Class: CryptoToolchain::Utilities::SHA1

Inherits:
Object
  • Object
show all
Defined in:
lib/crypto_toolchain/utilities/sha1.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(message) ⇒ SHA1

Returns a new instance of SHA1.



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# File 'lib/crypto_toolchain/utilities/sha1.rb', line 21

def initialize(message)
  @original = message
end

Class Method Details

.bindigest(str, state: INITIAL_STATE, append_length: 0) ⇒ Object 



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# File 'lib/crypto_toolchain/utilities/sha1.rb', line 10

def bindigest(str, state: INITIAL_STATE, append_length: 0)
  CryptoToolchain::Utilities::SHA1.new(str).bindigest(state: state, append_length: append_length)
end

.digest ⇒ Object 



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# File 'lib/crypto_toolchain/utilities/sha1.rb', line 13

def bindigest(str, state: INITIAL_STATE, append_length: 0)
  CryptoToolchain::Utilities::SHA1.new(str).bindigest(state: state, append_length: append_length)
end

.hexdigest(str, state: INITIAL_STATE, append_length: 0) ⇒ Object 



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# File 'lib/crypto_toolchain/utilities/sha1.rb', line 6

def hexdigest(str, state: INITIAL_STATE, append_length: 0 )
  CryptoToolchain::Utilities::SHA1.new(str).hexdigest(state: state, append_length: append_length)
end

.padding(str) ⇒ Object 



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# File 'lib/crypto_toolchain/utilities/sha1.rb', line 15

def padding(str)
  num_null_pad = (56 - (str.bytesize + 1) ) % 64
  0x80.chr + (0.chr * num_null_pad) + [str.bytesize * 8].pack("Q>")
end

Instance Method Details

#bindigest(state: INITIAL_STATE, append_length: 0) ⇒ Object Also known as: digest 



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# File 'lib/crypto_toolchain/utilities/sha1.rb', line 29

def bindigest(state: INITIAL_STATE, append_length: 0)
  h = registers_from(state).dup

  length = original.bytesize + append_length

  # while (string.size % 64) != 56
  num_null_pad = (56 - (length + 1) ) % 64
  padding = 0x80.chr + (0.chr * num_null_pad) + [length * 8].pack("Q>")

  (original + padding).in_blocks(64).each do |_block|
    w = _block.unpack("L>16")
    (16..79).each do |i|
      w[i] = (w[i-3] ^ w[i-8] ^ w[i-14] ^ w[i-16]).lrot(1)
    end

    a, b, c, d, e = h

    (0..79).each do |i|
      func, k = f_and_k_for(i)
      f = func.call(b, c, d)
      temp = (a.lrot(5) + f + e + k + w[i]) & 0xffffffff
      e = d
      d = c
      c = b.lrot(30)
      b = a
      a = temp
    end

    [a, b, c, d, e].each_with_index do |val, i|
      h[i] = (h[i] + val) & 0xffffffff
    end
  end
  h.pack("L>5")
end

#hexdigest(state: INITIAL_STATE, append_length: 0) ⇒ Object 



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# File 'lib/crypto_toolchain/utilities/sha1.rb', line 25

def hexdigest(state: INITIAL_STATE, append_length: 0)
  bindigest(state: state, append_length: append_length).unpack("H*").join
end