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require 'net/ssh/transport/kex/abstract5656'
module Net
module SSH
module Transport
module Kex
# A key-exchange service implementing the "ecdh-sha2-nistp256"
# key-exchange algorithm. (defined in RFC 5656)
class EcdhSHA2NistP256 < Abstract5656
def digester
OpenSSL::Digest::SHA256
end
def curve_name
OpenSSL::PKey::EC::CurveNameAlias['nistp256']
end
private
def generate_key # :nodoc:
OpenSSL::PKey::EC.generate(curve_name)
end
# compute shared secret from server's public key and client's private key
def compute_shared_secret(server_ecdh_pubkey)
pk = OpenSSL::PKey::EC::Point.new(OpenSSL::PKey::EC.new(curve_name).group,
OpenSSL::BN.new(server_ecdh_pubkey, 2))
OpenSSL::BN.new(ecdh.dh_compute_key(pk), 2)
end
## string Q_C, client's ephemeral public key octet string
def ecdh_public_key_bytes
ecdh.public_key.to_bn.to_s(2)
end
end
end
end
end
end
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