/usr/lib/ruby/vendor_ruby/net/ssh/transport/kex/ecdh_sha2_nistp521.rb is in ruby-net-ssh 1:3.2.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | module Net; module SSH; module Transport; module Kex
# A key-exchange service implementing the "ecdh-sha2-nistp521"
# key-exchange algorithm. (defined in RFC 5656)
class EcdhSHA2NistP521 < EcdhSHA2NistP256
def digester
OpenSSL::Digest::SHA512
end
def curve_name
OpenSSL::PKey::EC::CurveNameAlias['nistp521']
end
end
end; end; end; end
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