xref: /freebsd/sys/geom/eli/g_eli.h (revision 10b9d77bf1ccf2f3affafa6261692cb92cf7e992)
1 /*-
2  * Copyright (c) 2005-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  * $FreeBSD$
27  */
28 
29 #ifndef	_G_ELI_H_
30 #define	_G_ELI_H_
31 
32 #include <sys/endian.h>
33 #include <sys/errno.h>
34 #include <sys/malloc.h>
35 #include <crypto/sha2/sha2.h>
36 #include <opencrypto/cryptodev.h>
37 #ifdef _KERNEL
38 #include <sys/bio.h>
39 #include <sys/libkern.h>
40 #include <geom/geom.h>
41 #else
42 #include <stdio.h>
43 #include <string.h>
44 #include <strings.h>
45 #endif
46 #ifndef _OpenSSL_
47 #include <sys/md5.h>
48 #endif
49 
50 #define	G_ELI_CLASS_NAME	"ELI"
51 #define	G_ELI_MAGIC		"GEOM::ELI"
52 #define	G_ELI_SUFFIX		".eli"
53 
54 /*
55  * Version history:
56  * 0 - Initial version number.
57  * 1 - Added data authentication support (md_aalgo field and
58  *     G_ELI_FLAG_AUTH flag).
59  * 2 - Added G_ELI_FLAG_READONLY.
60  * 3 - Added 'configure' subcommand.
61  * 4 - IV is generated from offset converted to little-endian
62  *     (flag G_ELI_FLAG_NATIVE_BYTE_ORDER will be set for older versions).
63  * 5 - Added multiple encrypton keys and AES-XTS support.
64  */
65 #define	G_ELI_VERSION		5
66 
67 /* ON DISK FLAGS. */
68 /* Use random, onetime keys. */
69 #define	G_ELI_FLAG_ONETIME		0x00000001
70 /* Ask for the passphrase from the kernel, before mounting root. */
71 #define	G_ELI_FLAG_BOOT			0x00000002
72 /* Detach on last close, if we were open for writing. */
73 #define	G_ELI_FLAG_WO_DETACH		0x00000004
74 /* Detach on last close. */
75 #define	G_ELI_FLAG_RW_DETACH		0x00000008
76 /* Provide data authentication. */
77 #define	G_ELI_FLAG_AUTH			0x00000010
78 /* Provider is read-only, we should deny all write attempts. */
79 #define	G_ELI_FLAG_RO			0x00000020
80 /* RUNTIME FLAGS. */
81 /* Provider was open for writing. */
82 #define	G_ELI_FLAG_WOPEN		0x00010000
83 /* Destroy device. */
84 #define	G_ELI_FLAG_DESTROY		0x00020000
85 /* Provider uses native byte-order for IV generation. */
86 #define	G_ELI_FLAG_NATIVE_BYTE_ORDER	0x00040000
87 /* Provider uses single encryption key. */
88 #define	G_ELI_FLAG_SINGLE_KEY		0x00080000
89 /* Device suspended. */
90 #define	G_ELI_FLAG_SUSPEND		0x00100000
91 
92 #define	G_ELI_NEW_BIO	255
93 
94 #define	SHA512_MDLEN		64
95 #define	G_ELI_AUTH_SECKEYLEN	SHA256_DIGEST_LENGTH
96 
97 #define	G_ELI_MAXMKEYS		2
98 #define	G_ELI_MAXKEYLEN		64
99 #define	G_ELI_USERKEYLEN	G_ELI_MAXKEYLEN
100 #define	G_ELI_DATAKEYLEN	G_ELI_MAXKEYLEN
101 #define	G_ELI_AUTHKEYLEN	G_ELI_MAXKEYLEN
102 #define	G_ELI_IVKEYLEN		G_ELI_MAXKEYLEN
103 #define	G_ELI_SALTLEN		64
104 #define	G_ELI_DATAIVKEYLEN	(G_ELI_DATAKEYLEN + G_ELI_IVKEYLEN)
105 /* Data-Key, IV-Key, HMAC_SHA512(Derived-Key, Data-Key+IV-Key) */
106 #define	G_ELI_MKEYLEN		(G_ELI_DATAIVKEYLEN + SHA512_MDLEN)
107 #define	G_ELI_OVERWRITES	5
