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118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/*
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* des_crypt.c, DES encryption library routines
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* Copyright (c) 2010, Oracle America, Inc.
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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 are
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* met:
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*
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* * 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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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the "Oracle America, Inc." nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <rpc/des_crypt.h>
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#include "des.h"
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extern int _des_crypt (char *, unsigned, struct desparams *);
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/*
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* Copy 8 bytes
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*/
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#define COPY8(src, dst) { \
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register char *a = (char *) dst; \
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register char *b = (char *) src; \
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*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
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*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
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}
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/*
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* Copy multiple of 8 bytes
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*/
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#define DESCOPY(src, dst, len) { \
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register char *a = (char *) dst; \
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register char *b = (char *) src; \
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register int i; \
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for (i = (int) len; i > 0; i -= 8) { \
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*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
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*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
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} \
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}
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/*
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* Common code to cbc_crypt() & ecb_crypt()
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*/
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static int
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common_crypt (char *key, char *buf, register unsigned len,
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unsigned mode, register struct desparams *desp)
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{
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register int desdev;
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if ((len % 8) != 0 || len > DES_MAXDATA)
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return DESERR_BADPARAM;
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desp->des_dir =
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((mode & DES_DIRMASK) == DES_ENCRYPT) ? ENCRYPT : DECRYPT;
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desdev = mode & DES_DEVMASK;
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COPY8 (key, desp->des_key);
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/*
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* software
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*/
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if (!_des_crypt (buf, len, desp))
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return DESERR_HWERROR;
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return desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE;
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}
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/*
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* CBC mode encryption
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*/
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int
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cbc_crypt (char *key, char *buf, unsigned int len, unsigned int mode,
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char *ivec)
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{
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int err;
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struct desparams dp;
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dp.des_mode = CBC;
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COPY8 (ivec, dp.des_ivec);
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err = common_crypt (key, buf, len, mode, &dp);
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COPY8 (dp.des_ivec, ivec);
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return err;
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}
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libc_hidden_def (cbc_crypt)
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/*
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* ECB mode encryption
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*/
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int
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ecb_crypt (char *key, char *buf, unsigned int len, unsigned int mode)
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{
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struct desparams dp;
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dp.des_mode = ECB;
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return common_crypt (key, buf, len, mode, &dp);
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}
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libc_hidden_def (ecb_crypt)
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