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87 lines
1.9 KiB
Perl
87 lines
1.9 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 (sha384 sha384_hex hmac_sha384_hex);
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sub module_constraints { [[8, 256], [64, 3000], [-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 $pkt_num = shift // int (rand (100000000));
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my $engineID = shift // random_hex_string (26, 34);
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# padding engineID: fill with zero
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my $pad_len = 34 - length ($engineID);
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my $engineID_orig = $engineID;
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$engineID = join '', $engineID, "0" x $pad_len;
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# make salt even if needed
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if (length ($salt) % 2 == 1)
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{
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$salt = $salt . "8";
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}
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my $string1 = $word x 1048576;
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$string1 = substr ($string1, 0, 1048576);
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my $sha384_digest1 = sha384_hex ($string1);
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my $buf = join '', $sha384_digest1, $engineID, $sha384_digest1;
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my $sha384_digest2 = sha384 (pack ("H*", $buf));
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my $digest = hmac_sha384_hex (pack ("H*", $salt), $sha384_digest2);
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$digest = substr ($digest, 0, 64);
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my $hash = "\$SNMPv3\$5\$" . $pkt_num . "\$" . $salt . "\$" . $engineID_orig . "\$" . $digest;
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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 $idx = index ($line, ':');
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return unless $idx >= 0;
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my $hash = substr ($line, 0, $idx);
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my $word = substr ($line, $idx + 1);
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return unless length ($word) gt 0;
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return unless substr ($hash, 0, 10) eq '$SNMPv3$5$';
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my (undef, $signature, $version, $pkt_num, $salt, $engineID, $digest) = split '\$', $hash;
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return unless defined $signature;
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return unless defined $version;
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return unless defined $pkt_num;
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return unless defined $salt;
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return unless defined $engineID;
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return unless defined $digest;
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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, $pkt_num, $engineID);
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return ($new_hash, $word);
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}
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1;
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