108 /* Switch data encryption key every 2^20 blocks. */
109 #define	G_ELI_KEY_SHIFT		20
110 
111 #ifdef _KERNEL
112 extern int g_eli_debug;
113 extern u_int g_eli_overwrites;
114 extern u_int g_eli_batch;
115 
116 #define	G_ELI_CRYPTO_UNKNOWN	0
117 #define	G_ELI_CRYPTO_HW		1
118 #define	G_ELI_CRYPTO_SW		2
119 
120 #define	G_ELI_DEBUG(lvl, ...)	do {					\
121 	if (g_eli_debug >= (lvl)) {					\
122 		printf("GEOM_ELI");					\
123 		if (g_eli_debug > 0)					\
124 			printf("[%u]", lvl);				\
125 		printf(": ");						\
126 		printf(__VA_ARGS__);					\
127 		printf("\n");						\
128 	}								\
129 } while (0)
130 #define	G_ELI_LOGREQ(lvl, bp, ...)	do {				\
131 	if (g_eli_debug >= (lvl)) {					\
132 		printf("GEOM_ELI");					\
133 		if (g_eli_debug > 0)					\
134 			printf("[%u]", lvl);				\
135 		printf(": ");						\
136 		printf(__VA_ARGS__);					\
137 		printf(" ");						\
138 		g_print_bio(bp);					\
139 		printf("\n");						\
140 	}								\
141 } while (0)
142 
143 struct g_eli_worker {
144 	struct g_eli_softc	*w_softc;
145 	struct proc		*w_proc;
146 	u_int			 w_number;
147 	uint64_t		 w_sid;
148 	boolean_t		 w_active;
149 	LIST_ENTRY(g_eli_worker) w_next;
150 };
151 
152 struct g_eli_softc {
153 	struct g_geom	 *sc_geom;
154 	u_int		  sc_crypto;
155 	uint8_t		  sc_mkey[G_ELI_DATAIVKEYLEN];
156 	uint8_t		**sc_ekeys;
157 	u_int		  sc_nekeys;
158 	u_int		  sc_ealgo;
159 	u_int		  sc_ekeylen;
160 	uint8_t		  sc_akey[G_ELI_AUTHKEYLEN];
161 	u_int		  sc_aalgo;
162 	u_int		  sc_akeylen;
163 	u_int		  sc_alen;
164 	SHA256_CTX	  sc_akeyctx;
165 	uint8_t		  sc_ivkey[G_ELI_IVKEYLEN];
166 	SHA256_CTX	  sc_ivctx;
167 	int		  sc_nkey;
168 	uint32_t	  sc_flags;
169 	int		  sc_inflight;
170 	off_t		  sc_mediasize;
171 	size_t		  sc_sectorsize;
172 	u_int		  sc_bytes_per_sector;
173 	u_int		  sc_data_per_sector;
174 
175 	/* Only for software cryptography. */
176 	struct bio_queue_head sc_queue;
177 	struct mtx	  sc_queue_mtx;
178 	LIST_HEAD(, g_eli_worker) sc_workers;
179 };
180 #define	sc_name		 sc_geom->name
181 #endif	/* _KERNEL */
182 
183 struct g_eli_metadata {
184 	char		md_magic[16];	/* Magic value. */
185 	uint32_t	md_version;	/* Version number. */
186 	uint32_t	md_flags;	/* Additional flags. */
187 	uint16_t	md_ealgo;	/* Encryption algorithm. */
188 	uint16_t	md_keylen;	/* Key length. */
189 	uint16_t	md_aalgo;	/* Authentication algorithm. */
190 	uint64_t	md_provsize;	/* Provider's size. */
191 	uint32_t	md_sectorsize;	/* Sector size. */
192 	uint8_t		md_keys;	/* Available keys. */
193 	int32_t		md_iterations;	/* Number of iterations for PKCS#5v2. */
194 	uint8_t		md_salt[G_ELI_SALTLEN]; /* Salt. */
195 			/* Encrypted master key (IV-key, Data-key, HMAC). */
196 	uint8_t		md_mkeys[G_ELI_MAXMKEYS * G_ELI_MKEYLEN];
197 	u_char		md_hash[16];	/* MD5 hash. */
198 } __packed;
199 #ifndef _OpenSSL_
200 static __inline void
