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108 lines
2.2 KiB
Perl
108 lines
2.2 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 MIME::Base64 qw (encode_base64 decode_base64);
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use Crypt::CBC;
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use Crypt::PBKDF2;
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sub module_constraints { [[0, 256], [16, 16], [-1, -1], [-1, -1], [-1, -1]] }
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my $ITERATIONS = 100;
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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 $iv = shift;
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my $data = shift;
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my $pbkdf2 = Crypt::PBKDF2->new
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(
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hasher => Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA1'),
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iterations => $ITERATIONS,
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output_len => 32
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);
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my $key = $pbkdf2->PBKDF2 ($salt, $word);
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if (! defined ($iv))
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{
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$iv = random_bytes (16);
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}
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my $cipher = Crypt::CBC->new ({
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key => $key,
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cipher => "Crypt::Rijndael",
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iv => $iv,
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literal_key => 1,
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keysize => 32,
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header => "none",
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padding => "none",
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});
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if (! defined ($data))
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{
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$data = random_hex_string (64);
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$data .= "\x10" x 16 # padding block
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}
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else
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{
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$data = $cipher->decrypt ($data);
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my $padding_block = substr ($data, 64, 16);
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if ($padding_block ne "\x10" x 16)
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{
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$data = "\x00" x 80; # FAKE data (length: 64 + 16)
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}
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}
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my $encrypted_data = $cipher->encrypt ($data);
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my $hash = sprintf ("%s%s%s", unpack ("H*", $salt), unpack ("H*", $iv), encode_base64 ($encrypted_data, ""));
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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, $word) = split (":", $line);
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return unless (defined ($hash));
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return unless (defined ($word));
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return unless (length ($hash) == (32 + 32 + 108));
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my $salt = substr ($hash, 0, 32);
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my $iv = substr ($hash, 32, 32);
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my $data = substr ($hash, 64, 108); # or until the end
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return unless ($salt =~ m/^[0-9a-fA-F]{32}$/);
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return unless ($iv =~ m/^[0-9a-fA-F]{32}$/);
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return unless ($data =~ m/^[A-Za-z0-9+\/=]{108}$/);
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$salt = pack ("H*", $salt);
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$iv = pack ("H*", $iv);
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$data = decode_base64 ($data);
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return unless (length ($data) == (64 + 16)); # 80
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$word = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word, $salt, $iv, $data);
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return ($new_hash, $word);
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}
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1;
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