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eapol: Implement eapol_encrypt_key_data

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Add a function to do the inverse of eapol_decrypt_key_data to be used in
eapol server.  Only AES-based versions supported.
This commit is contained in:
Andrew Zaborowski 2017-08-31 04:04:50 +02:00 committed by Denis Kenzior
parent da029bead8
commit 66325e8c9b
2 changed files with 40 additions and 0 deletions
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37
src/eapol.c
View File

@ -311,6 +311,43 @@ error:
return NULL;
}
/*
* Pad and encrypt the plaintext Key Data contents in @key_data using
* the encryption scheme required by @out_frame->key_descriptor_version,
* write results to @out_frame->key_data and @out_frame->key_data_len.
*
* Note that for efficiency @key_data is being modified, including in
* case of failure, so it must be sufficiently larger than @key_data_len.
*/
bool eapol_encrypt_key_data(const uint8_t *kek, uint8_t *key_data,
size_t key_data_len,
struct eapol_key *out_frame)
{
switch (out_frame->key_descriptor_version) {
case EAPOL_KEY_DESCRIPTOR_VERSION_HMAC_MD5_ARC4:
/* Not supported */
return false;
case EAPOL_KEY_DESCRIPTOR_VERSION_HMAC_SHA1_AES:
case EAPOL_KEY_DESCRIPTOR_VERSION_AES_128_CMAC_AES:
if (key_data_len < 16 || key_data_len % 8)
key_data[key_data_len++] = 0xdd;
while (key_data_len < 16 || key_data_len % 8)
key_data[key_data_len++] = 0x00;
if (!aes_wrap(kek, key_data, key_data_len, out_frame->key_data))
return false;
key_data_len += 8;
break;
}
out_frame->key_data_len = L_CPU_TO_BE16(key_data_len);
return true;
}
const struct eapol_key *eapol_key_validate(const uint8_t *frame, size_t len)
{
const struct eapol_key *ek;

3
src/eapol.h
View File

@ -132,6 +132,9 @@ bool eapol_verify_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 *decrypted_size);
bool eapol_encrypt_key_data(const uint8_t *kek, uint8_t *key_data,
size_t key_data_len,
struct eapol_key *out_frame);
const struct eapol_key *eapol_key_validate(const uint8_t *frame, size_t len);