ref: 56ac6ea29e1b9dfdad8c7b1875f81c242362da2a
dir: /sys/src/libsec/port/sha1block.c/
#include "os.h"
void
_sha1block(uchar *p, ulong len, u32int *s)
{
u32int a, b, c, d, e, x;
uchar *end;
u32int *wp, *wend;
u32int w[80];
/* 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];
wend = w + 15;
for(wp = w; wp < wend; wp += 5){
wp[0] = (p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
e += ((a<<5) | (a>>27)) + wp[0];
e += 0x5a827999 + (((c^d)&b)^d);
b = (b<<30)|(b>>2);
wp[1] = (p[4]<<24) | (p[5]<<16) | (p[6]<<8) | p[7];
d += ((e<<5) | (e>>27)) + wp[1];
d += 0x5a827999 + (((b^c)&a)^c);
a = (a<<30)|(a>>2);
wp[2] = (p[8]<<24) | (p[9]<<16) | (p[10]<<8) | p[11];
c += ((d<<5) | (d>>27)) + wp[2];
c += 0x5a827999 + (((a^b)&e)^b);
e = (e<<30)|(e>>2);
wp[3] = (p[12]<<24) | (p[13]<<16) | (p[14]<<8) | p[15];
b += ((c<<5) | (c>>27)) + wp[3];
b += 0x5a827999 + (((e^a)&d)^a);
d = (d<<30)|(d>>2);
wp[4] = (p[16]<<24) | (p[17]<<16) | (p[18]<<8) | p[19];
a += ((b<<5) | (b>>27)) + wp[4];
a += 0x5a827999 + (((d^e)&c)^e);
c = (c<<30)|(c>>2);
p += 20;
}
wp[0] = (p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
e += ((a<<5) | (a>>27)) + wp[0];
e += 0x5a827999 + (((c^d)&b)^d);
b = (b<<30)|(b>>2);
x = wp[-2] ^ wp[-7] ^ wp[-13] ^ wp[-15];
wp[1] = (x<<1) | (x>>31);
d += ((e<<5) | (e>>27)) + wp[1];
d += 0x5a827999 + (((b^c)&a)^c);
a = (a<<30)|(a>>2);
x = wp[-1] ^ wp[-6] ^ wp[-12] ^ wp[-14];
wp[2] = (x<<1) | (x>>31);
c += ((d<<5) | (d>>27)) + wp[2];
c += 0x5a827999 + (((a^b)&e)^b);
e = (e<<30)|(e>>2);
x = wp[0] ^ wp[-5] ^ wp[-11] ^ wp[-13];
wp[3] = (x<<1) | (x>>31);
b += ((c<<5) | (c>>27)) + wp[3];
b += 0x5a827999 + (((e^a)&d)^a);
d = (d<<30)|(d>>2);
x = wp[1] ^ wp[-4] ^ wp[-10] ^ wp[-12];
wp[4] = (x<<1) | (x>>31);
a += ((b<<5) | (b>>27)) + wp[4];
a += 0x5a827999 + (((d^e)&c)^e);
c = (c<<30)|(c>>2);
wp += 5;
p += 4;
wend = w + 40;
for(; wp < wend; wp += 5){
x = wp[-3] ^ wp[-8] ^ wp[-14] ^ wp[-16];
wp[0] = (x<<1) | (x>>31);
e += ((a<<5) | (a>>27)) + wp[0];
e += 0x6ed9eba1 + (b^c^d);
b = (b<<30)|(b>>2);
x = wp[-2] ^ wp[-7] ^ wp[-13] ^ wp[-15];
wp[1] = (x<<1) | (x>>31);
d += ((e<<5) | (e>>27)) + wp[1];
d += 0x6ed9eba1 + (a^b^c);
