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/***********************************************************************
**
** Implementation of the Threefish-256 block cipher.
**
** Copyright (c) 2012, Michał Pałka
** All rights reserved
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** * The names of the authors may not be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
** WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
** DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
** DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
** (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
** ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
** SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**
**
** This code is extracted, with some simplifications, from the Skein
** team submission for the NIST SHA-3 competition. Original authorship is
** stated below.
**
**
************************************************************************
**
** Implementation of the Skein block functions.
**
** Source code author: Doug Whiting, 2008.
**
** This algorithm and source code is released to the public domain.
**
************************************************************************/
#include <string.h>
#include "threefish.h"
#ifndef SKEIN_LOOP
#define SKEIN_LOOP 001 /* default: unroll 256 and 512, but not 1024 */
#endif
#define BLK_BITS (WCNT*64) /* some useful definitions for code here */
#define KW_TWK_BASE (0)
#define KW_KEY_BASE (3)
#define ks (kw + KW_KEY_BASE)
#define ts (kw + KW_TWK_BASE)
#ifdef SKEIN_DEBUG
#define DebugSaveTweak(ctx) { ctx->h.T[0] = ts[0]; ctx->h.T[1] = ts[1]; }
#else
#define DebugSaveTweak(ctx)
#endif
void Threefish_256_Process_Block(const u08b_t *keyPtr, const u08b_t *blkPtr, u08b_t *cryptPtr, int w32out);
/* keyPtr, blkPtr and cryptPtr are all arrays of 4 64-bit unsingned ints in host-endian
* format, unless the w32out argument is non-zero, in which case cryptPtr is an array of
* 8 32-bit unsigned ints in host endian format. cryptPtr is the output array. The function
* runs the cipher on one block only and ignores the tweak (tweak values are all 0). */
void Threefish_256_Process_Block(const u08b_t *keyPtr, const u08b_t *blkPtr, u08b_t *cryptPtr, int w32out)
{ /* do it in C */
enum
{
WCNT = SKEIN_256_STATE_WORDS
};
#undef RCNT
#define RCNT (SKEIN_256_ROUNDS_TOTAL/8)
#ifdef SKEIN_LOOP /* configure how much to unroll the loop */
#define SKEIN_UNROLL_256 (((SKEIN_LOOP)/100)%10)
#else
#define SKEIN_UNROLL_256 (0)
#endif
#if SKEIN_UNROLL_256
#if (RCNT % SKEIN_UNROLL_256)
#error "Invalid SKEIN_UNROLL_256" /* sanity check on unroll count */
#endif
size_t r;
u64b_t kw[WCNT+4+RCNT*2]; /* key schedule words : chaining vars + tweak + "rotation"*/
#else
u64b_t kw[WCNT+4]; /* key schedule words : chaining vars + tweak */
#endif
u64b_t X0,X1,X2,X3; /* local copy of context vars, for speed */
u64b_t w [WCNT]; /* local copy of input block */
#ifdef SKEIN_DEBUG
const u64b_t *Xptr[4]; /* use for debugging (help compiler put Xn in registers) */
Xptr[0] = &X0; Xptr[1] = &X1; Xptr[2] = &X2; Xptr[3] = &X3;
#endif
/*Skein_assert(blkCnt != 0);*/ /* never call with blkCnt == 0! */
/* This is just adding the tweak
ts[0] = ctx->h.T[0];
ts[1] = ctx->h.T[1];*/
/* Unnatural shift because of a removed loop */
/* this implementation only supports 2**64 input bytes (no carry out here) */
/*ts[0] += byteCntAdd; another tweak? */ /* update processed length */
/* precompute the key schedule for this block */
/* get the key in little-endian format */
/*Skein_Get64_LSB_First(ks,keyPtr,4); */
ks[0] = ((u64b_t *) keyPtr)[0];
ks[1] = ((u64b_t *) (keyPtr + 8))[0];
ks[2] = ((u64b_t *) (keyPtr + 16))[0];
ks[3] = ((u64b_t *) (keyPtr + 24))[0];
/*ks[0] = ctx->X[0];
ks[1] = ctx->X[1];
ks[2] = ctx->X[2];
ks[3] = ctx->X[3];*/
ks[4] = ks[0] ^ ks[1] ^ ks[2] ^ ks[3] ^ SKEIN_KS_PARITY;
/*ts[2] = ts[0] ^ ts[1]*/;
ts[0] = 0;
ts[1] = 0;
ts[2] = 0;
/*Skein_Get64_LSB_First(w,blkPtr,WCNT);*/ /* get input block in little-endian format */
