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77 lines
1.6 KiB
Perl
77 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 Crypt::PBKDF2;
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use Digest::HMAC qw (hmac_hex);
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use Digest::SHA qw (sha256);
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sub module_constraints { [[0, 256], [-1, -1], [-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_hex = shift;
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my $ciphertext_hex = shift // random_hex_string (64);
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if (length $salt_hex == 0)
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{
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$salt_hex = random_hex_string (64);
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}
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my $salt_bin = pack ("H*", $salt_hex);
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my $ciphertext_bin = pack ("H*", $ciphertext_hex);
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# actually 80 but the last 16 bytes are the IV which we don't need
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my $out_len = 64;
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my $pbkdf2 = Crypt::PBKDF2->new
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(
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hasher => Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA2', 256),
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iterations => 10000,
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output_len => $out_len
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);
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my $derived_key = $pbkdf2->PBKDF2 ($salt_bin, $word);
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my $hash_buf = hmac_hex ($ciphertext_bin, substr ($derived_key, 32, 32), \&sha256);
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my $hash = sprintf ('$ansible$0*0*%s*%s*%s', unpack ("H*", $salt_bin), unpack ("H*", $ciphertext_bin), $hash_buf);
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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 $line = shift;
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my ($digest, $word) = split (':', $line);
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return unless defined $digest;
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return unless defined $word;
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my @data = split ('\*', $digest);
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return unless scalar @data == 5;
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my ($signature_tmp, $cipher, $salt, $ciphertext, $hmac) = @data;
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my (undef, $signature, undef) = split ('\$', $signature_tmp);
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return unless ($signature eq "ansible");
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$word = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word, $salt, $ciphertext);
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return ($new_hash, $word);
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}
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1;
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