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https://git.kernel.org/pub/scm/network/wireless/iwd.git
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crypto: Add crypto_derive_ptk
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parent
f8c5e4d93b
commit
0693740731
41
src/crypto.c
41
src/crypto.c
@ -27,6 +27,7 @@
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#include <stdbool.h>
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#include <string.h>
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#include <errno.h>
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#include <linux/if_ether.h>
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#include <ell/ell.h>
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@ -85,3 +86,43 @@ int crypto_psk_from_passphrase(const char *passphrase,
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return 0;
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}
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/*
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* 802.11, Section 11.6.6.7:
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* PTK = PRF-X(PMK, "Pairwise key expansion", Min(AA, SA) || Max(AA, SA) ||
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* Min(ANonce, SNonce) || Max(ANonce, SNonce))
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*/
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bool crypto_derive_ptk(uint8_t *pmk, size_t pmk_len, const char *label,
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uint8_t *addr1, uint8_t *addr2,
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uint8_t *nonce1, uint8_t *nonce2,
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uint8_t *out_ptk, size_t ptk_len)
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{
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/* Nonce length is 32 */
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uint8_t data[ETH_ALEN * 2 + 64];
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size_t pos = 0;
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/* Address 1 is less than Address 2 */
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if (memcmp(addr1, addr2, ETH_ALEN) < 0) {
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memcpy(data, addr1, ETH_ALEN);
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memcpy(data + ETH_ALEN, addr2, ETH_ALEN);
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} else {
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memcpy(data, addr2, ETH_ALEN);
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memcpy(data + ETH_ALEN, addr1, ETH_ALEN);
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}
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pos += ETH_ALEN * 2;
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/* Nonce1 is less than Nonce2 */
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if (memcmp(nonce1, nonce2, 32) < 0) {
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memcpy(data + pos, nonce1, 32);
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memcpy(data + pos + 32, nonce2, 32);
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} else {
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memcpy(data + pos, nonce2, 32);
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memcpy(data + pos + 32, nonce1, 32);
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}
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pos += 64;
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return prf_sha1(pmk, pmk_len, label, strlen(label),
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data, sizeof(data), out_ptk, ptk_len);
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}
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@ -21,7 +21,13 @@
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*/
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#include <stddef.h>
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#include <stdbool.h>
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int crypto_psk_from_passphrase(const char *passphrase,
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const unsigned char *ssid, size_t ssid_len,
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unsigned char *out_psk);
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bool crypto_derive_ptk(uint8_t *pmk, size_t pmk_len, const char *label,
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uint8_t *addr1, uint8_t *addr2,
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uint8_t *nonce1, uint8_t *nonce2,
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uint8_t *out_ptk, size_t ptk_len);
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