201 eli_metadata_encode(struct g_eli_metadata *md, u_char *data)
202 {
203 	MD5_CTX ctx;
204 	u_char *p;
205 
206 	p = data;
207 	bcopy(md->md_magic, p, sizeof(md->md_magic)); p += sizeof(md->md_magic);
208 	le32enc(p, md->md_version);	p += sizeof(md->md_version);
209 	le32enc(p, md->md_flags);	p += sizeof(md->md_flags);
210 	le16enc(p, md->md_ealgo);	p += sizeof(md->md_ealgo);
211 	le16enc(p, md->md_keylen);	p += sizeof(md->md_keylen);
212 	le16enc(p, md->md_aalgo);	p += sizeof(md->md_aalgo);
213 	le64enc(p, md->md_provsize);	p += sizeof(md->md_provsize);
214 	le32enc(p, md->md_sectorsize);	p += sizeof(md->md_sectorsize);
215 	*p = md->md_keys;		p += sizeof(md->md_keys);
216 	le32enc(p, md->md_iterations);	p += sizeof(md->md_iterations);
217 	bcopy(md->md_salt, p, sizeof(md->md_salt)); p += sizeof(md->md_salt);
218 	bcopy(md->md_mkeys, p, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys);
219 	MD5Init(&ctx);
220 	MD5Update(&ctx, data, p - data);
221 	MD5Final(md->md_hash, &ctx);
222 	bcopy(md->md_hash, p, sizeof(md->md_hash));
223 }
224 static __inline int
225 eli_metadata_decode_v0(const u_char *data, struct g_eli_metadata *md)
226 {
227 	MD5_CTX ctx;
228 	const u_char *p;
229 
230 	p = data + sizeof(md->md_magic) + sizeof(md->md_version);
231 	md->md_flags = le32dec(p);	p += sizeof(md->md_flags);
232 	md->md_ealgo = le16dec(p);	p += sizeof(md->md_ealgo);
233 	md->md_keylen = le16dec(p);	p += sizeof(md->md_keylen);
234 	md->md_provsize = le64dec(p);	p += sizeof(md->md_provsize);
235 	md->md_sectorsize = le32dec(p);	p += sizeof(md->md_sectorsize);
236 	md->md_keys = *p;		p += sizeof(md->md_keys);
237 	md->md_iterations = le32dec(p);	p += sizeof(md->md_iterations);
238 	bcopy(p, md->md_salt, sizeof(md->md_salt)); p += sizeof(md->md_salt);
239 	bcopy(p, md->md_mkeys, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys);
240 	MD5Init(&ctx);
241 	MD5Update(&ctx, data, p - data);
242 	MD5Final(md->md_hash, &ctx);
243 	if (bcmp(md->md_hash, p, 16) != 0)
244 		return (EINVAL);
245 	return (0);
246 }
247 
248 static __inline int
249 eli_metadata_decode_v1v2v3v4v5(const u_char *data, struct g_eli_metadata *md)
250 {
251 	MD5_CTX ctx;
252 	const u_char *p;
253 
254 	p = data + sizeof(md->md_magic) + sizeof(md->md_version);
255 	md->md_flags = le32dec(p);	p += sizeof(md->md_flags);
256 	md->md_ealgo = le16dec(p);	p += sizeof(md->md_ealgo);
257 	md->md_keylen = le16dec(p);	p += sizeof(md->md_keylen);
258 	md->md_aalgo = le16dec(p);	p += sizeof(md->md_aalgo);
259 	md->md_provsize = le64dec(p);	p += sizeof(md->md_provsize);
260 	md->md_sectorsize = le32dec(p);	p += sizeof(md->md_sectorsize);
261 	md->md_keys = *p;		p += sizeof(md->md_keys);
262 	md->md_iterations = le32dec(p);	p += sizeof(md->md_iterations);
263 	bcopy(p, md->md_salt, sizeof(md->md_salt)); p += sizeof(md->md_salt);
264 	bcopy(p, md->md_mkeys, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys);
