e196. generating a secure random number.txt

这里面包含了一百多个JAVA源文件

This example creates a random number using a secure random number generator: See also e195 Listing All Available Secure Random Number Generators. 
    try {
        // Create a secure random number generator
        SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
    
        // Get 1024 random bits
        byte[] bytes = new byte[1024/8];
        sr.nextBytes(bytes);
    
    
        // Create two secure number generators with the same seed
        int seedByteCount = 10;
        byte[] seed = sr.generateSeed(seedByteCount);
    
        sr = SecureRandom.getInstance("SHA1PRNG");
        sr.setSeed(seed);
        SecureRandom sr2 = SecureRandom.getInstance("SHA1PRNG");
        sr2.setSeed(seed);
    } catch (NoSuchAlgorithmException e) {
    }