var crypto/elliptic.mask

2 uses

	crypto/elliptic (current package)
		elliptic.go#L281: var mask = []byte{0xff, 0x1, 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f}
		elliptic.go#L298: 		priv[0] &= mask[bitSize%8]