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76 lines
1.4 KiB
Perl
76 lines
1.4 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 Digest::SHA qw (sha1);
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use MIME::Base64 qw (encode_base64 decode_base64);
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sub module_constraints { [[0, 40], [4, 15], [-1, -1], [-1, -1], [-1, -1]] }
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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 // 1024;
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my $hash_buf = $salt;
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for (my $pos = 0; $pos < $iter; $pos++)
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{
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$hash_buf = sha1 ($word . $hash_buf);
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}
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$hash_buf = encode_base64 ($hash_buf . $salt, "");
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my $hash = sprintf ("{x-issha, %i}%s", $iter, $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 $line = shift;
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my ($hash_in, $word) = split (/:/, $line);
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return unless defined $hash_in;
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# SAP CODVN H (PWDSALTEDHASH) iSSHA-1
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return unless (substr ($hash_in, 0, 10) eq '{x-issha, ');
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# get iterations
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my $index1 = index ($hash_in, "}", 10);
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return if $index1 < 1;
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my $iter = substr ($hash_in, 10, $index1 - 10);
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$iter = int ($iter);
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# base64 substring
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my $base64_encoded = substr ($hash_in, $index1 + 1);
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my $base64_decoded = decode_base64 ($base64_encoded);
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my $salt = substr ($base64_decoded, 20);
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return unless defined $salt;
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return unless defined $iter;
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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, $iter);
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return ($new_hash, $word);
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}
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1;
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