w[0] = ((u64b_t *) blkPtr)[0];
w[1] = ((u64b_t *) (blkPtr + 8))[0];
w[2] = ((u64b_t *) (blkPtr + 16))[0];
w[3] = ((u64b_t *) (blkPtr + 24))[0];
DebugSaveTweak(ctx);
Skein_Show_Block(BLK_BITS,&ctx->h,ctx->X,blkPtr,w,ks,ts);
X0 = w[0] + ks[0]; /* do the first full key injection */
X1 = w[1] + ks[1] + ts[0];
X2 = w[2] + ks[2] + ts[1];
X3 = w[3] + ks[3];
Skein_Show_R_Ptr(BLK_BITS,&ctx->h,SKEIN_RND_KEY_INITIAL,Xptr); /* show starting state values */
/*blkPtr += SKEIN_256_BLOCK_BYTES;*/
/* run the rounds */
#define Round256(p0,p1,p2,p3,ROT,rNum) \
X##p0 += X##p1; X##p1 = RotL_64(X##p1,ROT##_0); X##p1 ^= X##p0; \
X##p2 += X##p3; X##p3 = RotL_64(X##p3,ROT##_1); X##p3 ^= X##p2; \
#if SKEIN_UNROLL_256 == 0
#define R256(p0,p1,p2,p3,ROT,rNum) /* fully unrolled */ \
Round256(p0,p1,p2,p3,ROT,rNum) \
Skein_Show_R_Ptr(BLK_BITS,&ctx->h,rNum,Xptr);
#define I256(R) \
X0 += ks[((R)+1) % 5]; /* inject the key schedule value */ \
X1 += ks[((R)+2) % 5] + ts[((R)+1) % 3]; \
X2 += ks[((R)+3) % 5] + ts[((R)+2) % 3]; \
X3 += ks[((R)+4) % 5] + (R)+1; \
Skein_Show_R_Ptr(BLK_BITS,&ctx->h,SKEIN_RND_KEY_INJECT,Xptr);
#else /* looping version */
#define R256(p0,p1,p2,p3,ROT,rNum) \
Round256(p0,p1,p2,p3,ROT,rNum) \
Skein_Show_R_Ptr(BLK_BITS,&ctx->h,4*(r-1)+rNum,Xptr);
#define I256(R) \
X0 += ks[r+(R)+0]; /* inject the key schedule value */ \
X1 += ks[r+(R)+1] + ts[r+(R)+0]; \
X2 += ks[r+(R)+2] + ts[r+(R)+1]; \
X3 += ks[r+(R)+3] + r+(R) ; \
ks[r + (R)+4 ] = ks[r+(R)-1]; /* rotate key schedule */\
ts[r + (R)+2 ] = ts[r+(R)-1]; \
Skein_Show_R_Ptr(BLK_BITS,&ctx->h,SKEIN_RND_KEY_INJECT,Xptr);
for (r=1;r < 2*RCNT;r+=2*SKEIN_UNROLL_256) /* loop thru it */
#endif
{
#define R256_8_rounds(R) \
R256(0,1,2,3,R_256_0,8*(R) + 1); \
R256(0,3,2,1,R_256_1,8*(R) + 2); \
R256(0,1,2,3,R_256_2,8*(R) + 3); \
R256(0,3,2,1,R_256_3,8*(R) + 4); \
I256(2*(R)); \
R256(0,1,2,3,R_256_4,8*(R) + 5); \
R256(0,3,2,1,R_256_5,8*(R) + 6); \
R256(0,1,2,3,R_256_6,8*(R) + 7); \
R256(0,3,2,1,R_256_7,8*(R) + 8); \
I256(2*(R)+1);
R256_8_rounds( 0);
#define R256_Unroll_R(NN) ((SKEIN_UNROLL_256 == 0 && SKEIN_256_ROUNDS_TOTAL/8 > (NN)) || (SKEIN_UNROLL_256 > (NN)))
#if R256_Unroll_R( 1)
R256_8_rounds( 1);
#endif
#if R256_Unroll_R( 2)
R256_8_rounds( 2);
#endif
#if R256_Unroll_R( 3)
R256_8_rounds( 3);
#endif
#if R256_Unroll_R( 4)
R256_8_rounds( 4);
#endif
#if R256_Unroll_R( 5)
R256_8_rounds( 5);
#endif
#if R256_Unroll_R( 6)
R256_8_rounds( 6);
#endif
#if R256_Unroll_R( 7)
R256_8_rounds( 7);
#endif
#if R256_Unroll_R( 8)
R256_8_rounds( 8);
#endif
#if R256_Unroll_R( 9)
R256_8_rounds( 9);
#endif
#if R256_Unroll_R(10)
R256_8_rounds(10);
#endif
#if R256_Unroll_R(11)
R256_8_rounds(11);
#endif
#if R256_Unroll_R(12)
R256_8_rounds(12);
#endif
#if R256_Unroll_R(13)
R256_8_rounds(13);
#endif
#if R256_Unroll_R(14)
R256_8_rounds(14);
#endif
#if (SKEIN_UNROLL_256 > 14)
#error "need more unrolling in Skein_256_Process_Block"
#endif
}
/* do the final "feedforward" xor, update context chaining vars */
/*ctx->X[0] = X0 ^ w[0];
ctx->X[1] = X1 ^ w[1];
ctx->X[2] = X2 ^ w[2];
ctx->X[3] = X3 ^ w[3];*/
if (w32out) {
((u32b_t *) cryptPtr) [0] = X0 >> 32;
((u32b_t *) (cryptPtr + 4)) [0] = X0;
((u32b_t *) (cryptPtr + 8)) [0] = X1 >> 32;
((u32b_t *) (cryptPtr + 12))[0] = X1;
((u32b_t *) (cryptPtr + 16))[0] = X2 >> 32;
((u32b_t *) (cryptPtr + 20))[0] = X2;
((u32b_t *) (cryptPtr + 24))[0] = X3 >> 32;
((u32b_t *) (cryptPtr + 28))[0] = X3;
} else {
((u64b_t *) cryptPtr) [0] = X0;
((u64b_t *) (cryptPtr + 8)) [0] = X1;
((u64b_t *) (cryptPtr + 16))[0] = X2;
((u64b_t *) (cryptPtr + 24))[0] = X3;
}
Skein_Show_Round(BLK_BITS,&ctx->h,SKEIN_RND_FEED_FWD,ctx->X);
/*ts[1] &= ~SKEIN_T1_FLAG_FIRST;*/
}
#if defined(SKEIN_CODE_SIZE) || defined(SKEIN_PERF)
size_t Threefish_256_Process_Block_CodeSize(void)
{
return ((u08b_t *) Threefish_256_Process_Block_CodeSize) -
((u08b_t *) Threefish_256_Process_Block_Block);
}
uint_t Threefish_256_Unroll_Cnt(void)
{
return SKEIN_UNROLL_256;
}
#endif
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