Java Code To Generate Public And Private Keys
- How To Generate Public And Private Key In Java
- Java Code To Generate Public And Private Keys 2017
- Java Public And Private Variables
- Java Code To Generate Public And Private Keys Work
How To Generate Public And Private Key In Java
Next, VerSig needs to import the encoded public key bytes from the file specified as the first command line argument and to convert them to a PublicKey.A PublicKey is needed because that is what the Signature initVerify method requires in order to initialize the Signature object for verification. (Java) Generate RSA SSH Key. Generates an RSA SSH key and saves to various public and private key file formats (OpenSSH and PuTTY). 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.
| 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 2017
commented Mar 14, 2018
Java Public And Private Variables
Hi https://betterrenew209.weebly.com/blog/flaming-pear-flood-download-mac. You post is interestnig , is there away I can create a privatre key instance via a signature given stiring? Sap ides developer access key generator. 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()); |