Java实现RSA加密解密,数字证书生成与验证

package net; import java.io.BufferedOutputStream; import java.io.BufferedReader; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.io.InputStreamReader; import java.io.ObjectOutputStream; import java.io.OutputStream; import java.net.Socket; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import util.FileUtils; import util.KeyUtils; import util.MD5Utils; import util.RSAUtils; import util.SignUtils; public class B { private String KEY_FILE="d:/test/B/BKey.dat"; private static String A_RSA_SIGN_FILE="d:/test/B/aRsaSign.dat"; private static String A_RSA_FILE="d:/test/B/aRsaTest.dat"; private static String SIGN_FILE="d:/test/B/sign.dat"; private static String FILE="d:/test/B/testResult.txt"; private static RSAPublicKey pubKey; private static RSAPrivateKey priKey; public void init(){ //创建目录 File f = new File("d:/test/B"); f.mkdirs(); KeyUtils.createPairKey(KEY_FILE); pubKey = (RSAPublicKey) FileUtils.getObjFromFile(KEY_FILE, 1); priKey = (RSAPrivateKey) FileUtils.getObjFromFile(KEY_FILE, 2); } public void start() throws Exception { Socket socket = new Socket("127.0.0.1", 520); InputStream is = socket.getInputStream(); DataInputStream dis = new DataInputStream(is); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); OutputStream os = socket.getOutputStream(); DataOutputStream dos = new DataOutputStream(os); ObjectOutputStream oos = new ObjectOutputStream(os); String str1 = dis.readUTF(); System.out.println(str1); String str2 = dis.readUTF(); System.out.println(str2); String str3 = br.readLine();//输入y System.out.println("【B】B的输入:"+str3); dos.writeUTF(str3); dos.flush(); System.out.println("【B】AB通话开始......"); System.out.println("【B】B传送公钥开始..."); oos.writeObject(pubKey); System.out.println("【B】B传送公钥完毕..."); System.out.println("【B】B开始接收密文........"); BufferedOutputStream bos = new BufferedOutputStream( new FileOutputStream(A_RSA_SIGN_FILE)); BufferedOutputStream bos2 = new BufferedOutputStream( new FileOutputStream(A_RSA_FILE)); long length=dis.readLong(); int a=0; int len=0; while (len<length) { a=dis.read(); bos.write(a); len++; } bos.close(); int b; while ((b = dis.read()) != -1) { bos2.write(b); } bos2.close(); System.out.println("【B】B接收密文完毕........"); System.out.println("【B】AB通话结束......"); socket.close(); } public static void main(String[] args) throws Exception { System.out.println("B:"); B b= new B(); b.init(); b.start(); System.out.println("【B】B开始解密密文..."); RSAUtils.decryptToFile(priKey, A_RSA_SIGN_FILE, SIGN_FILE); System.out.println("【B】B开始验证数字签名..."); boolean flag =SignUtils.validateSign(SIGN_FILE); if(flag){ System.out.println("【B】B数字签名验证通过..."); String info = (String) FileUtils.getObjFromFile(SIGN_FILE, 3); System.out.println("【B】从签名中得到明文的MD5值是："); System.out.println("【B】"+info); System.out.println("【B】开始计算接收到明文的MD5值..."); RSAUtils.decryptToFile(priKey, A_RSA_FILE, FILE); String md5 = MD5Utils.md5(FILE); System.out.println("【B】得出明文的MD5值是："); System.out.println("【B】"+md5); System.out.println("【B】比较MD5值，结果是："+info.equals(md5)+" (相同)"); } System.out.println("【B】操作完毕.........."); } }