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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	sbin/isakmpd/crypto.c	Lines:	0	100	0.0 %
Date:	2017-11-13	Branches:	0	20	0.0 %


/* $OpenBSD: crypto.c,v 1.33 2015/12/09 21:41:50 naddy Exp $	 */
/* $EOM: crypto.c,v 1.32 2000/03/07 20:08:51 niklas Exp $	 */

/*
 * Copyright (c) 1998 Niels Provos.  All rights reserved.
 * Copyright (c) 1999, 2000 Niklas Hallqvist.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * This code was written under funding by Ericsson Radio Systems.
 */

#include <sys/types.h>
#include <stdlib.h>
#include <string.h>

#include "crypto.h"
#include "log.h"

enum cryptoerr  des3_init(struct keystate *, u_int8_t *, u_int16_t);
enum cryptoerr  blf_init(struct keystate *, u_int8_t *, u_int16_t);
enum cryptoerr  cast_init(struct keystate *, u_int8_t *, u_int16_t);
enum cryptoerr  aes_init(struct keystate *, u_int8_t *, u_int16_t);
void            des3_encrypt(struct keystate *, u_int8_t *, u_int16_t);
void            des3_decrypt(struct keystate *, u_int8_t *, u_int16_t);
void            blf_encrypt(struct keystate *, u_int8_t *, u_int16_t);
void            blf_decrypt(struct keystate *, u_int8_t *, u_int16_t);
void            cast1_encrypt(struct keystate *, u_int8_t *, u_int16_t);
void            cast1_decrypt(struct keystate *, u_int8_t *, u_int16_t);
void            aes_encrypt(struct keystate *, u_int8_t *, u_int16_t);
void            aes_decrypt(struct keystate *, u_int8_t *, u_int16_t);

struct crypto_xf transforms[] = {
	{
		TRIPLEDES_CBC, "Triple-DES (CBC-Mode)", 24, 24,
		BLOCKSIZE, 0,
		des3_init,
		des3_encrypt, des3_decrypt
	},
	{
		BLOWFISH_CBC, "Blowfish (CBC-Mode)", 12, 56,
		BLOCKSIZE, 0,
		blf_init,
		blf_encrypt, blf_decrypt
	},
	{
		CAST_CBC, "CAST (CBC-Mode)", 12, 16,
		BLOCKSIZE, 0,
		cast_init,
		cast1_encrypt, cast1_decrypt
	},
	{
		AES_CBC, "AES (CBC-Mode)", 16, 32,
		AES_BLOCK_SIZE, 0,
		aes_init,
		aes_encrypt, aes_decrypt
	},
};

enum cryptoerr
des3_init(struct keystate *ks, u_int8_t *key, u_int16_t len)
{
	DES_set_odd_parity((void *)key);
	DES_set_odd_parity((void *)(key + 8));
	DES_set_odd_parity((void *)(key + 16));

	/* As of the draft Tripe-DES does not check for weak keys */
	DES_set_key((void *)key, &ks->ks_des[0]);
	DES_set_key((void *)(key + 8), &ks->ks_des[1]);
	DES_set_key((void *)(key + 16), &ks->ks_des[2]);

	return EOKAY;
}

void
des3_encrypt(struct keystate *ks, u_int8_t *data, u_int16_t len)
{
	u_int8_t        iv[MAXBLK];

	memcpy(iv, ks->riv, ks->xf->blocksize);
	DES_ede3_cbc_encrypt((void *)data, (void *)data, len, &ks->ks_des[0],
	    &ks->ks_des[1], &ks->ks_des[2], (void *)iv, DES_ENCRYPT);
}

void
des3_decrypt(struct keystate *ks, u_int8_t *data, u_int16_t len)
{
	u_int8_t        iv[MAXBLK];

	memcpy(iv, ks->riv, ks->xf->blocksize);
	DES_ede3_cbc_encrypt((void *)data, (void *)data, len, &ks->ks_des[0],
	    &ks->ks_des[1], &ks->ks_des[2], (void *)iv, DES_DECRYPT);
}

