return (*C.uint8_t)(unsafe.Pointer(&b[0]))
}

const wordBytes = bits.UintSize / 8

func bigToBN(x BigInt) *C.GO_BIGNUM {
	return C._goboringcrypto_BN_le2bn(wbase(x), C.size_t(len(x)*wordBytes), nil)
}

func bytesToBN(x []byte) *C.GO_BIGNUM {
	return C._goboringcrypto_BN_bin2bn((*C.uint8_t)(&x[0]), C.size_t(len(x)), nil)
}

func bnToBig(bn *C.GO_BIGNUM) BigInt {