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118 lines
3.5 KiB
Perl
118 lines
3.5 KiB
Perl
#!/usr/bin/env perl
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##
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## Author......: See docs/credits.txt
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## License.....: MIT
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##
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use strict;
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use warnings;
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use Crypt::PBKDF2;
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sub module_constraints { [[0, 255], [16, 16], [0, 55], [16, 16], [0, 55]] }
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sub module_generate_hash
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{
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my $word = shift;
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my $salt = shift;
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my $iter = shift;
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my $iterations = 64;
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if (length ($iter))
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{
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$iterations = 1 << int ($iter);
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}
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my $digest = aix_ssha256_pbkdf2 ($word, $salt, $iterations);
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return sprintf ("{ssha256}%02i\$%s\$%s", log ($iterations) / log (2), $salt, $digest);
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}
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sub module_verify_hash
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{
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my $line = shift;
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my ($hash, $word) = split (':', $line);
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return unless defined $hash;
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return unless defined $word;
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my $signature = substr ($hash, 0, 9);
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return unless ($signature eq "{ssha256}");
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$hash = substr ($hash, 9);
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my @data = split ('\$', $hash);
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return unless scalar @data == 3;
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my $iter = shift (@data);
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my $salt = shift @data;
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my $digest = shift @data;
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word_packed, $salt, $iter);
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return ($new_hash, $word);
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}
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sub aix_ssha256_pbkdf2
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{
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my $word_buf = shift;
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my $salt_buf = shift;
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my $iterations = shift;
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my $hasher = Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA2', 256);
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my $pbkdf2 = Crypt::PBKDF2->new (
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hasher => $hasher,
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iterations => $iterations,
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output_len => 32
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);
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my $hash_buf = $pbkdf2->PBKDF2 ($salt_buf, $word_buf);
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my $tmp_hash = "";
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$tmp_hash .= to64 ((int (ord (substr ($hash_buf, 0, 1))) << 16) | (int (ord (substr ($hash_buf, 1, 1))) << 8) | (int (ord (substr ($hash_buf, 2, 1)))), 4);
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$tmp_hash .= to64 ((int (ord (substr ($hash_buf, 3, 1))) << 16) | (int (ord (substr ($hash_buf, 4, 1))) << 8) | (int (ord (substr ($hash_buf, 5, 1)))), 4);
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$tmp_hash .= to64 ((int (ord (substr ($hash_buf, 6, 1))) << 16) | (int (ord (substr ($hash_buf, 7, 1))) << 8) | (int (ord (substr ($hash_buf, 8, 1)))), 4);
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$tmp_hash .= to64 ((int (ord (substr ($hash_buf, 9, 1))) << 16) | (int (ord (substr ($hash_buf, 10, 1))) << 8) | (int (ord (substr ($hash_buf, 11, 1)))), 4);
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$tmp_hash .= to64 ((int (ord (substr ($hash_buf, 12, 1))) << 16) | (int (ord (substr ($hash_buf, 13, 1))) << 8) | (int (ord (substr ($hash_buf, 14, 1)))), 4);
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$tmp_hash .= to64 ((int (ord (substr ($hash_buf, 15, 1))) << 16) | (int (ord (substr ($hash_buf, 16, 1))) << 8) | (int (ord (substr ($hash_buf, 17, 1)))), 4);
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$tmp_hash .= to64 ((int (ord (substr ($hash_buf, 18, 1))) << 16) | (int (ord (substr ($hash_buf, 19, 1))) << 8) | (int (ord (substr ($hash_buf, 20, 1)))), 4);
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$tmp_hash .= to64 ((int (ord (substr ($hash_buf, 21, 1))) << 16) | (int (ord (substr ($hash_buf, 22, 1))) << 8) | (int (ord (substr ($hash_buf, 23, 1)))), 4);
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$tmp_hash .= to64 ((int (ord (substr ($hash_buf, 24, 1))) << 16) | (int (ord (substr ($hash_buf, 25, 1))) << 8) | (int (ord (substr ($hash_buf, 26, 1)))), 4);
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$tmp_hash .= to64 ((int (ord (substr ($hash_buf, 27, 1))) << 16) | (int (ord (substr ($hash_buf, 28, 1))) << 8) | (int (ord (substr ($hash_buf, 29, 1)))), 4);
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$tmp_hash .= to64 ((int (ord (substr ($hash_buf, 30, 1))) << 16) | (int (ord (substr ($hash_buf, 31, 1))) << 8) , 3);
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return $tmp_hash;
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}
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sub to64
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{
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my $v = shift;
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my $n = shift;
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my $itoa64 = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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my $ret = "";
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while (($n - 1) >= 0)
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{
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$n = $n - 1;
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$ret .= substr ($itoa64, $v & 0x3f, 1);
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$v = $v >> 6;
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}
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return $ret
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}
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1;
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