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90 lines
1.6 KiB
Perl
90 lines
1.6 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 Convert::EBCDIC qw (ascii2ebcdic);
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use Crypt::DES;
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sub module_constraints { [[0, 8], [1, 8], [-1, -1], [-1, -1], [-1, -1]] }
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sub racf_hash
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{
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my ($username, $password) = @_;
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$username = substr ($username . " " x 8, 0, 8);
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$password = substr ($password . " " x 8, 0, 8);
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my $username_ebc = ascii2ebcdic ($username);
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my $password_ebc = ascii2ebcdic ($password);
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my @pw = split ("", $password_ebc);
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for (my $i = 0; $i < 8; $i++)
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{
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$pw[$i] = unpack ("C", $pw[$i]);
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$pw[$i] ^= 0x55;
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$pw[$i] <<= 1;
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$pw[$i] = pack ("C", $pw[$i] & 0xff);
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}
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my $key = join ("", @pw);
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my $cipher = new Crypt::DES $key;
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my $ciphertext = $cipher->encrypt ($username_ebc);
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my $ct = unpack ("H16", $ciphertext);
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return $ct;
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}
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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 $hash_buf = racf_hash (uc $salt, $word);
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my $hash = sprintf ('$racf$*%s*%s', uc $salt, uc $hash_buf);
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return $hash;
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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 @line_elements = split (":", $line);
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return if scalar @line_elements < 2;
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my $hash_in = shift @line_elements;
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my $word = join (":", @line_elements);
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# check signature
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my @hash_elements = split ('\*', $hash_in);
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return unless ($hash_elements[0] eq '$racf$');
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my $salt = $hash_elements[1];
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return unless defined $salt;
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return unless defined $word;
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$word = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word, $salt);
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return ($new_hash, $word);
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}
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1;
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