old_contents: # Copyright (c) 2014-2015, Jan Varho
  #
  # Permission to use, copy, modify, and/or distribute this software for any
  # purpose with or without fee is hereby granted, provided that the above
  # copyright notice and this permission notice appear in all copies.
  #
  # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  
  """Common constants and functions used by scrypt implementations"""
  
  import numbers
  
  
  SCRYPT_MCF_PREFIX_7 = b'$7$'
  SCRYPT_MCF_PREFIX_s1 = b'$s1$'
  SCRYPT_MCF_PREFIX_DEFAULT = b'$s1$'
  SCRYPT_MCF_PREFIX_ANY = None
  
  SCRYPT_N = 1<<14
  SCRYPT_r = 8
  SCRYPT_p = 1
  
  # The last one differs from libscrypt defaults, but matches the 'interactive'
  # work factor from the original paper. For long term storage where runtime of
  # key derivation is not a problem, you could use 16 as in libscrypt or better
  # yet increase N if memory is plentiful.
  
  xrange = xrange if 'xrange' in globals() else range
  
  def check_args(password, salt, N, r, p, olen=64):
      if not isinstance(password, bytes):
          raise TypeError('password must be a byte string')
      if not isinstance(salt, bytes):
          raise TypeError('salt must be a byte string')
      if not isinstance(N, numbers.Integral):
          raise TypeError('N must be an integer')
      if not isinstance(r, numbers.Integral):
          raise TypeError('r must be an integer')
      if not isinstance(p, numbers.Integral):
          raise TypeError('p must be an integer')
      if not isinstance(olen, numbers.Integral):
          raise TypeError('length must be an integer')
      if N > 2**63:
          raise ValueError('N cannot be larger than 2**63')
      if (N & (N - 1)) or N < 2:
          raise ValueError('N must be a power of two larger than 1')
      if r <= 0:
          raise ValueError('r must be positive')
      if p <= 0:
          raise ValueError('p must be positive')
      if r * p >= 2**30:
          raise ValueError('r * p must be less than 2 ** 30')
      if olen <= 0:
          raise ValueError('length must be positive')
  
  
new_contents: # Copyright (c) 2014-2018, Jan Varho
  #
  # Permission to use, copy, modify, and/or distribute this software for any
  # purpose with or without fee is hereby granted, provided that the above
  # copyright notice and this permission notice appear in all copies.
  #
  # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  
  """Common constants and functions used by scrypt implementations"""
  
  import numbers
  
  
  SCRYPT_MCF_PREFIX_7 = b'$7$'
  SCRYPT_MCF_PREFIX_s1 = b'$s1$'
  SCRYPT_MCF_PREFIX_DEFAULT = b'$s1$'
  SCRYPT_MCF_PREFIX_ANY = None
  
  SCRYPT_N = 1<<14
  SCRYPT_r = 8
  SCRYPT_p = 1
  
  # The last one differs from libscrypt defaults, but matches the 'interactive'
  # work factor from the original paper. For long term storage where runtime of
  # key derivation is not a problem, you could use 16 as in libscrypt or better
  # yet increase N if memory is plentiful.
  
  try:
      xrange = xrange
  except:
      xrange = range
  
  def check_args(password, salt, N, r, p, olen=64):
      if not isinstance(password, bytes):
          raise TypeError('password must be a byte string')
      if not isinstance(salt, bytes):
          raise TypeError('salt must be a byte string')
      if not isinstance(N, numbers.Integral):
          raise TypeError('N must be an integer')
      if not isinstance(r, numbers.Integral):
          raise TypeError('r must be an integer')
      if not isinstance(p, numbers.Integral):
          raise TypeError('p must be an integer')
      if not isinstance(olen, numbers.Integral):
          raise TypeError('length must be an integer')
      if N > 2**63:
          raise ValueError('N cannot be larger than 2**63')
      if (N & (N - 1)) or N < 2:
          raise ValueError('N must be a power of two larger than 1')
      if r <= 0:
          raise ValueError('r must be positive')
      if p <= 0:
          raise ValueError('p must be positive')
      if r * p >= 2**30:
          raise ValueError('r * p must be less than 2 ** 30')
      if olen <= 0:
          raise ValueError('length must be positive')
  
  
subject: Fix xrange fallback