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eapol: Add eapol_verify_mic

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This commit is contained in:
Denis Kenzior 2015-02-18 21:13:09 -06:00
parent 3c7bfe9e77
commit 6a4b75cf8d
2 changed files with 47 additions and 0 deletions
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46
src/eapol.c
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@ -67,6 +67,52 @@ bool eapol_calculate_mic(const uint8_t *kck, const struct eapol_key *frame,
} }
} }
bool eapol_verify_mic(const uint8_t *kck, const struct eapol_key *frame)
{
size_t frame_len = sizeof(struct eapol_key);
uint8_t mic[16];
struct iovec iov[3];
struct l_checksum *checksum = NULL;
iov[0].iov_base = (void *) frame;
iov[0].iov_len = offsetof(struct eapol_key, key_mic_data);
memset(mic, 0, sizeof(mic));
iov[1].iov_base = mic;
iov[1].iov_len = sizeof(mic);
iov[2].iov_base = ((void *) frame) +
offsetof(struct eapol_key, key_data_len);
iov[2].iov_len = frame_len - offsetof(struct eapol_key, key_data) +
L_BE16_TO_CPU(frame->key_data_len);
switch (frame->key_descriptor_version) {
case EAPOL_KEY_DESCRIPTOR_VERSION_HMAC_MD5_ARC4:
checksum = l_checksum_new_hmac(L_CHECKSUM_MD5, kck, 16);
break;
case EAPOL_KEY_DESCRIPTOR_VERSION_HMAC_SHA1_AES:
checksum = l_checksum_new_hmac(L_CHECKSUM_SHA1, kck, 16);
break;
case EAPOL_KEY_DESCRIPTOR_VERSION_AES_128_CMAC_AES:
checksum = l_checksum_new_cmac_aes(kck, 16);
break;
default:
return false;
}
if (checksum == NULL)
return false;
l_checksum_updatev(checksum, iov, 3);
l_checksum_get_digest(checksum, mic, 16);
l_free(checksum);
if (!memcmp(frame->key_mic_data, mic, 16))
return true;
return false;
}
uint8_t *eapol_decrypt_key_data(const uint8_t *kek, uint8_t *eapol_decrypt_key_data(const uint8_t *kek,
const struct eapol_key *frame) const struct eapol_key *frame)
{ {

1
src/eapol.h
View File

@ -95,6 +95,7 @@ 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);
bool eapol_verify_mic(const uint8_t *kck, const struct eapol_key *frame);
uint8_t *eapol_decrypt_key_data(const uint8_t *kek, uint8_t *eapol_decrypt_key_data(const uint8_t *kek,
const struct eapol_key *frame); const struct eapol_key *frame);