the modulus. if bitLen(x.limbs[len(x.limbs)-1]) > bitLen(m.nat.limbs[len(m.nat.limbs)-1]) { return nil, errors.New("input overflows the modulus size") } x.maybeSubtractModulus(no, m) return x, nil } // bigEndianUint returns the contents of buf interpreted as a // big-endian encoded uint value. func bigEndianUint(buf []byte) uint { if _W == 64 { return uint(byteorder.BEUint64(buf)) } return uint(byteorder.BEUint32(buf)) } func (x *Nat) setBytes(b []byte) error { i, k := len(b), 0 for k < len(x.limbs)...