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MAC functions return rightmost value instead of leftmost
Hi,
I'm not sure if I'm missing something obvious, but some of the MAC functions are returning rightmost value instead of leftmost?
According to https://en.wikipedia.org/wiki/ISO/IEC_9797-1
Truncation
The MAC is obtained by truncating the block G (keeping the leftmost bits, discarding the rightmost bits), to the required length.
In file ./lib/mac.js:
function des_mac
// var mac = result.slice(result.length-len, result.length); --> returning rightmost value
var mac = result.slice(0, len); // --> returning leftmost value
Similar thing is present in functions des_mac_algorithm2 and des_mac_algorithm3.
Kind regards,
Duro
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