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3 Commits

Author SHA1 Message Date
Chris Staite
76a4b576e5 Support public keys using the "ssh-ed25519" method. 
This introduces a third system of elliptic curve representation and
arithmetic, namely Edwards form.
 2015-05-09 15:14:35 +01:00
Chris Staite
541abf9258 Support ECDH key exchange using the 'curve25519' curve. 
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.
 2015-05-09 15:07:14 +01:00
Chris Staite
2bf8688355 Elliptic-curve cryptography support. 
This provides support for ECDSA public keys, for both hosts and users,
and also ECDH key exchange. Supported curves are currently just the
three NIST curves required by RFC 5656.
 2014-11-02 18:16:54 +00:00