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PPP, MPPE, merged get_new_key_from_sha() to mppe_rekey()

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get_new_key_from_sha() is only used in mppe_rekey(), merged
This commit is contained in:
Sylvain Rochet 2015-04-17 23:53:22 +02:00
parent 489760d2e3
commit f1cba8a0ea
1 changed files with 13 additions and 17 deletions
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30
src/netif/ppp/mppe.c
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@ -100,29 +100,25 @@ static const u8_t sha1_pad2[SHA1_PAD_SIZE] = {
0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2
};
/*
* Key Derivation, from RFC 3078, RFC 3079.
* Equivalent to Get_Key() for MS-CHAP as described in RFC 3079.
*/
static void get_new_key_from_sha(struct ppp_mppe_state * state)
{
sha1_context sha1;
sha1_starts(&sha1);
sha1_update(&sha1, state->master_key, state->keylen);
sha1_update(&sha1, (unsigned char *)sha1_pad1, SHA1_PAD_SIZE);
sha1_update(&sha1, state->session_key, state->keylen);
sha1_update(&sha1, (unsigned char *)sha1_pad2, SHA1_PAD_SIZE);
sha1_finish(&sha1, state->sha1_digest);
}
/*
* Perform the MPPE rekey algorithm, from RFC 3078, sec. 7.3.
* Well, not what's written there, but rather what they meant.
*/
static void mppe_rekey(struct ppp_mppe_state * state, int initial_key)
{
get_new_key_from_sha(state);
sha1_context sha1;
/*
* Key Derivation, from RFC 3078, RFC 3079.
* Equivalent to Get_Key() for MS-CHAP as described in RFC 3079.
*/
sha1_starts(&sha1);
sha1_update(&sha1, state->master_key, state->keylen);
sha1_update(&sha1, (unsigned char *)sha1_pad1, SHA1_PAD_SIZE);
sha1_update(&sha1, state->session_key, state->keylen);
sha1_update(&sha1, (unsigned char *)sha1_pad2, SHA1_PAD_SIZE);
sha1_finish(&sha1, state->sha1_digest);
if (!initial_key) {
arc4_setup(&state->arc4, state->sha1_digest, state->keylen);
MEMCPY(state->session_key, state->sha1_digest, state->keylen);