enum cryptoerr
blf_init(struct keystate *ks, u_int8_t *key, u_int16_t len)
{
	blf_key(&ks->ks_blf, key, len);

	return EOKAY;
}

void
blf_encrypt(struct keystate *ks, u_int8_t *data, u_int16_t len)
{
	u_int16_t       i, blocksize = ks->xf->blocksize;
	u_int8_t       *iv = ks->liv;
	u_int32_t       xl, xr;

	memcpy(iv, ks->riv, blocksize);

	for (i = 0; i < len; data += blocksize, i += blocksize) {
		XOR64(data, iv);
		xl = GET_32BIT_BIG(data);
		xr = GET_32BIT_BIG(data + 4);
		Blowfish_encipher(&ks->ks_blf, &xl, &xr);
		SET_32BIT_BIG(data, xl);
		SET_32BIT_BIG(data + 4, xr);
		SET64(iv, data);
	}
}

void
blf_decrypt(struct keystate *ks, u_int8_t *data, u_int16_t len)
{
	u_int16_t       i, blocksize = ks->xf->blocksize;
	u_int32_t       xl, xr;

	data += len - blocksize;
	for (i = len - blocksize; i >= blocksize; data -= blocksize,
	    i -= blocksize) {
		xl = GET_32BIT_BIG(data);
		xr = GET_32BIT_BIG(data + 4);
		Blowfish_decipher(&ks->ks_blf, &xl, &xr);
		SET_32BIT_BIG(data, xl);
		SET_32BIT_BIG(data + 4, xr);
		XOR64(data, data - blocksize);

	}
	xl = GET_32BIT_BIG(data);
	xr = GET_32BIT_BIG(data + 4);
	Blowfish_decipher(&ks->ks_blf, &xl, &xr);
	SET_32BIT_BIG(data, xl);
	SET_32BIT_BIG(data + 4, xr);
	XOR64(data, ks->riv);
}

enum cryptoerr
cast_init(struct keystate *ks, u_int8_t *key, u_int16_t len)
{
	CAST_set_key(&ks->ks_cast, len, key);
	return EOKAY;
}

void
cast1_encrypt(struct keystate *ks, u_int8_t *data, u_int16_t len)
{
	memcpy(ks->liv, ks->riv, ks->xf->blocksize);
	CAST_cbc_encrypt(data, data, len, &ks->ks_cast, ks->liv, 1);
}

void
cast1_decrypt(struct keystate *ks, u_int8_t *data, u_int16_t len)
{
	CAST_cbc_encrypt(data, data, len, &ks->ks_cast, ks->riv, 0);
}

enum cryptoerr
aes_init(struct keystate *ks, u_int8_t *key, u_int16_t len)
{
	AES_set_encrypt_key(key, len << 3, &ks->ks_aes[0]);
	AES_set_decrypt_key(key, len << 3, &ks->ks_aes[1]);
	return EOKAY;
}

void
aes_encrypt(struct keystate *ks, u_int8_t *data, u_int16_t len)
{
	u_int8_t        iv[MAXBLK];

	memcpy(iv, ks->riv, ks->xf->blocksize);
	AES_cbc_encrypt(data, data, len, &ks->ks_aes[0], iv, AES_ENCRYPT);
}

void
aes_decrypt(struct keystate *ks, u_int8_t *data, u_int16_t len)
{
	u_int8_t        iv[MAXBLK];

	memcpy(iv, ks->riv, ks->xf->blocksize);
	AES_cbc_encrypt(data, data, len, &ks->ks_aes[1], iv, AES_DECRYPT);
}

struct crypto_xf *
crypto_get(enum transform id)
{
	size_t          i;

	for (i = 0; i < sizeof transforms / sizeof transforms[0]; i++)
		if (id == transforms[i].id)
			return &transforms[i];

	return 0;
}

struct keystate *
crypto_init(struct crypto_xf *xf, u_int8_t *key, u_int16_t len,
    enum cryptoerr *err)
{
	struct keystate *ks;

	if (len < xf->keymin || len > xf->keymax) {
		LOG_DBG((LOG_CRYPTO, 10, "crypto_init: invalid key length %d",
		    len));
		*err = EKEYLEN;
		return 0;
	}
	ks = calloc(1, sizeof *ks);
	if (!ks) {
		log_error("crypto_init: calloc (1, %lu) failed",
		    (unsigned long)sizeof *ks);
		*err = ENOCRYPTO;
		return 0;
	}
	ks->xf = xf;

