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crypto: Implement crypto_derive_ft_ptk

This commit is contained in:
Andrew Zaborowski 2016-09-06 23:43:41 +02:00 committed by Denis Kenzior
parent efbbe9870b
commit 443e363c20
2 changed files with 52 additions and 0 deletions
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47
src/crypto.c
View File

@ -578,3 +578,50 @@ exit:
return r;
}
/* Defined in 802.11-2012, Section 11.6.1.7.5 PTK */
bool crypto_derive_ft_ptk(const uint8_t *pmk_r1, const uint8_t *pmk_r1_name,
const uint8_t *addr1, const uint8_t *addr2,
const uint8_t *nonce1, const uint8_t *nonce2,
struct crypto_ptk *out_ptk, size_t ptk_len,
uint8_t *out_ptk_name)
{
uint8_t context[ETH_ALEN * 2 + 64];
struct l_checksum *sha256;
bool r = false;
struct iovec iov[3] = {
[0] = { .iov_base = (uint8_t *) pmk_r1_name, .iov_len = 16 },
[1] = { .iov_base = "FT-PTKN", .iov_len = 7 },
[2] = { .iov_base = context, .iov_len = sizeof(context) },
};
memcpy(context, nonce1, 32);
memcpy(context + 32, nonce2, 32);
memcpy(context + 64, addr1, ETH_ALEN);
memcpy(context + 64 + ETH_ALEN, addr2, ETH_ALEN);
if (!kdf_sha256(pmk_r1, 32, "FT-PTK", 6, context, sizeof(context),
out_ptk, ptk_len))
goto exit;
sha256 = l_checksum_new(L_CHECKSUM_SHA256);
if (!sha256) {
memset(out_ptk, 0, ptk_len);
goto exit;
}
l_checksum_updatev(sha256, iov, 3);
l_checksum_get_digest(sha256, out_ptk_name, 16);
l_checksum_free(sha256);
r = true;
exit:
memset(context, 0, sizeof(context));
return r;
}

5
src/crypto.h
View File

@ -91,3 +91,8 @@ bool crypto_derive_pmk_r1(const uint8_t *pmk_r0,
const uint8_t *pmk_r0_name,
uint8_t *out_pmk_r1,
uint8_t *out_pmk_r1_name);
bool crypto_derive_ft_ptk(const uint8_t *pmk_r1, const uint8_t *pmk_r1_name,
const uint8_t *addr1, const uint8_t *addr2,
const uint8_t *nonce1, const uint8_t *nonce2,
struct crypto_ptk *out_ptk, size_t ptk_len,
uint8_t *out_ptk_name);