djm@openbsd.org | 56d1c83 | 2014-12-21 22:27:55 +0000 | [diff] [blame] | 1 | /* $OpenBSD: digest-libc.c,v 1.4 2014/12/21 22:27:56 djm Exp $ */ |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2013 Damien Miller <djm@mindrot.org> |
| 4 | * Copyright (c) 2014 Markus Friedl. All rights reserved. |
| 5 | * |
| 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. |
| 9 | * |
| 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. |
| 17 | */ |
| 18 | |
| 19 | #include "includes.h" |
| 20 | |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 21 | #ifndef WITH_OPENSSL |
| 22 | |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 23 | #include <sys/types.h> |
| 24 | #include <limits.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <string.h> |
| 27 | |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 28 | #if 0 |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 29 | #include <md5.h> |
| 30 | #include <rmd160.h> |
| 31 | #include <sha1.h> |
| 32 | #include <sha2.h> |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 33 | #endif |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 34 | |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 35 | #include "ssherr.h" |
| 36 | #include "sshbuf.h" |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 37 | #include "digest.h" |
| 38 | |
| 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); |
| 42 | |
| 43 | struct ssh_digest_ctx { |
| 44 | int alg; |
| 45 | void *mdctx; |
| 46 | }; |
| 47 | |
| 48 | struct ssh_digest { |
| 49 | int id; |
| 50 | const char *name; |
| 51 | size_t block_len; |
| 52 | size_t digest_len; |
| 53 | size_t ctx_len; |
| 54 | md_init_fn *md_init; |
| 55 | md_update_fn *md_update; |
| 56 | md_final_fn *md_final; |
| 57 | }; |
| 58 | |
| 59 | /* NB. Indexed directly by algorithm number */ |
| 60 | const struct ssh_digest digests[SSH_DIGEST_MAX] = { |
| 61 | { |
| 62 | SSH_DIGEST_MD5, |
| 63 | "MD5", |
| 64 | MD5_BLOCK_LENGTH, |
| 65 | MD5_DIGEST_LENGTH, |
| 66 | sizeof(MD5_CTX), |
| 67 | (md_init_fn *) MD5Init, |
| 68 | (md_update_fn *) MD5Update, |
| 69 | (md_final_fn *) MD5Final |
| 70 | }, |
| 71 | { |
| 72 | SSH_DIGEST_RIPEMD160, |
| 73 | "RIPEMD160", |
| 74 | RMD160_BLOCK_LENGTH, |
| 75 | RMD160_DIGEST_LENGTH, |
| 76 | sizeof(RMD160_CTX), |
| 77 | (md_init_fn *) RMD160Init, |
| 78 | (md_update_fn *) RMD160Update, |
| 79 | (md_final_fn *) RMD160Final |
| 80 | }, |
| 81 | { |
| 82 | SSH_DIGEST_SHA1, |
| 83 | "SHA1", |
| 84 | SHA1_BLOCK_LENGTH, |
| 85 | SHA1_DIGEST_LENGTH, |
| 86 | sizeof(SHA1_CTX), |
| 87 | (md_init_fn *) SHA1Init, |
| 88 | (md_update_fn *) SHA1Update, |
| 89 | (md_final_fn *) SHA1Final |
| 90 | }, |
| 91 | { |
| 92 | SSH_DIGEST_SHA256, |
| 93 | "SHA256", |
| 94 | SHA256_BLOCK_LENGTH, |
| 95 | SHA256_DIGEST_LENGTH, |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 96 | sizeof(SHA256_CTX), |
| 97 | (md_init_fn *) SHA256_Init, |
| 98 | (md_update_fn *) SHA256_Update, |
| 99 | (md_final_fn *) SHA256_Final |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 100 | }, |
| 101 | { |
| 102 | SSH_DIGEST_SHA384, |
| 103 | "SHA384", |
| 104 | SHA384_BLOCK_LENGTH, |
| 105 | SHA384_DIGEST_LENGTH, |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 106 | sizeof(SHA384_CTX), |
| 107 | (md_init_fn *) SHA384_Init, |
| 108 | (md_update_fn *) SHA384_Update, |
| 109 | (md_final_fn *) SHA384_Final |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 110 | }, |
| 111 | { |
| 112 | SSH_DIGEST_SHA512, |
| 113 | "SHA512", |
| 114 | SHA512_BLOCK_LENGTH, |
| 115 | SHA512_DIGEST_LENGTH, |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 116 | sizeof(SHA512_CTX), |
| 117 | (md_init_fn *) SHA512_Init, |
| 118 | (md_update_fn *) SHA512_Update, |
| 119 | (md_final_fn *) SHA512_Final |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 120 | } |
| 121 | }; |
| 122 | |
| 123 | static const struct ssh_digest * |
| 124 | ssh_digest_by_alg(int alg) |
| 125 | { |
| 126 | if (alg < 0 || alg >= SSH_DIGEST_MAX) |
| 127 | return NULL; |
| 128 | if (digests[alg].id != alg) /* sanity */ |
| 129 | return NULL; |
| 130 | return &(digests[alg]); |
| 131 | } |
| 132 | |
djm@openbsd.org | 56d1c83 | 2014-12-21 22:27:55 +0000 | [diff] [blame] | 133 | int |
| 134 | ssh_digest_alg_by_name(const char *name) |
| 135 | { |
| 136 | int alg; |
| 137 | |
| 138 | for (alg = 0; alg < SSH_DIGEST_MAX; alg++) { |
| 139 | if (strcasecmp(name, digests[alg].name) == 0) |
| 140 | return digests[alg].id; |
| 141 | } |
| 142 | return -1; |
| 143 | } |
| 144 | |
| 145 | const char * |
| 146 | ssh_digest_alg_name(int alg) |
| 147 | { |
| 148 | const struct ssh_digest *digest = ssh_digest_by_alg(alg); |
| 149 | |
| 150 | return digest == NULL ? NULL : digest->name; |
| 151 | } |
| 152 | |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 153 | size_t |
| 154 | ssh_digest_bytes(int alg) |
