File::KDBX::IO::HmacBlock(3p)

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.