val length0 = source.readByte().toInt() and 0xff
    val length =
      when {
        length0 == 0b1000_0000 -> {
          throw ProtocolException("indefinite length not permitted for DER")
        }

        (length0 and 0b1000_0000) == 0b1000_0000 -> {
          // Length specified over multiple bytes.
          val lengthBytes = length0 and 0b0111_1111
          if (lengthBytes > 8) {

b.v, c.v, got, exp) } } } } } } func BitRev8(n uint8) uint8 { var r uint8 r |= n >> 7 & 0b0000_0001 r |= n >> 5 & 0b0000_0010 r |= n >> 3 & 0b0000_0100 r |= n >> 1 & 0b0000_1000 r |= n << 1 & 0b0001_0000 r |= n << 3 & 0b0010_0000 r |= n << 5 & 0b0100_0000 r |= n << 7 & 0b1000_0000 return r } func CenteredMod(x, m uint32) int32 { x = x % m if x > m/2 { return int32(x) - int32(m) } return int32(x) } func reduceModQ(x int32) uint32 { x %= q if x < 0 { return uint32(x + q) } return uint32(x) } func TestCenteredMod(t...