333 lines
8.7 KiB
C
333 lines
8.7 KiB
C
/* $OpenBSD: crypto.c,v 1.35 2018/01/15 09:54:48 mpi 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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*
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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/types.h>
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#include <stdlib.h>
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#include <string.h>
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#include "crypto.h"
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#include "log.h"
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enum cryptoerr des3_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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enum cryptoerr aes_init(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 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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void aes_encrypt(struct keystate *, u_int8_t *, u_int16_t);
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void aes_decrypt(struct keystate *, u_int8_t *, u_int16_t);
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struct crypto_xf transforms[] = {
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{
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TRIPLEDES_CBC, "Triple-DES (CBC-Mode)", 24, 24,
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BLOCKSIZE, 0,
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des3_init,
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des3_encrypt, des3_decrypt
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},
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{
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BLOWFISH_CBC, "Blowfish (CBC-Mode)", 12, 56,
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BLOCKSIZE, 0,
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blf_init,
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blf_encrypt, blf_decrypt
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},
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{
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CAST_CBC, "CAST (CBC-Mode)", 12, 16,
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BLOCKSIZE, 0,
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cast_init,
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cast1_encrypt, cast1_decrypt
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},
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{
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AES_CBC, "AES (CBC-Mode)", 16, 32,
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AES_BLOCK_SIZE, 0,
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aes_init,
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aes_encrypt, aes_decrypt
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},
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};
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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((void *)key);
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DES_set_odd_parity((void *)(key + 8));
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DES_set_odd_parity((void *)(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((void *)key, &ks->ks_des[0]);
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DES_set_key((void *)(key + 8), &ks->ks_des[1]);
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DES_set_key((void *)(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((void *)data, (void *)data, len, &ks->ks_des[0],
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&ks->ks_des[1], &ks->ks_des[2], (void *)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((void *)data, (void *)data, len, &ks->ks_des[0],
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&ks->ks_des[1], &ks->ks_des[2], (void *)iv, DES_DECRYPT);
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}
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enum cryptoerr
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blf_init(struct keystate *ks, u_int8_t *key, u_int16_t len)
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{
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blf_key(&ks->ks_blf, key, len);
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return EOKAY;
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}
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void
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blf_encrypt(struct keystate *ks, u_int8_t *data, u_int16_t len)
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{
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u_int16_t i, blocksize = ks->xf->blocksize;
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u_int8_t *iv = ks->liv;
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u_int32_t xl, xr;
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memcpy(iv, ks->riv, blocksize);
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for (i = 0; i < len; data += blocksize, i += blocksize) {
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XOR64(data, iv);
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xl = GET_32BIT_BIG(data);
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xr = GET_32BIT_BIG(data + 4);
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Blowfish_encipher(&ks->ks_blf, &xl, &xr);
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SET_32BIT_BIG(data, xl);
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SET_32BIT_BIG(data + 4, xr);
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SET64(iv, data);
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}
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}
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void
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blf_decrypt(struct keystate *ks, u_int8_t *data, u_int16_t len)
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{
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u_int16_t i, blocksize = ks->xf->blocksize;
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u_int32_t xl, xr;
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data += len - blocksize;
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for (i = len - blocksize; i >= blocksize; data -= blocksize,
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i -= blocksize) {
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xl = GET_32BIT_BIG(data);
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xr = GET_32BIT_BIG(data + 4);
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Blowfish_decipher(&ks->ks_blf, &xl, &xr);
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SET_32BIT_BIG(data, xl);
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SET_32BIT_BIG(data + 4, xr);
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XOR64(data, data - blocksize);
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}
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xl = GET_32BIT_BIG(data);
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xr = GET_32BIT_BIG(data + 4);
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Blowfish_decipher(&ks->ks_blf, &xl, &xr);
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SET_32BIT_BIG(data, xl);
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SET_32BIT_BIG(data + 4, xr);
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XOR64(data, ks->riv);
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}
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enum cryptoerr
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cast_init(struct keystate *ks, u_int8_t *key, u_int16_t len)
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{
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CAST_set_key(&ks->ks_cast, len, key);
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return EOKAY;
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}
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void
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cast1_encrypt(struct keystate *ks, u_int8_t *data, u_int16_t len)
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{
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memcpy(ks->liv, ks->riv, ks->xf->blocksize);
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CAST_cbc_encrypt(data, data, len, &ks->ks_cast, ks->liv, 1);
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}
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void
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cast1_decrypt(struct keystate *ks, u_int8_t *data, u_int16_t len)
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{
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CAST_cbc_encrypt(data, data, len, &ks->ks_cast, ks->riv, 0);
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}
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enum cryptoerr
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aes_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, len << 3, &ks->ks_aes[0]);
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AES_set_decrypt_key(key, len << 3, &ks->ks_aes[1]);
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return EOKAY;
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}
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void
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aes_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(data, data, len, &ks->ks_aes[0], iv, AES_ENCRYPT);
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}
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void
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aes_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(data, data, len, &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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size_t 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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LOG_DBG((LOG_CRYPTO, 10, "crypto_init: invalid key length %d",
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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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log_error("crypto_init: calloc (1, %lu) failed",
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(unsigned long)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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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_init_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, 70, "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, 70, "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, 70, "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, 70, "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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log_error("crypto_clone_keystate: malloc (%lu) failed",
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(unsigned long)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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ks->riv = ks->iv;
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ks->liv = ks->iv2;
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} else {
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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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