Java Generate Public Private Key Pair

16.04.2020

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gistfile1.java

Windows Generate Private Public Key
Public And Private Key Pair
Java Generate Public Private Key Pair System

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

Dec 30, 2016 There are RSA, DSA, ECC (Elliptic Curve Cryptography) algorithms that are used to create a public and private key in public key cryptography (Asymmetric encryption). Due to security reason, the latest CA/Browser forum and IST advises to use 2048-bit RSA key. Oct 12, 2016 Angela from the API support team walks through how to generate a public private key pair using OpenSSL and register a private application. If you want to try integrating to Xero, partner with us. Apr 23, 2012 RSA authentication uses public and private keys instead of passwords to authenticate with the ESP Server. The Java keytool utility is used to generate RSA keys when the client is in Java. In some cases the key pair (private key and corresponding public key) are already available in files. In that case the program can import and use the private key for signing, as shown in Weaknesses and Alternatives. In other cases the program needs to generate the key pair. A key pair is generated by using the KeyPairGenerator class. Mar 03, 2020 Creating public/private key pairs Device authentication. The device uses a private key to sign a JSON Web Token (JWT). Generating an RSA key. If you're validating keys against registry-level certificates. Generating an Elliptic Curve keys. If you're validating keys against registry-level.

Generate key with openssl. 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();

-->

To sign an assembly with a strong name, you must have a public/private key pair. This public and private cryptographic key pair is used during compilation to create a strong-named assembly. You can create a key pair using the Strong Name tool (Sn.exe). Key pair files usually have an .snk extension.

Note

In Visual Studio, the C# and Visual Basic project property pages include a Signing tab that enables you to select existing key files or to generate new key files without using Sn.exe. In Visual C++, you can specify the location of an existing key file in the Advanced property page in the Linker section of the Configuration Properties section of the Property Pages window. The use of the AssemblyKeyFileAttribute attribute to identify key file pairs was made obsolete beginning with Visual Studio 2005.

Create a key pair

To create a key pair, at a command prompt, type the following command:

sn –k <file name>

In this command, file name is the name of the output file containing the key pair.

The following example creates a key pair called sgKey.snk.

If you intend to delay sign an assembly and you control the whole key pair (which is unlikely outside test scenarios), you can use the following commands to generate a key pair and then extract the public key from it into a separate file. First, create the key pair:

Next, extract the public key from the key pair and copy it to a separate file:

Windows Generate Private Public Key

Once you create the key pair, you must put the file where the strong name signing tools can find it. Rosetta stone activation code free.

Public And Private Key Pair

When signing an assembly with a strong name, the Assembly Linker (Al.exe) looks for the key file relative to the current directory and to the output directory. When using command-line compilers, you can simply copy the key to the current directory containing your code modules.