307 lines
8.4 KiB
C
307 lines
8.4 KiB
C
/* $Id: crypto.c,v 1.4 2007/03/21 20:02:56 bew Exp $ */
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/* $Source: /nfs/cscbz/gdoi/gdoicvs/gdoi/src/crypto.c,v $ */
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/* $OpenBSD: crypto.c,v 1.11 2001/02/24 04:42:48 angelos Exp $ */
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/* $EOM: crypto.c,v 1.32 2000/03/07 20:08:51 niklas Exp $ */
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/*
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* Copyright (c) 1998 Niels Provos. All rights reserved.
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* Copyright (c) 1999, 2000 Niklas Hallqvist. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Ericsson Radio Systems.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This code was written under funding by Ericsson Radio Systems.
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*/
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#include <sys/param.h>
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#include <stdlib.h>
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#include <string.h>
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#include "sysdep.h"
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#include "crypto.h"
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#include "log.h"
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enum cryptoerr des1_init (struct keystate *, u_int8_t *, u_int16_t);
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enum cryptoerr des3_init (struct keystate *, u_int8_t *, u_int16_t);
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enum cryptoerr aes128_init (struct keystate *, u_int8_t *, u_int16_t);
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enum cryptoerr blf_init (struct keystate *, u_int8_t *, u_int16_t);
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enum cryptoerr cast_init (struct keystate *, u_int8_t *, u_int16_t);
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void des1_encrypt (struct keystate *, u_int8_t *, u_int16_t);
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void des1_decrypt (struct keystate *, u_int8_t *, u_int16_t);
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void des3_encrypt (struct keystate *, u_int8_t *, u_int16_t);
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void des3_decrypt (struct keystate *, u_int8_t *, u_int16_t);
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void aes128_encrypt (struct keystate *, u_int8_t *, u_int16_t);
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void aes128_decrypt (struct keystate *, u_int8_t *, u_int16_t);
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void blf_encrypt (struct keystate *, u_int8_t *, u_int16_t);
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void blf_decrypt (struct keystate *, u_int8_t *, u_int16_t);
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void cast1_encrypt (struct keystate *, u_int8_t *, u_int16_t);
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void cast1_decrypt (struct keystate *, u_int8_t *, u_int16_t);
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struct crypto_xf transforms[] = {
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#ifdef USE_DES
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{
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DES_CBC, "Data Encryption Standard (CBC-Mode)", 8, 8, BLOCKSIZE, 0,
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des1_init,
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des1_encrypt, des1_decrypt
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},
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#endif
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#ifdef USE_TRIPLEDES
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{
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TRIPLEDES_CBC, "Triple-DES (CBC-Mode)", 24, 24, BLOCKSIZE, 0,
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des3_init,
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des3_encrypt, des3_decrypt
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},
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#endif
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{
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AES_CBC_128, "128-bit AES (CBC-Mode)", 16, 16, AES128_BLOCKSIZE, 0,
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aes128_init,
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aes128_encrypt, aes128_decrypt
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},
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};
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#define DC (void *)
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enum cryptoerr
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des1_init (struct keystate *ks, u_int8_t *key, u_int16_t len)
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{
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/* des_set_key returns -1 for parity problems, and -2 for weak keys */
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des_set_odd_parity (DC key);
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switch (des_set_key (DC key, ks->ks_des[0]))
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{
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case -2:
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return EWEAKKEY;
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default:
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return EOKAY;
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}
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}
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void
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des1_encrypt (struct keystate *ks, u_int8_t *d, u_int16_t len)
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{
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des_cbc_encrypt (DC d, DC d, len, ks->ks_des[0], DC ks->riv, DES_ENCRYPT);
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}
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void
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des1_decrypt (struct keystate *ks, u_int8_t *d, u_int16_t len)
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{
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des_cbc_encrypt (DC d, DC d, len, ks->ks_des[0], DC ks->riv, DES_DECRYPT);
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}
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#ifdef USE_TRIPLEDES
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enum cryptoerr
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des3_init (struct keystate *ks, u_int8_t *key, u_int16_t len)
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{
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des_set_odd_parity (DC key);
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des_set_odd_parity (DC (key + 8));
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des_set_odd_parity (DC (key + 16));
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/* As of the draft Tripe-DES does not check for weak keys */
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des_set_key (DC key, ks->ks_des[0]);
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des_set_key (DC (key + 8), ks->ks_des[1]);
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des_set_key (DC (key + 16), ks->ks_des[2]);
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return EOKAY;
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}
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void
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des3_encrypt (struct keystate *ks, u_int8_t *data, u_int16_t len)
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{
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u_int8_t iv[MAXBLK];
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memcpy (iv, ks->riv, ks->xf->blocksize);
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des_ede3_cbc_encrypt (DC data, DC data, len, ks->ks_des[0], ks->ks_des[1],
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ks->ks_des[2], DC iv, DES_ENCRYPT);
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}
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void
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des3_decrypt (struct keystate *ks, u_int8_t *data, u_int16_t len)
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{
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u_int8_t iv[MAXBLK];
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memcpy (iv, ks->riv, ks->xf->blocksize);
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des_ede3_cbc_encrypt (DC data, DC data, len, ks->ks_des[0], ks->ks_des[1],
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ks->ks_des[2], DC iv, DES_DECRYPT);
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}
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#undef DC
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#endif /* USE_TRIPLEDES */
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enum cryptoerr
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aes128_init (struct keystate *ks, u_int8_t *key, u_int16_t len)
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{
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AES_set_encrypt_key(key, 128, &ks->ks_aes[0]);
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AES_set_decrypt_key(key, 128, &ks->ks_aes[1]);
