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220 lines
8.6 KiB
C
220 lines
8.6 KiB
C
/* crypto/bf/bf_locl.h */
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/* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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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 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 cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#ifndef HEADER_BF_LOCL_H
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#define HEADER_BF_LOCL_H
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#include <openssl/opensslconf.h> /* BF_PTR, BF_PTR2 */
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#undef c2l
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#define c2l(c,l) (l =((unsigned long)(*((c)++))) , \
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l|=((unsigned long)(*((c)++)))<< 8L, \
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l|=((unsigned long)(*((c)++)))<<16L, \
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l|=((unsigned long)(*((c)++)))<<24L)
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/* NOTE - c is not incremented as per c2l */
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#undef c2ln
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#define c2ln(c,l1,l2,n) { \
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c+=n; \
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l1=l2=0; \
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switch (n) { \
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case 8: l2 =((unsigned long)(*(--(c))))<<24L; \
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case 7: l2|=((unsigned long)(*(--(c))))<<16L; \
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case 6: l2|=((unsigned long)(*(--(c))))<< 8L; \
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case 5: l2|=((unsigned long)(*(--(c)))); \
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case 4: l1 =((unsigned long)(*(--(c))))<<24L; \
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case 3: l1|=((unsigned long)(*(--(c))))<<16L; \
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case 2: l1|=((unsigned long)(*(--(c))))<< 8L; \
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case 1: l1|=((unsigned long)(*(--(c)))); \
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} \
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}
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#undef l2c
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#define l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
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*((c)++)=(unsigned char)(((l)>>16L)&0xff), \
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*((c)++)=(unsigned char)(((l)>>24L)&0xff))
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/* NOTE - c is not incremented as per l2c */
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#undef l2cn
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#define l2cn(l1,l2,c,n) { \
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c+=n; \
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switch (n) { \
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case 8: *(--(c))=(unsigned char)(((l2)>>24L)&0xff); \
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case 7: *(--(c))=(unsigned char)(((l2)>>16L)&0xff); \
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case 6: *(--(c))=(unsigned char)(((l2)>> 8L)&0xff); \
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case 5: *(--(c))=(unsigned char)(((l2) )&0xff); \
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case 4: *(--(c))=(unsigned char)(((l1)>>24L)&0xff); \
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case 3: *(--(c))=(unsigned char)(((l1)>>16L)&0xff); \
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case 2: *(--(c))=(unsigned char)(((l1)>> 8L)&0xff); \
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case 1: *(--(c))=(unsigned char)(((l1) )&0xff); \
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} \
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}
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/* NOTE - c is not incremented as per n2l */
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#define n2ln(c,l1,l2,n) { \
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c+=n; \
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l1=l2=0; \
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switch (n) { \
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case 8: l2 =((unsigned long)(*(--(c)))) ; \
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case 7: l2|=((unsigned long)(*(--(c))))<< 8; \
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case 6: l2|=((unsigned long)(*(--(c))))<<16; \
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case 5: l2|=((unsigned long)(*(--(c))))<<24; \
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case 4: l1 =((unsigned long)(*(--(c)))) ; \
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case 3: l1|=((unsigned long)(*(--(c))))<< 8; \
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case 2: l1|=((unsigned long)(*(--(c))))<<16; \
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case 1: l1|=((unsigned long)(*(--(c))))<<24; \
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} \
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}
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/* NOTE - c is not incremented as per l2n */
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#define l2nn(l1,l2,c,n) { \
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c+=n; \
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switch (n) { \
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case 8: *(--(c))=(unsigned char)(((l2) )&0xff); \
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case 7: *(--(c))=(unsigned char)(((l2)>> 8)&0xff); \
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case 6: *(--(c))=(unsigned char)(((l2)>>16)&0xff); \
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case 5: *(--(c))=(unsigned char)(((l2)>>24)&0xff); \
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case 4: *(--(c))=(unsigned char)(((l1) )&0xff); \
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case 3: *(--(c))=(unsigned char)(((l1)>> 8)&0xff); \
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case 2: *(--(c))=(unsigned char)(((l1)>>16)&0xff); \
