/* * 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;	}}