The KeyPairGenerator class is used to generate pairs of public and private keys. Key pair generators are constructed using the

Generate Key Pair. Generating a public key / private key pair is one of the most common tasks to use the Java Keytool for. The generated key pair is inserted into a Java KeyStore file as a self signed key pair. Here is the general command line format for generating a key pair with the Keytool. You're generating a static key pair which can be used for authentication. When using a ECDHE ciphersuite you'll need to generate a ephemeral key pair as well, but this is hidden in the TLS implementation. Fortunately generating ECC key pairs is relatively fast: just randomization and point multiplication. This is one of the main benefits of. Topic - (1) Using keytool to generate a public-private key pair. The first step in configuring a VT Display session for SSH client authentication using a public key is to use the keytool program to generate a public-private key pair. About keytool. Keytool is a multipurpose utility program, included in the Java 2 Version 1.4 JRE and distributed with Host On-Demand, for managing.

getInstance factory methods (static methods that return instances of a given class).

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 only difference between the two is the initialization of the object:

• Algorithm-Independent Initialization

  All key pair generators share the concepts of a keysize and a source of randomness. The keysize is interpreted differently for different algorithms (e.g., in the case of the DSA algorithm, the keysize corresponds to the length of the modulus). There is an initialize method in this KeyPairGenerator class that takes these two universally shared types of arguments. There is also one that takes just a keysize argument, and uses the SecureRandom implementation of the highest-priority installed provider as the source of randomness. (If none of the installed providers supply an implementation of SecureRandom, a system-provided source of randomness is used.)

  Since no other parameters are specified when you call the above algorithm-independent initialize methods, it is up to the provider what to do about the algorithm-specific parameters (if any) to be associated with each of the keys.

  If the algorithm is the DSA algorithm, and the keysize (modulus size) is 512, 768, or 1024, then the Sun provider uses a set of precomputed values for the p, q, and g parameters. If the modulus size is not one of the above values, the Sun provider creates a new set of parameters. Other providers might have precomputed parameter sets for more than just the three modulus sizes mentioned above. Still others might not have a list of precomputed parameters at all and instead always create new parameter sets.

• Algorithm-Specific Initialization

  For situations where a set of algorithm-specific parameters already exists (e.g., so-called community parameters in DSA), there are two initialize methods that have an AlgorithmParameterSpec argument. One also has a SecureRandom argument, while the the other uses the SecureRandom implementation of the highest-priority installed provider as the source of randomness. (If none of the installed providers supply an implementation of SecureRandom, a system-provided source of randomness is used.)

In case the client does not explicitly initialize the KeyPairGenerator (via a call to an initialize method), each provider must supply (and document) a default initialization. For example, the Sun provider uses a default modulus size (keysize) of 1024 bits.

Note that this class is abstract and extends from KeyPairGeneratorSpi for historical reasons. Application developers should only take notice of the methods defined in this KeyPairGenerator class; all the methods in the superclass are intended for cryptographic service providers who wish to supply their own implementations of key pair generators.

Every implementation of the Java platform is required to support the following standard KeyPairGenerator algorithms and keysizes in parentheses: Keygen software license key generator free download.

• DiffieHellman (1024)
• DSA (1024)
• RSA (1024, 2048)

These algorithms are described in the KeyPairGenerator section of the Java Cryptography Architecture Standard Algorithm Name Documentation. Consult the release documentation for your implementation to see if any other algorithms are supported.

As of version 2.6.2 DidiSoft OpenPGP Library for Java fully supports Elliptic Curve cryptography (ECC) in OpenPGP as defined in RFC 6637.

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.

1. What is Elliptic Curve cryptography?
2. Generating an ECC OpenPGP key pair
3. Industry support

Generate Ec Key Pair Java

What is Elliptic Curve cryptography?

Elliptic Curve cryptography provides asymmetric (public key) cryptography based on mathematic operations with Elliptic Curves over finite fields.

An ECC OpenPGP key consists of a master key which is used for EC DSA signing and an encryption sub key which is used for EC Diffie-Hellman (ECDH) encryption. Android facebook sdk generate relase key cordova.

Currently the standard for ECC in OpenPGP (RFC 6637) defines three elliptic curves over the finite field of prime numbers introduced by the National Security Agency (NSA) during the 2005 RSA conference: NIST P-256, NIST P-384, NIST-521 (the number shows the finite field of prime numbers with the same size in bits).

Some OpenPGP implementations like GnuPG/gpg has added support for Brainpool curves as well, which we support too as of version 3.1.3.

Comparison with RSA and ElGamal (DH/DSS)

The weakest ECC OpenPGP key pairs (over curve NIST-256) can be compared with a 3072 bit ElGamal or 3072 bit RSA key pair.

Please check section “Security considerations” for more information.

Generating an ECC OpenPGP key pair

Creating an ECC OpenPGP key pair is done with a new set of methods with common name generateEccKeyPair, available in the KeyStore and PGPKeyPair classes.

The supported values for the ECC curve are :

Below is an example that shows how to generate an ECC key pair with no expiration date and default cipher, compression and hashing key preferences.

Industry support

The following software products are known to support ECC in OpenPGP as of the time of this writing:

Symantec PGP Command line 10.2.+

GnuPG 2.1+

Summary

This chapter introduced the new Elliptic Curve (ECC) OpenPGP keys defined in RFC 6637 . As of version 2.6.2 DidiSoft OpenPGP Library for Java fully supports this extension of the OpenPGP standard.

Usage of the new type of OpenPGP keys is transparent once you upgrade to version 2.6.2 or above.

Java Generate Ec Key Pair Key

Key generation is done though the methods generateEccKeyPair available in the KeyStore and PGPKeyPair classes.