265 	MD5Init(&ctx);
266 	MD5Update(&ctx, data, p - data);
267 	MD5Final(md->md_hash, &ctx);
268 	if (bcmp(md->md_hash, p, 16) != 0)
269 		return (EINVAL);
270 	return (0);
271 }
272 static __inline int
273 eli_metadata_decode(const u_char *data, struct g_eli_metadata *md)
274 {
275 	int error;
276 
277 	bcopy(data, md->md_magic, sizeof(md->md_magic));
278 	md->md_version = le32dec(data + sizeof(md->md_magic));
279 	switch (md->md_version) {
280 	case 0:
281 		error = eli_metadata_decode_v0(data, md);
282 		break;
283 	case 1:
284 	case 2:
285 	case 3:
286 	case 4:
287 	case 5:
288 		error = eli_metadata_decode_v1v2v3v4v5(data, md);
289 		break;
290 	default:
291 		error = EINVAL;
292 		break;
293 	}
294 	return (error);
295 }
296 #endif	/* !_OpenSSL */
297 
298 static __inline u_int
299 g_eli_str2ealgo(const char *name)
300 {
301 
302 	if (strcasecmp("null", name) == 0)
303 		return (CRYPTO_NULL_CBC);
304 	else if (strcasecmp("null-cbc", name) == 0)
305 		return (CRYPTO_NULL_CBC);
306 	else if (strcasecmp("aes", name) == 0)
307 		return (CRYPTO_AES_XTS);
308 	else if (strcasecmp("aes-cbc", name) == 0)
309 		return (CRYPTO_AES_CBC);
310 	else if (strcasecmp("aes-xts", name) == 0)
311 		return (CRYPTO_AES_XTS);
312 	else if (strcasecmp("blowfish", name) == 0)
313 		return (CRYPTO_BLF_CBC);
314 	else if (strcasecmp("blowfish-cbc", name) == 0)
315 		return (CRYPTO_BLF_CBC);
316 	else if (strcasecmp("camellia", name) == 0)
317 		return (CRYPTO_CAMELLIA_CBC);
318 	else if (strcasecmp("camellia-cbc", name) == 0)
319 		return (CRYPTO_CAMELLIA_CBC);
320 	else if (strcasecmp("3des", name) == 0)
321 		return (CRYPTO_3DES_CBC);
322 	else if (strcasecmp("3des-cbc", name) == 0)
323 		return (CRYPTO_3DES_CBC);
324 	return (CRYPTO_ALGORITHM_MIN - 1);
325 }
326 
327 static __inline u_int
328 g_eli_str2aalgo(const char *name)
329 {
330 
331 	if (strcasecmp("hmac/md5", name) == 0)
332 		return (CRYPTO_MD5_HMAC);
333 	else if (strcasecmp("hmac/sha1", name) == 0)
334 		return (CRYPTO_SHA1_HMAC);
335 	else if (strcasecmp("hmac/ripemd160", name) == 0)
336 		return (CRYPTO_RIPEMD160_HMAC);
337 	else if (strcasecmp("hmac/sha256", name) == 0)
338 		return (CRYPTO_SHA2_256_HMAC);
339 	else if (strcasecmp("hmac/sha384", name) == 0)
340 		return (CRYPTO_SHA2_384_HMAC);
341 	else if (strcasecmp("hmac/sha512", name) == 0)
342 		return (CRYPTO_SHA2_512_HMAC);
343 	return (CRYPTO_ALGORITHM_MIN - 1);
344 }
345 
346 static __inline const char *
347 g_eli_algo2str(u_int algo)
348 {
349 
350 	switch (algo) {
351 	case CRYPTO_NULL_CBC:
352 		return ("NULL");
353 	case CRYPTO_AES_CBC:
354 		return ("AES-CBC");
355 	case CRYPTO_AES_XTS:
356 		return ("AES-XTS");
357 	case CRYPTO_BLF_CBC:
358 		return ("Blowfish-CBC");
359 	case CRYPTO_CAMELLIA_CBC:
360 		return ("CAMELLIA-CBC");
361 	case CRYPTO_3DES_CBC:
362 		return ("3DES-CBC");
