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98 lines
2.0 KiB
Perl
98 lines
2.0 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::OpenSSH::ChachaPoly;
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sub module_constraints { [[-1, -1], [-1, -1], [32, 32], [-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 $param = shift;
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my $param2 = shift;
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my $param3 = shift;
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my $counter;
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my $offset;
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my $iv;
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if (defined $param)
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{
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$counter = $param;
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$offset = $param2;
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$iv = $param3;
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}
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else
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{
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$counter = "0400000000000003";
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$offset = int (rand (63));
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$iv = "0200000000000001";
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}
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my $plaintext = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz0a2b4c6d8e";
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my $eight_byte_iv = pack ("H*", $iv);
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my $eight_byte_counter = pack ("H*", $counter);
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my $pad_len = 32 - length ($word);
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my $key = $word . "\0" x $pad_len;
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my $cipher = Crypt::OpenSSH::ChachaPoly->new ($key);
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$cipher->ivsetup ($eight_byte_iv, $eight_byte_counter);
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my $enc = $cipher->encrypt ($plaintext);
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my $enc_offset = substr ($enc, $offset, 8);
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my $hash_buf = $enc_offset;
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my $hash = sprintf ("\$chacha20\$\*%s\*%d\*%s\*%s\*%s", $counter, $offset, $iv, unpack ("H*", substr ($plaintext, $offset, 8)), unpack ("H*", $enc_offset));
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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 $index1 = index ($line, ':');
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return if ($index1 < 0);
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my $hash_in = substr ($line, 0, $index1);
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my $word = substr ($line, $index1 + 1);
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return if (length ($hash_in) < 11);
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return unless (substr ($hash_in, 0, 11) eq "\$chacha20\$\*");
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my @data = split ('\*', $hash_in);
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return unless (scalar (@data) == 6);
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my $param = $data[1]; # counter
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my $param2 = $data[2]; # offset
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my $param3 = $data[3]; # iv
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return unless defined $param;
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return unless defined $param2;
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return unless defined $param3;
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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, undef, $param, $param2, $param3);
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return ($new_hash, $word);
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}
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1;
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