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Contents
# frozen_string_literal: true
module X25519
# X25519 public keys and shared secrets
#
# Montgomery-u coordinates of points on the elliptic curve used by X25519
# (a.k.a. Curve25519)
class MontgomeryU
# Create an object representing a Montgomery-u coordinate from a bytestring
#
# @param bytes [String] 32-byte compressed Montgomery-u coordinate
def initialize(bytes)
X25519.validate_key_bytes(bytes)
# The point located at a Montgomery-u coordinate of zero always returns
# the point at zero regardless of which scalar it's multiplied with
raise InvalidKeyError, "degenerate public key" if bytes == ("\0" * KEY_SIZE)
@bytes = bytes
end
# Return a compressed Montgomery-u coordinate serialized as a bytestring
#
# @return [String] bytestring serialization of a Montgomery-u coordinate
def to_bytes
@bytes
end
# Show hex representation of serialized coordinate in string inspection
def inspect
"#<#{self.class}:#{@bytes.unpack('H*').first}>"
end
end
end
Version data entries
7 entries across 7 versions & 2 rubygems