Damien Miller | ec93d15 | 2014-02-04 11:07:13 +1100 | [diff] [blame] | 1 | /* $OpenBSD: digest-libc.c,v 1.1 2014/01/28 20:13:46 markus Exp $ */ |
| 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 | |
| 21 | #include <sys/types.h> |
| 22 | #include <limits.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <string.h> |
| 25 | |
| 26 | #include <md5.h> |
| 27 | #include <rmd160.h> |
| 28 | #include <sha1.h> |
| 29 | #include <sha2.h> |
| 30 | |
| 31 | #include "buffer.h" |
| 32 | #include "digest.h" |
| 33 | |
| 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); |
| 37 | |
| 38 | struct ssh_digest_ctx { |
| 39 | int alg; |
| 40 | void *mdctx; |
| 41 | }; |
| 42 | |
| 43 | struct ssh_digest { |
| 44 | int id; |
| 45 | const char *name; |
| 46 | size_t block_len; |
| 47 | size_t digest_len; |
| 48 | size_t ctx_len; |
| 49 | md_init_fn *md_init; |
| 50 | md_update_fn *md_update; |
| 51 | md_final_fn *md_final; |
| 52 | }; |
| 53 | |
| 54 | /* NB. Indexed directly by algorithm number */ |
| 55 | const struct ssh_digest digests[SSH_DIGEST_MAX] = { |
| 56 | { |
| 57 | SSH_DIGEST_MD5, |
| 58 | "MD5", |
| 59 | MD5_BLOCK_LENGTH, |
| 60 | MD5_DIGEST_LENGTH, |
| 61 | sizeof(MD5_CTX), |
| 62 | (md_init_fn *) MD5Init, |
| 63 | (md_update_fn *) MD5Update, |
| 64 | (md_final_fn *) MD5Final |
| 65 | }, |
| 66 | { |
| 67 | SSH_DIGEST_RIPEMD160, |
| 68 | "RIPEMD160", |
| 69 | RMD160_BLOCK_LENGTH, |
| 70 | RMD160_DIGEST_LENGTH, |
| 71 | sizeof(RMD160_CTX), |
| 72 | (md_init_fn *) RMD160Init, |
| 73 | (md_update_fn *) RMD160Update, |
| 74 | (md_final_fn *) RMD160Final |
| 75 | }, |
| 76 | { |
| 77 | SSH_DIGEST_SHA1, |
| 78 | "SHA1", |
| 79 | SHA1_BLOCK_LENGTH, |
| 80 | SHA1_DIGEST_LENGTH, |
| 81 | sizeof(SHA1_CTX), |
| 82 | (md_init_fn *) SHA1Init, |
| 83 | (md_update_fn *) SHA1Update, |
| 84 | (md_final_fn *) SHA1Final |
| 85 | }, |
| 86 | { |
| 87 | SSH_DIGEST_SHA256, |
| 88 | "SHA256", |
| 89 | SHA256_BLOCK_LENGTH, |
| 90 | SHA256_DIGEST_LENGTH, |
| 91 | sizeof(SHA2_CTX), |
| 92 | (md_init_fn *) SHA256Init, |
| 93 | (md_update_fn *) SHA256Update, |
| 94 | (md_final_fn *) SHA256Final |
| 95 | }, |
| 96 | { |
| 97 | SSH_DIGEST_SHA384, |
| 98 | "SHA384", |
| 99 | SHA384_BLOCK_LENGTH, |
| 100 | SHA384_DIGEST_LENGTH, |
| 101 | sizeof(SHA2_CTX), |
| 102 | (md_init_fn *) SHA384Init, |
| 103 | (md_update_fn *) SHA384Update, |
| 104 | (md_final_fn *) SHA384Final |
| 105 | }, |
| 106 | { |
| 107 | SSH_DIGEST_SHA512, |
| 108 | "SHA512", |
| 109 | SHA512_BLOCK_LENGTH, |
| 110 | SHA512_DIGEST_LENGTH, |
| 111 | sizeof(SHA2_CTX), |
| 112 | (md_init_fn *) SHA512Init, |
| 113 | (md_update_fn *) SHA512Update, |
| 114 | (md_final_fn *) SHA512Final |
| 115 | } |
| 116 | }; |
| 117 | |
| 118 | static const struct ssh_digest * |
| 119 | ssh_digest_by_alg(int alg) |
| 120 | { |
| 121 | if (alg < 0 || alg >= SSH_DIGEST_MAX) |
| 122 | return NULL; |
| 123 | if (digests[alg].id != alg) /* sanity */ |
| 124 | return NULL; |
| 125 | return &(digests[alg]); |
| 126 | } |
| 127 | |
| 128 | size_t |
| 129 | ssh_digest_bytes(int alg) |
| 130 | { |
| 131 | const struct ssh_digest *digest = ssh_digest_by_alg(alg); |
| 132 | |
| 133 | return digest == NULL ? 0 : digest->digest_len; |
