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module SSHData
module PublicKey
class Base
attr_reader :algo
def initialize(**kwargs)
@algo = kwargs[:algo]
end
# Calculate the fingerprint of this public key.
#
# md5: - Bool of whether to generate an MD5 fingerprint instead of the
# default SHA256.
#
# Returns a String fingerprint.
def fingerprint(md5: false)
if md5
# colon separated, hex encoded md5 digest
OpenSSL::Digest::MD5.digest(rfc4253).unpack("H2" * 16).join(":")
else
# base64 encoded sha256 digest with b64 padding stripped
Base64.strict_encode64(OpenSSL::Digest::SHA256.digest(rfc4253))[0...-1]
end
end
# Make an SSH signature.
#
# signed_data - The String message over which to calculated the signature.
#
# Returns a binary String signature.
def sign(signed_data)
raise "implement me"
end
# Verify an SSH signature.
#
# signed_data - The String message that the signature was calculated over.
# signature - The binary String signature with SSH encoding.
#
# Returns boolean.
def verify(signed_data, signature)
raise "implement me"
end
# RFC4253 binary encoding of the public key.
#
# Returns a binary String.
def rfc4253
raise "implement me"
end
# OpenSSH public key in authorized_keys format (see sshd(8) manual page).
#
# comment - Optional String comment to append.
#
# Returns a String key.
def openssh(comment: nil)
[algo, Base64.strict_encode64(rfc4253), comment].compact.join(" ")
end
# Is this public key equal to another public key?
#
# other - Another SSHData::PublicKey::Base instance to compare with.
#
# Returns boolean.
def ==(other)
other.class == self.class
end
end
end
end
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