a = (a<<30)|(a>>2);
x = wp[-1] ^ wp[-6] ^ wp[-12] ^ wp[-14];
wp[2] = (x<<1) | (x>>31);
c += ((d<<5) | (d>>27)) + wp[2];
c += 0x6ed9eba1 + (e^a^b);
e = (e<<30)|(e>>2);
x = wp[0] ^ wp[-5] ^ wp[-11] ^ wp[-13];
wp[3] = (x<<1) | (x>>31);
b += ((c<<5) | (c>>27)) + wp[3];
b += 0x6ed9eba1 + (d^e^a);
d = (d<<30)|(d>>2);
x = wp[1] ^ wp[-4] ^ wp[-10] ^ wp[-12];
wp[4] = (x<<1) | (x>>31);
a += ((b<<5) | (b>>27)) + wp[4];
a += 0x6ed9eba1 + (c^d^e);
c = (c<<30)|(c>>2);
}
wend = w + 60;
for(; wp < wend; wp += 5){
x = wp[-3] ^ wp[-8] ^ wp[-14] ^ wp[-16];
wp[0] = (x<<1) | (x>>31);
e += ((a<<5) | (a>>27)) + wp[0];
e += 0x8f1bbcdc + ((b&c)|((b|c)&d));
b = (b<<30)|(b>>2);
x = wp[-2] ^ wp[-7] ^ wp[-13] ^ wp[-15];
wp[1] = (x<<1) | (x>>31);
d += ((e<<5) | (e>>27)) + wp[1];
d += 0x8f1bbcdc + ((a&b)|((a|b)&c));
a = (a<<30)|(a>>2);
x = wp[-1] ^ wp[-6] ^ wp[-12] ^ wp[-14];
wp[2] = (x<<1) | (x>>31);
c += ((d<<5) | (d>>27)) + wp[2];
c += 0x8f1bbcdc + ((e&a)|((e|a)&b));
e = (e<<30)|(e>>2);
x = wp[0] ^ wp[-5] ^ wp[-11] ^ wp[-13];
wp[3] = (x<<1) | (x>>31);
b += ((c<<5) | (c>>27)) + wp[3];
b += 0x8f1bbcdc + ((d&e)|((d|e)&a));
d = (d<<30)|(d>>2);
x = wp[1] ^ wp[-4] ^ wp[-10] ^ wp[-12];
wp[4] = (x<<1) | (x>>31);
a += ((b<<5) | (b>>27)) + wp[4];
a += 0x8f1bbcdc + ((c&d)|((c|d)&e));
c = (c<<30)|(c>>2);
}
wend = w + 80;
for(; wp < wend; wp += 5){
x = wp[-3] ^ wp[-8] ^ wp[-14] ^ wp[-16];
wp[0] = (x<<1) | (x>>31);
e += ((a<<5) | (a>>27)) + wp[0];
e += 0xca62c1d6 + (b^c^d);
b = (b<<30)|(b>>2);
x = wp[-2] ^ wp[-7] ^ wp[-13] ^ wp[-15];
wp[1] = (x<<1) | (x>>31);
d += ((e<<5) | (e>>27)) + wp[1];
d += 0xca62c1d6 + (a^b^c);
a = (a<<30)|(a>>2);
x = wp[-1] ^ wp[-6] ^ wp[-12] ^ wp[-14];
wp[2] = (x<<1) | (x>>31);
c += ((d<<5) | (d>>27)) + wp[2];
c += 0xca62c1d6 + (e^a^b);
e = (e<<30)|(e>>2);
x = wp[0] ^ wp[-5] ^ wp[-11] ^ wp[-13];
wp[3] = (x<<1) | (x>>31);
b += ((c<<5) | (c>>27)) + wp[3];
b += 0xca62c1d6 + (d^e^a);
d = (d<<30)|(d>>2);
x = wp[1] ^ wp[-4] ^ wp[-10] ^ wp[-12];
wp[4] = (x<<1) | (x>>31);
a += ((b<<5) | (b>>27)) + wp[4];
a += 0xca62c1d6 + (c^d^e);
c = (c<<30)|(c>>2);
}
/* save state */
s[0] += a;
s[1] += b;
s[2] += c;
s[3] += d;
s[4] += e;
}
}