tiny_sha3
Very small, readable implementation of the FIPS 202 and SHA3 hash function. Public domain.
Updated 27-Dec-15:
Added SHAKE128 and SHAKE256 code and test vectors. The code can actually do a XOF of arbitrary size (like "SHAKE512").
Updated 03-Sep-15:
Made the implementation portable. The API is now pretty much the same that OpenSSL uses.
Updated 07-Aug-15:
Now that SHA3 spec is out, I've updated the package to match with the new padding rules. There is literally one line difference between Keccak 3.0 and SHA-3 implementations:
temp[inlen++] = 0x06; // XXX Padding Changed from Keccak 3.0
The 0x06 constant there used to be 0x01. But this of course totally breaks compatibility and test vectors had to be revised.
SHA-3 Spec: http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf
Cheers,
- markku
Original README.TXT from 19-Nov-11:
Hi.
The SHA-3 competition is nearing it's end and I would personally like to support Keccak as the winner. I have a PhD in hash function cryptanalysis so don't take my word for it, go ahead and look into the code !
Since I couldn't find a compact and/or readable implementation of Keccak anywhere, here's one I cooked up as a service to the curious.
This implementation is intended for study of the algorithm, not for production use.
The code works correctly on 64-bit little-endian platforms with gcc. Like your Linux box. The main.c module contains self-tests for all officially supported hash sizes.
If you're looking for production code, the official multi-megabyte package covers everyting you could possibly need and too much much more: http://keccak.noekeon.org/
Cheers,
- Markku 19-Nov-11
Dr. Markku-Juhani O. Saarinen [email protected]