b10a0accee
The functions encrypt, setkey, encrypt_r, setkey_r, cbc_crypt, ecb_crypt, and des_setparity should not be used in new programs, because they use the DES block cipher, which is unacceptably weak by modern standards. Demote all of them to compatibility symbols, and remove their prototypes from installed headers. cbc_crypt, ecb_crypt, and des_setparity were already compat symbols when glibc was configured with --disable-obsolete-rpc. POSIX requires encrypt and setkey to be available when _XOPEN_CRYPT is defined, so this change also removes the definition of X_OPEN_CRYPT from <unistd.h>. The entire "DES Encryption" section is dropped from the manual, as is the mention of AUTH_DES and FIPS 140-2 in the introduction to crypt.texi. The documentation of 'memfrob' cross-referenced the DES Encryption section, which is replaced by a hyperlink to libgcrypt, and while I was in there I spruced up the actual documentation of 'memfrob' and 'strfry' a little. It's still fairly jokey, because those functions _are_ jokes, but they do also have real use cases, so people trying to use them for real should have all the information they need. DES-based authentication for Sun RPC is also insecure and should be deprecated or even removed, but maybe that can be left as TI-RPC's problem.
122 lines
3.6 KiB
C
122 lines
3.6 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 <shlib-compat.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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/* Note: these cannot be excluded from the build yet, because they are
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still used internally. */
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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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hidden_nolink (cbc_crypt, libc, GLIBC_2_1)
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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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hidden_nolink (ecb_crypt, libc, GLIBC_2_1)
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