RSAUtils.java
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package com.bsth.controller.sys.util;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.SecureRandom;
import java.security.Security;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import javax.crypto.Cipher;
import org.apache.commons.net.util.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class RSAUtils {
private static final KeyPair keyPair = initKey();
static Logger logger = LoggerFactory.getLogger(RSAUtils.class);
private static KeyPair initKey(){
try {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
SecureRandom random = new SecureRandom();
KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "BC");
generator.initialize(1024, random);
return generator.generateKeyPair();
}catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* 生成public key
* @return
*/
public static String generateBase64PublicKey(){
RSAPublicKey key = (RSAPublicKey)keyPair.getPublic();
return new String(Base64.encodeBase64(key.getEncoded()));
}
/**
* 解密
* @param string
* @return
*/
public static String decryptBase64(String string) {
logger.info("decryptBase64 -[" + string + "]");
return new String(decrypt(Base64.decodeBase64(string)));
}
private static byte[] decrypt(byte[] string) {
try {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
Cipher cipher = Cipher.getInstance("RSA/None/PKCS1Padding", "BC");
RSAPrivateKey pbk = (RSAPrivateKey)keyPair.getPrivate();
cipher.init(Cipher.DECRYPT_MODE, pbk);
byte[] plainText = cipher.doFinal(string);
return plainText;
}catch (Exception e) {
throw new RuntimeException(e);
}
}
}