f (unsigned short Z[48]) { int j; unsigned short t1, t2, t3, T[48]; unsigned short *p = T + 48; for (j = 1; j < 8; j++) { t1 = *Z++; *--p = *Z++; *--p = t1; t1 = inv(*Z++); t2 = -*Z++; t3 = -*Z++; *--p = inv(*Z++); *--p = t2; *--p = t3; *--p = t1; } }