New answers tagged hotp
I managed to find it out by reproducing the test vectors. TL;DR: The standard assumes that you use the low 4 bits of the last byte of the hash, regardless of its length. So replace 19 in the original DT definition with 31 for SHA-256 or 63 for SHA-512 and you are good to go. Finding this out wasn't completely straightforward, as the standard only has a ...
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