1 /* $OpenBSD: hmac.c,v 1.14 2020/02/26 13:40:09 jsg Exp $ */
3 * Copyright (c) 2014 Markus Friedl. All rights reserved.
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.
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.
20 #include <sys/types.h>
31 struct ssh_digest_ctx *ictx;
32 struct ssh_digest_ctx *octx;
33 struct ssh_digest_ctx *digest;
39 ssh_hmac_bytes(int alg)
41 return ssh_digest_bytes(alg);
45 ssh_hmac_start(int alg)
47 struct ssh_hmac_ctx *ret;
49 if ((ret = calloc(1, sizeof(*ret))) == NULL)
52 if ((ret->ictx = ssh_digest_start(alg)) == NULL ||
53 (ret->octx = ssh_digest_start(alg)) == NULL ||
54 (ret->digest = ssh_digest_start(alg)) == NULL)
56 ret->buf_len = ssh_digest_blocksize(ret->ictx);
57 if ((ret->buf = calloc(1, ret->buf_len)) == NULL)
66 ssh_hmac_init(struct ssh_hmac_ctx *ctx, const void *key, size_t klen)
70 /* reset ictx and octx if no is key given */
72 /* truncate long keys */
73 if (klen <= ctx->buf_len)
74 memcpy(ctx->buf, key, klen);
75 else if (ssh_digest_memory(ctx->alg, key, klen, ctx->buf,
78 for (i = 0; i < ctx->buf_len; i++)
80 if (ssh_digest_update(ctx->ictx, ctx->buf, ctx->buf_len) < 0)
82 for (i = 0; i < ctx->buf_len; i++)
83 ctx->buf[i] ^= 0x36 ^ 0x5c;
84 if (ssh_digest_update(ctx->octx, ctx->buf, ctx->buf_len) < 0)
86 explicit_bzero(ctx->buf, ctx->buf_len);
89 if (ssh_digest_copy_state(ctx->ictx, ctx->digest) < 0)
95 ssh_hmac_update(struct ssh_hmac_ctx *ctx, const void *m, size_t mlen)
97 return ssh_digest_update(ctx->digest, m, mlen);
101 ssh_hmac_update_buffer(struct ssh_hmac_ctx *ctx, const struct sshbuf *b)
103 return ssh_digest_update_buffer(ctx->digest, b);
107 ssh_hmac_final(struct ssh_hmac_ctx *ctx, u_char *d, size_t dlen)
111 len = ssh_digest_bytes(ctx->alg);
113 ssh_digest_final(ctx->digest, ctx->buf, len))
116 if (ssh_digest_copy_state(ctx->octx, ctx->digest) < 0 ||
117 ssh_digest_update(ctx->digest, ctx->buf, len) < 0 ||
118 ssh_digest_final(ctx->digest, d, dlen) < 0)
124 ssh_hmac_free(struct ssh_hmac_ctx *ctx)
127 ssh_digest_free(ctx->ictx);
128 ssh_digest_free(ctx->octx);
129 ssh_digest_free(ctx->digest);
131 explicit_bzero(ctx->buf, ctx->buf_len);
134 freezero(ctx, sizeof(*ctx));
140 /* cc -DTEST hmac.c digest.c buffer.c cleanup.c fatal.c log.c xmalloc.c -lcrypto */
142 hmac_test(void *key, size_t klen, void *m, size_t mlen, u_char *e, size_t elen)
144 struct ssh_hmac_ctx *ctx;
148 if ((ctx = ssh_hmac_start(SSH_DIGEST_MD5)) == NULL)
149 printf("ssh_hmac_start failed");
150 if (ssh_hmac_init(ctx, key, klen) < 0 ||
151 ssh_hmac_update(ctx, m, mlen) < 0 ||
152 ssh_hmac_final(ctx, digest, sizeof(digest)) < 0)
153 printf("ssh_hmac_xxx failed");
156 if (memcmp(e, digest, elen)) {
157 for (i = 0; i < elen; i++)
158 printf("[%zu] %2.2x %2.2x\n", i, e[i], digest[i]);
159 printf("mismatch\n");
165 main(int argc, char **argv)
167 /* try test vectors from RFC 2104 */
170 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb,
171 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb };
172 u_char *data1 = "Hi There";
174 0x92, 0x94, 0x72, 0x7a, 0x36, 0x38, 0xbb, 0x1c,
175 0x13, 0xf4, 0x8e, 0xf8, 0x15, 0x8b, 0xfc, 0x9d };
177 u_char *key2 = "Jefe";
178 u_char *data2 = "what do ya want for nothing?";
180 0x75, 0x0c, 0x78, 0x3e, 0x6a, 0xb0, 0xb5, 0x03,
181 0xea, 0xa8, 0x6e, 0x31, 0x0a, 0x5d, 0xb7, 0x38 };
186 0x56, 0xbe, 0x34, 0x52, 0x1d, 0x14, 0x4c, 0x88,
187 0xdb, 0xb8, 0xc7, 0x33, 0xf0, 0xe8, 0xb3, 0xf6 };
188 memset(key3, 0xaa, sizeof(key3));
189 memset(data3, 0xdd, sizeof(data3));
191 hmac_test(key1, sizeof(key1), data1, strlen(data1), dig1, sizeof(dig1));
192 hmac_test(key2, strlen(key2), data2, strlen(data2), dig2, sizeof(dig2));
193 hmac_test(key3, sizeof(key3), data3, sizeof(data3), dig3, sizeof(dig3));