Java 中的 SecureRandom generateSeed()方法，示例
原文:https://www . geeksforgeeks . org/secureandom-generated-method-in-Java-with-examples/
Java . security . secureandom类的 generateSeed() 方法用于返回给定的种子字节数，该字节数是使用该类用来给自身播种的种子生成算法计算的。此调用可用于播种其他随机数生成器。
语法:
public byte[] generateSeed(int numBytes)
参数:该方法以要生成的种子字节数为参数。
返回值:该方法返回生成的种子字节。
以下是说明generate seeded()方法的示例:
注意:
- This program will not run on the online IDE.
- Every security random class will produce random output.
例 1:
爪哇
// Java program to demonstrate
// generateSeed() method
import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
{
try {
// creating the object of SecureRandom
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
// getting the generated seed by into byte array
// by using method generateSeed()
byte[] arr = sr.generateSeed(8);
// printing the byte array
System.out.println(Arrays.toString(arr));
}
catch (NoSuchAlgorithmException e) {
System.out.println("Exception thrown : " + e);
}
}
}
输出:
[24, -16, -12, 25, -3, 66, -90, 103]
例 2:
爪哇
// Java program to demonstrate
// generateSeed() method
import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
{
try {
// creating the object of SecureRandom getting the instance of TAJMAHAL
System.out.println("Trying to get the instance from an unknown source");
SecureRandom sr = SecureRandom.getInstance("TAJMAHAL");
// getting the generated seed by into byte array
// by using method generateSeed()
byte[] arr = sr.generateSeed(5);
// printing the byte array
System.out.println("Seed Bytes: " + Arrays.toString(arr));
}
catch (NoSuchAlgorithmException e) {
System.out.println("Exception thrown : " + e);
}
}
}
输出:
Trying to get the instance from an unknown source
Exception thrown : java.security.NoSuchAlgorithmException: TAJMAHAL SecureRandom not available
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