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132 lines
2.0 KiB
Perl
Executable File
132 lines
2.0 KiB
Perl
Executable File
#!/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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#
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# Helper functions
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#
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sub read_bytes
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{
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my $handle = shift;
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my $size = shift;
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my $data = "";
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read ($handle, $data, $size);
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# this function is very strict:
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# it only returns something if all the bytes can be read
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if (length ($data) != $size)
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{
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die "ERROR: Couldn't read data from the file. Maybe incorrect file format?\n";
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}
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return $data;
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}
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#
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# Start
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#
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if (scalar (@ARGV) != 1)
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{
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die "usage: $0 file.txt.aes\n";
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}
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my $file_name = $ARGV[0];
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my $file_handle;
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if (! open ($file_handle, "<", $file_name))
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{
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die "ERROR: Couldn't open file '$file_name'\n";
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}
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binmode ($file_handle);
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# Signature:
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my $signature = read_bytes ($file_handle, 3);
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if ($signature ne "AES")
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{
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die "ERROR: The file doesn't seem to be a correct aescrypt file (signature mismatch)\n";
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}
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# Version
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my $version = read_bytes ($file_handle, 1);
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if ($version ne "\x02")
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{
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die "ERROR: Currently only aescrypt file version 2 is supported by this script\n";
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}
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read_bytes ($file_handle, 1); # reservered/skip (normally should be just \x00)
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# Loop over the extensions until we got extension size 0
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my $extension_size = read_bytes ($file_handle, 2);
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while ($extension_size ne "\x00\x00")
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{
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my $skip_size = unpack ("S>", $extension_size); # 16-bit lengths
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read_bytes ($file_handle, $skip_size); # skip the extension
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$extension_size = read_bytes ($file_handle, 2);
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}
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# IV (for KDF)
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my $iv = read_bytes ($file_handle, 16);
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# IV (encrypted IV for AES decryption)
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my $iv_enc = read_bytes ($file_handle, 16);
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# key_enc
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my $key_enc = read_bytes ($file_handle, 32);
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# HMAC
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my $hmac = read_bytes ($file_handle, 32);
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#
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# Hex conversion
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#
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$iv = unpack ("H*", $iv);
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$iv_enc = unpack ("H*", $iv_enc);
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$key_enc = unpack ("H*", $key_enc);
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$hmac = unpack ("H*", $hmac);
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#
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# Final output
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#
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print sprintf ("\$aescrypt\$1*%s*%s*%s*%s\n", $iv, $iv_enc, $key_enc, $hmac);
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#
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# Cleanup
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#
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close ($file_handle);
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exit (0);
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