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crypto: Add crypto_derive_ptk

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This commit is contained in:
Denis Kenzior 2014-12-26 11:46:27 -06:00
parent f8c5e4d93b
commit 0693740731
2 changed files with 47 additions and 0 deletions
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41
src/crypto.c
View File

@ -27,6 +27,7 @@
#include <stdbool.h> #include <stdbool.h>
#include <string.h> #include <string.h>
#include <errno.h> #include <errno.h>
#include <linux/if_ether.h>
#include <ell/ell.h> #include <ell/ell.h>
@ -85,3 +86,43 @@ int crypto_psk_from_passphrase(const char *passphrase,
return 0; return 0;
} }
/*
* 802.11, Section 11.6.6.7:
* PTK = PRF-X(PMK, "Pairwise key expansion", Min(AA, SA) || Max(AA, SA) ||
* Min(ANonce, SNonce) || Max(ANonce, SNonce))
*/
bool crypto_derive_ptk(uint8_t *pmk, size_t pmk_len, const char *label,
uint8_t *addr1, uint8_t *addr2,
uint8_t *nonce1, uint8_t *nonce2,
uint8_t *out_ptk, size_t ptk_len)
{
/* Nonce length is 32 */
uint8_t data[ETH_ALEN * 2 + 64];
size_t pos = 0;
/* Address 1 is less than Address 2 */
if (memcmp(addr1, addr2, ETH_ALEN) < 0) {
memcpy(data, addr1, ETH_ALEN);
memcpy(data + ETH_ALEN, addr2, ETH_ALEN);
} else {
memcpy(data, addr2, ETH_ALEN);
memcpy(data + ETH_ALEN, addr1, ETH_ALEN);
}
pos += ETH_ALEN * 2;
/* Nonce1 is less than Nonce2 */
if (memcmp(nonce1, nonce2, 32) < 0) {
memcpy(data + pos, nonce1, 32);
memcpy(data + pos + 32, nonce2, 32);
} else {
memcpy(data + pos, nonce2, 32);
memcpy(data + pos + 32, nonce1, 32);
}
pos += 64;
return prf_sha1(pmk, pmk_len, label, strlen(label),
data, sizeof(data), out_ptk, ptk_len);
}

6
src/crypto.h
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@ -21,7 +21,13 @@
*/ */
#include <stddef.h> #include <stddef.h>
#include <stdbool.h>
int crypto_psk_from_passphrase(const char *passphrase, int crypto_psk_from_passphrase(const char *passphrase,
const unsigned char *ssid, size_t ssid_len, const unsigned char *ssid, size_t ssid_len,
unsigned char *out_psk); unsigned char *out_psk);
bool crypto_derive_ptk(uint8_t *pmk, size_t pmk_len, const char *label,
uint8_t *addr1, uint8_t *addr2,
uint8_t *nonce1, uint8_t *nonce2,
uint8_t *out_ptk, size_t ptk_len);