Annotation of src/usr.bin/ssh/digest-libc.c, Revision 1.7
1.7 ! jsg 1: /* $OpenBSD: digest-libc.c,v 1.6 2017/05/08 22:57:38 djm Exp $ */
1.1 markus 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 <sys/types.h>
20: #include <limits.h>
21: #include <stdlib.h>
22: #include <string.h>
23:
24: #include <md5.h>
25: #include <rmd160.h>
26: #include <sha1.h>
27: #include <sha2.h>
28:
1.3 djm 29: #include "ssherr.h"
30: #include "sshbuf.h"
1.1 markus 31: #include "digest.h"
32:
33: typedef void md_init_fn(void *mdctx);
34: typedef void md_update_fn(void *mdctx, const u_int8_t *m, size_t mlen);
35: typedef void md_final_fn(u_int8_t[], void *mdctx);
36:
37: struct ssh_digest_ctx {
38: int alg;
39: void *mdctx;
40: };
41:
42: struct ssh_digest {
43: int id;
44: const char *name;
45: size_t block_len;
46: size_t digest_len;
47: size_t ctx_len;
48: md_init_fn *md_init;
49: md_update_fn *md_update;
50: md_final_fn *md_final;
51: };
52:
53: /* NB. Indexed directly by algorithm number */
54: const struct ssh_digest digests[SSH_DIGEST_MAX] = {
55: {
56: SSH_DIGEST_MD5,
57: "MD5",
58: MD5_BLOCK_LENGTH,
59: MD5_DIGEST_LENGTH,
60: sizeof(MD5_CTX),
61: (md_init_fn *) MD5Init,
62: (md_update_fn *) MD5Update,
63: (md_final_fn *) MD5Final
64: },
65: {
66: SSH_DIGEST_SHA1,
67: "SHA1",
68: SHA1_BLOCK_LENGTH,
69: SHA1_DIGEST_LENGTH,
70: sizeof(SHA1_CTX),
71: (md_init_fn *) SHA1Init,
72: (md_update_fn *) SHA1Update,
73: (md_final_fn *) SHA1Final
74: },
75: {
76: SSH_DIGEST_SHA256,
77: "SHA256",
78: SHA256_BLOCK_LENGTH,
79: SHA256_DIGEST_LENGTH,
80: sizeof(SHA2_CTX),
81: (md_init_fn *) SHA256Init,
82: (md_update_fn *) SHA256Update,
83: (md_final_fn *) SHA256Final
84: },
85: {
86: SSH_DIGEST_SHA384,
87: "SHA384",
88: SHA384_BLOCK_LENGTH,
89: SHA384_DIGEST_LENGTH,
90: sizeof(SHA2_CTX),
91: (md_init_fn *) SHA384Init,
92: (md_update_fn *) SHA384Update,
93: (md_final_fn *) SHA384Final
94: },
95: {
96: SSH_DIGEST_SHA512,
97: "SHA512",
98: SHA512_BLOCK_LENGTH,
99: SHA512_DIGEST_LENGTH,
100: sizeof(SHA2_CTX),
101: (md_init_fn *) SHA512Init,
102: (md_update_fn *) SHA512Update,
103: (md_final_fn *) SHA512Final
104: }
105: };
106:
107: static const struct ssh_digest *
108: ssh_digest_by_alg(int alg)
109: {
110: if (alg < 0 || alg >= SSH_DIGEST_MAX)
111: return NULL;
112: if (digests[alg].id != alg) /* sanity */
113: return NULL;
114: return &(digests[alg]);
1.4 djm 115: }
116:
117: int
118: ssh_digest_alg_by_name(const char *name)
119: {
120: int alg;
121:
122: for (alg = 0; alg < SSH_DIGEST_MAX; alg++) {
123: if (strcasecmp(name, digests[alg].name) == 0)
124: return digests[alg].id;
125: }
126: return -1;
127: }
128:
129: const char *
130: ssh_digest_alg_name(int alg)
131: {
132: const struct ssh_digest *digest = ssh_digest_by_alg(alg);
133:
134: return digest == NULL ? NULL : digest->name;
1.1 markus 135: }
136:
137: size_t
138: ssh_digest_bytes(int alg)
139: {
140: const struct ssh_digest *digest = ssh_digest_by_alg(alg);
141:
142: return digest == NULL ? 0 : digest->digest_len;
143: }
144:
145: size_t
146: ssh_digest_blocksize(struct ssh_digest_ctx *ctx)
147: {
148: const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
149:
150: return digest == NULL ? 0 : digest->block_len;
151: }
152:
153: struct ssh_digest_ctx *
154: ssh_digest_start(int alg)
155: {
156: const struct ssh_digest *digest = ssh_digest_by_alg(alg);
157: struct ssh_digest_ctx *ret;
158:
1.5 jsg 159: if (digest == NULL || (ret = calloc(1, sizeof(*ret))) == NULL)
1.1 markus 160: return NULL;
161: if ((ret->mdctx = calloc(1, digest->ctx_len)) == NULL) {
162: free(ret);
163: return NULL;
164: }
165: ret->alg = alg;
166: digest->md_init(ret->mdctx);
167: return ret;
168: }
169:
170: int
171: ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to)
172: {
173: const struct ssh_digest *digest = ssh_digest_by_alg(from->alg);
174:
175: if (digest == NULL || from->alg != to->alg)
1.3 djm 176: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 177: memcpy(to->mdctx, from->mdctx, digest->ctx_len);
178: return 0;
179: }
180:
181: int
182: ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
183: {
184: const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
185:
186: if (digest == NULL)
1.3 djm 187: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 188: digest->md_update(ctx->mdctx, m, mlen);
189: return 0;
190: }
191:
192: int
1.3 djm 193: ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const struct sshbuf *b)
1.1 markus 194: {
1.3 djm 195: return ssh_digest_update(ctx, sshbuf_ptr(b), sshbuf_len(b));
1.1 markus 196: }
197:
198: int
199: ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
200: {
201: const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
202:
203: if (digest == NULL)
1.3 djm 204: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 205: if (dlen > UINT_MAX)
1.3 djm 206: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 207: if (dlen < digest->digest_len) /* No truncation allowed */
1.3 djm 208: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 209: digest->md_final(d, ctx->mdctx);
210: return 0;
211: }
212:
213: void
214: ssh_digest_free(struct ssh_digest_ctx *ctx)
215: {
216: const struct ssh_digest *digest;
217:
218: if (ctx != NULL) {
219: digest = ssh_digest_by_alg(ctx->alg);
220: if (digest) {
1.2 djm 221: explicit_bzero(ctx->mdctx, digest->ctx_len);
1.1 markus 222: free(ctx->mdctx);
1.7 ! jsg 223: freezero(ctx, sizeof(*ctx));
1.1 markus 224: }
225: }
226: }
227:
228: int
229: ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
230: {
231: struct ssh_digest_ctx *ctx = ssh_digest_start(alg);
232:
233: if (ctx == NULL)
1.3 djm 234: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 235: if (ssh_digest_update(ctx, m, mlen) != 0 ||
236: ssh_digest_final(ctx, d, dlen) != 0)
1.3 djm 237: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 238: ssh_digest_free(ctx);
239: return 0;
240: }
241:
242: int
1.3 djm 243: ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen)
1.1 markus 244: {
1.3 djm 245: return ssh_digest_memory(alg, sshbuf_ptr(b), sshbuf_len(b), d, dlen);
1.1 markus 246: }
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