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Support ECDH key exchange using the 'curve25519' curve.

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This is the kex protocol id "curve25519-sha256@libssh.org", so called
because it's over the prime field of order 2^255 - 19.

Arithmetic in this curve is done using the Montgomery representation,
rather than the Weierstrass representation. So 'struct ec_curve' has
grown a discriminant field and a union of subtypes.
This commit is contained in:
Chris Staite
2015-05-09 15:02:52 +01:00
committed by Simon Tatham
parent 7d6bf4a6ca
commit 541abf9258
4 changed files with 934 additions and 258 deletions
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9
ssh.c
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@ -6845,14 +6845,7 @@ static void do_ssh2_transport(Ssh ssh, void *vin, int inlen,
ssh->kex->hash->text_name);
ssh->pkt_kctx = SSH2_PKTCTX_ECDHKEX;
s->eckey = NULL;
if (!strcmp(ssh->kex->name, "ecdh-sha2-nistp256")) {
s->eckey = ssh_ecdhkex_newkey(ec_p256());
} else if (!strcmp(ssh->kex->name, "ecdh-sha2-nistp384")) {
s->eckey = ssh_ecdhkex_newkey(ec_p384());
} else if (!strcmp(ssh->kex->name, "ecdh-sha2-nistp521")) {
s->eckey = ssh_ecdhkex_newkey(ec_p521());
}
s->eckey = ssh_ecdhkex_newkey(ssh->kex->name);
if (!s->eckey) {
bombout(("Unable to generate key for ECDH"));
crStopV;