Annotation of src/usr.bin/ssh/hmac.c, Revision 1.13
1.13 ! djm 1: /* $OpenBSD: hmac.c,v 1.12 2015/03/24 20:03:44 markus Exp $ */
1.1 markus 2: /*
1.9 markus 3: * Copyright (c) 2014 Markus Friedl. All rights reserved.
1.1 markus 4: *
1.9 markus 5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
1.1 markus 8: *
1.9 markus 9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1 markus 16: */
17:
1.9 markus 18: #include <sys/types.h>
19: #include <string.h>
1.13 ! djm 20: #include <stdlib.h>
1.1 markus 21:
1.11 markus 22: #include "sshbuf.h"
1.9 markus 23: #include "digest.h"
24: #include "hmac.h"
1.1 markus 25:
1.9 markus 26: struct ssh_hmac_ctx {
27: int alg;
28: struct ssh_digest_ctx *ictx;
29: struct ssh_digest_ctx *octx;
30: struct ssh_digest_ctx *digest;
31: u_char *buf;
32: size_t buf_len;
33: };
1.7 itojun 34:
1.9 markus 35: size_t
36: ssh_hmac_bytes(int alg)
37: {
38: return ssh_digest_bytes(alg);
39: }
40:
41: struct ssh_hmac_ctx *
42: ssh_hmac_start(int alg)
43: {
44: struct ssh_hmac_ctx *ret;
45:
46: if ((ret = calloc(1, sizeof(*ret))) == NULL)
47: return NULL;
48: ret->alg = alg;
49: if ((ret->ictx = ssh_digest_start(alg)) == NULL ||
50: (ret->octx = ssh_digest_start(alg)) == NULL ||
51: (ret->digest = ssh_digest_start(alg)) == NULL)
52: goto fail;
53: ret->buf_len = ssh_digest_blocksize(ret->ictx);
54: if ((ret->buf = calloc(1, ret->buf_len)) == NULL)
55: goto fail;
56: return ret;
57: fail:
58: ssh_hmac_free(ret);
59: return NULL;
60: }
61:
62: int
63: ssh_hmac_init(struct ssh_hmac_ctx *ctx, const void *key, size_t klen)
64: {
65: size_t i;
66:
67: /* reset ictx and octx if no is key given */
68: if (key != NULL) {
69: /* truncate long keys */
70: if (klen <= ctx->buf_len)
71: memcpy(ctx->buf, key, klen);
72: else if (ssh_digest_memory(ctx->alg, key, klen, ctx->buf,
73: ctx->buf_len) < 0)
74: return -1;
75: for (i = 0; i < ctx->buf_len; i++)
76: ctx->buf[i] ^= 0x36;
77: if (ssh_digest_update(ctx->ictx, ctx->buf, ctx->buf_len) < 0)
78: return -1;
79: for (i = 0; i < ctx->buf_len; i++)
80: ctx->buf[i] ^= 0x36 ^ 0x5c;
81: if (ssh_digest_update(ctx->octx, ctx->buf, ctx->buf_len) < 0)
82: return -1;
1.10 tedu 83: explicit_bzero(ctx->buf, ctx->buf_len);
1.9 markus 84: }
85: /* start with ictx */
86: if (ssh_digest_copy_state(ctx->ictx, ctx->digest) < 0)
87: return -1;
88: return 0;
89: }
90:
91: int
92: ssh_hmac_update(struct ssh_hmac_ctx *ctx, const void *m, size_t mlen)
93: {
94: return ssh_digest_update(ctx->digest, m, mlen);
95: }
96:
97: int
1.11 markus 98: ssh_hmac_update_buffer(struct ssh_hmac_ctx *ctx, const struct sshbuf *b)
1.9 markus 99: {
100: return ssh_digest_update_buffer(ctx->digest, b);
101: }
102:
103: int
104: ssh_hmac_final(struct ssh_hmac_ctx *ctx, u_char *d, size_t dlen)
105: {
106: size_t len;
107:
108: len = ssh_digest_bytes(ctx->alg);
