Java Generate Ecc Key Pair
The following are top voted examples for showing how to use java.security.KeyPair.These examples are extracted from open source projects. You can vote up the examples you like and your votes will be used in our system to generate more good examples. Java provides the KeyPairGenerator class. This class is used to generate pairs of public and private keys. To generate keys using the KeyPairGenerator class, follow the steps given below. The KeyPairGenerator class provides getInstance method which accepts a String variable representing the. May 20, 2016 Step 1: Generate ephemeral ECDH key pair. The first step is to generate an ephemeral elliptic curve key pair for use in the algorithm. By setting the key size to 256-bits, Java will select the NIST P-256 curve parameters (secp256r1). For other key sizes, it will choose other NIST standard curves, e.g. P-384, P-521. The Generate ECC Key Pair (OPM, QC3GENECC; ILE, Qc3GenECCKeyPair) API generates a random ECC key pair given a set of domain parameters to be used with.
As of version 2.6.2 DidiSoft OpenPGP Library for Java fully supports Elliptic Curve cryptography (ECC) in OpenPGP as defined in RFC 6637. When keys are pressed a keyboard controller generates output. In this chapter we are going to make a short introduction to the new ECC encryption and illustrate how to generate your first ECC OpenPGP key pair.
In order to be able to create a digital signature, you need a private key. (Its corresponding public key will be needed in order to verify the authenticity of the signature.)
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.
In this example you will generate a public/private key pair for the Digital Signature Algorithm (DSA). You will generate keys with a 1024-bit length.
Generating a key pair requires several steps:
Create a Key Pair Generator
The first step is to get a key-pair generator object for generating keys for the DSA signature algorithm.
As with all engine classes, the way to get a KeyPairGenerator object for a particular type of algorithm is to call the getInstance static factory method on the KeyPairGenerator class. This method has two forms, both of which hava a String algorithm first argument; one form also has a String provider second argument.
A caller may thus optionally specify the name of a provider, which will guarantee that the implementation of the algorithm requested is from the named provider. The sample code of this lesson always specifies the default SUN provider built into the JDK.
Put the following statement after the
line in the file created in the previous step, Prepare Initial Program Structure:
Initialize the Key Pair Generator
The next step is to initialize the key pair generator. All key pair generators share the concepts of a keysize and a source of randomness. The KeyPairGenerator class has an initialize method that takes these two types of arguments.
The keysize for a DSA key generator is the key length (in bits), which you will set to 1024.
The source of randomness must be an instance of the SecureRandom class that provides a cryptographically strong random number generator (RNG). For more information about SecureRandom, see the SecureRandom API Specification and the Java Cryptography Architecture Reference Guide .
The following example requests an instance of SecureRandom that uses the SHA1PRNG algorithm, as provided by the built-in SUN provider. The example then passes this SecureRandom instance to the key-pair generator initialization method.
Some situations require strong random values, such as when creating high-value and long-lived secrets like RSA public and private keys. To help guide applications in selecting a suitable strong SecureRandom implementation, starting from JDK 8 Java distributions include a list of known strong SecureRandom implementations in the securerandom.strongAlgorithms property of the java.security.Security class. When you are creating such data, you should consider using SecureRandom.getInstanceStrong(), as it obtains an instance of the known strong algorithms.
Generate the Pair of Keys
The final step is to generate the key pair and to store the keys in PrivateKey and PublicKey objects.
- Java Cryptography Tutorial
- Message Digest and MAC
- Keys and Key Store
- Generating Keys
- Digital Signature
- Cipher Text
- Java Cryptography Resources
- Selected Reading
Java provides the KeyPairGenerator class. This class is used to generate pairs of public and private keys. To generate keys using the KeyPairGenerator class, follow the steps given below.
Step 1: Create a KeyPairGenerator object
The KeyPairGenerator class provides getInstance() method which accepts a String variable representing the required key-generating algorithm and returns a KeyPairGenerator object that generates keys.
Create KeyPairGenerator object using the getInstance() method as shown below.
Step 2: Initialize the KeyPairGenerator object
The KeyPairGenerator class provides a method named initialize() this method is used to initialize the key pair generator. This method accepts an integer value representing the key size.
Initialize the KeyPairGenerator object created in the previous step using this method as shown below.
Step 3: Generate the KeyPairGenerator
You can generate the KeyPair using the generateKeyPair() method of the KeyPairGenerator class. Generate the key pair using this method as shown below.
Step 4: Get the private key/public key
You can get the private key from the generated KeyPair object using the getPrivate() method as shown below.
You can get the public key from the generated KeyPair object using the getPublic() method as shown below.
Example
Following example demonstrates the key generation of the secret key using the KeyPairGenerator class of the javax.crypto package.
Java Generate Ecc Key Pair Key
Output
Generate Ecc Key Pair Java
The above program generates the following output −