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146 lines
3.5 KiB
Perl
146 lines
3.5 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 Crypt::Mode::ECB;
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sub module_constraints { [[0, 256], [64, 64], [-1, -1], [-1, -1], [-1, -1]] }
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my $AXCRYPT_MAGIC = pack ("H*", "a6a6a6a6a6a6a6a6");
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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_wrap = shift;
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my $iter_wrap = shift // 10000;
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my $data = shift;
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my $salt_kdf = shift // random_bytes (32);
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my $iter_kdf = shift // 1000;
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my $pbkdf2 = Crypt::PBKDF2->new
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(
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hasher => Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA2', 512),
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iterations => $iter_kdf,
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output_len => 64
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);
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# most heavy part (PBKDF2-HMAC-SHA512):
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my $KEK = $pbkdf2->PBKDF2 ($salt_kdf, $word);
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# reduce 64 bytes of key to 16 bytes (why not just use 16 byte output length o.O ?)
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$KEK = substr ($KEK, 0, 16) ^
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substr ($KEK, 16, 16) ^
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substr ($KEK, 32, 16) ^
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substr ($KEK, 48, 16);
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$KEK = $KEK ^ substr ($salt_wrap, 0, 16);
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my $aes = Crypt::Mode::ECB->new ('AES', 0);
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if (defined ($data)) # decrypt
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{
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# unwrap:
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my $data_mod = $data;
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for (my $j = $iter_wrap - 1; $j >= 0; $j--)
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{
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for (my $k = 4; $k >= 1; $k--)
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{
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my $idx = 4 * $j + $k;
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my $block = substr ($data_mod, 0, 4) .
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(substr ($data_mod, 4, 4) ^ pack ("L>", $idx)) .
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substr ($data_mod, $k * 8, 8);
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$block = $aes->decrypt ($block, $KEK);
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substr ($data_mod, 0, 8) = substr ($block, 0, 8);
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substr ($data_mod, $k * 8, 8) = substr ($block, 8, 8);
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}
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}
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if (index ($data_mod, $AXCRYPT_MAGIC) != 0)
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{
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$data = "WRONG";
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}
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}
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else # encrypt
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{
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# wrap:
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$data = $AXCRYPT_MAGIC . random_bytes (136);
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for (my $j = 0; $j < $iter_wrap; $j++)
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{
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for (my $k = 1; $k <= 4; $k++)
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{
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my $idx = 4 * $j + $k;
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my $block = substr ($data, 0, 8) .
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substr ($data, $k * 8, 8);
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$block = $aes->encrypt ($block, $KEK);
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substr ($block, 4, 4) ^= pack ("L>", $idx);
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substr ($data, 0, 8) = substr ($block, 0, 8);
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substr ($data, $k * 8, 8) = substr ($block, 8, 8);
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}
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}
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}
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my $hash = sprintf ("\$axcrypt\$*2*%i*%s*%s*%i*%s", $iter_wrap, unpack ("H*", $salt_wrap), unpack ("H*", $data), $iter_kdf, unpack ("H*", $salt_kdf));
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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, 11) eq '$axcrypt$*2';
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my (undef, undef, $iter_wrap, $salt_wrap, $data, $iter_kdf, $salt_kdf) = split ('\*', $hash);
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return unless defined ($iter_wrap);
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return unless defined ($salt_wrap);
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return unless defined ($data);
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return unless defined ($iter_kdf);
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return unless defined ($salt_kdf);
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return unless ($iter_wrap =~ m/^[0-9]{1,7}$/);
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return unless ($salt_wrap =~ m/^[0-9a-fA-F]+$/);
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return unless ($data =~ m/^[0-9a-fA-F]+$/);
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return unless ($iter_kdf =~ m/^[0-9]{1,7}$/);
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return unless ($salt_kdf =~ m/^[0-9a-fA-F]+$/);
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$salt_wrap = pack ("H*", $salt_wrap);
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$data = pack ("H*", $data);
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$salt_kdf = pack ("H*", $salt_kdf);
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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_wrap, $iter_wrap, $data, $salt_kdf, $iter_kdf);
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return ($new_hash, $word);
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}
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1;
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