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skein.c
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skein.c
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/***********************************************************************
**
** Implementation of the Skein hash function.
**
** Source code author: Doug Whiting, 2008.
**
** This algorithm and source code is released to the public domain.
**
** streamlining: Daniel J. Bernstein
************************************************************************/
#include <stddef.h> /* size_t */
#include <string.h> /* memcpy, memset */
#include <stdint.h>
#include "sha2.h"
typedef uint8_t uint8;
typedef uint64_t uint64;
#define MK_64(hi32,lo32) ((lo32) + (((uint64) (hi32)) << 32))
#define RotL_64(x,N) (((x) << (N)) | ((x) >> (64-(N))))
#define SKEIN_VERSION (1)
#define SKEIN_ID_STRING_LE (0x33414853)
#define SKEIN_SCHEMA_VER MK_64(SKEIN_VERSION,SKEIN_ID_STRING_LE)
#define SKEIN_KS_PARITY MK_64(0x1BD11BDA,0xA9FC1A22)
static const uint64 IV[] = {
MK_64(0x4903ADFF,0x749C51CE),
MK_64(0x0D95DE39,0x9746DF03),
MK_64(0x8FD19341,0x27C79BCE),
MK_64(0x9A255629,0xFF352CB1),
MK_64(0x5DB62599,0xDF6CA7B0),
MK_64(0xEABE394C,0xA9D5C3F4),
MK_64(0x991112C7,0x1A75B523),
MK_64(0xAE18A40B,0x660FCC33)
};
static void Skein_Get64_LSB_First(uint64 *dst,const uint8 *src,size_t wCnt) {
size_t n;
for (n=0;n<8*wCnt;n+=8)
dst[n/8] = (((uint64) src[n ]) ) +
(((uint64) src[n+1]) << 8) +
(((uint64) src[n+2]) << 16) +
(((uint64) src[n+3]) << 24) +
(((uint64) src[n+4]) << 32) +
(((uint64) src[n+5]) << 40) +
(((uint64) src[n+6]) << 48) +
(((uint64) src[n+7]) << 56) ;
}
static void Skein_Put64_LSB_First(uint8 *dst,const uint64 *src,size_t bCnt) {
size_t n;
for (n=0;n<bCnt;n++)
dst[n] = (uint8) (src[n>>3] >> (8*(n&7)));
}
enum {
R_512_0_0=46, R_512_0_1=36, R_512_0_2=19, R_512_0_3=37,
R_512_1_0=33, R_512_1_1=27, R_512_1_2=14, R_512_1_3=42,
R_512_2_0=17, R_512_2_1=49, R_512_2_2=36, R_512_2_3=39,
R_512_3_0=44, R_512_3_1= 9, R_512_3_2=54, R_512_3_3=56,
R_512_4_0=39, R_512_4_1=30, R_512_4_2=34, R_512_4_3=24,
R_512_5_0=13, R_512_5_1=50, R_512_5_2=10, R_512_5_3=17,
R_512_6_0=25, R_512_6_1=29, R_512_6_2=39, R_512_6_3=43,
R_512_7_0= 8, R_512_7_1=35, R_512_7_2=56, R_512_7_3=22,
};
typedef struct {
uint64 T[2]; /* tweak words: T[0]=byte cnt, T[1]=flags */
uint64 X[8]; /* chaining variables */
uint8 b[64]; /* partial block buffer (8-byte aligned) */
} Skein_512_Ctxt_t;
#define KW_TWK_BASE (0)
#define KW_KEY_BASE (3)
#define ks (kw + KW_KEY_BASE)
#define ts (kw + KW_TWK_BASE)
static void Skein_512_Process_Block(Skein_512_Ctxt_t *ctx,const uint8 *blkPtr,size_t blkCnt,size_t byteCntAdd)
{
uint64 kw[12]; /* key schedule words : chaining vars + tweak */
uint64 X0,X1,X2,X3,X4,X5,X6,X7; /* local copy of vars, for speed */
uint64 w[8]; /* local copy of input block */
ts[0] = ctx->T[0];
ts[1] = ctx->T[1];
do {
ts[0] += byteCntAdd;
ks[0] = ctx->X[0];
ks[1] = ctx->X[1];
ks[2] = ctx->X[2];
ks[3] = ctx->X[3];
ks[4] = ctx->X[4];
ks[5] = ctx->X[5];
ks[6] = ctx->X[6];
ks[7] = ctx->X[7];
