keepass::hmac_ostreambuf Class Reference

Output streambuf that writes HMAC-authenticated, block-structured data (KDBX4 format). More...

#include <stream.hh>

Inheritance diagram for keepass::hmac_ostreambuf:

Public Member Functions
	hmac_ostreambuf (std::ostream &dst, const uint8_t *hmac_key)
	Constructs an HMAC-signing output streambuf with the default 1 MiB block size.
	hmac_ostreambuf (std::ostream &dst, const uint8_t *hmac_key, uint32_t block_size)
	Constructs an HMAC-signing output streambuf with a custom block size.
	~hmac_ostreambuf ()
	Zeroizes the stored master HMAC key.
int	overflow (int c) override
	Buffers a character; flushes the current block when it reaches capacity.
int	sync () override
	Flushes any buffered data and writes the trailing empty end-of-stream block.

Detailed Description

Output streambuf that writes HMAC-authenticated, block-structured data (KDBX4 format).

Each block is written with a 32-byte HMAC-SHA256 over the block index, block size, and block data. A trailing empty block is written on sync to signal end-of-stream.

Constructor & Destructor Documentation

hmac_ostreambuf() [1/2]

keepass::hmac_ostreambuf::hmac_ostreambuf ( std::ostream &  dst, const uint8_t *  hmac_key  )

inline

Constructs an HMAC-signing output streambuf with the default 1 MiB block size.

Parameters

dst	The output stream to write HMAC-protected blocks to.
hmac_key	The 512-bit master HMAC key.

hmac_ostreambuf() [2/2]

keepass::hmac_ostreambuf::hmac_ostreambuf ( std::ostream &  dst, const uint8_t *  hmac_key, uint32_t  block_size  )

inline

Constructs an HMAC-signing output streambuf with a custom block size.

Parameters

dst	The output stream to write HMAC-protected blocks to.
hmac_key	The 512-bit master HMAC key.
block_size	The maximum number of data bytes per block.

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The documentation for this class was generated from the following file:

• stream.hh