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return EOKAY;
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}
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void
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aes128_encrypt (struct keystate *ks, u_int8_t *data, u_int16_t len)
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{
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u_int8_t iv[MAXBLK];
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memcpy (iv, ks->riv, ks->xf->blocksize);
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AES_cbc_encrypt((unsigned char *) data, (unsigned char *) data, len,
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&ks->ks_aes[0], iv, AES_ENCRYPT);
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}
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void
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aes128_decrypt (struct keystate *ks, u_int8_t *data, u_int16_t len)
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{
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u_int8_t iv[MAXBLK];
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memcpy (iv, ks->riv, ks->xf->blocksize);
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AES_cbc_encrypt((unsigned char *) data, (unsigned char *) data, len,
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&ks->ks_aes[1], iv, AES_DECRYPT);
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}
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struct crypto_xf *
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crypto_get (enum transform id)
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{
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int i;
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for (i = 0; i < sizeof transforms / sizeof transforms[0]; i++)
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if (id == transforms[i].id)
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return &transforms[i];
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return 0;
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}
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struct keystate *
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crypto_init (struct crypto_xf *xf, u_int8_t *key, u_int16_t len,
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enum cryptoerr *err)
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{
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struct keystate *ks;
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if (len < xf->keymin || len > xf->keymax)
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{
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LOG_DBG ((LOG_CRYPTO, 10, "crypto_init: invalid key length %d", len));
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*err = EKEYLEN;
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return 0;
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}
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ks = calloc (1, sizeof *ks);
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if (!ks)
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{
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log_error ("crypto_init: calloc (1, %d) failed", sizeof *ks);
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*err = ENOCRYPTO;
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return 0;
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}
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ks->xf = xf;
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/* Setup the IV. */
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ks->riv = ks->iv;
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ks->liv = ks->iv2;
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LOG_DBG_BUF ((LOG_CRYPTO, 40, "crypto_init: key", key, len));
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*err = xf->init (ks, key, len);
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if (*err != EOKAY)
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{
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LOG_DBG ((LOG_CRYPTO, 30, "crypto_init: weak key found for %s",
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xf->name));
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free (ks);
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return 0;
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}
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return ks;
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}
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void
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crypto_update_iv (struct keystate *ks)
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{
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u_int8_t *tmp;
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tmp = ks->riv;
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ks->riv = ks->liv;
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ks->liv = tmp;
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LOG_DBG_BUF ((LOG_CRYPTO, 50, "crypto_update_iv: updated IV", ks->riv,
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ks->xf->blocksize));
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}
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void
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crypto_init_iv (struct keystate *ks, u_int8_t *buf, size_t len)
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{
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memcpy (ks->riv, buf, len);
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LOG_DBG_BUF ((LOG_CRYPTO, 50, "crypto_update_iv: initialized IV", ks->riv,
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len));
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}
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void
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crypto_encrypt (struct keystate *ks, u_int8_t *buf, u_int16_t len)
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{
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LOG_DBG_BUF ((LOG_CRYPTO, 10, "crypto_encrypt: before encryption", buf,
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len));
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ks->xf->encrypt (ks, buf, len);
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memcpy (ks->liv, buf + len - ks->xf->blocksize, ks->xf->blocksize);
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LOG_DBG_BUF ((LOG_CRYPTO, 30, "crypto_encrypt: after encryption", buf,
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len));
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}
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void
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crypto_decrypt (struct keystate *ks, u_int8_t *buf, u_int16_t len)
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{
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LOG_DBG_BUF ((LOG_CRYPTO, 10, "crypto_decrypt: before decryption", buf,
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len));
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/*
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* XXX There is controversy about the correctness of updating the IV
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* like this.
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*/
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memcpy (ks->liv, buf + len - ks->xf->blocksize, ks->xf->blocksize);
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ks->xf->decrypt (ks, buf, len);;
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LOG_DBG_BUF ((LOG_CRYPTO, 30, "crypto_decrypt: after decryption", buf,
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len));
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}
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/* Make a copy of the keystate pointed to by OKS. */
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struct keystate *
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crypto_clone_keystate (struct keystate *oks)
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{
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struct keystate *ks;
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ks = malloc (sizeof *ks);
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if (!ks)
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{
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log_error ("crypto_clone_keystate: malloc (%d) failed", sizeof *ks);
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return 0;
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}
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memcpy (ks, oks, sizeof *ks);
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if (oks->riv == oks->iv)
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{
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ks->riv = ks->iv;
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ks->liv = ks->iv2;
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}
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else
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{
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ks->riv = ks->iv2;
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ks->liv = ks->iv;
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}
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return ks;
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}
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