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Xoocycle, a C90 implementation of the Xoodyak hash and AEAD construction
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sbp/xoocycle
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Xoocycle is an implementation of the Keccak Team'sXoodyak hash and AEAD construction in under 275 lines of standard C, compatible with C90 and later versions.
This code has not been audited, either for general integrity, cryptographic suitability, or compliance to the Xoodyak specification. It does pass the Xoodyak test vectors, and has been analysed with Flawfinder, Splint, Infer, Clang SA, and Valgrind to protect against some trivial errors. Only little-endian platforms are supported.
The header filexoocycle.h defines twenty exported names, seventeen of which use the standard prefixxoocycle. The remaining three are the modern type namesu8,u32, andsize.
The code is available under the Apache License 2.0.
The filexoohash.c is a full script that takes the Xoodyak-256 hash of stdin. The filexootest.c contains an AEAD example. This is an excerpt from the former script:
xoocycle_cyclist(&cyc,xoocycle_empty,0,xoocycle_empty,0,xoocycle_empty,0);while (1) {len=read(STDIN_FILENO,io,IO);if (len<0) {fprintf(stderr,"error\n");exit(EXIT_FAILURE); }if (len==0) {break; }xoocycle_absorb(&cyc,io,len); }xoocycle_squeeze(&cyc,io,HASH);print8(io,HASH);xoocycle_erase(&cyc);
Whenxoohash.c is run on itself, it produces:
51f1608c0a2ccc73f72d3403e32414c2fcda33dc21a475b20d2c3e66081c4ee1Xoodyak was created by theKeccak Team. Thexoodoo32 permutation function inxoocycle.c is based on a public domainversion byOdzhan.