Module: Ed25519

Defined in:
lib/ed25519.rb,
lib/ed25519/version.rb,
lib/ed25519/verify_key.rb,
lib/ed25519/signing_key.rb,
ext/ed25519_ref10/ed25519_ref10.c

Overview

The Ed25519 digital signatre algorithm rubocop:disable Metrics/LineLength

Defined Under Namespace

Modules: Provider Classes: SigningKey, VerifyKey

Constant Summary collapse

KEY_SIZE =

Size of an Ed25519 key (public or private) in bytes

32
SIGNATURE_SIZE =

Size of an Ed25519 signature in bytes

64
VerifyError =

Raised when a signature fails to verify

Class.new(StandardError)
SelfTestFailure =

Raised when the built-in self-test fails

Class.new(StandardError)
VERSION =
"1.2.4"

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.providerObject

Obtain the backend provider module used to perform signatures


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# File 'lib/ed25519.rb', line 26

def provider
  @provider
end

Class Method Details

.self_testObject

Perform a self-test to ensure the selected provider is working

Raises:


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# File 'lib/ed25519.rb', line 46

def self_test
  signature_key = Ed25519::SigningKey.new("A" * 32)
  raise SelfTestFailure, "failed to generate verify key correctly" unless signature_key.verify_key.to_bytes.unpack("H*").first == "db995fe25169d141cab9bbba92baa01f9f2e1ece7df4cb2ac05190f37fcc1f9d"

  message = "crypto libraries should self-test on boot"
  signature = signature_key.sign(message)
  raise SelfTestFailure, "failed to generate correct signature" unless signature.unpack("H*").first == "c62c12a3a6cbfa04800d4be81468ef8aecd152a6a26a81d91257baecef13ba209531fe905a843e833c8b71cee04400fa2af3a29fef1152ece470421848758d0a"

  verify_key = signature_key.verify_key
  raise SelfTestFailure, "failed to verify a valid signature" unless verify_key.verify(signature, message)

  bad_signature = signature[0...63] + "X"
  ex = nil

  # rubocop:disable Lint/HandleExceptions
  begin
    verify_key.verify(bad_signature, message)
  rescue Ed25519::VerifyError => ex
  end
  # rubocop:enable Lint/HandleExceptions

  raise SelfTestFailure, "failed to detect an invalid signature" unless ex.is_a?(Ed25519::VerifyError)
end

.validate_key_bytes(key_bytes) ⇒ Object

Ensure a serialized key meets the requirements

Raises:

  • (TypeError)

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# File 'lib/ed25519.rb', line 39

def validate_key_bytes(key_bytes)
  raise TypeError, "expected String, got #{key_bytes.class}" unless key_bytes.is_a?(String)
  return true if key_bytes.bytesize == KEY_SIZE
  raise ArgumentError, "expected #{KEY_SIZE}-byte String, got #{key_bytes.bytesize}"
end