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.\" ========================================================================
.\"
.IX Title "Crypt::KeyDerivation 3pm"
.TH Crypt::KeyDerivation 3pm "2020-11-09" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Crypt::KeyDerivation \- PBKDF1, PBKDF2 and HKDF key derivation functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Crypt::KeyDerivation \*(Aq:all\*(Aq;
\&
\&  ### 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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Provides an interface to Key derivation functions:
.IP "\(bu" 4
\&\s-1PBKDF1\s0 and \s-1PBKDF\s0 according to PKCS#5 v2.0 <https://tools.ietf.org/html/rfc2898>
.IP "\(bu" 4
\&\s-1HKDF\s0 (+ related) according to <https://tools.ietf.org/html/rfc5869>
.SH "FUNCTIONS"
.IX Header "FUNCTIONS"
.SS "pbkdf1"
.IX Subsection "pbkdf1"
\&\fB\s-1BEWARE:\s0\fR if you are not sure, do not use \f(CW\*(C`pbkdf1\*(C'\fR but rather choose \f(CW\*(C`pbkdf2\*(C'\fR.
.PP
.Vb 7
\&  $derived_key = pbkdf1($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: \*(AqSHA256\*(Aq
\&  # $len .............. optional, derived key len, DEFAULT: 32
.Ve
.SS "pbkdf2"
.IX Subsection "pbkdf2"
.Vb 7
\&  $derived_key = pbkdf2($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: \*(AqSHA256\*(Aq
\&  # $len .............. optional, derived key len, DEFAULT: 32
.Ve
.SS "hkdf"
.IX Subsection "hkdf"
.Vb 7
\&  $okm2 = hkdf($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: \*(AqSHA256\*(Aq
\&  # $len ........ optional, derived key len, DEFAULT: 32
\&  # $info ....... optional context and application specific information, DEFAULT: \*(Aq\*(Aq
.Ve
.SS "hkdf_extract"
.IX Subsection "hkdf_extract"
.Vb 3
\&  $prk  = hkdf_extract($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: \*(AqSHA256\*(Aq
.Ve
.SS "hkdf_expand"
.IX Subsection "hkdf_expand"
.Vb 7
\&  $okm = hkdf_expand($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: \*(AqSHA256\*(Aq
\&  # $len ........ optional, derived key len, DEFAULT: 32
\&  # $info ....... optional context and application specific information, DEFAULT: \*(Aq\*(Aq
.Ve