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case 1: *(--(c))=(unsigned char)(((l1)>>24)&0xff); \
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} \
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}
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#undef n2l
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#define n2l(c,l) (l =((unsigned long)(*((c)++)))<<24L, \
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l|=((unsigned long)(*((c)++)))<<16L, \
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l|=((unsigned long)(*((c)++)))<< 8L, \
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l|=((unsigned long)(*((c)++))))
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#undef l2n
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#define l2n(l,c) (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
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*((c)++)=(unsigned char)(((l)>>16L)&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
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*((c)++)=(unsigned char)(((l) )&0xff))
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/* This is actually a big endian algorithm, the most significant byte
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* is used to lookup array 0 */
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#if defined(BF_PTR2)
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/*
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* This is basically a special Intel version. Point is that Intel
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* doesn't have many registers, but offers a reach choice of addressing
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* modes. So we spare some registers by directly traversing BF_KEY
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* structure and hiring the most decorated addressing mode. The code
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* generated by EGCS is *perfectly* competitive with assembler
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* implementation!
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*/
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#define BF_ENC(LL,R,KEY,Pi) (\
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LL^=KEY[Pi], \
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t= KEY[BF_ROUNDS+2 + 0 + ((R>>24)&0xFF)], \
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t+= KEY[BF_ROUNDS+2 + 256 + ((R>>16)&0xFF)], \
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t^= KEY[BF_ROUNDS+2 + 512 + ((R>>8 )&0xFF)], \
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t+= KEY[BF_ROUNDS+2 + 768 + ((R )&0xFF)], \
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LL^=t \
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)
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#elif defined(BF_PTR)
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#ifndef BF_LONG_LOG2
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#define BF_LONG_LOG2 2 /* default to BF_LONG being 32 bits */
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#endif
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#define BF_M (0xFF<<BF_LONG_LOG2)
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#define BF_0 (24-BF_LONG_LOG2)
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#define BF_1 (16-BF_LONG_LOG2)
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#define BF_2 ( 8-BF_LONG_LOG2)
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#define BF_3 BF_LONG_LOG2 /* left shift */
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/*
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* This is normally very good on RISC platforms where normally you
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* have to explicitly "multiply" array index by sizeof(BF_LONG)
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* in order to calculate the effective address. This implementation
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* excuses CPU from this extra work. Power[PC] uses should have most
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* fun as (R>>BF_i)&BF_M gets folded into a single instruction, namely
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* rlwinm. So let'em double-check if their compiler does it.
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*/
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#define BF_ENC(LL,R,S,P) ( \
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LL^=P, \
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LL^= (((*(BF_LONG *)((unsigned char *)&(S[ 0])+((R>>BF_0)&BF_M))+ \
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*(BF_LONG *)((unsigned char *)&(S[256])+((R>>BF_1)&BF_M)))^ \
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*(BF_LONG *)((unsigned char *)&(S[512])+((R>>BF_2)&BF_M)))+ \
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*(BF_LONG *)((unsigned char *)&(S[768])+((R<<BF_3)&BF_M))) \
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)
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#else
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/*
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* This is a *generic* version. Seem to perform best on platforms that
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* offer explicit support for extraction of 8-bit nibbles preferably
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* complemented with "multiplying" of array index by sizeof(BF_LONG).
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* For the moment of this writing the list comprises Alpha CPU featuring
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* extbl and s[48]addq instructions.
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*/
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#define BF_ENC(LL,R,S,P) ( \
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LL^=P, \
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LL^=((( S[ ((int)(R>>24)&0xff)] + \
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S[0x0100+((int)(R>>16)&0xff)])^ \
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S[0x0200+((int)(R>> 8)&0xff)])+ \
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S[0x0300+((int)(R )&0xff)])&0xffffffffL \
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)
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#endif
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#endif
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