生成密码随机数据

要生成加密随机数据的样本:

final byte[] sample = new byte[16];

new SecureRandom().nextBytes(sample);

System.out.println("Sample: " + DatatypeConverter.printHexBinary(sample));

产生的输出类似于:

Sample: E4F14CEA2384F70B706B53A6DF8C5EFE

注意,根据所使用的算法,对 nextBytes() 的调用可能会阻塞,同时收集熵。

要指定算法和提供程序:

final byte[] sample = new byte[16];
final SecureRandom randomness = SecureRandom.getInstance("SHA1PRNG", "SUN");

randomness.nextBytes(sample);

System.out.println("Provider: " + randomness.getProvider());
System.out.println("Algorithm: " + randomness.getAlgorithm());
System.out.println("Sample: " + DatatypeConverter.printHexBinary(sample));

产生的输出类似于:

Provider: SUN version 1.8
Algorithm: SHA1PRNG
Sample: C80C44BAEB352FD29FBBE20489E4C0B9