| 134 | } |
| 135 | |
| 136 | size_t |
| 137 | ssh_digest_blocksize(struct ssh_digest_ctx *ctx) |
| 138 | { |
| 139 | const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg); |
| 140 | |
| 141 | return digest == NULL ? 0 : digest->block_len; |
| 142 | } |
| 143 | |
| 144 | struct ssh_digest_ctx * |
| 145 | ssh_digest_start(int alg) |
| 146 | { |
| 147 | const struct ssh_digest *digest = ssh_digest_by_alg(alg); |
| 148 | struct ssh_digest_ctx *ret; |
| 149 | |
| 150 | if (digest == NULL || (ret = calloc(1, sizeof(ret))) == NULL) |
| 151 | return NULL; |
| 152 | if ((ret->mdctx = calloc(1, digest->ctx_len)) == NULL) { |
| 153 | free(ret); |
| 154 | return NULL; |
| 155 | } |
| 156 | ret->alg = alg; |
| 157 | digest->md_init(ret->mdctx); |
| 158 | return ret; |
| 159 | } |
| 160 | |
| 161 | int |
| 162 | ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to) |
| 163 | { |
| 164 | const struct ssh_digest *digest = ssh_digest_by_alg(from->alg); |
| 165 | |
| 166 | if (digest == NULL || from->alg != to->alg) |
| 167 | return -1; |
| 168 | memcpy(to->mdctx, from->mdctx, digest->ctx_len); |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | int |
| 173 | ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen) |
| 174 | { |
| 175 | const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg); |
| 176 | |
| 177 | if (digest == NULL) |
| 178 | return -1; |
| 179 | digest->md_update(ctx->mdctx, m, mlen); |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | int |
| 184 | ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const Buffer *b) |
| 185 | { |
| 186 | return ssh_digest_update(ctx, buffer_ptr(b), buffer_len(b)); |
| 187 | } |
| 188 | |
| 189 | int |
| 190 | ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen) |
| 191 | { |
| 192 | const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg); |
| 193 | |
| 194 | if (digest == NULL) |
| 195 | return -1; |
| 196 | if (dlen > UINT_MAX) |
| 197 | return -1; |
| 198 | if (dlen < digest->digest_len) /* No truncation allowed */ |
| 199 | return -1; |
| 200 | digest->md_final(d, ctx->mdctx); |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | void |
| 205 | ssh_digest_free(struct ssh_digest_ctx *ctx) |
| 206 | { |
| 207 | const struct ssh_digest *digest; |
| 208 | |
| 209 | if (ctx != NULL) { |
| 210 | digest = ssh_digest_by_alg(ctx->alg); |
| 211 | if (digest) { |
| 212 | memset(ctx->mdctx, 0, digest->ctx_len); |
| 213 | free(ctx->mdctx); |
| 214 | memset(ctx, 0, sizeof(*ctx)); |
| 215 | free(ctx); |
| 216 | } |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | int |
| 221 | ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen) |
| 222 | { |
| 223 | struct ssh_digest_ctx *ctx = ssh_digest_start(alg); |
| 224 | |
| 225 | if (ctx == NULL) |
| 226 | return -1; |
| 227 | if (ssh_digest_update(ctx, m, mlen) != 0 || |
| 228 | ssh_digest_final(ctx, d, dlen) != 0) |
| 229 | return -1; |
| 230 | ssh_digest_free(ctx); |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | int |
| 235 | ssh_digest_buffer(int alg, const Buffer *b, u_char *d, size_t dlen) |
| 236 | { |
| 237 | return ssh_digest_memory(alg, buffer_ptr(b), buffer_len(b), d, dlen); |
| 238 | } |