	/* Setup the IV.  */
	ks->riv = ks->iv;
	ks->liv = ks->iv2;

	LOG_DBG_BUF((LOG_CRYPTO, 40, "crypto_init: key", key, len));

	*err = xf->init(ks, key, len);
	if (*err != EOKAY) {
		LOG_DBG((LOG_CRYPTO, 30, "crypto_init: weak key found for %s",
		    xf->name));
		free(ks);
		return 0;
	}
	return ks;
}

void
crypto_update_iv(struct keystate *ks)
{
	u_int8_t       *tmp;

	tmp = ks->riv;
	ks->riv = ks->liv;
	ks->liv = tmp;

	LOG_DBG_BUF((LOG_CRYPTO, 50, "crypto_update_iv: updated IV", ks->riv,
	    ks->xf->blocksize));
}

void
crypto_init_iv(struct keystate *ks, u_int8_t *buf, size_t len)
{
	memcpy(ks->riv, buf, len);

	LOG_DBG_BUF((LOG_CRYPTO, 50, "crypto_init_iv: initialized IV", ks->riv,
	    len));
}

void
crypto_encrypt(struct keystate *ks, u_int8_t *buf, u_int16_t len)
{
	LOG_DBG_BUF((LOG_CRYPTO, 70, "crypto_encrypt: before encryption", buf,
	    len));
	ks->xf->encrypt(ks, buf, len);
	memcpy(ks->liv, buf + len - ks->xf->blocksize, ks->xf->blocksize);
	LOG_DBG_BUF((LOG_CRYPTO, 70, "crypto_encrypt: after encryption", buf,
	    len));
}

void
crypto_decrypt(struct keystate *ks, u_int8_t *buf, u_int16_t len)
{
	LOG_DBG_BUF((LOG_CRYPTO, 70, "crypto_decrypt: before decryption", buf,
	    len));
	/*
	 * XXX There is controversy about the correctness of updating the IV
	 * like this.
         */
	memcpy(ks->liv, buf + len - ks->xf->blocksize, ks->xf->blocksize);
	ks->xf->decrypt(ks, buf, len);
	LOG_DBG_BUF((LOG_CRYPTO, 70, "crypto_decrypt: after decryption", buf,
	    len));
}

/* Make a copy of the keystate pointed to by OKS.  */
struct keystate *
crypto_clone_keystate(struct keystate *oks)
{
	struct keystate *ks;

