- Rsa Algorithm For Key Generation And Cipher Verification In Java 10
- Write A Program In Java To Implement Rsa Algorithm For Key Generation And Cipher Verification
- Rsa Algorithm For Key Generation And Cipher Verification In Java Free
Nov 18, 2019 InkDeck (a play on the real title, EncDec (Encrypt/Decrypt)) is an application that uses RSA encryption for secure communications. The application can encrypt messages using RSA as well as decrypt them. The user is able to select public/private keys. Also includes KeyMaker, to generate a private and public key. I know how to generate rsa keys and encrypt an decrypt. My question what the difference is between a Java generated rsa key and a rsa key generated with openssh. Is there a way to convert this key in java? – Ralph Oct 23 '13 at 6:33. Java program to encrypt and decrypt a given message using RSA algorithm. Open Command Prompt and compile & Run. RSA algorithm is used to changing message that no one can understand the communication between sender and receiver. Sender and Receiver have public and private key and they can only understand message.
| importjavax.crypto.Cipher; |
| importjava.io.InputStream; |
| importjava.security.*; |
| importjava.util.Base64; |
| import staticjava.nio.charset.StandardCharsets.UTF_8; |
| publicclassRsaExample { |
| publicstaticKeyPairgenerateKeyPair() throwsException { |
| KeyPairGenerator generator =KeyPairGenerator.getInstance('RSA'); |
| generator.initialize(2048, newSecureRandom()); |
| KeyPair pair = generator.generateKeyPair(); |
| return pair; |
| } |
| publicstaticKeyPairgetKeyPairFromKeyStore() throwsException { |
| //Generated with: |
| // keytool -genkeypair -alias mykey -storepass s3cr3t -keypass s3cr3t -keyalg RSA -keystore keystore.jks |
| InputStream ins =RsaExample.class.getResourceAsStream('/keystore.jks'); |
| KeyStore keyStore =KeyStore.getInstance('JCEKS'); |
| keyStore.load(ins, 's3cr3t'.toCharArray()); //Keystore password |
| KeyStore.PasswordProtection keyPassword =//Key password |
| newKeyStore.PasswordProtection('s3cr3t'.toCharArray()); |
| KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry) keyStore.getEntry('mykey', keyPassword); |
| java.security.cert.Certificate cert = keyStore.getCertificate('mykey'); |
| PublicKey publicKey = cert.getPublicKey(); |
| PrivateKey privateKey = privateKeyEntry.getPrivateKey(); |
| returnnewKeyPair(publicKey, privateKey); |
| } |
| publicstaticStringencrypt(StringplainText, PublicKeypublicKey) throwsException { |
| Cipher encryptCipher =Cipher.getInstance('RSA'); |
| encryptCipher.init(Cipher.ENCRYPT_MODE, publicKey); |
| byte[] cipherText = encryptCipher.doFinal(plainText.getBytes(UTF_8)); |
| returnBase64.getEncoder().encodeToString(cipherText); |
| } |
| publicstaticStringdecrypt(StringcipherText, PrivateKeyprivateKey) throwsException { |
| byte[] bytes =Base64.getDecoder().decode(cipherText); |
| Cipher decriptCipher =Cipher.getInstance('RSA'); |
| decriptCipher.init(Cipher.DECRYPT_MODE, privateKey); |
| returnnewString(decriptCipher.doFinal(bytes), UTF_8); |
| } |
| publicstaticStringsign(StringplainText, PrivateKeyprivateKey) throwsException { |
| Signature privateSignature =Signature.getInstance('SHA256withRSA'); |
| privateSignature.initSign(privateKey); |
| privateSignature.update(plainText.getBytes(UTF_8)); |
| byte[] signature = privateSignature.sign(); |
| returnBase64.getEncoder().encodeToString(signature); |
| } |
| publicstaticbooleanverify(StringplainText, Stringsignature, PublicKeypublicKey) throwsException { |
| Signature publicSignature =Signature.getInstance('SHA256withRSA'); |
| publicSignature.initVerify(publicKey); |
| publicSignature.update(plainText.getBytes(UTF_8)); |
| byte[] signatureBytes =Base64.getDecoder().decode(signature); |
| return publicSignature.verify(signatureBytes); |
| } |
| publicstaticvoidmain(String... argv) throwsException { |
| //First generate a public/private key pair |
| KeyPair pair = generateKeyPair(); |
| //KeyPair pair = getKeyPairFromKeyStore(); |
| //Our secret message |
| String message ='the answer to life the universe and everything'; |
| //Encrypt the message |
| String cipherText = encrypt(message, pair.getPublic()); |
| //Now decrypt it |
| String decipheredMessage = decrypt(cipherText, pair.getPrivate()); |
| System.out.println(decipheredMessage); |
| //Let's sign our message |
| String signature = sign('foobar', pair.getPrivate()); |
| //Let's check the signature |
| boolean isCorrect = verify('foobar', signature, pair.getPublic()); |
| System.out.println('Signature correct: '+ isCorrect); |
| } |
| } |
commented Oct 17, 2019
Rsa Algorithm For Key Generation And Cipher Verification In Java 10
It's good thank you so much , How can i create base64 like jwt (header,body,sign) ? |
commented Nov 26, 2019
Thanks for the code. One issue - using |
Write A Program In Java To Implement Rsa Algorithm For Key Generation And Cipher Verification
commented Dec 29, 2019
Rsa Algorithm For Key Generation And Cipher Verification In Java Free
@stdunbar: It depends on your keyStore creation. |