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Showing content from https://rubydoc.info/github/cryptosphere/rbnacl/RbNaCl/Signatures/Ed25519/VerifyKey below:

VerifyKey – Documentation for cryptosphere/rbnacl (main) – RubyDoc.info

The public key counterpart to an Ed25519 SigningKey for producing digital signatures. Like the name says, VerifyKeys can be used to verify that a given digital signature is authentic.

For more information on the Ed25519 digital signature system, please see the SigningKey documentation.

• .signature_bytes ⇒ Integer

  The size of signatures verified by the VerifyKey class.

• #initialize(key) ⇒ RbNaCl::VerifyKey constructor

  Create a new VerifyKey object from a public key.

• #primitive ⇒ Symbol

  The crypto primitive this VerifyKey class uses for signatures.

• #signature_bytes ⇒ Integer

  The size of signatures verified by the VerifyKey instance.

• #to_bytes ⇒ String

  Return the raw key in byte format.

• #to_curve25519_public_key ⇒ RbNaCl::PublicKey

  Return a new curve25519 (x25519) public key converted from this key.

• #verify(signature, message) ⇒ Boolean

  Verify a signature for a given message.

• #verify_attached(signed_message) ⇒ Boolean

  Verify a signature for a given signed message.

sodium_constant, sodium_function, sodium_function_with_return_code, sodium_primitive, sodium_type

#inspect, #to_s, #to_str

#<=>, #==

Create a new VerifyKey object from a public key.

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# File 'lib/rbnacl/signatures/ed25519/verify_key.rb', line 35

def initialize(key)
  @key = key.to_str
  Util.check_length(@key, Ed25519::VERIFYKEYBYTES, "key")
end

The size of signatures verified by the VerifyKey class

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# File 'lib/rbnacl/signatures/ed25519/verify_key.rb', line 96

def self.signature_bytes
  Ed25519::SIGNATUREBYTES
end

The crypto primitive this VerifyKey class uses for signatures

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# File 'lib/rbnacl/signatures/ed25519/verify_key.rb', line 89

def primitive
  self.class.primitive
end

The size of signatures verified by the VerifyKey instance

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# File 'lib/rbnacl/signatures/ed25519/verify_key.rb', line 103

def signature_bytes
  Ed25519::SIGNATUREBYTES
end

Return the raw key in byte format

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# File 'lib/rbnacl/signatures/ed25519/verify_key.rb', line 82

def to_bytes
  @key
end

Verify a signature for a given message

Raises if the signature is invalid.

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# File 'lib/rbnacl/signatures/ed25519/verify_key.rb', line 51

def verify(signature, message)
  signature = signature.to_str
  Util.check_length(signature, signature_bytes, "signature")
  verify_attached(signature + message)
end

Verify a signature for a given signed message

Raises if the signature is invalid.

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# File 'lib/rbnacl/signatures/ed25519/verify_key.rb', line 66

def verify_attached(signed_message)
  raise LengthError, "Signed message can not be nil" if signed_message.nil?
  raise LengthError, "Signed message can not be shorter than a signature" if signed_message.bytesize <= signature_bytes

  buffer = Util.zeros(signed_message.bytesize)
  buffer_len = Util.zeros(FFI::Type::LONG_LONG.size)

  success = self.class.sign_ed25519_open(buffer, buffer_len, signed_message, signed_message.bytesize, @key)
  raise(BadSignatureError, "signature was forged/corrupt") unless success

  true
end

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