363 	case CRYPTO_MD5_HMAC:
364 		return ("HMAC/MD5");
365 	case CRYPTO_SHA1_HMAC:
366 		return ("HMAC/SHA1");
367 	case CRYPTO_RIPEMD160_HMAC:
368 		return ("HMAC/RIPEMD160");
369 	case CRYPTO_SHA2_256_HMAC:
370 		return ("HMAC/SHA256");
371 	case CRYPTO_SHA2_384_HMAC:
372 		return ("HMAC/SHA384");
373 	case CRYPTO_SHA2_512_HMAC:
374 		return ("HMAC/SHA512");
375 	}
376 	return ("unknown");
377 }
378 
379 static __inline void
380 eli_metadata_dump(const struct g_eli_metadata *md)
381 {
382 	static const char hex[] = "0123456789abcdef";
383 	char str[sizeof(md->md_mkeys) * 2 + 1];
384 	u_int i;
385 
386 	printf("     magic: %s\n", md->md_magic);
387 	printf("   version: %u\n", (u_int)md->md_version);
388 	printf("     flags: 0x%x\n", (u_int)md->md_flags);
389 	printf("     ealgo: %s\n", g_eli_algo2str(md->md_ealgo));
390 	printf("    keylen: %u\n", (u_int)md->md_keylen);
391 	if (md->md_flags & G_ELI_FLAG_AUTH)
392 		printf("     aalgo: %s\n", g_eli_algo2str(md->md_aalgo));
393 	printf("  provsize: %ju\n", (uintmax_t)md->md_provsize);
394 	printf("sectorsize: %u\n", (u_int)md->md_sectorsize);
395 	printf("      keys: 0x%02x\n", (u_int)md->md_keys);
396 	printf("iterations: %u\n", (u_int)md->md_iterations);
397 	bzero(str, sizeof(str));
398 	for (i = 0; i < sizeof(md->md_salt); i++) {
399 		str[i * 2] = hex[md->md_salt[i] >> 4];
400 		str[i * 2 + 1] = hex[md->md_salt[i] & 0x0f];
401 	}
402 	printf("      Salt: %s\n", str);
403 	bzero(str, sizeof(str));
404 	for (i = 0; i < sizeof(md->md_mkeys); i++) {
405 		str[i * 2] = hex[md->md_mkeys[i] >> 4];
406 		str[i * 2 + 1] = hex[md->md_mkeys[i] & 0x0f];
407 	}
408 	printf("Master Key: %s\n", str);
409 	bzero(str, sizeof(str));
410 	for (i = 0; i < 16; i++) {
411 		str[i * 2] = hex[md->md_hash[i] >> 4];
412 		str[i * 2 + 1] = hex[md->md_hash[i] & 0x0f];
413 	}
414 	printf("  MD5 hash: %s\n", str);
415 }
416 
417 static __inline u_int
418 g_eli_keylen(u_int algo, u_int keylen)
419 {
420 
421 	switch (algo) {
422 	case CRYPTO_NULL_CBC:
423 		if (keylen == 0)
424 			keylen = 64 * 8;
425 		else {
426 			if (keylen > 64 * 8)
427 				keylen = 0;
428 		}
429 		return (keylen);
430 	case CRYPTO_AES_CBC:
431 	case CRYPTO_CAMELLIA_CBC:
432 		switch (keylen) {
433 		case 0:
434 			return (128);
435 		case 128:
436 		case 192:
437 		case 256:
438 			return (keylen);
439 		default:
440 			return (0);
441 		}
442 	case CRYPTO_AES_XTS:
443 		switch (keylen) {
444 		case 0:
445 			return (128);
446 		case 128:
447 		case 256:
448 			return (keylen);
449 		default:
450 			return (0);
451 		}
452 	case CRYPTO_BLF_CBC:
453 		if (keylen == 0)
454 			return (128);
455 		if (keylen < 128 || keylen > 448)
456 			return (0);
457 		if ((keylen % 32) != 0)
458 			return (0);
459 		return (keylen);
460 	case CRYPTO_3DES_CBC:
461 		if (keylen == 0 || keylen == 192)
462 			return (192);
