* or 0x00000000 (value does not fit).
*
* We must iterate over all bytes of the source, _and_ possibly
- * some extra virutal bytes (with value 0) so as to cover the
+ * some extra virtual bytes (with value 0) so as to cover the
* complete modulus as well. We also add 4 such extra bytes beyond
* the modulus length because it then guarantees that no accumulated
* partial word remains to be processed.