chashpipe - pipe on matching hash

chashpipe is licensed under the ISC license

Overview

• Pipes stdin to stdout if and only if the checksum matches the provided hash
• hashpipe (https://github.com/jbenet/hashpipe) reimplemented in C
• Compatible with sha1sum, sha256sum(, md5) etc

This tool is compatible with the standard unix checksum tools like sha1sum, sha256sum etc. I included neither compatibility with the multihash format (https://github.com/jbenet/multihash/) nor with the original hashpipe implementation. I decided to do this to keep the code and the binaries slim. Implementing traditional unix-tool compatibility and multihash would introduce too much bloat.

Usage

Generate sha1 checksum and check with hashpipe

% echo "foo" | shasum
f1d2d2f924e986ac86fdf7b36c94bcdf32beec15
% echo "foo" | hashpipe -f sha1 f1d2d2f924e986ac86fdf7b36c94bcdf32beec15
foo
% echo "bar" | hashpipe -f sha1 f1d2d2f924e986ac86fdf7b36c94bcdf32beec15
hashpipe: Hashes do not match: e242ed3bffccdf271b7fbaf34ed72d089537b42f
% echo "foo" | hashpipe -f sha1 f1d2
hashpipe: Hash length does not match hash function sha1

Supported hash functions:

• sha1 SHA1
• sha256 SHA2-256 (Default)
• sha512 SHA2-512
• ripemd RIPEMD160
• whirlpool WHIRLPOOL
• md5 MD5 (Don't use this!)

You can specify the hash function with the -f flag.

Help

% hashpipe -h
usage: hashpipe [-h] [-f hashfunction] [hash]
Command Summary:
	-f    Hash algorithm
			(sha1, sha256, sha512, whirlpool, ripemd)

	-h    Print this help

Report bugs to: https://github.com/meschi/chashpipe

Building

First assure, that you have the OpenSSL dev libraries installed. The package name for Debian-/Ubuntuish is called libssl-dev.

make
sudo make install