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/* ISC license. */
#include "sha1-internal.h"
#define F1(x, y, z) ((x & y) | ((~x) & z))
#define F2(x, y, z) (x ^ y ^ z)
#define F3(x, y, z) ((x & y) | (x & z) | (y & z))
#define F4(x, y, z) (x ^ y ^ z)
#define SHA1STEP(f, data) \
{ \
uint32_t tmp = e + f(b, c, d) + data + ((a<<5) | (a>>27)); \
e = d ; \
d = c ; \
c = (b<<30) | (b>>2) ; \
b = a ; \
a = tmp ; \
}
void sha1_transform (uint32_t *buf, uint32_t const *in)
{
uint32_t a = buf[0], b = buf[1], c = buf[2], d = buf[3], e = buf[4] ;
uint32_t w[80] ;
unsigned int i = 0 ;
for (; i < 16 ; i++) w[i] = in[i] ;
for (; i < 80 ; i++)
{
w[i] = w[i-3] ^ w[i-8] ^ w[i-14] ^ w[i-16] ;
w[i] = (w[i]<<1) | (w[i]>>31) ;
}
for (i = 0 ; i < 20 ; i++)
SHA1STEP(F1, w[i] + 0x5a827999U) ;
for (; i < 40 ; i++)
SHA1STEP(F2, w[i] + 0x6ed9eba1U) ;
for (; i < 60 ; i++)
SHA1STEP(F3, w[i] + 0x8f1bbcdcU) ;
for (; i < 80 ; i++)
SHA1STEP(F4, w[i] + 0xca62c1d6U) ;
buf[0] += a ; buf[1] += b ; buf[2] += c ; buf[3] += d ; buf[4] += e ;
}
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