| sha1_simd.cpp |
For each multiple of 4, t, we want to calculate this:
W[t+0] = rol(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16], 1);
W[t+1] = rol(W[t-2] ^ W[t-7] ^ W[t-13] ^ W[t-15], 1);
W[t+2] = rol(W[t-1] ^ W[t-6] ^ W[t-12] ^ W[t-14], 1);
W[t+3] = rol(W[t] ^ W[t-5] ^ W[t-11] ^ W[t-13], 1);
we'll actually calculate this:
W[t+0] = rol(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16], 1);
W[t+1] = rol(W[t-2] ^ W[t-7] ^ W[t-13] ^ W[t-15], 1);
W[t+2] = rol(W[t-1] ^ W[t-6] ^ W[t-12] ^ W[t-14], 1);
W[t+3] = rol( 0 ^ W[t-5] ^ W[t-11] ^ W[t-13], 1);
W[t+3] ^= rol(W[t+0], 1);
the parameters are:
W0 = &W[t-16];
W1 = &W[t-12];
W2 = &W[t- 8];
W3 = &W[t- 4];
and on output:
prepared = W0 + K
W0 = W[t]..W[t+3]
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