cloud-manage-new/src/main/java/cn/com/taiji/manage/util/blockdatautils/RSA2.java

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package cn.com.taiji.manage.util.blockdatautils;

import com.google.common.collect.Maps;

import javax.crypto.Cipher;
import java.io.ByteArrayOutputStream;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;


public class RSA2 {

	/**
	 * RSA最大加密明文大小
	 */
	private static final int MAX_ENCRYPT_BLOCK = 117;

	/**
	 * RSA最大解密密文大小
	 */
	private static final int MAX_DECRYPT_BLOCK = 128;

	public static byte[] sign(byte data[], String privateKey) throws Exception {
		byte keyBytes[] = BASE64.decode(privateKey);
		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance("RSA");
		PrivateKey priKey = keyFactory
				.generatePrivate(pkcs8KeySpec);
		Signature signature = Signature.getInstance("MD5withRSA");
		signature.initSign(priKey);
		signature.update(data);
		return signature.sign();
	}

	public static boolean verify(byte data[], String publicKey, byte signByte[])
			throws Exception {
		byte keyBytes[] = BASE64.decode(publicKey);
		X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance("RSA");
		PublicKey pubKey = keyFactory.generatePublic(keySpec);
		Signature signature = Signature.getInstance("MD5withRSA");
		signature.initVerify(pubKey);
		signature.update(data);
		return signature.verify(signByte);
	}

	public static byte[] decryptByPrivateKey(byte data[], String key)
			throws Exception {
		byte keyBytes[] = BASE64.decode(key);
		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance("RSA");
		Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
		Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
		cipher.init(2, privateKey);