109: if (dlen < len ||
110: ssh_digest_final(ctx->digest, ctx->buf, len))
111: return -1;
112: /* switch to octx */
113: if (ssh_digest_copy_state(ctx->octx, ctx->digest) < 0 ||
114: ssh_digest_update(ctx->digest, ctx->buf, len) < 0 ||
115: ssh_digest_final(ctx->digest, d, dlen) < 0)
116: return -1;
117: return 0;
118: }
119:
120: void
121: ssh_hmac_free(struct ssh_hmac_ctx *ctx)
122: {
123: if (ctx != NULL) {
124: ssh_digest_free(ctx->ictx);
125: ssh_digest_free(ctx->octx);
126: ssh_digest_free(ctx->digest);
127: if (ctx->buf) {
1.10 tedu 128: explicit_bzero(ctx->buf, ctx->buf_len);
1.9 markus 129: free(ctx->buf);
130: }
1.10 tedu 131: explicit_bzero(ctx, sizeof(*ctx));
1.9 markus 132: free(ctx);
133: }
134: }
135:
136: #ifdef TEST
137:
138: /* cc -DTEST hmac.c digest.c buffer.c cleanup.c fatal.c log.c xmalloc.c -lcrypto */
139: static void
140: hmac_test(void *key, size_t klen, void *m, size_t mlen, u_char *e, size_t elen)
141: {
142: struct ssh_hmac_ctx *ctx;
143: size_t i;
144: u_char digest[16];
145:
146: if ((ctx = ssh_hmac_start(SSH_DIGEST_MD5)) == NULL)
147: printf("ssh_hmac_start failed");
148: if (ssh_hmac_init(ctx, key, klen) < 0 ||
149: ssh_hmac_update(ctx, m, mlen) < 0 ||
150: ssh_hmac_final(ctx, digest, sizeof(digest)) < 0)
151: printf("ssh_hmac_xxx failed");
152: ssh_hmac_free(ctx);
153:
154: if (memcmp(e, digest, elen)) {
155: for (i = 0; i < elen; i++)
1.12 markus 156: printf("[%zu] %2.2x %2.2x\n", i, e[i], digest[i]);
1.9 markus 157: printf("mismatch\n");
158: } else
159: printf("ok\n");
160: }
161:
162: int
163: main(int argc, char **argv)
164: {
165: /* try test vectors from RFC 2104 */
166:
167: u_char key1[16] = {
168: 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb,
169: 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb };
170: u_char *data1 = "Hi There";
171: u_char dig1[16] = {
172: 0x92, 0x94, 0x72, 0x7a, 0x36, 0x38, 0xbb, 0x1c,
173: 0x13, 0xf4, 0x8e, 0xf8, 0x15, 0x8b, 0xfc, 0x9d };
174:
175: u_char *key2 = "Jefe";
176: u_char *data2 = "what do ya want for nothing?";
177: u_char dig2[16] = {
178: 0x75, 0x0c, 0x78, 0x3e, 0x6a, 0xb0, 0xb5, 0x03,
179: 0xea, 0xa8, 0x6e, 0x31, 0x0a, 0x5d, 0xb7, 0x38 };
180:
181: u_char key3[16];
182: u_char data3[50];
183: u_char dig3[16] = {
184: 0x56, 0xbe, 0x34, 0x52, 0x1d, 0x14, 0x4c, 0x88,
185: 0xdb, 0xb8, 0xc7, 0x33, 0xf0, 0xe8, 0xb3, 0xf6 };
186: memset(key3, 0xaa, sizeof(key3));
187: memset(data3, 0xdd, sizeof(data3));
188:
189: hmac_test(key1, sizeof(key1), data1, strlen(data1), dig1, sizeof(dig1));
190: hmac_test(key2, strlen(key2), data2, strlen(data2), dig2, sizeof(dig2));
191: hmac_test(key3, sizeof(key3), data3, sizeof(data3), dig3, sizeof(dig3));
1.1 markus 192:
1.9 markus 193: return 0;
1.1 markus 194: }
1.9 markus 195:
196: #endif
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