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eapol: Add eapol_decrypt_key_data

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This commit is contained in:
Denis Kenzior 2015-02-13 20:37:17 -06:00
parent a1d00805a4
commit cd08cdfd9f
2 changed files with 36 additions and 0 deletions
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33
src/eapol.c
View File

@ -68,6 +68,39 @@ bool eapol_calculate_mic(const uint8_t *kck, const struct eapol_key *frame,
} }
} }
uint8_t *eapol_decrypt_key_data(const uint8_t *kek,
const struct eapol_key *frame)
{
size_t key_data_len = L_BE16_TO_CPU(frame->key_data_len);
struct l_cipher *cipher;
uint8_t *buf;
bool ret;
switch (frame->key_descriptor_version) {
case EAPOL_KEY_DESCRIPTOR_VERSION_HMAC_MD5_ARC4:
/* TODO: This might require an IV from frame->eapol_key_iv */
cipher = l_cipher_new(L_CIPHER_ARC4, kek, 16);
break;
case EAPOL_KEY_DESCRIPTOR_VERSION_HMAC_SHA1_AES:
case EAPOL_KEY_DESCRIPTOR_VERSION_AES_128_CMAC_AES:
cipher = l_cipher_new(L_CIPHER_AES, kek, 16);
break;
default:
return NULL;
};
buf = l_new(uint8_t, key_data_len);
ret = l_cipher_decrypt(cipher, frame->key_data, buf, key_data_len);
l_cipher_free(cipher);
if (!ret) {
l_free(buf);
return NULL;
}
return buf;
}
const struct eapol_key *eapol_key_validate(const uint8_t *frame, size_t len) const struct eapol_key *eapol_key_validate(const uint8_t *frame, size_t len)
{ {
const struct eapol_key *ek; const struct eapol_key *ek;

3
src/eapol.h
View File

@ -96,6 +96,9 @@ struct eapol_key {
bool eapol_calculate_mic(const uint8_t *kck, const struct eapol_key *frame, bool eapol_calculate_mic(const uint8_t *kck, const struct eapol_key *frame,
uint8_t *mic); uint8_t *mic);
uint8_t *eapol_decrypt_key_data(const uint8_t *kek,
const struct eapol_key *frame);
const struct eapol_key *eapol_key_validate(const uint8_t *frame, size_t len); const struct eapol_key *eapol_key_validate(const uint8_t *frame, size_t len);
const struct eapol_key *eapol_verify_ptk_1_of_4(const uint8_t *frame, const struct eapol_key *eapol_verify_ptk_1_of_4(const uint8_t *frame,