Java RSA 加密

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/zhangbinlong/article/details/78663190

package com.dataservice.utils.crypto;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.util.Enumeration;

import lombok.extern.slf4j.Slf4j;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.bouncycastle.util.encoders.Base64;

import com.dataservice.utils.DsContent;

/**
 * 3DES加密
 * 
 * @version 1.0
 * @author
 * 
 */
@Slf4j
public class EncDecUtil {
    private EncDecUtil() {
    }

    /**
     * 获取证书私钥
     * 
     * @return
     * @throws IOException
     */
    public static String getCertKey(String mi, String path) {
        try {
            InputStream is = new FileInputStream(path);
            return getCertKey(mi, is);
        } catch (FileNotFoundException e) {
            log.error("read file error", e);
        }
        return null;
    }

    /**
     * 获取证书私钥
     * 
     * @return
     * @throws IOException
     */
    public static String getCertKey(String mi, InputStream is) {

        String billRsaKey = "";
        try {
            KeyStore ks = KeyStore.getInstance("PKCS12");
            ks.load(is, mi.toCharArray());
            Enumeration<String> enuma = ks.aliases();
            String keyAlias = null;
            if (enuma.hasMoreElements()) {
                keyAlias = (String) enuma.nextElement();
            }

            PrivateKey privatekey = (PrivateKey) ks.getKey(keyAlias, mi.toCharArray());
            billRsaKey = StringUtils.toEncodedString(Base64.encode(privatekey.getEncoded()), DsContent.DATA_CHARSET);
        } catch (Exception e) {
            log.error("get private key error", e);
        } finally {
            IOUtils.closeQuietly(is);
        }
        return billRsaKey;
    }

    /**
     * 获取证书公钥
     * 
     * @return
     * @throws IOException
     */
    public static String getPublicCertKey(String path) {

        String publicCertPath = path;// "D://dev2.cer";
        String billRsaKey = "";
        try {

            // 签名 公钥解密
            CertificateFactory cff = CertificateFactory.getInstance("X.509");
            FileInputStream fis1 = new FileInputStream(publicCertPath); // 证书文件
            Certificate cf = cff.generateCertificate(fis1);
            PublicKey publicKey = cf.getPublicKey();

            byte[] pk = publicKey.getEncoded();
            billRsaKey = StringUtils.toEncodedString(Base64.encode(pk), DsContent.DATA_CHARSET);

        } catch (Exception e) {
            log.error("get public key error", e);
        }
        return billRsaKey;
    }

}