	ks = malloc(sizeof *ks);
	if (!ks) {
		log_error("crypto_clone_keystate: malloc (%lu) failed",
		    (unsigned long)sizeof *ks);
		return 0;
	}
	memcpy(ks, oks, sizeof *ks);
	if (oks->riv == oks->iv) {
		ks->riv = ks->iv;
		ks->liv = ks->iv2;
	} else {
		ks->riv = ks->iv2;
		ks->liv = ks->iv;
	}
	return ks;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: crypto.c,v 1.33 2015/12/09 21:41:50 naddy Exp $ */
2			/* $EOM: crypto.c,v 1.32 2000/03/07 20:08:51 niklas Exp $ */
3
4			/*
5			* Copyright (c) 1998 Niels Provos. All rights reserved.
6			* Copyright (c) 1999, 2000 Niklas Hallqvist. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			* 1. Redistributions of source code must retain the above copyright
12			* notice, this list of conditions and the following disclaimer.
13			* 2. Redistributions in binary form must reproduce the above copyright
14			* notice, this list of conditions and the following disclaimer in the
15			* documentation and/or other materials provided with the distribution.
16			*
17			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20			* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23			* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24			* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26			* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27			*/
28
29			/*
30			* This code was written under funding by Ericsson Radio Systems.
31			*/
32
33			#include <sys/types.h>
34			#include <stdlib.h>
35			#include <string.h>
36
37			#include "crypto.h"
38			#include "log.h"
39
40			enum cryptoerr des3_init(struct keystate , u_int8_t , u_int16_t);
41			enum cryptoerr blf_init(struct keystate , u_int8_t , u_int16_t);
42			enum cryptoerr cast_init(struct keystate , u_int8_t , u_int16_t);
43			enum cryptoerr aes_init(struct keystate , u_int8_t , u_int16_t);
44			void des3_encrypt(struct keystate , u_int8_t , u_int16_t);
45			void des3_decrypt(struct keystate , u_int8_t , u_int16_t);
46			void blf_encrypt(struct keystate , u_int8_t , u_int16_t);
47			void blf_decrypt(struct keystate , u_int8_t , u_int16_t);
48			void cast1_encrypt(struct keystate , u_int8_t , u_int16_t);
49			void cast1_decrypt(struct keystate , u_int8_t , u_int16_t);
50			void aes_encrypt(struct keystate , u_int8_t , u_int16_t);
51			void aes_decrypt(struct keystate , u_int8_t , u_int16_t);
52
53			struct crypto_xf transforms[] = {
54			{
55			TRIPLEDES_CBC, "Triple-DES (CBC-Mode)", 24, 24,
56			BLOCKSIZE, 0,
57			des3_init,
58			des3_encrypt, des3_decrypt
59			},
60			{
61			BLOWFISH_CBC, "Blowfish (CBC-Mode)", 12, 56,
62			BLOCKSIZE, 0,
63			blf_init,
64			blf_encrypt, blf_decrypt
65			},
66			{
67			CAST_CBC, "CAST (CBC-Mode)", 12, 16,
68			BLOCKSIZE, 0,
69			cast_init,
70			cast1_encrypt, cast1_decrypt
71			},
72			{
73			AES_CBC, "AES (CBC-Mode)", 16, 32,
74			AES_BLOCK_SIZE, 0,
75			aes_init,
76			aes_encrypt, aes_decrypt
77			},
78			};
79
80			enum cryptoerr
81			des3_init(struct keystate ks, u_int8_t key, u_int16_t len)
82			{
83			DES_set_odd_parity((void *)key);
84			DES_set_odd_parity((void *)(key + 8));
85			DES_set_odd_parity((void *)(key + 16));
86
87			/* As of the draft Tripe-DES does not check for weak keys */
88			DES_set_key((void *)key, &ks->ks_des[0]);
89			DES_set_key((void *)(key + 8), &ks->ks_des[1]);
