2017-09-24 21:13:16 +02:00
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#include <stdint.h>
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#include "types.h"
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#include "keccak.h"
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#define FOR(i,n) for(i=0; i<n; ++i)
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typedef u32 ui;
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static int LFSR86540(u8 *R) { (*R)=((*R)<<1)^(((*R)&0x80)?0x71:0); return ((*R)&2)>>1; }
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#define ROL(a,o) ((((u64)a)<<o)^(((u64)a)>>(64-o)))
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static u64 load64(const u8 *x) { ui i; u64 u=0; FOR(i,8) { u<<=8; u|=x[7-i]; } return u; }
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static void store64(u8 *x, u64 u) { ui i; FOR(i,8) { x[i]=u; u>>=8; } }
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static void xor64(u8 *x, u64 u) { ui i; FOR(i,8) { x[i]^=u; u>>=8; } }
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#define rL(x,y) load64((u8*)s+8*(x+5*y))
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#define wL(x,y,l) store64((u8*)s+8*(x+5*y),l)
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#define XL(x,y,l) xor64((u8*)s+8*(x+5*y),l)
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static void KeccakF1600(void *s)
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{
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ui r,x,y,i,j,Y; u8 R=0x01; u64 C[5],D;
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for(i=0; i<24; i++) {
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/*θ*/ FOR(x,5) C[x]=rL(x,0)^rL(x,1)^rL(x,2)^rL(x,3)^rL(x,4); FOR(x,5) { D=C[(x+4)%5]^ROL(C[(x+1)%5],1); FOR(y,5) XL(x,y,D); }
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/*ρπ*/ x=1; y=r=0; D=rL(x,y); FOR(j,24) { r+=j+1; Y=(2*x+3*y)%5; x=y; y=Y; C[0]=rL(x,y); wL(x,y,ROL(D,r%64)); D=C[0]; }
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/*χ*/ FOR(y,5) { FOR(x,5) C[x]=rL(x,y); FOR(x,5) wL(x,y,C[x]^((~C[(x+1)%5])&C[(x+2)%5])); }
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/*ι*/ FOR(j,7) if (LFSR86540(&R)) XL(0,0,(u64)1<<((1<<j)-1));
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}
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}
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2017-10-23 04:15:23 +02:00
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void Keccak(u32 r, const u8 *in, u64 inLen, u8 sfx, u8 *out, u64 outLen)
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2017-09-24 21:13:16 +02:00
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{
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/*initialize*/ u8 s[200]; ui R=r/8; ui i,b=0; FOR(i,200) s[i]=0;
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/*absorb*/ while(inLen>0) { b=(inLen<R)?inLen:R; FOR(i,b) s[i]^=in[i]; in+=b; inLen-=b; if (b==R) { KeccakF1600(s); b=0; } }
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/*pad*/ s[b]^=sfx; if((sfx&0x80)&&(b==(R-1))) KeccakF1600(s); s[R-1]^=0x80; KeccakF1600(s);
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/*squeeze*/ while(outLen>0) { b=(outLen<R)?outLen:R; FOR(i,b) out[i]=s[i]; out+=b; outLen-=b; if(outLen>0) KeccakF1600(s); }
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}
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