ks[8] = ks[0] ^ ks[1] ^ ks[2] ^ ks[3] ^
ks[4] ^ ks[5] ^ ks[6] ^ ks[7] ^ SKEIN_KS_PARITY;
ts[2] = ts[0] ^ ts[1];
Skein_Get64_LSB_First(w,blkPtr,8);
X0 = w[0] + ks[0];
X1 = w[1] + ks[1];
X2 = w[2] + ks[2];
X3 = w[3] + ks[3];
X4 = w[4] + ks[4];
X5 = w[5] + ks[5] + ts[0];
X6 = w[6] + ks[6] + ts[1];
X7 = w[7] + ks[7];
blkPtr += 64;
#define R512(p0,p1,p2,p3,p4,p5,p6,p7,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; \
X##p4 += X##p5; X##p5 = RotL_64(X##p5,ROT##_2); X##p5 ^= X##p4; \
X##p6 += X##p7; X##p7 = RotL_64(X##p7,ROT##_3); X##p7 ^= X##p6; \
#define I512(R) \
X0 += ks[((R)+1) % 9]; /* inject the key schedule value */ \
X1 += ks[((R)+2) % 9]; \
X2 += ks[((R)+3) % 9]; \
X3 += ks[((R)+4) % 9]; \
X4 += ks[((R)+5) % 9]; \
X5 += ks[((R)+6) % 9] + ts[((R)+1) % 3]; \
X6 += ks[((R)+7) % 9] + ts[((R)+2) % 3]; \
X7 += ks[((R)+8) % 9] + (R)+1; \
#define R512_8_rounds(R) \
R512(0,1,2,3,4,5,6,7,R_512_0,8*(R)+ 1); \
R512(2,1,4,7,6,5,0,3,R_512_1,8*(R)+ 2); \
R512(4,1,6,3,0,5,2,7,R_512_2,8*(R)+ 3); \
R512(6,1,0,7,2,5,4,3,R_512_3,8*(R)+ 4); \
I512(2*(R)); \
R512(0,1,2,3,4,5,6,7,R_512_4,8*(R)+ 5); \
R512(2,1,4,7,6,5,0,3,R_512_5,8*(R)+ 6); \
R512(4,1,6,3,0,5,2,7,R_512_6,8*(R)+ 7); \
R512(6,1,0,7,2,5,4,3,R_512_7,8*(R)+ 8); \
I512(2*(R)+1);
R512_8_rounds( 0);
R512_8_rounds( 1);
R512_8_rounds( 2);
R512_8_rounds( 3);
R512_8_rounds( 4);
R512_8_rounds( 5);
R512_8_rounds( 6);
R512_8_rounds( 7);
R512_8_rounds( 8);
ctx->X[0] = X0 ^ w[0];
ctx->X[1] = X1 ^ w[1];
ctx->X[2] = X2 ^ w[2];
ctx->X[3] = X3 ^ w[3];
ctx->X[4] = X4 ^ w[4];
ctx->X[5] = X5 ^ w[5];
ctx->X[6] = X6 ^ w[6];
ctx->X[7] = X7 ^ w[7];
ts[1] &= ~(((uint64) 64 ) << 56);
} while (--blkCnt);
ctx->T[0] = ts[0];
ctx->T[1] = ts[1];
}
int skein(unsigned char *out, const unsigned char *in, unsigned long long inlen)
{
Skein_512_Ctxt_t ctx;
memcpy(ctx.X,IV,sizeof(ctx.X));
ctx.T[0] = 0;
ctx.T[1] = ((uint64) 112) << 56;
if (inlen > 64) {
size_t n = (inlen-1) / 64;
Skein_512_Process_Block(&ctx,in,n,64);
inlen -= n * 64;
in += n * 64;
}
memset(ctx.b,0,sizeof(ctx.b));
if (inlen) memcpy(ctx.b,in,inlen);
ctx.T[1] |= ((uint64) 128) << 56;
Skein_512_Process_Block(&ctx,ctx.b,1,inlen);
memset(ctx.b,0,sizeof(ctx.b));
ctx.T[0] = 0;
ctx.T[1] = ((uint64) 255) << 56;
Skein_512_Process_Block(&ctx,ctx.b,1,sizeof(uint64));
Skein_Put64_LSB_First(out,ctx.X,64);
return 0;
}
int skeinmid(unsigned char *out, const unsigned char *in)
{
Skein_512_Ctxt_t ctx;
memcpy(ctx.X,IV,sizeof(ctx.X));
ctx.T[0] = 0;
ctx.T[1] = ((uint64) 112) << 56;
Skein_512_Process_Block(&ctx,in,1,64);
memcpy(out, ctx.X, 64);
return 0;
}
void skein_regenhash(struct work *work)
{
uint32_t be_data[20];
unsigned char hash1[64];
flip80(be_data, work->data);
skein(hash1, (const unsigned char *)be_data, 80);
sha256(hash1, 64, work->hash);
}
bool skein_prepare_work(struct thr_info __maybe_unused *thr, struct work *work)
{
uint32_t be_data[20];
flip80(be_data, work->data);
skeinmid((unsigned char *)work->blk.skein_midstate, (const unsigned char *)be_data);
memcpy(work->blk.skein_data, be_data + 16, 12);
return true;
}