deon/gnuk
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

fix ecdh

Browse Source
This commit is contained in:
NIIBE Yutaka
2013-09-26 13:24:25 +09:00
parent 31de01469d
commit 34f2fa5380
1 changed files with 10 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
src/ecc-cdh.c
View File

@@ -56,13 +56,21 @@ ecdh (unsigned char *key,
ac S[1]; ac S[1];
sha256_context ctx; sha256_context ctx;
unsigned char kek[32]; 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) */ /* kdf (kek, S, parameter) */
sha256_start (&ctx); sha256_start (&ctx);
sha256_update (&ctx, "\x00\x00\x00\x01", 4); 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_update (&ctx, (const char *)param, size of param);
sha256_finish (&ctx, kek); sha256_finish (&ctx, kek);
} }