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eap-pwd: use ecc byte conversion API's

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This commit is contained in:
James Prestwood 2018-05-04 15:11:52 -07:00 committed by Denis Kenzior
parent db690ebe73
commit 2f0c37dae6
1 changed files with 11 additions and 31 deletions
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42
src/eap-pwd.c
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@ -154,26 +154,6 @@ static bool kdf(uint8_t *key, size_t key_len, const char *label,
return true;
}
/*
* Keys sent from server are all stored MSB first in memory. Before using
* these values with the math API's they need to be byte reversed as the
* math functions expect LSB first byte ordering. The same is true sending
* any other data back to the server, they keys/data must be reversed back
* to store MSB first.
*/
static void byte_reverse32(uint64_t *num64)
{
uint8_t *num = (uint8_t *) num64;
int i;
for (i = 0; i < 16; i++) {
uint8_t tmp = num[i];
num[i] = num[31 - i];
num[31 - i] = tmp;
}
}
static void eap_pwd_free(struct eap_state *eap)
{
struct eap_pwd_handle *pwd = eap_get_data(eap);
@ -314,7 +294,7 @@ static void eap_pwd_handle_id(struct eap_state *eap,
strlen("EAP-pwd Hunting And Pecking"),
pwd_value, 32);
byte_reverse32(pwd_value);
ecc_be2native(pwd_value);
if (ecc_compute_y(y_value, pwd_value)) {
l_info("computed y in %u tries", counter);
@ -389,9 +369,9 @@ static void eap_pwd_handle_commit(struct eap_state *eap,
memcpy(pwd->element_s.y, pkt + ECC_BYTES, ECC_BYTES);
memcpy(pwd->scalar_s, pkt + 64, ECC_BYTES);
byte_reverse32(pwd->element_s.x);
byte_reverse32(pwd->element_s.y);
byte_reverse32(pwd->scalar_s);
ecc_be2native(pwd->element_s.x);
ecc_be2native(pwd->element_s.y);
ecc_be2native(pwd->scalar_s);
if (!ecc_valid_point(&pwd->element_s))
goto invalid_point;
@ -434,9 +414,9 @@ static void eap_pwd_handle_commit(struct eap_state *eap,
goto invalid_point;
/* change peer into to MSB first byte ordering before sending back */
byte_reverse32(pwd->element_p.x);
byte_reverse32(pwd->element_p.y);
byte_reverse32(pwd->scalar_p);
ecc_native2be(pwd->element_p.x);
ecc_native2be(pwd->element_p.y);
ecc_native2be(pwd->scalar_p);
/* send element_p and scalar_p */
pos = resp + 5; /* header */
@ -502,10 +482,10 @@ static void eap_pwd_handle_confirm(struct eap_state *eap,
if (!ecc_valid_point(&kp))
goto invalid_point;
byte_reverse32(kp.x);
byte_reverse32(pwd->element_s.x);
byte_reverse32(pwd->element_s.y);
byte_reverse32(pwd->scalar_s);
ecc_native2be(kp.x);
ecc_native2be(pwd->element_s.x);
ecc_native2be(pwd->element_s.y);
ecc_native2be(pwd->scalar_s);
/*
* compute Confirm_P = H(kp | Element_P | Scalar_P |