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fix ecdh

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NIIBE Yutaka
2013-09-26 13:24:25 +09:00
parent 31de01469d
commit 34f2fa5380
1 changed files with 10 additions and 2 deletions
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12
src/ecc-cdh.c
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@@ -56,13 +56,21 @@ ecdh (unsigned char *key,
ac S[1];
sha256_context ctx;
unsigned char kek[32];
unsigned char x[32];
int i;
const unsigned char *p;
compute_kP (S, naf_d, P); /* Get shared key. */
compute_kP (S, naf_d, P); /* Get shared secret. */
/* Endian change from big to little. */
p = (const unsigned char *)S->x;
for (i = 0; i < 32; i++)
x[31-i] = p[i];
/* kdf (kek, S, parameter) */
sha256_start (&ctx);
sha256_update (&ctx, "\x00\x00\x00\x01", 4);
sha256_update (&ctx, (const char *)S, size of S); /* XXX 04, X, Y bigendian!! */
sha256_update (&ctx, x, size of x);
sha256_update (&ctx, (const char *)param, size of param);
sha256_finish (&ctx, kek);
}