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/*
* sha2_256 block cipher - unrolled version
*
* note: the following upper and lower case macro names are distinct
* and reflect the functions defined in FIPS pub. 180-2.
*/
#include "os.h"
#define ROTR(x,n) (((x) >> (n)) | ((x) << (32-(n))))
#define sigma0(x) (ROTR((x),7) ^ ROTR((x),18) ^ ((x) >> 3))
#define sigma1(x) (ROTR((x),17) ^ ROTR((x),19) ^ ((x) >> 10))
#define SIGMA0(x) (ROTR((x),2) ^ ROTR((x),13) ^ ROTR((x),22))
#define SIGMA1(x) (ROTR((x),6) ^ ROTR((x),11) ^ ROTR((x),25))
#define Ch(x,y,z) ((z) ^ ((x) & ((y) ^ (z))))
#define Maj(x,y,z) (((x) | (y)) & ((z) | ((x) & (y))))
/*
* first 32 bits of the fractional parts of cube roots of
* first 64 primes (2..311).
*/
static u32int K256[64] = {
0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,
0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5,
0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,
0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174,
0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,
0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da,
0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,
0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967,
0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,
0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85,
0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,
0xd192e819,0xd6990624,0xf40e3585,0x106aa070,
0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,
0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3,
0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,
0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2,
};
void
_sha2block64(uchar *p, ulong len, u32int *s)
{
u32int w[16], a, b, c, d, e, f, g, h;
uchar *end;
/* at this point, we have a multiple of 64 bytes */
for(end = p+len; p < end;){
a = s[0];
b = s[1];
c = s[2];
d = s[3];
e = s[4];
f = s[5];
g = s[6];
h = s[7];
#define STEP(a,b,c,d,e,f,g,h,i) \
if(i < 16) {\
w[i] = p[0]<<24 | p[1]<<16 | p[2]<<8 | p[3]; \
p += 4; \
} else { \
w[i&15] += sigma1(w[i-2&15]) + w[i-7&15] + sigma0(w[i-15&15]); \
} \
h += SIGMA1(e) + Ch(e,f,g) + K256[i] + w[i&15]; \
d += h; \
h += SIGMA0(a) + Maj(a,b,c);
STEP(a,b,c,d,e,f,g,h,0);
STEP(h,a,b,c,d,e,f,g,1);
STEP(g,h,a,b,c,d,e,f,2);
STEP(f,g,h,a,b,c,d,e,3);
STEP(e,f,g,h,a,b,c,d,4);
STEP(d,e,f,g,h,a,b,c,5);
STEP(c,d,e,f,g,h,a,b,6);
STEP(b,c,d,e,f,g,h,a,7);
STEP(a,b,c,d,e,f,g,h,8);
STEP(h,a,b,c,d,e,f,g,9);
STEP(g,h,a,b,c,d,e,f,10);
STEP(f,g,h,a,b,c,d,e,11);
STEP(e,f,g,h,a,b,c,d,12);
STEP(d,e,f,g,h,a,b,c,13);
STEP(c,d,e,f,g,h,a,b,14);
STEP(b,c,d,e,f,g,h,a,15);
STEP(a,b,c,d,e,f,g,h,16);
STEP(h,a,b,c,d,e,f,g,17);
STEP(g,h,a,b,c,d,e,f,18);
STEP(f,g,h,a,b,c,d,e,19);
STEP(e,f,g,h,a,b,c,d,20);
STEP(d,e,f,g,h,a,b,c,21);
STEP(c,d,e,f,g,h,a,b,22);
STEP(b,c,d,e,f,g,h,a,23);
STEP(a,b,c,d,e,f,g,h,24);
STEP(h,a,b,c,d,e,f,g,25);
STEP(g,h,a,b,c,d,e,f,26);
STEP(f,g,h,a,b,c,d,e,27);
STEP(e,f,g,h,a,b,c,d,28);
STEP(d,e,f,g,h,a,b,c,29);
STEP(c,d,e,f,g,h,a,b,30);
STEP(b,c,d,e,f,g,h,a,31);
STEP(a,b,c,d,e,f,g,h,32);
STEP(h,a,b,c,d,e,f,g,33);
STEP(g,h,a,b,c,d,e,f,34);
STEP(f,g,h,a,b,c,d,e,35);
STEP(e,f,g,h,a,b,c,d,36);
STEP(d,e,f,g,h,a,b,c,37);
STEP(c,d,e,f,g,h,a,b,38);
STEP(b,c,d,e,f,g,h,a,39);
STEP(a,b,c,d,e,f,g,h,40);
STEP(h,a,b,c,d,e,f,g,41);
STEP(g,h,a,b,c,d,e,f,42);
STEP(f,g,h,a,b,c,d,e,43);
STEP(e,f,g,h,a,b,c,d,44);
STEP(d,e,f,g,h,a,b,c,45);
STEP(c,d,e,f,g,h,a,b,46);
STEP(b,c,d,e,f,g,h,a,47);
STEP(a,b,c,d,e,f,g,h,48);
STEP(h,a,b,c,d,e,f,g,49);
STEP(g,h,a,b,c,d,e,f,50);
STEP(f,g,h,a,b,c,d,e,51);
STEP(e,f,g,h,a,b,c,d,52);
STEP(d,e,f,g,h,a,b,c,53);
STEP(c,d,e,f,g,h,a,b,54);
STEP(b,c,d,e,f,g,h,a,55);
STEP(a,b,c,d,e,f,g,h,56);
STEP(h,a,b,c,d,e,f,g,57);
STEP(g,h,a,b,c,d,e,f,58);
STEP(f,g,h,a,b,c,d,e,59);
STEP(e,f,g,h,a,b,c,d,60);
STEP(d,e,f,g,h,a,b,c,61);
STEP(c,d,e,f,g,h,a,b,62);
STEP(b,c,d,e,f,g,h,a,63);
s[0] += a;
s[1] += b;
s[2] += c;
s[3] += d;
s[4] += e;
s[5] += f;
s[6] += g;
s[7] += h;
}
}
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