Author :
tb
Date :
2019-05-09 22:54:28
Hash :1ea2b3a0 Message :Fix incorrect carry operation in 512 bit addition: in the case
that there is already a carry and Sigma[i-1] == -1, the carry
must be kept.
From Dmitry Eremin-Solenik.
Fixes incorrect Streebog result reported by Guido Vranken.