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I want to test this StackExchange Q/A.
which got 889DA12A88D36BCE0966AB1A79125779DD1F2FC6F1145DE131FD52A5B468796D from
% keccak -256 198584347013dd91832be3d82529437db7cc8e1850e559cdd3872b29ca819601
However, when I use the Keccak-256 online tool found here: https://emn178.github.io/online-tools/keccak_256.html
I get: 11d0c17e049fd25f195a6b3694d37658240961d55f263cca40f2c5f91e6fac2d
The results are not the same. Is there anything wrong?
The online tool works perfectly, but the form accepts text and you were pasting in hex. The ASCII string "198584347013dd91832be3d82529437db7cc8e1850e559cdd3872b29ca819601" is 31393835383433343730313364643931383332626533643832353239343337646237636338653138353065353539636464333837326232396361383139363031 in hex, and the online tool correctly produced a keccak256 hash of the hex of what you pasted in.
The result of your keccak -256 command is also correct.
keccak -256 31393835383433343730313364643931383332626533643832353239343337646237636338653138353065353539636464333837326232396361383139363031 the answer will be 11d0c17e049fd25f195a6b3694d37658240961d55f263cca40f2c5f91e6fac2d , exactly the same as the online tool reported.