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Showing content from https://rubydoc.info/github/cryptosphere/rbnacl/RbNaCl/Auth below:

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

Inherits:

Object

• Object
• RbNaCl::Auth

show all

Defined in:

lib/rbnacl/auth.rb

Secret Key Authenticators

These provide a means of verifying the integrity of a message, but only with the knowledge of a shared key. This can be a preshared key, or one that is derived through some cryptographic protocol.

KEYBYTES =

Number of bytes in a valid key

0

BYTES =

Number of bytes in a valid authenticator

0

• .auth(key, message) ⇒ String

  Compute authenticator for message.

• .key_bytes ⇒ Integer

  The number of key bytes for this Auth class.

• .tag_bytes ⇒ Integer

  The number bytes in the tag or authenticator from this Auth class.

• .verify(key, authenticator, message) ⇒ Boolean

  Verifies the given authenticator with the message.

• #auth(message) ⇒ String

  Compute authenticator for message.

• #initialize(key) ⇒ Auth constructor

  A new authenticator, ready for auth and verification.

• #key_bytes ⇒ Integer

  The number of key bytes for this Auth instance.

• #primitive ⇒ Symbol

  The crypto primitive for this authenticator instance.

• #tag_bytes ⇒ Integer

  The number of bytes in the tag or authenticator for this Auth instance.

• #verify(authenticator, message) ⇒ Boolean

  Verifies the given authenticator with the message.

A new authenticator, ready for auth and verification

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# File 'lib/rbnacl/auth.rb', line 23

def initialize(key)
  @key = Util.check_string(key, key_bytes, "#{self.class} key")
end

Compute authenticator for message

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# File 'lib/rbnacl/auth.rb', line 33

def self.auth(key, message)
  new(key).auth(message)
end

The number of key bytes for this Auth class

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# File 'lib/rbnacl/auth.rb', line 88

def self.key_bytes
  self::KEYBYTES
end

The number bytes in the tag or authenticator from this Auth class

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# File 'lib/rbnacl/auth.rb', line 102

def self.tag_bytes
  self::BYTES
end

Verifies the given authenticator with the message.

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# File 'lib/rbnacl/auth.rb', line 47

def self.verify(key, authenticator, message)
  new(key).verify(authenticator, message)
end

Compute authenticator for message

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# File 'lib/rbnacl/auth.rb', line 56

def auth(message)
  authenticator = Util.zeros(tag_bytes)
  message = message.to_str
  compute_authenticator(authenticator, message)
  authenticator
end

The number of key bytes for this Auth instance

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# File 'lib/rbnacl/auth.rb', line 95

def key_bytes
  self.class.key_bytes
end

The crypto primitive for this authenticator instance

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# File 'lib/rbnacl/auth.rb', line 81

def primitive
  self.class.primitive
end

The number of bytes in the tag or authenticator for this Auth instance

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# File 'lib/rbnacl/auth.rb', line 109

def tag_bytes
  self.class.tag_bytes
end

Verifies the given authenticator with the message.

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# File 'lib/rbnacl/auth.rb', line 72

def verify(authenticator, message)
  auth = authenticator.to_s
  Util.check_length(auth, tag_bytes, "Provided authenticator")
  verify_message(auth, message) || raise(BadAuthenticatorError, "Invalid authenticator provided, message is corrupt")
end

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