w mod L as 32 little-endian bytes.scReduce
fn
ubyte[32] scReduce(scope const ref ubyte[64] w) nothrow @trusted @nogcReduces a 512-bit little-endian integer modulo the group order.
A fixed 260-iteration shift-subtract division: the shifted order starts at L << 259 and walks down to L, conditionally subtracting at every step. The iteration count depends only on the operand width, never on the value.
Parameters
w | Little-endian 64-byte value to reduce. |