Generate a random secret key by using the Win32 API. Raises LoadError if the current platform cannot make use of the Win32 API. Raises SystemCallError if some other error occured.

Source Code

# File rails_generator/secret_key_generator.rb, line 28
def generate_secret_with_win32_api
  # Following code is based on David Garamond's GUID library for Ruby.
  require 'Win32API'

  crypt_acquire_context = Win32API.new("advapi32", "CryptAcquireContext",
                                       'PPPII', 'L')
  crypt_gen_random = Win32API.new("advapi32", "CryptGenRandom",
                                  'LIP', 'L')
  crypt_release_context = Win32API.new("advapi32", "CryptReleaseContext",
                                     'LI', 'L')
  prov_rsa_full       = 1
  crypt_verifycontext = 0xF0000000

  hProvStr = " " * 4
  if crypt_acquire_context.call(hProvStr, nil, nil, prov_rsa_full,
                                crypt_verifycontext) == 0
    raise SystemCallError, "CryptAcquireContext failed: #{lastWin32ErrorMessage}"
  end
  hProv, = hProvStr.unpack('L')
  bytes = " " * 64
  if crypt_gen_random.call(hProv, bytes.size, bytes) == 0
    raise SystemCallError, "CryptGenRandom failed: #{lastWin32ErrorMessage}"
  end
  if crypt_release_context.call(hProv, 0) == 0
    raise SystemCallError, "CryptReleaseContext failed: #{lastWin32ErrorMessage}"
  end
  bytes.unpack("H*")[0]
end