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curve25519

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--HG--
branch : ecc
This commit is contained in:
Matt Johnston
2013-11-08 23:11:43 +08:00
parent cfac8435a7
commit 0162c116da
11 changed files with 964 additions and 72 deletions
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63
svr-kex.c
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@@ -52,15 +52,22 @@ void recv_msg_kexdh_init() {
dropbear_exit("Premature kexdh_init message received");
}
if (IS_NORMAL_DH(ses.newkeys->algo_kex)) {
m_mp_init(&dh_e);
if (buf_getmpint(ses.payload, &dh_e) != DROPBEAR_SUCCESS) {
dropbear_exit("Failed to get kex value");
}
} else {
#ifdef DROPBEAR_ECDH
ecdh_qs = buf_getstringbuf(ses.payload);
switch (ses.newkeys->algo_kex->mode) {
case DROPBEAR_KEX_NORMAL_DH:
m_mp_init(&dh_e);
if (buf_getmpint(ses.payload, &dh_e) != DROPBEAR_SUCCESS) {
dropbear_exit("Bad kex value");
}
break;
case DROPBEAR_KEX_ECDH:
case DROPBEAR_KEX_CURVE25519:
#if defined(DROPBEAR_ECDH) || defined(DROPBEAR_CURVE25519)
ecdh_qs = buf_getstringbuf(ses.payload);
if (ses.payload->pos != ses.payload->len) {
dropbear_exit("Bad kex value");
}
#endif
break;
}
send_msg_kexdh_reply(&dh_e, ecdh_qs);
@@ -92,22 +99,38 @@ static void send_msg_kexdh_reply(mp_int *dh_e, buffer *ecdh_qs) {
buf_put_pub_key(ses.writepayload, svr_opts.hostkey,
ses.newkeys->algo_hostkey);
if (IS_NORMAL_DH(ses.newkeys->algo_kex)) {
// Normal diffie-hellman
struct kex_dh_param * dh_param = gen_kexdh_param();
kexdh_comb_key(dh_param, dh_e, svr_opts.hostkey);
switch (ses.newkeys->algo_kex->mode) {
case DROPBEAR_KEX_NORMAL_DH:
{
struct kex_dh_param * dh_param = gen_kexdh_param();
kexdh_comb_key(dh_param, dh_e, svr_opts.hostkey);
/* put f */
buf_putmpint(ses.writepayload, &dh_param->pub);
free_kexdh_param(dh_param);
} else {
/* put f */
buf_putmpint(ses.writepayload, &dh_param->pub);
free_kexdh_param(dh_param);
}
break;
case DROPBEAR_KEX_ECDH:
#ifdef DROPBEAR_ECDH
struct kex_ecdh_param *ecdh_param = gen_kexecdh_param();
kexecdh_comb_key(ecdh_param, ecdh_qs, svr_opts.hostkey);
{
struct kex_ecdh_param *ecdh_param = gen_kexecdh_param();
kexecdh_comb_key(ecdh_param, ecdh_qs, svr_opts.hostkey);
buf_put_ecc_raw_pubkey_string(ses.writepayload, &ecdh_param->key);
free_kexecdh_param(ecdh_param);
buf_put_ecc_raw_pubkey_string(ses.writepayload, &ecdh_param->key);
free_kexecdh_param(ecdh_param);
}
#endif
break;
case DROPBEAR_KEX_CURVE25519:
#ifdef DROPBEAR_CURVE25519
{
struct kex_curve25519_param *param = gen_kexecdh_param();
kexcurve25519_comb_key(param, ecdh_qs, svr_opts.hostkey);
buf_putstring(ses.writepayload, param->priv, CURVE25519_LEN);
free_kexcurve25519_param(param);
}
#endif
break;
}
/* calc the signature */