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crypto: Prepare for SHA256 based PTK derivation

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This commit is contained in:
Denis Kenzior 2016-02-10 16:54:55 -06:00
parent 55e47c10c8
commit e084839b4f
2 changed files with 18 additions and 14 deletions
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16
src/crypto.c
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@ -400,10 +400,12 @@ bool kdf_sha256(const void *key, size_t key_len,
* Max operations for nonces are with the nonces treated as positive integers
* converted as specified in 8.2.2.
*/
bool crypto_derive_ptk(const uint8_t *pmk, size_t pmk_len, const char *label,
static bool crypto_derive_ptk(const uint8_t *pmk, size_t pmk_len,
const char *label,
const uint8_t *addr1, const uint8_t *addr2,
const uint8_t *nonce1, const uint8_t *nonce2,
uint8_t *out_ptk, size_t ptk_len)
uint8_t *out_ptk, size_t ptk_len,
bool use_sha256)
{
/* Nonce length is 32 */
uint8_t data[ETH_ALEN * 2 + 64];
@ -431,6 +433,10 @@ bool crypto_derive_ptk(const uint8_t *pmk, size_t pmk_len, const char *label,
pos += 64;
if (use_sha256)
return kdf_sha256(pmk, pmk_len, label, strlen(label),
data, sizeof(data), out_ptk, ptk_len);
else
return prf_sha1(pmk, pmk_len, label, strlen(label),
data, sizeof(data), out_ptk, ptk_len);
}
@ -438,9 +444,11 @@ bool crypto_derive_ptk(const uint8_t *pmk, size_t pmk_len, const char *label,
bool crypto_derive_pairwise_ptk(const uint8_t *pmk,
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)
struct crypto_ptk *out_ptk, size_t ptk_len,
bool use_sha256)
{
return crypto_derive_ptk(pmk, 32, "Pairwise key expansion",
addr1, addr2, nonce1, nonce2,
(uint8_t *) out_ptk, ptk_len);
(uint8_t *) out_ptk, ptk_len,
use_sha256);
}

8
src/crypto.h
View File

@ -69,12 +69,8 @@ bool prf_sha1(const void *key, size_t key_len,
const void *prefix, size_t prefix_len,
const void *data, size_t data_len, void *output, size_t size);
bool crypto_derive_ptk(const uint8_t *pmk, size_t pmk_len, const char *label,
const uint8_t *addr1, const uint8_t *addr2,
const uint8_t *nonce1, const uint8_t *nonce2,
uint8_t *out_ptk, size_t ptk_len);
bool crypto_derive_pairwise_ptk(const uint8_t *pmk,
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);
struct crypto_ptk *out_ptk, size_t ptk_len,
bool use_sha256);