本文实例讲述了java实现的AES秘钥生成算法。分享给大家供大家参考,具体如下:
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import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
public class Test {
public static void main(String[] args) {
getKey();
getKeyByPass();
}
/**
* 随机生成秘钥
*/
public static void getKey() {
try {
KeyGenerator kg = KeyGenerator.getInstance( "AES" );
kg.init( 128 );
//要生成多少位,只需要修改这里即可128, 192或256
SecretKey sk = kg.generateKey();
byte [] b = sk.getEncoded();
String s = byteToHexString(b);
System.out.println(s);
System.out.println( "十六进制密钥长度为" +s.length());
System.out.println( "二进制密钥的长度为" +s.length()* 4 );
}
catch (NoSuchAlgorithmException e) {
e.printStackTrace();
System.out.println( "没有此算法。" );
}
}
/**
* 使用指定的字符串生成秘钥
*/
public static void getKeyByPass() {
//生成秘钥
String password= "testkey" ;
try {
KeyGenerator kg = KeyGenerator.getInstance( "AES" );
// kg.init(128);//要生成多少位,只需要修改这里即可128, 192或256
//SecureRandom是生成安全随机数序列,password.getBytes()是种子,只要种子相同,序列就一样,所以生成的秘钥就一样。
kg.init( 128 , new SecureRandom(password.getBytes()));
SecretKey sk = kg.generateKey();
byte [] b = sk.getEncoded();
String s = byteToHexString(b);
System.out.println(s);
System.out.println( "十六进制密钥长度为" +s.length());
System.out.println( "二进制密钥的长度为" +s.length()* 4 );
}
catch (NoSuchAlgorithmException e) {
e.printStackTrace();
System.out.println( "没有此算法。" );
}
}
/**
* byte数组转化为16进制字符串
* @param bytes
* @return
*/
public static String byteToHexString( byte [] bytes) {
StringBuffer sb = new StringBuffer();
for ( int i = 0 ; i < bytes.length; i++) {
String strHex=Integer.toHexString(bytes[i]);
if (strHex.length() > 3 ) {
sb.append(strHex.substring( 6 ));
} else {
if (strHex.length() < 2 ) {
sb.append( "0" + strHex);
} else {
sb.append(strHex);
}
}
}
return sb.toString();
}
}
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希望本文所述对大家java程序设计有所帮助。