NAME

       File::KDBX::IO::HmacBlock - HMAC block stream IO handle

VERSION

       version 0.906

DESCRIPTION

       Writing to a HMAC-block stream handle will transform the data into a series of blocks. An
       HMAC is calculated for each block and is included in the output.

       Reading from a handle, each block will be verified and authenticated as the blocks are
       disassembled back into a data stream.

       This format helps ensure data integrity and authenticity of KDBX4 files.

       Each block is encoded thusly:

       •   HMAC - 32 bytes, calculated over [block index (increments starting with 0), block size
           and data]

       •   Block size - Little-endian unsigned 32-bit (counting only the data)

       •   Data - String of bytes

       The terminating block is an empty block encoded as usual but block size is 0 and there is
       no data.

ATTRIBUTES

   block_size
       Desired block size when writing (default: $File::KDBX::IO::HmacBlock::BLOCK_SIZE or
       1,048,576 bytes)

   key
       HMAC-SHA256 key for authenticating the data stream (required)

METHODS

   new
           $fh = File::KDBX::IO::HmacBlock->new(%attributes);
           $fh = File::KDBX::IO::HmacBlock->new($fh, %attributes);

       Construct a new HMAC-block stream IO handle.

BUGS

       Please report any bugs or feature requests on the bugtracker website
       <https://github.com/chazmcgarvey/File-KDBX/issues>

       When submitting a bug or request, please include a test-file or a patch to an existing
       test-file that illustrates the bug or desired feature.

AUTHOR

       Charles McGarvey <ccm@cpan.org>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2022 by Charles McGarvey.

       This is free software; you can redistribute it and/or modify it under the same terms as
       the Perl 5 programming language system itself.