JAVA RSA加密解密代码范例(byte[]版)
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具体代码:
package tsoffice;
import javax.crypto.Cipher;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
public final class TestRSA
{
private final static String ALGORITHM = "RSA";
private final static String CHARSET = "utf-8";
/**
* 密钥长度 于原文长度对应 以及越长速度越慢
*/
private final static int KEY_SIZE = 512;
private static PublicKey publicKey;
private static PrivateKey privateKey;
/**
* 随机生成密钥对
*/
public static void genKeyPair() throws NoSuchAlgorithmException {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(ALGORITHM);
keyPairGen.initialize(KEY_SIZE, new SecureRandom());
KeyPair keyPair = keyPairGen.generateKeyPair();
publicKey = keyPair.getPublic();
privateKey = keyPair.getPrivate();
}
public static byte[] encrypt(String str, PublicKey pubKey) throws Exception {
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
return cipher.doFinal(str.getBytes(CHARSET));
}
public static byte[] decrypt(byte[] inputByte, PrivateKey priKey) throws Exception {
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, priKey);
return cipher.doFinal(inputByte);
}
public static void main(String[] args) throws Exception {
long temp = System.currentTimeMillis();
//生成公钥和私钥
genKeyPair();
System.out.println("生成密钥消耗时间:" + (System.currentTimeMillis() - temp) / 1000.0 + "秒");
String message = "公钥加密测试-:泰山Office";
System.out.println("原文:" + message);
temp = System.currentTimeMillis();
byte[] messageEn = encrypt(message, publicKey);
System.out.println("密文:" + messageEn.length);
System.out.println("加密消耗时间:" + (System.currentTimeMillis() - temp) / 1000.0 + "秒");
temp = System.currentTimeMillis();
byte[] messageDe = decrypt(messageEn, privateKey);
System.out.println("解密:" + new String(messageDe));
System.out.println("解密消耗时间:" + (System.currentTimeMillis() - temp) / 1000.0 + "秒");
}
}
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