go

How to create a big int with a secure random

I have this code in java and I need to reproduce in Go.

String nonce = new BigInteger(130, new SecureRandom()).toString(32);

Is the only way to generate a nonce for GDS amadeus soap header 4.

Thanks

Solution

  • Use package math/big and crypto/rand. The snippet looks like:

    //Max random value, a 130-bits integer, i.e 2^130 - 1
max := new(big.Int)
max.Exp(big.NewInt(2), big.NewInt(130), nil).Sub(max, big.NewInt(1))

//Generate cryptographically strong pseudo-random between 0 - max
n, err := rand.Int(rand.Reader, max)
if err != nil {
    //error handling
}

//String representation of n in base 32
nonce := n.Text(32)

    A working example can be found at The Go Playground.