:= make([]byte, 72), make([]byte, 72) for i := range a { bufA[i], bufB[i] = a[len(a)-i-1], b[len(b)-i-1] } // Perform a subtraction with borrow. var borrow uint64 for i := 0; i < len(bufA); i += 8 { limbA, limbB := byteorder.LEUint64(bufA[i:]), byteorder.LEUint64(bufB[i:]) _, borrow = bits.Sub64(limbA, limbB, borrow) } // If there is a borrow at the end of the operation, then a < b. return borrow == 1 } golang.org/fips140@v1.0.0/fips140/v1.0.0/ecdh/order_test.go // Copyright 2024 The Go Authors. All...