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Showing content from https://rubydoc.info/github/cryptosphere/rbnacl/RbNaCl/HMAC/SHA256 below:

SHA256 – Documentation for cryptosphere/rbnacl (main) – RubyDoc.info

Inherits:

Auth

• Object
• Auth
• RbNaCl::HMAC::SHA256

show all

Extended by:

Sodium

Defined in:

lib/rbnacl/hmac/sha256.rb

Computes an authenticator as HMAC-SHA-256

The authenticator can be used at a later time to verify the provenance of the message by recomputing the HMAC over the message and then comparing it to the provided authenticator. The class provides methods for generating signatures and also has a constant-time implementation for checking them.

This is a secret key authenticator, i.e. anyone who can verify signatures can also create them.

Classes: SHA256State, State

Auth::BYTES, Auth::KEYBYTES

• #digest ⇒ String

  Return the authenticator, as raw bytes.

• #hexdigest ⇒ String

  Return the authenticator, as hex string.

• #initialize(key) ⇒ SHA256 constructor

  Create instance without checking key length.

• #update(message) ⇒ Object

  Compute authenticator for message.

primitive, sodium_constant, sodium_function, sodium_function_with_return_code, sodium_primitive, sodium_type

auth, #auth, #key_bytes, key_bytes, #primitive, #tag_bytes, tag_bytes, #verify, verify

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# File 'lib/rbnacl/hmac/sha256.rb', line 43

def initialize(key)
  @key = Util.check_hmac_key(key, "#{self.class} key")
  @state = State.new
  @authenticator = Util.zeros(tag_bytes)

  self.class.auth_hmacsha256_init(@state, key, key.bytesize)
end

Return the authenticator, as raw bytes

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# File 'lib/rbnacl/hmac/sha256.rb', line 64

def digest
  @authenticator
end

Return the authenticator, as hex string

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# File 'lib/rbnacl/hmac/sha256.rb', line 71

def hexdigest
  @authenticator.unpack("H*").last
end

Compute authenticator for message

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# File 'lib/rbnacl/hmac/sha256.rb', line 54

def update(message)
  self.class.auth_hmacsha256_update(@state, message, message.bytesize)
  self.class.auth_hmacsha256_final(@state.clone, @authenticator)

  hexdigest
end

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