$b = ($b + (($a + $f + $k[$i] + $w[$g]) << $r[$i])) % (2**32);

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Might not give the right result. "The result of overflowing the range of the integers is undefined" according to the docs. You need to do the proper masking *before* the shift, not after.

In reply to Re^3: MD5 -- not digest::md5 by ikegami
in thread MD5 -- not digest::md5 by Oromis92

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