Public Private Key Generator Java
- Public Private Key Generator Java Code
- Public Private Key Generator Java Pdf
- Public Private Key Generator Java Software
A Key pair generator for a particular algorithm creates a public/private key pair that can be used with this algorithm. It also associates algorithm-specific parameters with each of the generated keys. There are two ways to generate a key pair: in an algorithm-independent manner, and in an algorithm-specific manner.
The Java KeyPairGenerator class (java.security.KeyPairGenerator) is used to generate asymmetric encryption / decryption key pairs. Public Key, Private Key Type Key Pairs The most commonly known type of asymmetric key pair is the public key, private key type of. 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. Every public key is in turn linked to a private key. A private key can always be used to generate its associated public key, but not vice versa. (A private key and its associated public key make up a key pair.) All your public keys are visible by everyone using the network. The private keys, however, should never be shared or given away. KeyPairGenerator generator. KeyPairGenerator is an engine class which is capable of generating a private key and its related public key utilizing the algorithm it.
| 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); |
| } |
| } |
commented Mar 14, 2018
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 /generate-another-ssh-key-mac.html. //ecdsaSign.initSign(keyPair.getPrivate()); |
The code snippet below show you how to use the JDK Security API to generate public and private keys. A private key can be use to sign a document and the public key is use to verify that the signature of the document is valid.
Public Private Key Generator Java Code
The API we use to generate the key pairs is in the java.security package. That’s mean we have to import this package into our code. The class for generating the key pairs is KeyPairGenerator. To get an instance of this class we have to call the getInstance() methods by providing two parameters. garageband mac old version The first parameter is algorithm and the second parameter is the provider.
After obtaining an instance of the key generator we have to initialize it. The initialize() method takes two parameters, the key size and a source of randomness. We set the key size to 1024 and pass and instance of SecureRandom.
Finally to generate the key pairs we call the generateKeyPair() method of the KeyPairGenerator class. This will return a KeyPair object from where we can get the PrivateKey and PublicKey by calling the getPrivate() and getPublic() method.
Public Private Key Generator Java Pdf
Let’s see the code snippet below:
Public Private Key Generator Java Software
- How do I backup MySQL databases in Ubuntu? - December 16, 2019
- How do I set the time of java.util.Date instance to 00:00:00? - October 24, 2019
- How to Install Consolas Font in Mac OS X? - March 29, 2019