TweetableFIPS202.tweets

// FIPS202 in 7 tweets
#define R(a,n)a<<n^a>>64-n
#define H(i,r,p,d)int crypto_hash_sha3##i(C*h,const C*m,U n){k(r*8,m,n,p,h,d);return 0;}

#define H2(i,r,p)int crypto_hash_shake##i(C*h,U d,const C*m,U n){k(r*8,m,n,p,h,d);return 0;}
#define L(i,n)for(U i=0;i<n;i++)
typedef long

long unsigned U;typedef unsigned char C;
#define S(x)L(i,r)s[i/8]^=(U)x[i]<<i%8*8
void F(U*s){C R=1,r,x,y;U t,B[5],Y;L(n,24){L(i,5){B[i]=0;L

(j,5)B[i]^=s[i+5*j];}L(i,5){t=B[(i+4)%5]^R(B[(i+1)%5],1);L(j,5)s[i+5*j]^=t;}t=s[1];y=r=0;x=1;L(j,24){r+=j+1;Y=2*x+3*y;x=y;y=Y%5;Y=s[x+5*y];s

[x+5*y]=R(t,r%64);t=Y;}L(j,5){L(i,5)B[i]=s[i+5*j];L(i,5)s[i+5*j]=B[i]^(~B[(i+1)%5]&B[(i+2)%5]);}L(j,7)if((R=(R<<1)^(113*(R>>7)))&2)*s^=1ULL

<<((1<<j)-1);}}void k(C r,const C*m,U n,C p,C*h,U d){U s[25]={0};C t[200]={0};while(n>=r){S(m);F(s);n-=r;m+=r;}L(i,n)t[i]=m[i];t[n]=p;t[r-1]

|=128;S(t);L(i,d){if(0==i%r)F(s);h[i]=s[i%r/8]>>8*(i%8);}}H(224,18,6,28)H(256,17,6,32)H(384,13,6,48)H(512,9,6,64)H2(128,21,31)H2(256,17,31)