rsa algorithm in java

Do this thing in the pit climbed for 3 days before crawling out, record for the Garden Friends reference. C # Programmer, a project needs to do data interaction with Java, the other side dumped Chimi and a CER certificate to me, and then I want to decrypt its ciphertext. RSA Asymmetric encryption, the other side with the private key encryption, I use the public key decryption. A note about certificates: The

Java and net RSA key formats are converted to each other (public key, private key)Not much to say directly on the code, you need to reference the Open source class library BouncyCastle.Crypto.dllYou can also download the http://downloads.bouncycastle.org/csharp/bccrypto-net-1.7-bin.zip hereThe following is the conversion code1 usingSystem;2 usingSystem.Xml;3 usingOrg.BouncyCastle.Asn1.Pkcs;4 usingOrg.Bouncy

RSA, JAVA private key encryption, C # Public Key decryption, It took three days to climb this thing in the pit and record it for reference by park friends. C # A programmer. The project needs to interact with Java. The other party throws the segment ciphertext and sends a CER certificate to me. Then I want to decrypt the ciphertext.

In web development, using RSA public Key system to make Ukey, file certificate Landing, the common practice is: the browser side of the use of C + + ActiveX control, using C + + Third library OpenSSL for RAS add-sign operation, The client's signature is checked by Java on the server side. This involves the process of verifying the identity of the client with the interactive plus check between C + + OpenSSL

(publickey.getencoded ())); //get the private key and print it in base64 formatPrivatekey Privatekey =keypair.getprivate (); System.out.println ("Private key:" +NewString (Base64.getencoder (). Encode (privatekey.getencoded ())); //Public Key Cryptography byte[] Encryptedbytes =Encrypt (Data.getbytes (), PublicKey); System.out.println ("After encryption:" +NewString (encryptedbytes)); //private Key Decryption byte[] Decryptedbytes =Decrypt (encryptedbytes, Privatekey); System.out.

Try{ //1 initializing the secret keyKeypairgenerator keypairgenerator = keypairgenerator.getinstance ("RSA"); Keypairgenerator.initialize (512); KeyPair KeyPair=Keypairgenerator.generatekeypair (); Rsapublickey Rsapublickey=(Rsapublickey) keypair.getpublic (); Rsaprivatekey Rsaprivatekey=(Rsaprivatekey) keypair.getprivate (); //2 Execute SignaturePkcs8encodedkeyspec Pkcs8encodedkeyspec =NewPkcs8encodedkeyspec (rsaprivatekey.getencoded ());

= new Base64decoder (); Byte[] B1 = Decoder.decodebuffer (cryptograph); Byte[] B = cipher.dofinal (B1); return new String (b); } /*public static void Main (string[] args) {try {New Rsa_test (1024x768, "e:/");System.out.println ("");String geteptstr = Encrypt ("Wuchao");System.out.println ("Geteptstr:" +geteptstr);String drpstr = Decrypt (GETEPTSTR);System.out.println ("Drpstr:" +drpstr);}catch (IOException ex) {Ex.printstacktrace ();}catch (NoSuchAlgorithmException ex) {Ex.printstacktrace ()

For Java and C # encryption and decryption communication, you can use this Bouncycastle plugin, will help you solve a lot of problemshttp://www.bouncycastle.org///C # uses Java-given public key for RSA encryption Public Static byte[] Rsaencrypt (stringPublicKey,stringcontent) {RSACryptoServiceProvider RSA=NewRSACryptoS

The first time I wrote a blog.Recently want to do a Web automatic login, the user name and password is RSA encrypted, the background is used in Java, I will only point C #, grab the package everything is done (using the fiddler), but because of C # and RSA Encryption way, I did n days, are uncertain, in the middle asked a lot of people, The people who are willing

Java Implementation of Radius secondary verification based on RSA securID (PAP authentication method) and securidradius Secondary Verification Based on rsa SecurID. The RSA server itself can be used as a Radius server, RSA can also be used with other software sets, and other

