vsign

Creates binary signature of file contents. Works as fast as your storage. Uses Meow Hash - the best hash that I could find for this particual type of work.

Prerequisites

• Windows or Linux
• x86-64 C++14 compiler

Building

Windows (using Visual Studio)

• make sure you have relevant Windows SDK installed
• run cmd in vsign dir
• run C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvars64.bat or equivalent for your Visual Studio version
• run build.bat

Linux (using clang++)

• run build.sh

Usage:

Experimental software! Use at your own risk! Overwrites output file.

vsign -h

Usage: vsign [OPTIONS] INPUT_FILE [OUTPUT_FILE]

Creates binary signature of contents of INPUT_FILE and writes to OUTPUT_FILE
(by default will write to 'INPUT_FILE.signature')

Options:
 -b		Block size (bytes), default is 1 048 576 bytes
 -h		Print help text
 -t		Threads count, equals to number of logical cores by default 
 -v		Verbose output
 -y		Verify that OUTPUT_FILE contains correct signature of INPUT_FILE

Known issues:

• Currently there is no clear error message for "out of disk space" situation
• Add tests
• Implement verify feature (-y)
• [Windows] no error message when lack permisiion to create signature file