| 155 | { |
| 156 | const struct ssh_digest *digest = ssh_digest_by_alg(alg); |
| 157 | |
| 158 | return digest == NULL ? 0 : digest->digest_len; |
| 159 | } |
| 160 | |
| 161 | size_t |
| 162 | ssh_digest_blocksize(struct ssh_digest_ctx *ctx) |
| 163 | { |
| 164 | const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg); |
| 165 | |
| 166 | return digest == NULL ? 0 : digest->block_len; |
| 167 | } |
| 168 | |
| 169 | struct ssh_digest_ctx * |
| 170 | ssh_digest_start(int alg) |
| 171 | { |
| 172 | const struct ssh_digest *digest = ssh_digest_by_alg(alg); |
| 173 | struct ssh_digest_ctx *ret; |
| 174 | |
| 175 | if (digest == NULL || (ret = calloc(1, sizeof(ret))) == NULL) |
| 176 | return NULL; |
| 177 | if ((ret->mdctx = calloc(1, digest->ctx_len)) == NULL) { |
| 178 | free(ret); |
| 179 | return NULL; |
| 180 | } |
| 181 | ret->alg = alg; |
| 182 | digest->md_init(ret->mdctx); |
| 183 | return ret; |
| 184 | } |
| 185 | |
| 186 | int |
| 187 | ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to) |
| 188 | { |
| 189 | const struct ssh_digest *digest = ssh_digest_by_alg(from->alg); |
| 190 | |
| 191 | if (digest == NULL || from->alg != to->alg) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 192 | return SSH_ERR_INVALID_ARGUMENT; |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 193 | memcpy(to->mdctx, from->mdctx, digest->ctx_len); |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | int |
| 198 | ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen) |
| 199 | { |
| 200 | const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg); |
| 201 | |
| 202 | if (digest == NULL) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 203 | return SSH_ERR_INVALID_ARGUMENT; |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 204 | digest->md_update(ctx->mdctx, m, mlen); |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 209 | ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const struct sshbuf *b) |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 210 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 211 | return ssh_digest_update(ctx, sshbuf_ptr(b), sshbuf_len(b)); |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | int |
| 215 | ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen) |
| 216 | { |
| 217 | const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg); |
| 218 | |
| 219 | if (digest == NULL) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 220 | return SSH_ERR_INVALID_ARGUMENT; |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 221 | if (dlen > UINT_MAX) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 222 | return SSH_ERR_INVALID_ARGUMENT; |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 223 | if (dlen < digest->digest_len) /* No truncation allowed */ |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 224 | return SSH_ERR_INVALID_ARGUMENT; |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 225 | digest->md_final(d, ctx->mdctx); |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | void |
| 230 | ssh_digest_free(struct ssh_digest_ctx *ctx) |
| 231 | { |
| 232 | const struct ssh_digest *digest; |
| 233 | |
| 234 | if (ctx != NULL) { |
| 235 | digest = ssh_digest_by_alg(ctx->alg); |
| 236 | if (digest) { |
Damien Miller | db3c595 | 2014-02-04 11:25:45 +1100 | [diff] [blame] | 237 | explicit_bzero(ctx->mdctx, digest->ctx_len); |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 238 | free(ctx->mdctx); |
Damien Miller | db3c595 | 2014-02-04 11:25:45 +1100 | [diff] [blame] | 239 | explicit_bzero(ctx, sizeof(*ctx)); |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 240 | free(ctx); |
| 241 | } |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | int |
| 246 | ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen) |
| 247 | { |
| 248 | struct ssh_digest_ctx *ctx = ssh_digest_start(alg); |
| 249 | |
| 250 | if (ctx == NULL) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 251 | return SSH_ERR_INVALID_ARGUMENT; |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 252 | if (ssh_digest_update(ctx, m, mlen) != 0 || |
| 253 | ssh_digest_final(ctx, d, dlen) != 0) |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 254 | return SSH_ERR_INVALID_ARGUMENT; |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 255 | ssh_digest_free(ctx); |
| 256 | return 0; |
| 257 | } |
| 258 | |
| 259 | int |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 260 | ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen) |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 261 | { |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 262 | return ssh_digest_memory(alg, sshbuf_ptr(b), sshbuf_len(b), d, dlen); |
Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 263 | } |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 264 | #endif /* !WITH_OPENSSL */ |