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WebSVN – planix.SVN – Blame – /os/branches/feature_unix/sys/src/libsec/port/chachablock.c – Rev 33

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26 7u83 1 
#include "os.h"
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#define ROTATE(v,c) ((u32int)((v) << (c)) | ((v) >> (32 - (c))))
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#define QUARTERROUND(ia,ib,ic,id) { \
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	u32int a, b, c, d, t; \
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	a = x[ia]; b = x[ib]; c = x[ic]; d = x[id]; \
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	a += b; t = d^a; d = ROTATE(t,16); \
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	c += d; t = b^c; b = ROTATE(t,12); \
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	a += b; t = d^a; d = ROTATE(t, 8); \
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	c += d; t = b^c; b = ROTATE(t, 7); \
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	x[ia] = a; x[ib] = b; x[ic] = c; x[id] = d; \
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}
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void
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_chachablock(u32int x[16], int rounds)
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{
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	for(; rounds > 0; rounds -= 2) {
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		QUARTERROUND(0, 4, 8,12)
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		QUARTERROUND(1, 5, 9,13)
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		QUARTERROUND(2, 6,10,14)
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		QUARTERROUND(3, 7,11,15)
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		QUARTERROUND(0, 5,10,15)
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		QUARTERROUND(1, 6,11,12)
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		QUARTERROUND(2, 7, 8,13)
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		QUARTERROUND(3, 4, 9,14)
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	}
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}