Crypt::KeyDerivation(3)

NAME
Crypt::KeyDerivation - PBKDF1, PBKDF2 and HKDF key derivation functions

SYNOPSIS
  ### PBKDF1/2
  $derived_key1 = pbkdf1($password, $salt, $iteration_count, $hash_name, $len);
  $derived_key2 = pbkdf2($password, $salt, $iteration_count, $hash_name, $len);

  ### HKDF & co.
  $derived_key3 = hkdf($keying_material, $salt, $hash_name, $len, $info);
  $prk  = hkdf_extract($keying_material, $salt, $hash_name);
  $okm1 = hkdf_expand($prk, $hash_name, $len, $info);

DESCRIPTION
Provides an interface to Key derivation functions:

•   PBKDF1 and PBKDF according to PKCS#5 v2.0 <https://tools.ietf.org/html/rfc2898>

•   HKDF (+ related) according to <https://tools.ietf.org/html/rfc5869>

FUNCTIONS

  pbkdf1
BEWARE: if you are not sure, do not use "pbkdf1" but rather choose "pbkdf2".

  $derived_key = pbkdf1($password, $salt, $iteration_count, $hash_name, $len);
  #or
  $derived_key = pbkdf1($password, $salt, $iteration_count, $hash_name);
  #or
  $derived_key = pbkdf1($password, $salt, $iteration_count);
  #or
  $derived_key = pbkdf1($password, $salt);

  # $password ......... input keying material  (password)
  # $salt ............. salt/nonce (expected length: 8)
  # $iteration_count .. optional, DEFAULT: 5000
  # $hash_name ........ optional, DEFAULT: 'SHA256'
  # $len .............. optional, derived key len, DEFAULT: 32

  pbkdf2
  $derived_key = pbkdf2($password, $salt, $iteration_count, $hash_name, $len);
  #or
  $derived_key = pbkdf2($password, $salt, $iteration_count, $hash_name);
  #or
  $derived_key = pbkdf2($password, $salt, $iteration_count);
  #or
  $derived_key = pbkdf2($password, $salt);

  # $password ......... input keying material (password)
  # $salt ............. salt/nonce
  # $iteration_count .. optional, DEFAULT: 5000
  # $hash_name ........ optional, DEFAULT: 'SHA256'
  # $len .............. optional, derived key len, DEFAULT: 32

  hkdf
  $okm2 = hkdf($password, $salt, $hash_name, $len, $info);
  #or
  $okm2 = hkdf($password, $salt, $hash_name, $len);
  #or
  $okm2 = hkdf($password, $salt, $hash_name);
  #or
  $okm2 = hkdf($password, $salt);

  # $password ... input keying material (password)
  # $salt ....... salt/nonce, if undef defaults to HashLen zero octets
  # $hash_name .. optional, DEFAULT: 'SHA256'
  # $len ........ optional, derived key len, DEFAULT: 32
  # $info ....... optional context and application specific information, DEFAULT: ''

  hkdf_extract
  $prk  = hkdf_extract($password, $salt, $hash_name);
  #or
  $prk  = hkdf_extract($password, $salt, $hash_name);

  # $password ... input keying material (password)
  # $salt ....... salt/nonce, if undef defaults to HashLen zero octets
  # $hash_name .. optional, DEFAULT: 'SHA256'

  hkdf_expand
  $okm = hkdf_expand($pseudokey, $hash_name, $len, $info);
  #or
  $okm = hkdf_expand($pseudokey, $hash_name, $len);
  #or
  $okm = hkdf_expand($pseudokey, $hash_name);
  #or
  $okm = hkdf_expand($pseudokey);

  # $pseudokey .. input keying material
  # $hash_name .. optional, DEFAULT: 'SHA256'
  # $len ........ optional, derived key len, DEFAULT: 32
  # $info ....... optional context and application specific information, DEFAULT: ''