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Example of RSA generation, sign, verify, encryption, decryption and keystores in Java
- Rsa Algorithm For Key Generation And Cipher Verification In Java Pdf
- 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 Code
RsaExample.java
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); |
} |
} |
Rsa Algorithm For Key Generation And Cipher Verification In Java Pdf
commented Oct 17, 2019
Aug 30, 2016 The RSA Encryption Algorithm (1 of 2: Computing an Example) - Duration: 8:40. Eddie Woo 400,345 views. I'm looking for a Java sample how to do RSA Encryption with a given public key (I have it in base64 format, seems it is 1024 bit length). Below is my code, but I have InvalidKeySpec exception.
It's good thank you so much , How can i create base64 like jwt (header,body,sign) ? |
Write A Program In Java To Implement Rsa Algorithm For Key Generation And Cipher Verification
commented Nov 26, 2019
Rsa Algorithm For Key Generation And Cipher Verification In Java Code
Java generate rsa public private key pair. Thanks for the code. One issue - using openjdk version '11.0.5-ea' 2019-10-15 requires the KeyStore.getInstance('JCEKS') code to be KeyStore.getInstance('PKCS12') . |
commented Dec 29, 2019
@stdunbar: It depends on your keyStore creation. |
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