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79 lines
1.6 KiB
Perl
79 lines
1.6 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::SHA1 qw (sha1);
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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], [0, 256], [-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 // 4096;
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my $kdf = Crypt::PBKDF2->new
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(
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hash_class => 'HMACSHA1',
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iterations => $iter,
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output_len => 20
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);
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my $key = $kdf->PBKDF2 ($salt, $word);
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my $digest_hmac = hmac ("Client Key", $key, \&sha1, 64);
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my $digest_sha1 = sha1 ($digest_hmac);
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my $hash = sprintf ("\$xmpp-scram\$0\$%d\$%d\$%s\$%s", $iter, length ($salt), unpack ("H*", $salt), unpack ("H*", $digest_sha1));
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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, $idx + 1);
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return unless substr ($hash, 0, 13) eq '$xmpp-scram$0';
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my (undef, $signature, $type, $iter, $salt_len, $salt_hex, $hash_hex) = split '\$', $hash;
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return unless defined $signature;
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return unless defined $type;
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return unless defined $iter;
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return unless defined $salt_len;
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return unless defined $salt_hex;
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return unless defined $hash_hex;
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return unless ($signature eq 'xmpp-scram');
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return unless ($type eq '0');
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my $salt = pack ("H*", $salt_hex);
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return unless ($salt_len == length $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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