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/* Copyright 2015 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "dcrypto.h"
#include "cryptoc/p256.h"
static const p256_int p256_one = P256_ONE;
/*
* Key selection based on FIPS-186-4, section B.4.2 (Key Pair
* Generation by Testing Candidates).
*/
int DCRYPTO_p256_key_from_bytes(p256_int *x, p256_int *y, p256_int *d,
const uint8_t key_bytes[P256_NBYTES])
{
p256_int key;
p256_from_bin(key_bytes, &key);
if (p256_cmp(&SECP256r1_nMin2, &key) < 0)
return 0;
p256_add(&key, &p256_one, d);
always_memset(&key, 0, sizeof(key));
if (x == NULL || y == NULL)
return 1;
return dcrypto_p256_base_point_mul(d, x, y);
}
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