In the current version of the company's middleware communication framework, in order to prevent non-authorized third-party and expired client connection, we have AES and RSA two ways of encryption and decryption policy authentication. For asymmetric RSA encryption and decryption, because its performance is expensive, it is generally used only for authentication connection, not for each message itself encryp

"); Keypairgenerator.initialize (512); returnKeypairgenerator.generatekeypair (); } /*** * This method describes: get the public key * *@author: Aarony *@version: June 20, 2018 PM 9:37:13*/ Public StaticString Getpublickey (KeyPair KeyPair) {publickey key=keypair.getpublic (); returnbyte2base64 (key.getencoded ()); } /*** * This method describes: get the public key * *@author: Aarony *@version: June 20, 2018 PM 9:37:13*/ Public StaticString Getprivatekey (KeyPair KeyPair) {Privatek

(Removemszero (pvkkey.getcrtcoefficient () -. Tobytearray ())) + "); the +Buff.append (" A+Codeutils.base64encode (Removemszero (pvkkey.getprivateexponent () the. Tobytearray ())) + "); +Buff.append ("); - $ returnBuff.tostring (). ReplaceAll ("[\t\n\r]", ""); $}Catch(Exception e) { - System.err.println (e); - return NULL; the } - }Wuyi the Private StaticString Getrsapublickeyasnetformat (byte[] encodedpublickey) { - Try { Wu -Keyfactory keyfa

byte[] Expbytes =base64.decodebase64 (Exponentelem.gettext (). Trim ()));byte[] Modbytes =base64.decodebase64 (Moduluselem.gettext (). Trim ());byte[] Dbytes =base64.decodebase64 (Delem.gettext (). Trim ()); BigInteger Modules=NewBigInteger (1, modbytes); BigInteger exponent=NewBigInteger (1, expbytes); BigInteger D=NewBigInteger (1, dbytes); Keyfactory Factory= Keyfactory.getinstance ("RSA"); Cipher Cipher= Cipher.getinstance ("

[HTML]View plain copy package utils; [HTML] View Plain copy importjava.io.bytearrayoutputstream; importjava.security.key; importjava.security.keyfactory; importjava.security.keypair; importjava.security.keypairgenerator; importjava.security.privatekey; Import java.security.PublicKey; importjava.security.signature; import java.security.interfaces.rsaprivatekey; importjava.security.interfaces.rsapublickey; importjava.security.spec.pkcs8encodedkeyspec; import java.security.spec.x509encodedkeyspec

Import Java.security.keypair;import Java.security.privatekey;import Java.security.publickey;import Java.security.securerandom;public class Generatekeypair {private string prikey;private string pubkey;public void Run () { try {java.security.KeyPairGenerator keygen = java.security.KeyPairGenerator.getInstance ("RSA"); SecureRandom Secrand = new SecureRandom (); Secrand.setseed ("Java". GetBytes ()); Initializ

Two-time verification based on RSA SecurID. RSA server itself can be used as a RADIUS server, RSA can and other software collections, use other server as RADIUS server.The general flow of RADIUS validation is as follows:The main code implemented in Java is implemented as follows (need to import radius-related jar packa

Java.security.interfaces.rsapublickey;import Java.security.spec.pkcs8encodedkeyspec;import Java.security.spec.x509encodedkeyspec;import Java.util.hashmap;import Java.util.map;import javax.crypto.Cipher;/* * * Base64utils.java Import Java.io.bytearrayinputstream;import Java.io.bytearrayoutputstream;import Java.io.file;import Java.io.fileinputstream;import Java.io.fileoutputstream;import Java.io.inputstream;import Java.io.OutputStream; Import it.sauronsoftware.base64.base64;/** * Rsatest

Java RSA generates the public key private key, and javarsa generates /*** The imported package is a jar package that comes with Java * Key-related package * base64 codec * encoding only */import java. security. key; import java. security. keyPair; import

/*************************************** ***************************************** $ Header $* $ Revision $* $ Date $** ===================================================== ========================================================** Copyright (c) 2001-2004.* All Rights Reserved.** Created on 2004-11-15**************************************** ***************************************/ Import java. Math. biginteger; /*** Todo enter the class information h