final
119 SHA512_DIGEST_LENGTH,
121 (md_init_fn *) SHA512Init,
122 (md_update_fn *) SHA512Update,
123 (md_final_fn *) SHA512Final
127 static const struct ssh_digest *
128 ssh_digest_by_alg(int alg)
130 if (alg < 0 || alg >= SSH_DIGEST_MAX)
132 if (digests[alg].id != alg) /* sanity */
134 return &(digests[alg]);
138 ssh_digest_alg_by_name(const char *name)
142 for (alg = 0; alg < SSH_DIGEST_MAX; alg++) {
143 if (strcasecmp(name, digests[alg].name) == 0)
144 return digests[alg].id;
150 ssh_digest_alg_name(int alg)
152 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
154 return digest == NULL ? NULL : digest->name;
158 ssh_digest_bytes(int alg)
160 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
162 return digest == NULL ? 0 : digest->digest_len;
166 ssh_digest_blocksize(struct ssh_digest_ctx *ctx)
168 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
170 return digest == NULL ? 0 : digest->block_len;
173 struct ssh_digest_ctx *
174 ssh_digest_start(int alg)
176 const struct ssh_digest *digest = ssh_digest_by_alg(alg);
177 struct ssh_digest_ctx *ret;
179 if (digest == NULL || (ret = calloc(1, sizeof(*ret))) == NULL)
181 if ((ret->mdctx = calloc(1, digest->ctx_len)) == NULL) {
186 digest->md_init(ret->mdctx);
191 ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to)
193 const struct ssh_digest *digest = ssh_digest_by_alg(from->alg);
195 if (digest == NULL || from->alg != to->alg)
196 return SSH_ERR_INVALID_ARGUMENT;
197 memcpy(to->mdctx, from->mdctx, digest->ctx_len);
202 ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
204 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
207 return SSH_ERR_INVALID_ARGUMENT;
208 digest->md_update(ctx->mdctx, m, mlen);
213 ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const struct sshbuf *b)
215 return ssh_digest_update(ctx, sshbuf_ptr(b), sshbuf_len(b));
219 ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
221 const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
224 return SSH_ERR_INVALID_ARGUMENT;
226 return SSH_ERR_INVALID_ARGUMENT;
227 if (dlen < digest->digest_len) /* No truncation allowed */
228 return SSH_ERR_INVALID_ARGUMENT;
229 digest->md_final(d, ctx->mdctx);
234 ssh_digest_free(struct ssh_digest_ctx *ctx)
236 const struct ssh_digest *digest;
239 digest = ssh_digest_by_alg(ctx->alg);
241 explicit_bzero(ctx->mdctx, digest->ctx_len);
243 freezero(ctx, sizeof(*ctx));
249 ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
251 struct ssh_digest_ctx *ctx = ssh_digest_start(alg);
254 return SSH_ERR_INVALID_ARGUMENT;
255 if (ssh_digest_update(ctx, m, mlen) != 0 ||
256 ssh_digest_final(ctx, d, dlen) != 0)
257 return SSH_ERR_INVALID_ARGUMENT;
258 ssh_digest_free(ctx);
263 ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen)
265 return ssh_digest_memory(alg, sshbuf_ptr(b), sshbuf_len(b), d, dlen);
267 #endif /* !WITH_OPENSSL */