Annotation of src/usr.bin/ssh/digest-libc.c, Revision 1.3
1.3 ! djm 1: /* $OpenBSD: digest-libc.c,v 1.2 2014/02/02 03:44:31 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_RIPEMD160,
67: "RIPEMD160",
68: RMD160_BLOCK_LENGTH,
69: RMD160_DIGEST_LENGTH,
70: sizeof(RMD160_CTX),
71: (md_init_fn *) RMD160Init,
72: (md_update_fn *) RMD160Update,
73: (md_final_fn *) RMD160Final
74: },
75: {
76: SSH_DIGEST_SHA1,
77: "SHA1",
78: SHA1_BLOCK_LENGTH,
79: SHA1_DIGEST_LENGTH,
80: sizeof(SHA1_CTX),
81: (md_init_fn *) SHA1Init,
82: (md_update_fn *) SHA1Update,
83: (md_final_fn *) SHA1Final
84: },
85: {
86: SSH_DIGEST_SHA256,
87: "SHA256",
88: SHA256_BLOCK_LENGTH,
89: SHA256_DIGEST_LENGTH,
90: sizeof(SHA2_CTX),
91: (md_init_fn *) SHA256Init,
92: (md_update_fn *) SHA256Update,
93: (md_final_fn *) SHA256Final
94: },
95: {
96: SSH_DIGEST_SHA384,
97: "SHA384",
98: SHA384_BLOCK_LENGTH,
99: SHA384_DIGEST_LENGTH,
100: sizeof(SHA2_CTX),
101: (md_init_fn *) SHA384Init,
102: (md_update_fn *) SHA384Update,
103: (md_final_fn *) SHA384Final
104: },
105: {
106: SSH_DIGEST_SHA512,
107: "SHA512",
108: SHA512_BLOCK_LENGTH,
109: SHA512_DIGEST_LENGTH,
110: sizeof(SHA2_CTX),
111: (md_init_fn *) SHA512Init,
112: (md_update_fn *) SHA512Update,
113: (md_final_fn *) SHA512Final
114: }
115: };
116:
117: static const struct ssh_digest *
118: ssh_digest_by_alg(int alg)
119: {
120: if (alg < 0 || alg >= SSH_DIGEST_MAX)
121: return NULL;
122: if (digests[alg].id != alg) /* sanity */
123: return NULL;
124: return &(digests[alg]);
125: }
126:
127: size_t
128: ssh_digest_bytes(int alg)
129: {
130: const struct ssh_digest *digest = ssh_digest_by_alg(alg);
131:
132: return digest == NULL ? 0 : digest->digest_len;
133: }
134:
135: size_t
136: ssh_digest_blocksize(struct ssh_digest_ctx *ctx)
137: {
138: const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
139:
140: return digest == NULL ? 0 : digest->block_len;
141: }
142:
143: struct ssh_digest_ctx *
144: ssh_digest_start(int alg)
145: {
146: const struct ssh_digest *digest = ssh_digest_by_alg(alg);
147: struct ssh_digest_ctx *ret;
148:
149: if (digest == NULL || (ret = calloc(1, sizeof(ret))) == NULL)
150: return NULL;
151: if ((ret->mdctx = calloc(1, digest->ctx_len)) == NULL) {
152: free(ret);
153: return NULL;
154: }
155: ret->alg = alg;
156: digest->md_init(ret->mdctx);
157: return ret;
158: }
159:
160: int
161: ssh_digest_copy_state(struct ssh_digest_ctx *from, struct ssh_digest_ctx *to)
162: {
163: const struct ssh_digest *digest = ssh_digest_by_alg(from->alg);
164:
165: if (digest == NULL || from->alg != to->alg)
1.3 ! djm 166: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 167: memcpy(to->mdctx, from->mdctx, digest->ctx_len);
168: return 0;
169: }
170:
171: int
172: ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
173: {
174: const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
175:
176: if (digest == NULL)
1.3 ! djm 177: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 178: digest->md_update(ctx->mdctx, m, mlen);
179: return 0;
180: }
181:
182: int
1.3 ! djm 183: ssh_digest_update_buffer(struct ssh_digest_ctx *ctx, const struct sshbuf *b)
1.1 markus 184: {
1.3 ! djm 185: return ssh_digest_update(ctx, sshbuf_ptr(b), sshbuf_len(b));
1.1 markus 186: }
187:
188: int
189: ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
190: {
191: const struct ssh_digest *digest = ssh_digest_by_alg(ctx->alg);
192:
193: if (digest == NULL)
1.3 ! djm 194: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 195: if (dlen > UINT_MAX)
1.3 ! djm 196: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 197: if (dlen < digest->digest_len) /* No truncation allowed */
1.3 ! djm 198: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 199: digest->md_final(d, ctx->mdctx);
200: return 0;
201: }
202:
203: void
204: ssh_digest_free(struct ssh_digest_ctx *ctx)
205: {
206: const struct ssh_digest *digest;
207:
208: if (ctx != NULL) {
209: digest = ssh_digest_by_alg(ctx->alg);
210: if (digest) {
1.2 djm 211: explicit_bzero(ctx->mdctx, digest->ctx_len);
1.1 markus 212: free(ctx->mdctx);
1.2 djm 213: explicit_bzero(ctx, sizeof(*ctx));
1.1 markus 214: free(ctx);
215: }
216: }
217: }
218:
219: int
220: ssh_digest_memory(int alg, const void *m, size_t mlen, u_char *d, size_t dlen)
221: {
222: struct ssh_digest_ctx *ctx = ssh_digest_start(alg);
223:
224: if (ctx == NULL)
1.3 ! djm 225: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 226: if (ssh_digest_update(ctx, m, mlen) != 0 ||
227: ssh_digest_final(ctx, d, dlen) != 0)
1.3 ! djm 228: return SSH_ERR_INVALID_ARGUMENT;
1.1 markus 229: ssh_digest_free(ctx);
230: return 0;
231: }
232:
233: int
1.3 ! djm 234: ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen)
1.1 markus 235: {
1.3 ! djm 236: return ssh_digest_memory(alg, sshbuf_ptr(b), sshbuf_len(b), d, dlen);
1.1 markus 237: }
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