463 		return (0);
464 	default:
465 		return (0);
466 	}
467 }
468 
469 static __inline u_int
470 g_eli_hashlen(u_int algo)
471 {
472 
473 	switch (algo) {
474 	case CRYPTO_MD5_HMAC:
475 		return (16);
476 	case CRYPTO_SHA1_HMAC:
477 		return (20);
478 	case CRYPTO_RIPEMD160_HMAC:
479 		return (20);
480 	case CRYPTO_SHA2_256_HMAC:
481 		return (32);
482 	case CRYPTO_SHA2_384_HMAC:
483 		return (48);
484 	case CRYPTO_SHA2_512_HMAC:
485 		return (64);
486 	}
487 	return (0);
488 }
489 
490 #ifdef _KERNEL
491 int g_eli_read_metadata(struct g_class *mp, struct g_provider *pp,
492     struct g_eli_metadata *md);
493 struct g_geom *g_eli_create(struct gctl_req *req, struct g_class *mp,
494     struct g_provider *bpp, const struct g_eli_metadata *md,
495     const u_char *mkey, int nkey);
496 int g_eli_destroy(struct g_eli_softc *sc, boolean_t force);
497 
498 int g_eli_access(struct g_provider *pp, int dr, int dw, int de);
499 void g_eli_config(struct gctl_req *req, struct g_class *mp, const char *verb);
500 
501 void g_eli_read_done(struct bio *bp);
502 void g_eli_write_done(struct bio *bp);
503 int g_eli_crypto_rerun(struct cryptop *crp);
504 uint8_t *g_eli_crypto_key(struct g_eli_softc *sc, off_t offset,
505     size_t blocksize);
506 void g_eli_crypto_ivgen(struct g_eli_softc *sc, off_t offset, u_char *iv,
507     size_t size);
508 
509 void g_eli_crypto_read(struct g_eli_softc *sc, struct bio *bp, boolean_t fromworker);
510 void g_eli_crypto_run(struct g_eli_worker *wr, struct bio *bp);
511 
512 void g_eli_auth_read(struct g_eli_softc *sc, struct bio *bp);
513 void g_eli_auth_run(struct g_eli_worker *wr, struct bio *bp);
514 #endif
515 
516 void g_eli_mkey_hmac(unsigned char *mkey, const unsigned char *key);
517 int g_eli_mkey_decrypt(const struct g_eli_metadata *md,
518     const unsigned char *key, unsigned char *mkey, unsigned *nkeyp);
519 int g_eli_mkey_encrypt(unsigned algo, const unsigned char *key, unsigned keylen,
520     unsigned char *mkey);
521 #ifdef _KERNEL
522 void g_eli_mkey_propagate(struct g_eli_softc *sc, const unsigned char *mkey);
523 #endif
524 
525 int g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize,
526     const u_char *key, size_t keysize);
527 int g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize,
528     const u_char *key, size_t keysize);
529 
530 struct hmac_ctx {
531 	SHA512_CTX	shactx;
532 	u_char		k_opad[128];
533 };
534 
535 void g_eli_crypto_hmac_init(struct hmac_ctx *ctx, const uint8_t *hkey,
536     size_t hkeylen);
537 void g_eli_crypto_hmac_update(struct hmac_ctx *ctx, const uint8_t *data,
538     size_t datasize);
539 void g_eli_crypto_hmac_final(struct hmac_ctx *ctx, uint8_t *md, size_t mdsize);
540 void g_eli_crypto_hmac(const uint8_t *hkey, size_t hkeysize,
541     const uint8_t *data, size_t datasize, uint8_t *md, size_t mdsize);
542 #endif	/* !_G_ELI_H_ */
543