90			DES_set_key((void *)(key + 16), &ks->ks_des[2]);
91
92			return EOKAY;
93			}
94
95			void
96			des3_encrypt(struct keystate ks, u_int8_t data, u_int16_t len)
97			{
98			u_int8_t iv[MAXBLK];
99
100			memcpy(iv, ks->riv, ks->xf->blocksize);
101			DES_ede3_cbc_encrypt((void )data, (void )data, len, &ks->ks_des[0],
102			&ks->ks_des[1], &ks->ks_des[2], (void *)iv, DES_ENCRYPT);
103			}
104
105			void
106			des3_decrypt(struct keystate ks, u_int8_t data, u_int16_t len)
107			{
108			u_int8_t iv[MAXBLK];
109
110			memcpy(iv, ks->riv, ks->xf->blocksize);
111			DES_ede3_cbc_encrypt((void )data, (void )data, len, &ks->ks_des[0],
112			&ks->ks_des[1], &ks->ks_des[2], (void *)iv, DES_DECRYPT);
113			}
114
115			enum cryptoerr
116			blf_init(struct keystate ks, u_int8_t key, u_int16_t len)
117			{
118			blf_key(&ks->ks_blf, key, len);
119
120			return EOKAY;
121			}
122
123			void
124			blf_encrypt(struct keystate ks, u_int8_t data, u_int16_t len)
125			{
126			u_int16_t i, blocksize = ks->xf->blocksize;
127			u_int8_t *iv = ks->liv;
128			u_int32_t xl, xr;
129
130			memcpy(iv, ks->riv, blocksize);
131
132			for (i = 0; i < len; data += blocksize, i += blocksize) {
133			XOR64(data, iv);
134			xl = GET_32BIT_BIG(data);
135			xr = GET_32BIT_BIG(data + 4);
136			Blowfish_encipher(&ks->ks_blf, &xl, &xr);
137			SET_32BIT_BIG(data, xl);
138			SET_32BIT_BIG(data + 4, xr);
139			SET64(iv, data);
140			}
141			}
142
143			void
144			blf_decrypt(struct keystate ks, u_int8_t data, u_int16_t len)
145			{
146			u_int16_t i, blocksize = ks->xf->blocksize;
147			u_int32_t xl, xr;
148
149			data += len - blocksize;
150			for (i = len - blocksize; i >= blocksize; data -= blocksize,
151			i -= blocksize) {
152			xl = GET_32BIT_BIG(data);
153			xr = GET_32BIT_BIG(data + 4);
154			Blowfish_decipher(&ks->ks_blf, &xl, &xr);
155			SET_32BIT_BIG(data, xl);
156			SET_32BIT_BIG(data + 4, xr);
157			XOR64(data, data - blocksize);
158
159			}
160			xl = GET_32BIT_BIG(data);
161			xr = GET_32BIT_BIG(data + 4);
162			Blowfish_decipher(&ks->ks_blf, &xl, &xr);
163			SET_32BIT_BIG(data, xl);
164			SET_32BIT_BIG(data + 4, xr);
165			XOR64(data, ks->riv);
166			}
167
168			enum cryptoerr
169			cast_init(struct keystate ks, u_int8_t key, u_int16_t len)
170			{
171			CAST_set_key(&ks->ks_cast, len, key);
172			return EOKAY;
173			}
174
175			void
176			cast1_encrypt(struct keystate ks, u_int8_t data, u_int16_t len)
177			{
178			memcpy(ks->liv, ks->riv, ks->xf->blocksize);
179			CAST_cbc_encrypt(data, data, len, &ks->ks_cast, ks->liv, 1);
180			}
181
182			void
183			cast1_decrypt(struct keystate ks, u_int8_t data, u_int16_t len)
184			{
185			CAST_cbc_encrypt(data, data, len, &ks->ks_cast, ks->riv, 0);
186			}
187
188			enum cryptoerr
189			aes_init(struct keystate ks, u_int8_t key, u_int16_t len)
190			{
191			AES_set_encrypt_key(key, len << 3, &ks->ks_aes[0]);
192			AES_set_decrypt_key(key, len << 3, &ks->ks_aes[1]);
193			return EOKAY;
194			}
195
196			void
197			aes_encrypt(struct keystate ks, u_int8_t data, u_int16_t len)
198			{
199			u_int8_t iv[MAXBLK];
200
201			memcpy(iv, ks->riv, ks->xf->blocksize);
202			AES_cbc_encrypt(data, data, len, &ks->ks_aes[0], iv, AES_ENCRYPT);
203			}
204
205			void
206			aes_decrypt(struct keystate ks, u_int8_t data, u_int16_t len)
