获得范围(x，y)中的随机BigInteger [英] get random BigInteger in range (x, y)

问题描述

我需要获取一个大于2 ^ 511且小于2 ^ 512的随机BigInteger.

I need to get a random BigInteger that is bigger than 2^511 and lower than 2^512.

推荐答案

byte[] bytes = new byte[64];    // 512 bits
new Random().nextBytes(bytes);
bytes[0] |= 0x80;               // set the most significant bit
return new BigInteger(1, bytes);

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