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217 lines
9.5 KiB
C++
217 lines
9.5 KiB
C++
/* crypto/idea/idea_lcl.h */
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/* Copyright (C) 1995-1998 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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/*
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* The new form of this macro (check if the a*b == 0) was suggested by Colin
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* Plumb <colin@nyx10.cs.du.edu>
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*/
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/* Removal of the inner if from from Wei Dai 24/4/96 */
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#define idea_mul(r,a,b,ul) \
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ul=(unsigned long)a*b; \
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if (ul != 0) \
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{ \
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r=(ul&0xffff)-(ul>>16); \
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r-=((r)>>16); \
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} \
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else \
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r=(-(int)a-b+1); /* assuming a or b is 0 and in range */
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#ifdef undef
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# define idea_mul(r,a,b,ul,sl) \
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if (a == 0) r=(0x10001-b)&0xffff; \
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else if (b == 0) r=(0x10001-a)&0xffff; \
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else { \
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ul=(unsigned long)a*b; \
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sl=(ul&0xffff)-(ul>>16); \
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if (sl <= 0) sl+=0x10001; \
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r=sl; \
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}
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#endif
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/*
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* 7/12/95 - Many thanks to Rhys Weatherley <rweather@us.oracle.com> for
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* pointing out that I was assuming little endian byte order for all
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* quantities what idea actually used bigendian. No where in the spec does
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* it mention this, it is all in terms of 16 bit numbers and even the example
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* does not use byte streams for the input example :-(. If you byte swap each
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* pair of input, keys and iv, the functions would produce the output as the
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* old version :-(.
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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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#undef s2n
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#define s2n(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8L)&0xff))
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#undef n2s
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#define n2s(c,l) (l =((IDEA_INT)(*((c)++)))<< 8L, \
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l|=((IDEA_INT)(*((c)++))) )
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#ifdef undef
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/* NOTE - c is not incremented as per c2l */
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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))))<<24; \
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case 7: l2|=((unsigned long)(*(--(c))))<<16; \
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case 6: l2|=((unsigned long)(*(--(c))))<< 8; \
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case 5: l2|=((unsigned long)(*(--(c)))); \
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case 4: l1 =((unsigned long)(*(--(c))))<<24; \
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case 3: l1|=((unsigned long)(*(--(c))))<<16; \
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case 2: l1|=((unsigned long)(*(--(c))))<< 8; \
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case 1: l1|=((unsigned long)(*(--(c)))); \
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} \
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}
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/* NOTE - c is not incremented as per l2c */
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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)>>24)&0xff); \
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case 7: *(--(c))=(unsigned char)(((l2)>>16)&0xff); \
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case 6: *(--(c))=(unsigned char)(((l2)>> 8)&0xff); \
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case 5: *(--(c))=(unsigned char)(((l2) )&0xff); \
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case 4: *(--(c))=(unsigned char)(((l1)>>24)&0xff); \
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case 3: *(--(c))=(unsigned char)(((l1)>>16)&0xff); \
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case 2: *(--(c))=(unsigned char)(((l1)>> 8)&0xff); \
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case 1: *(--(c))=(unsigned char)(((l1) )&0xff); \
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} \
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}
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# undef c2s
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# define c2s(c,l) (l =((unsigned long)(*((c)++))) , \
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l|=((unsigned long)(*((c)++)))<< 8L)
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# undef s2c
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# define s2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8L)&0xff))
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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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# 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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#endif
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#define E_IDEA(num) \
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x1&=0xffff; \
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idea_mul(x1,x1,*p,ul); p++; \
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x2+= *(p++); \
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x3+= *(p++); \
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x4&=0xffff; \
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idea_mul(x4,x4,*p,ul); p++; \
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t0=(x1^x3)&0xffff; \
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idea_mul(t0,t0,*p,ul); p++; \
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t1=(t0+(x2^x4))&0xffff; \
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idea_mul(t1,t1,*p,ul); p++; \
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t0+=t1; \
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x1^=t1; \
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x4^=t0; \
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ul=x2^t0; /* do the swap to x3 */ \
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x2=x3^t1; \
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x3=ul;
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