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# frozen_string_literal: true
module Ed25519
# Public key for verifying digital signatures
class VerifyKey
# Create a Ed25519::VerifyKey from its serialized Twisted Edwards representation
#
# @param key [String] 32-byte string representing a serialized public key
def initialize(key)
Ed25519.validate_key_bytes(key)
@key_bytes = key
end
# Verify an Ed25519 signature against the message
#
# @param signature [String] 64-byte string containing an Ed25519 signature
# @param message [String] string containing message to be verified
#
# @raise Ed25519::VerifyError signature verification failed
#
# @return [true] message verified successfully
def verify(signature, message)
if signature.length != SIGNATURE_SIZE
raise ArgumentError, "expected #{SIGNATURE_SIZE} byte signature, got #{signature.length}"
end
return true if Ed25519.provider.verify(@key_bytes, signature, message)
raise VerifyError, "signature verification failed!"
end
# Return a compressed twisted Edwards coordinate representing the public key
#
# @return [String] bytestring serialization of this public key
def to_bytes
@key_bytes
end
alias to_str to_bytes
# Show hex representation of serialized coordinate in string inspection
def inspect
"#<#{self.class}:#{@key_bytes.unpack1('H*')}>"
end
end
end
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