dnl
dnl  Copyright (C) 2025  CismonX <admin@cismon.net>
dnl
dnl  Copying and distribution of this file, with or without modification,
dnl  are permitted in any medium without royalty,
dnl  provided the copyright notice and this notice are preserved.
dnl  This file is offered as-is, without any warranty.
dnl

AT_SETUP([util lib: hash function])
AT_KEYWORDS([lib hash])

# This test only serves as a basic sanity check.
#
# For reliable testing of hash functions,
# see <https://github.com/Cyan4973/xxHash/tree/dev/tests>.
ATX_CHECK_LIB([
    calc_digest() {
        echo "$2" | check-util-lib hash -s$1
    }

    ATX_RUN_REPEAT([16], [
        seed=$(ath_fn_rand_u64_hex)
        input=$(ath_fn_rand_base64 300)
        echo "hash seed: $seed; input: $input"

        hash_1=$(calc_digest $seed $input)
        hash_2=$(calc_digest $seed $input)
        hash_3=$(calc_digest $seed $input)
        hash_x=$(calc_digest $seed $input+)

        if test "$hash_1" != "$hash_2" -o "$hash_2" != "$hash_3"; then
            echo 'bad hash function: inconsistent digest'
            exit 1
        fi

        if test "$hash_1" = "$hash_x"; then
            echo 'bad hash function: collision'
            exit 1
        fi
    ])
])

AT_CLEANUP