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crypto: Implement crypto_derive_pmk_r0

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Andrew Zaborowski 2016-09-06 23:43:39 +02:00 committed by Denis Kenzior
parent 955c88a64a
commit 994ffd94c5
2 changed files with 64 additions and 0 deletions
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57
src/crypto.c
View File

@ -478,3 +478,60 @@ bool crypto_derive_pairwise_ptk(const uint8_t *pmk,
(uint8_t *) out_ptk, ptk_len,
use_sha256);
}
/* Defined in 802.11-2012, Section 11.6.1.7.3 PMK-R0 */
bool crypto_derive_pmk_r0(const uint8_t *xxkey,
const uint8_t *ssid, size_t ssid_len,
uint16_t mdid,
const uint8_t *r0khid, size_t r0kh_len,
const uint8_t *s0khid, uint8_t *out_pmk_r0,
uint8_t *out_pmk_r0_name)
{
uint8_t context[512];
size_t pos = 0;
uint8_t output[48];
struct l_checksum *sha256;
bool r = false;
struct iovec iov[2] = {
[0] = { .iov_base = "FT-R0N", .iov_len = 6 },
[1] = { .iov_base = output + 32, .iov_len = 16 },
};
context[pos++] = ssid_len;
memcpy(context + pos, ssid, ssid_len);
pos += ssid_len;
l_put_le16(mdid, context + pos);
pos += 2;
context[pos++] = r0kh_len;
memcpy(context + pos, r0khid, r0kh_len);
pos += r0kh_len;
memcpy(context + pos, s0khid, ETH_ALEN);
pos += ETH_ALEN;
if (!kdf_sha256(xxkey, 32, "FT-R0", 5, context, pos, output, 48))
goto exit;
sha256 = l_checksum_new(L_CHECKSUM_SHA256);
if (!sha256)
goto exit;
l_checksum_updatev(sha256, iov, 2);
l_checksum_get_digest(sha256, out_pmk_r0_name, 16);
l_checksum_free(sha256);
memcpy(out_pmk_r0, output, 32);
r = true;
exit:
memset(context, 0, pos);
memset(output, 0, 48);
return r;
}

7
src/crypto.h
View File

@ -79,3 +79,10 @@ bool crypto_derive_pairwise_ptk(const uint8_t *pmk,
const uint8_t *nonce1, const uint8_t *nonce2,
struct crypto_ptk *out_ptk, size_t ptk_len,
bool use_sha256);
bool crypto_derive_pmk_r0(const uint8_t *xxkey,
const uint8_t *ssid, size_t ssid_len,
uint16_t mdid,
const uint8_t *r0khid, size_t r0kh_len,
const uint8_t *s0khid, uint8_t *out_pmk_r0,
uint8_t *out_pmk_r0_name);