Jan 24, 2017 Java provides classes for the generation of RSA public and private key pairs with the package java.security. You can use RSA keys pairs in public key cryptography. Public key cryptography uses a pair of keys for encryption. Distribute the public key to whoever needs it but safely secure the private key.
- Nov 10, 2011 How to Generate A Public/Private SSH Key Linux By Damien â Posted on Nov 10, 2011 Nov 18, 2011 in Linux If you are using SSH frequently to connect to a remote host, one of the way to secure the connection is to use a public/private SSH key so no password is transmitted over the network and it can prevent against brute force attack.
- Dec 30, 2016 The key size (bit-length) of a public and private key pair decides how easily the key can be exploited with a brute force attack. The more computing power increases, it requires more strong keys to secure transmitting data.
- Nov 29, 2016 These keys are known as Public and Private Key Pair, and as the name implies the private key must remain private while the public key can be distributed. The most popular Public Key Algorithms are RSA, Diffie-Hellman, ElGamal, DSS.
- Oct 29, 2019 Parse RSA public and private key pair from string in Java - ParseRSAKeys.java. Parse RSA public and private key pair from string in Java - ParseRSAKeys.java. Skip to content. All gists Back to GitHub. Sign in Sign up. Openssl rsa -pubout -in privatekey.pem -out publickey.pem # convert private key to pkcs8 format in order to import it from.
gistfile1.java
importjava.security.KeyPairGenerator; |
importjava.security.KeyPair; |
importjava.security.PrivateKey; |
importjava.security.PublicKey; |
importjava.security.KeyFactory; |
importjava.security.spec.EncodedKeySpec; |
importjava.security.spec.PKCS8EncodedKeySpec; |
importjava.security.spec.X509EncodedKeySpec; |
importjava.security.spec.InvalidKeySpecException; |
importjava.security.NoSuchAlgorithmException; |
importcom.sun.jersey.core.util.Base64; |
publicclassGeneratePublicPrivateKeys { |
privatestaticvoidgenerateKeys(StringkeyAlgorithm, intnumBits) { |
try { |
// Get the public/private key pair |
KeyPairGenerator keyGen =KeyPairGenerator.getInstance(keyAlgorithm); |
keyGen.initialize(numBits); |
KeyPair keyPair = keyGen.genKeyPair(); |
PrivateKey privateKey = keyPair.getPrivate(); |
PublicKey publicKey = keyPair.getPublic(); |
System.out.println('n'+'Generating key/value pair using '+ privateKey.getAlgorithm() +' algorithm'); |
// Get the bytes of the public and private keys |
byte[] privateKeyBytes = privateKey.getEncoded(); |
byte[] publicKeyBytes = publicKey.getEncoded(); |
// Get the formats of the encoded bytes |
String formatPrivate = privateKey.getFormat(); // PKCS#8 |
String formatPublic = publicKey.getFormat(); // X.509 |
System.out.println('Private Key : '+Base64.encode(String.valueOf(privateKeyBytes))); |
System.out.println('Public Key : '+Base64.encode(String.valueOf(publicKeyBytes))); |
// The bytes can be converted back to public and private key objects |
KeyFactory keyFactory =KeyFactory.getInstance(keyAlgorithm); |
EncodedKeySpec privateKeySpec =newPKCS8EncodedKeySpec(privateKeyBytes); |
PrivateKey privateKey2 = keyFactory.generatePrivate(privateKeySpec); |
EncodedKeySpec publicKeySpec =newX509EncodedKeySpec(publicKeyBytes); |
PublicKey publicKey2 = keyFactory.generatePublic(publicKeySpec); |
// The original and new keys are the same |
System.out.println(' Are both private keys equal? '+ privateKey.equals(privateKey2)); |
System.out.println(' Are both public keys equal? '+ publicKey.equals(publicKey2)); |
} catch (InvalidKeySpecException specException) { |
System.out.println('Exception'); |
System.out.println('Invalid Key Spec Exception'); |
} catch (NoSuchAlgorithmException e) { |
System.out.println('Exception'); |
System.out.println('No such algorithm: '+ keyAlgorithm); |
} |
} |
publicstaticvoidmain(String[] args) { |
// Generate a 1024-bit Digital Signature Algorithm (DSA) key pair |
generateKeys('DSA', 1024); |
// Generate a 576-bit DH key pair |
generateKeys('DH', 576); |
// Generate a 1024-bit RSA key pair |
generateKeys('RSA', 1024); |
} |
} |
![Java code to generate public and private keys free Java code to generate public and private keys free](/uploads/1/2/6/0/126048481/198268100.png)
commented Mar 14, 2018
![Java code to generate public and private keys 2017 Java code to generate public and private keys 2017](/uploads/1/2/6/0/126048481/404020524.png)
Hi
You post is interestnig , is there away I can create a privatre key instance via a signature given stiring?
I have pub/private keys generated already
KeyPairGenerator keyPairGenerator is going to createa key pair, but in my case I alrady have it and then further want to use them for signign.
e.g
//ecdsaSign.initSign(keyPair.getPrivate());
byte[] pkInfo = '51114cac71a9575bc1b39104d176a39d81bd1a705b9a1ad32efd2222f13e59ad'.getBytes(); // PrivateKey pvtKey = DSAPrivateKey <<<<< create a private key here via above string. instead of keyPair created above. ecdsaSign.initSign(pvtKey); //byte[] publicKeyBytes = keyPair.getPublic().getEncoded(); byte[] publicKeyBytes = '025fe2d166a5a8ff005eb0c799a474174f5d061de266438c69d36c2032c6bff51a'.getBytes();
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How Public And Private Keys Work
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