ref: 3e05a1d462b44a519621901be94566e9300eca93
dir: /libauthsrv/hkdf_x_plan9.c/
#include <u.h>
#include <libc.h>
#include <libsec.h>
#include <authsrv.h>
void
hkdf_x_plan9(uchar crand[2*NONCELEN], uchar key[NONCELEN], uchar secret[256])
{
static char info[] = "Plan 9 session secret";
hkdf_x(crand, 2*NONCELEN,
(uchar*)info, sizeof(info)-1,
key, NONCELEN,
secret, 256,
hmac_sha2_256, SHA2_256dlen);
}