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79 lines
1.7 KiB
79 lines
1.7 KiB
#!/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 (decode_base64 encode_base64);
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use Digest::SHA qw (sha256);
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use Digest::HMAC qw (hmac);
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use Crypt::PBKDF2;
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sub module_constraints { [[0, 256], [28, 28], [-1, -1], [-1, -1], [-1, -1]] }
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my $ITERATIONS = 4096;
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my $HMAC_SALT = "Server Key";
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my $HMAC_SALT_2 = "Client Key";
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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 // $ITERATIONS;
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my $pbkdf = Crypt::PBKDF2->new
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(
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hasher => Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA2', 256),
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iterations => $iter,
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output_len => 32
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);
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my $pbkdf2_dgst = $pbkdf->PBKDF2 ($salt, $word);
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my $server_key = hmac ($HMAC_SALT, $pbkdf2_dgst, \&sha256);
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my $stored_key = sha256 (hmac ($HMAC_SALT_2, $pbkdf2_dgst, \&sha256));
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my $hash = sprintf ('SCRAM-SHA-256$%i:%s$%s:%s', $iter, encode_base64 ($salt, ""), encode_base64 ($stored_key, ""), encode_base64 ($server_key, ""));
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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 $idx = rindex ($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, $idx + 1);
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return unless substr ($hash, 0, 13) eq 'SCRAM-SHA-256';
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my (undef, $iter, $salt) = split (':|\$', $hash);
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return unless defined ($iter);
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return unless defined ($salt);
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return unless ($iter =~ m/^[1-9][0-9]{0,7}$/);
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$iter = int ($iter);
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return unless ($salt =~ m/^[A-Za-z0-9+\/=]{0,88}$/);
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$salt = decode_base64 ($salt);
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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, $iter);
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return ($new_hash, $word);
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}
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1;
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