#!/bin/sh -e
# Autodetect possible commandlines for various hashes. Example usage:
# meta4ra-{create,check} -hashes "$(meta4ra-hashes-detect)" ...

hw="hello world"
hashes=""

desired="$1"

check() {
    local name="$1"
    if [ -n "$desired" ] && [ $desired != "$name" ] ; then return 1 ; fi
    local cmd="$2"
    local cmdline="$cmd"
    [ "$cmd" != "builtin" ] || cmd="meta4ra-hash -hashes $name:builtin"
    our=$(echo -n hello world | sh -e -c "$cmd" | { read h rem ; printf %s "$h"; })
    [ $HSH = "$our" ] && hashes="$hashes,$name:$cmdline"
}

HSH=d74981efa70a0c880b8d8c1985d075dbcbf679b99a5f9914e5aaf96b831a9e24
check blake3-256 b3sum || # https://github.com/BLAKE3-team/BLAKE3
check blake3-256 builtin || :

HSH=021ced8799296ceca557832ab941a50b4a11f83478cf141f51f933f653ab9fbcc05a037cddbed06e309bf334942c4e58cdf1a46e237911ccd7fcf9787cbc7fd0
check blake2b-512 b2sum || # https://blake2.net/, GNU Coreutils
check blake2b-512 "openssl blake2b512 -r" ||
check blake2b-512 builtin || :

HSH=256c83b297114d201b30179f3f0ef0cace9783622da5974326b436178aeef610
check blake2b-256 "b2sum -l 256" ||
check blake2b-512 builtin || :

HSH=8b4830244fc36daa11177311dc6bf7636376180dce2d29193335878142e7d6f5e9016beba729e0a353dd2fd421c8b2022ee8927f0bce6b88631bb01be2e0f5ba
check skein-512 skein512 || # FreeBSD's out-of-box command
check skein-512 builtin || :

HSH=3a9159f071e4dd1c8c4f968607c30942e120d8156b8b1e72e0d376e8871cb8b8
check shake128 goshake128 || # go.stargrave.org/gosha3
check shake128 "sha3sum -a 128000 | dd bs=1 count=64 2>/dev/null" || # p5-Digest-SHA3
check shake128 builtin || :
# openssl shake128 -- useless, as it outputs only 128 bits

HSH=369771bb2cb9d2b04c1d54cca487e372d9f187f73f7ba3f65b95c8ee7798c527f4f3c2d55c2d46a29f2e945d469c3df27853a8735271f5cc2d9e889544357116
check shake256 goshake256 ||
check shake256 "sha3sum -a 256000 | dd bs=1 count=128 2>/dev/null" ||
check shake256 builtin || :

HSH=309ecc489c12d6eb4cc40f50c902f2b4d0ed77ee511a7c7a9bcd3ca86d4cd86f989dd35bc5ff499670da34255b45b0cfd830e81f605dcf7dc5542e93ae9cd76f
check sha-512 sha512 ||
check sha-512 sha512sum ||
check sha-512 "libressl dgst -sha512" ||
check sha-512 "openssl sha512 -r" ||
check sha-512 builtin || :

HSH=b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9
check sha-256 sha256 ||
check sha-256 sha256sum ||
check sha-256 "libressl dgst -sha256" ||
check sha-256 "openssl sha256 -r" ||
check sha-256 builtin || :

unxxd="xxd -c 0 -p"
unhexdump="hexdump -v -e '/1 \"%02x\"' ; echo"
HSH=84d883ede9fa6ce855d82d8c278ecd9f5fc88bf0602831ae0c38b9b506ea3cb02f3fa076b8f5664adf1ff862c0157da4cc9a83e141b738ff9268a9ba3ed6f563
check streebog-512 streebog512 $hsh || # go.cypherpunks.su/gogost
check streebog-512 "nettle-hash --algorithm=streebog512 --raw | $unxxd" ||
check streebog-512 "nettle-hash --algorithm=streebog512 --raw | $unhexdump" ||
check streebog-512 "libressl dgst -streebog512" ||
check streebog-512 builtin || :

HSH=c600fd9dd049cf8abd2f5b32e840d2cb0e41ea44de1c155dcd88dc84fe58a855
check streebog-256 streebog256 ||
check streebog-256 "nettle-hash --algorithm=streebog256 --raw | $unxxd" ||
check streebog-256 "nettle-hash --algorithm=streebog256 --raw | $unhexdump" ||
check streebog-256 "libressl dgst -streebog256" ||
check streebog-256 builtin || :

HSH=df8d09e93f874900a99b8775cc15b6c7
check xxh3-128 "xxhsum -H128" || # https://cyan4973.github.io/xxHash/
check xxh3-128 builtin || :

[ -n "$hashes" ]
echo ${hashes#,}