Class: Digest::HMAC

Inherits:

Class

• Object
• Class
• Digest::HMAC

show all

Defined in:

lib/digest/hmac.rb

Instance Method Summary (collapse)

• - (Object) block_length
• - (Object) digest_length
• - (HMAC) initialize(key, digester) constructor

  A new instance of HMAC.

• - (Object) initialize_copy(other)
• - (Object) inspect
• - (Object) reset
• - (Object) update(text) (also: #<<)

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# File 'lib/digest/hmac.rb', line 44

def initialize(key, digester)
  @md = digester.new

  block_len = @md.block_length

  if key.bytesize > block_len
    key = @md.digest(key)
  end

  ipad = Array.new(block_len).fill(0x36)
  opad = Array.new(block_len).fill(0x5c)

  key.bytes.each_with_index { |c, i|
    ipad[i] ^= c
    opad[i] ^= c
  }

  @key = key.freeze
  @ipad = ipad.inject('') { |s, c| s << c.chr }.freeze
  @opad = opad.inject('') { |s, c| s << c.chr }.freeze
  @md.update(@ipad)
end

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# File 'lib/digest/hmac.rb', line 95

def block_length
  @md.block_length
end

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# File 'lib/digest/hmac.rb', line 91

def digest_length
  @md.digest_length
end

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# File 'lib/digest/hmac.rb', line 67

def initialize_copy(other)
  @md = other.instance_eval { @md.clone }
end

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# File 'lib/digest/hmac.rb', line 99

def inspect
  sprintf('#<%s: key=%s, digest=%s>', self.class.name, @key.inspect, @md.inspect.sub(/^\#<(.*)>$/) { $1 });
end

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# File 'lib/digest/hmac.rb', line 77

def reset
  @md.reset
  @md.update(@ipad)
  self
end

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# File 'lib/digest/hmac.rb', line 71

def update(text)
  @md.update(text)
  self
end