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CR50: make public key part generation optional.

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Callers may not need computation of the public key.
Making this optional speeds this routine up.

Cr50 never passes in NULL for any argument, so is not affected.

BUG=none
TEST=build
BRANCH=none
Change-Id: Ia0077a35064f53b53f51867254aaa51eac6c55d8
Reviewed-on: https://chromium-review.googlesource.com/427058
Reviewed-by: Marius Schilder <mschilder@chromium.org>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Tested-by: Marius Schilder <mschilder@chromium.org>
This commit is contained in:
Marius Schilder
2017-01-10 18:07:35 -08:00
committed by Marius Schilder
parent 302431a288
commit 3fc94e5b71
2 changed files with 9 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
chip/g/dcrypto/dcrypto.h
View File

@@ -145,8 +145,13 @@ int DCRYPTO_p256_base_point_mul(p256_int *out_x, p256_int *out_y,
int DCRYPTO_p256_point_mul(p256_int *out_x, p256_int *out_y,
const p256_int *n, const p256_int *in_x,
const p256_int *in_y);
/*
* Produce uniform private key from seed.
* If x or y is NULL, the public key part is not computed.
* Returns !0 on success.
*/
int DCRYPTO_p256_key_from_bytes(p256_int *x, p256_int *y, p256_int *d,
const uint8_t key_bytes[P256_NBYTES]);
const uint8_t bytes[P256_NBYTES]);
/* P256 based integration encryption (DH+AES128+SHA256). */
/* Authenticated data may be provided, where the first auth_data_len
* bytes of in will be authenticated but not encrypted. */

6
chip/g/dcrypto/p256.c
View File

@@ -16,14 +16,14 @@ static const p256_int p256_one = P256_ONE;
int DCRYPTO_p256_key_from_bytes(p256_int *x, p256_int *y, p256_int *d,
const uint8_t key_bytes[P256_NBYTES])
{
int result;
p256_int key;
p256_from_bin(key_bytes, &key);
if (p256_cmp(&SECP256r1_nMin2, &key) < 0)
return 0;
p256_add(&key, &p256_one, d);
result = dcrypto_p256_base_point_mul(d, x, y);
dcrypto_memset(&key, 0, sizeof(key));
return result;
if (x == NULL || y == NULL)
return 1;
return dcrypto_p256_base_point_mul(d, x, y);
}