Annotation of src/usr.bin/ssh/hmac.c, Revision 1.12
1.12 ! markus 1: /* $OpenBSD: hmac.c,v 1.11 2015/01/15 21:37:14 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>
1.1 markus 20:
1.11 markus 21: #include "sshbuf.h"
1.9 markus 22: #include "digest.h"
23: #include "hmac.h"
1.1 markus 24:
1.9 markus 25: struct ssh_hmac_ctx {
26: int alg;
27: struct ssh_digest_ctx *ictx;
28: struct ssh_digest_ctx *octx;
29: struct ssh_digest_ctx *digest;
30: u_char *buf;
31: size_t buf_len;
32: };
1.7 itojun 33:
1.9 markus 34: size_t
35: ssh_hmac_bytes(int alg)
36: {
37: return ssh_digest_bytes(alg);
38: }
39:
40: struct ssh_hmac_ctx *
41: ssh_hmac_start(int alg)
42: {
43: struct ssh_hmac_ctx *ret;
44:
45: if ((ret = calloc(1, sizeof(*ret))) == NULL)
46: return NULL;
47: ret->alg = alg;
48: if ((ret->ictx = ssh_digest_start(alg)) == NULL ||
49: (ret->octx = ssh_digest_start(alg)) == NULL ||
50: (ret->digest = ssh_digest_start(alg)) == NULL)
51: goto fail;
52: ret->buf_len = ssh_digest_blocksize(ret->ictx);
53: if ((ret->buf = calloc(1, ret->buf_len)) == NULL)
54: goto fail;
55: return ret;
56: fail:
57: ssh_hmac_free(ret);
58: return NULL;
59: }
60:
61: int
62: ssh_hmac_init(struct ssh_hmac_ctx *ctx, const void *key, size_t klen)
63: {
64: size_t i;
65:
66: /* reset ictx and octx if no is key given */
67: if (key != NULL) {
68: /* truncate long keys */
69: if (klen <= ctx->buf_len)
70: memcpy(ctx->buf, key, klen);
71: else if (ssh_digest_memory(ctx->alg, key, klen, ctx->buf,
72: ctx->buf_len) < 0)
73: return -1;
74: for (i = 0; i < ctx->buf_len; i++)
75: ctx->buf[i] ^= 0x36;
76: if (ssh_digest_update(ctx->ictx, ctx->buf, ctx->buf_len) < 0)
77: return -1;
78: for (i = 0; i < ctx->buf_len; i++)
79: ctx->buf[i] ^= 0x36 ^ 0x5c;
80: if (ssh_digest_update(ctx->octx, ctx->buf, ctx->buf_len) < 0)
81: return -1;
1.10 tedu 82: explicit_bzero(ctx->buf, ctx->buf_len);
1.9 markus 83: }
84: /* start with ictx */
85: if (ssh_digest_copy_state(ctx->ictx, ctx->digest) < 0)
86: return -1;
87: return 0;
88: }
89:
90: int
91: ssh_hmac_update(struct ssh_hmac_ctx *ctx, const void *m, size_t mlen)
92: {
93: return ssh_digest_update(ctx->digest, m, mlen);
94: }
95:
96: int
1.11 markus 97: ssh_hmac_update_buffer(struct ssh_hmac_ctx *ctx, const struct sshbuf *b)
1.9 markus 98: {
99: return ssh_digest_update_buffer(ctx->digest, b);
100: }
101:
102: int
103: ssh_hmac_final(struct ssh_hmac_ctx *ctx, u_char *d, size_t dlen)
104: {
105: size_t len;
106:
107: len = ssh_digest_bytes(ctx->alg);
108: if (dlen < len ||
109: ssh_digest_final(ctx->digest, ctx->buf, len))
110: return -1;
111: /* switch to octx */
112: if (ssh_digest_copy_state(ctx->octx, ctx->digest) < 0 ||
113: ssh_digest_update(ctx->digest, ctx->buf, len) < 0 ||
114: ssh_digest_final(ctx->digest, d, dlen) < 0)
115: return -1;
116: return 0;
117: }
118:
119: void
120: ssh_hmac_free(struct ssh_hmac_ctx *ctx)
121: {
122: if (ctx != NULL) {
123: ssh_digest_free(ctx->ictx);
124: ssh_digest_free(ctx->octx);
125: ssh_digest_free(ctx->digest);
126: if (ctx->buf) {
1.10 tedu 127: explicit_bzero(ctx->buf, ctx->buf_len);
1.9 markus 128: free(ctx->buf);
129: }
1.10 tedu 130: explicit_bzero(ctx, sizeof(*ctx));
1.9 markus 131: free(ctx);
132: }
133: }
134:
135: #ifdef TEST
136:
137: /* cc -DTEST hmac.c digest.c buffer.c cleanup.c fatal.c log.c xmalloc.c -lcrypto */
138: static void
139: hmac_test(void *key, size_t klen, void *m, size_t mlen, u_char *e, size_t elen)
140: {
141: struct ssh_hmac_ctx *ctx;
142: size_t i;
143: u_char digest[16];
144:
145: if ((ctx = ssh_hmac_start(SSH_DIGEST_MD5)) == NULL)
146: printf("ssh_hmac_start failed");
147: if (ssh_hmac_init(ctx, key, klen) < 0 ||
148: ssh_hmac_update(ctx, m, mlen) < 0 ||
149: ssh_hmac_final(ctx, digest, sizeof(digest)) < 0)
150: printf("ssh_hmac_xxx failed");
151: ssh_hmac_free(ctx);
152:
153: if (memcmp(e, digest, elen)) {
154: for (i = 0; i < elen; i++)
1.12 ! markus 155: printf("[%zu] %2.2x %2.2x\n", i, e[i], digest[i]);
1.9 markus 156: printf("mismatch\n");
157: } else
158: printf("ok\n");
159: }
160:
161: int
162: main(int argc, char **argv)
163: {
164: /* try test vectors from RFC 2104 */
165:
166: u_char key1[16] = {
167: 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb,
168: 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb };
169: u_char *data1 = "Hi There";
170: u_char dig1[16] = {
171: 0x92, 0x94, 0x72, 0x7a, 0x36, 0x38, 0xbb, 0x1c,
172: 0x13, 0xf4, 0x8e, 0xf8, 0x15, 0x8b, 0xfc, 0x9d };
173:
174: u_char *key2 = "Jefe";
175: u_char *data2 = "what do ya want for nothing?";
176: u_char dig2[16] = {
177: 0x75, 0x0c, 0x78, 0x3e, 0x6a, 0xb0, 0xb5, 0x03,
178: 0xea, 0xa8, 0x6e, 0x31, 0x0a, 0x5d, 0xb7, 0x38 };
179:
180: u_char key3[16];
181: u_char data3[50];
182: u_char dig3[16] = {
183: 0x56, 0xbe, 0x34, 0x52, 0x1d, 0x14, 0x4c, 0x88,
184: 0xdb, 0xb8, 0xc7, 0x33, 0xf0, 0xe8, 0xb3, 0xf6 };
185: memset(key3, 0xaa, sizeof(key3));
186: memset(data3, 0xdd, sizeof(data3));
187:
188: hmac_test(key1, sizeof(key1), data1, strlen(data1), dig1, sizeof(dig1));
189: hmac_test(key2, strlen(key2), data2, strlen(data2), dig2, sizeof(dig2));
190: hmac_test(key3, sizeof(key3), data3, sizeof(data3), dig3, sizeof(dig3));
1.1 markus 191:
1.9 markus 192: return 0;
1.1 markus 193: }
1.9 markus 194:
195: #endif
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