Module: LibEcp

Extended by:
FFI::Library
Defined in:
lib/libecp.rb

Constant Summary collapse

@@pb =

Create the buffers

FFI::MemoryPointer.new(:char, 29)
@@ab = 
FFI::MemoryPointer.new(:char, 29)
@@gb = 
FFI::MemoryPointer.new(:char, 29*3)
@@nb = 
FFI::MemoryPointer.new(:char, 29)

Class Method Summary collapse

Class Method Details

.gen_nonce ⇒ Object 



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# File 'lib/libecp.rb', line 34

def self.gen_nonce
  SecureRandom.random_bytes(16)
end

.gen_pub(priv_key) ⇒ Object

Generates public key from private key



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# File 'lib/libecp.rb', line 58

def self.gen_pub(priv_key)
  qbuf = FFI::MemoryPointer.new(:char, 29*3)
  zbuf = FFI::MemoryPointer.new(:char, 29)
  zbuf.put_bytes(1, priv_key)
  LibEcp::ecp_pubkey_u8 qbuf, @@pb, @@ab, @@gb, zbuf, 29

  [Base64.encode64(qbuf.get_bytes(1, 28)).rstrip, Base64.encode64(qbuf.get_bytes(30, 28)).rstrip]
end

.gen_uid(user_id) ⇒ Object

Generates user id as a bytestring



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# File 'lib/libecp.rb', line 39

def self.gen_uid(user_id)
  (
    (user_id >> 56 & 0xFF).chr +
      (user_id >> 48 & 0xFF).chr +
      (user_id >> 40 & 0xFF).chr +
      (user_id >> 32 & 0xFF).chr +
      (user_id >> 24 & 0xFF).chr +
      (user_id >> 16 & 0xFF).chr +
      (user_id >> 8 & 0xFF).chr +
      (user_id & 0xFF).chr
  ).encode("ASCII-8BIT")
end

.private_key(uid, pass) ⇒ Object

Generates users private key, Arguments: user id bytestring (from gen_uid), password String



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# File 'lib/libecp.rb', line 53

def self.private_key(uid, pass)
  OpenSSL::Digest.digest("SHA224", uid + pass.encode("UTF-8").force_encoding("ASCII-8BIT"))
end

.sign(user_id, snonce, cnonce, priv_key) ⇒ Object

Arguments: user id, server nonce, client nonce, users private key. Returns an array with the two coordinates that is the signature.



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# File 'lib/libecp.rb', line 69

def self.sign(user_id, snonce, cnonce, priv_key)
  rbuf = FFI::MemoryPointer.new(:char, 29)
  sbuf = FFI::MemoryPointer.new(:char, 29)
  dbuf = FFI::MemoryPointer.new(:char, 29)
  dbuf.put_bytes(1, priv_key)
  zbuf = FFI::MemoryPointer.new(:char, 29)
  zbuf.put_bytes(1, OpenSSL::Digest.digest("SHA224", user_id + snonce + cnonce))
  LibEcp::ecp_sign_u8 rbuf, sbuf, @@pb, @@ab, @@gb, @@nb, dbuf, zbuf, 29

  [rbuf.get_bytes(1, 28), sbuf.get_bytes(1, 28)]
end