207			{
208			u_int8_t iv[MAXBLK];
209
210			memcpy(iv, ks->riv, ks->xf->blocksize);
211			AES_cbc_encrypt(data, data, len, &ks->ks_aes[1], iv, AES_DECRYPT);
212			}
213
214			struct crypto_xf *
215			crypto_get(enum transform id)
216			{
217			size_t i;
218
219			for (i = 0; i < sizeof transforms / sizeof transforms[0]; i++)
220			if (id == transforms[i].id)
221			return &transforms[i];
222
223			return 0;
224			}
225
226			struct keystate *
227			crypto_init(struct crypto_xf xf, u_int8_t key, u_int16_t len,
228			enum cryptoerr *err)
229			{
230			struct keystate *ks;
231
232			if (len < xf->keymin \|\| len > xf->keymax) {
233			LOG_DBG((LOG_CRYPTO, 10, "crypto_init: invalid key length %d",
234			len));
235			*err = EKEYLEN;
236			return 0;
237			}
238			ks = calloc(1, sizeof *ks);
239			if (!ks) {
240			log_error("crypto_init: calloc (1, %lu) failed",
241			(unsigned long)sizeof *ks);
242			*err = ENOCRYPTO;
243			return 0;
244			}
245			ks->xf = xf;
246
247			/* Setup the IV. */
248			ks->riv = ks->iv;
249			ks->liv = ks->iv2;
250
251			LOG_DBG_BUF((LOG_CRYPTO, 40, "crypto_init: key", key, len));
252
253			*err = xf->init(ks, key, len);
254			if (*err != EOKAY) {
255			LOG_DBG((LOG_CRYPTO, 30, "crypto_init: weak key found for %s",
256			xf->name));
257			free(ks);
258			return 0;
259			}
260			return ks;
261			}
262
263			void
264			crypto_update_iv(struct keystate *ks)
265			{
266			u_int8_t *tmp;
267
268			tmp = ks->riv;
269			ks->riv = ks->liv;
270			ks->liv = tmp;
271
272			LOG_DBG_BUF((LOG_CRYPTO, 50, "crypto_update_iv: updated IV", ks->riv,
273			ks->xf->blocksize));
274			}
275
276			void
277			crypto_init_iv(struct keystate ks, u_int8_t buf, size_t len)
278			{
279			memcpy(ks->riv, buf, len);
280
281			LOG_DBG_BUF((LOG_CRYPTO, 50, "crypto_init_iv: initialized IV", ks->riv,
282			len));
283			}
284
285			void
286			crypto_encrypt(struct keystate ks, u_int8_t buf, u_int16_t len)
287			{
288			LOG_DBG_BUF((LOG_CRYPTO, 70, "crypto_encrypt: before encryption", buf,
289			len));
290			ks->xf->encrypt(ks, buf, len);
291			memcpy(ks->liv, buf + len - ks->xf->blocksize, ks->xf->blocksize);
292			LOG_DBG_BUF((LOG_CRYPTO, 70, "crypto_encrypt: after encryption", buf,
293			len));
294			}
295
296			void
297			crypto_decrypt(struct keystate ks, u_int8_t buf, u_int16_t len)
298			{
299			LOG_DBG_BUF((LOG_CRYPTO, 70, "crypto_decrypt: before decryption", buf,
300			len));
301			/*
302			* XXX There is controversy about the correctness of updating the IV
303			* like this.
304			*/
305			memcpy(ks->liv, buf + len - ks->xf->blocksize, ks->xf->blocksize);
306			ks->xf->decrypt(ks, buf, len);
307			LOG_DBG_BUF((LOG_CRYPTO, 70, "crypto_decrypt: after decryption", buf,
308			len));
309			}
310
311			/* Make a copy of the keystate pointed to by OKS. */
312			struct keystate *
313			crypto_clone_keystate(struct keystate *oks)
314			{
315			struct keystate *ks;
316
317			ks = malloc(sizeof *ks);
318			if (!ks) {
319			log_error("crypto_clone_keystate: malloc (%lu) failed",
320			(unsigned long)sizeof *ks);
321			return 0;
322			}
323			memcpy(ks, oks, sizeof *ks);
324			if (oks->riv == oks->iv) {
325			ks->riv = ks->iv;
326			ks->liv = ks->iv2;
327			} else {
328			ks->riv = ks->iv2;
329			ks->liv = ks->iv;
330			}
331			return ks;
332			}