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WebSVN – planix.SVN – Blame – /os/branches/feature_unix/sys/src/libsec/port/curve25519_dh.c – Rev 26

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26 7u83 1 
#include "os.h"
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#include <mp.h>
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#include <libsec.h>
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static uchar nine[32] = {9};
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void
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curve25519_dh_new(uchar x[32], uchar y[32])
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{
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	uchar b;
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	/* new public/private key pair */
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	genrandom(x, 32);
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	b = x[31];
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	x[0] &= ~7;			/* clear bit 0,1,2 */
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	x[31] = 0x40 | (b & 0x7f);	/* set bit 254, clear bit 255 */
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	curve25519(y, x, nine);
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	/* bit 255 is always 0, so make it random */
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	y[31] |= b & 0x80;
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}
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void
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curve25519_dh_finish(uchar x[32], uchar y[32], uchar z[32])
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{
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	/* remove the random bit */
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	y[31] &= 0x7f;
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	/* calculate dhx key */
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	curve25519(z, x, y);
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	memset(x, 0, 32);
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	memset(y, 0, 32);
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}