in lib/src/sha512_slowsinks.dart [127:133]
void _addTo2(Uint32List word1, int offset1, Uint32List word2, int offset2) {
int _addTemp;
_addTemp = word1[1 + offset1];
word1[1 + offset1] += word2[1 + offset2];
word1[0 + offset1] +=
word2[0 + offset2] + (word1[1 + offset1] < _addTemp ? 1 : 0);
}