ALGRSACRT KeyPair object containing a RSA key pair with private key in its Chinese Remainder Theorem form. Constructor Summary KeyPair (byte algorithm,short keyLength) Constructs a KeyPair instance for the specified algorithm and keylength;the encapsulated keys are uninitialized.

  • SiteGround uses key pairs for SSH authentication purposes, as opposed to plain username and password. More information on SSH keys is available here. You can generate an SSH key pair in Mac OS following these steps: Open up the Terminal by going to Applications - Utilities - Terminal.
  • As far as I understand, RSA keys are usually generated based on a (strong) random generator. Instead, I want to create them based on a password. Or rather on its hash, for example sha512(sha512(password+salt)+password+pepper) This needs to be done client side, in JavaScript.

The Java KeyPairGenerator class ( is used to generate asymmetric encryption / decryption key pairs. An asymmetric key pair consists of two keys. The first key is typically used to encrypt data. The second key which is used to decrypt data encrypted with the first key.

Public Key, Private Key Type Key Pairs

The most commonly known type of asymmetric key pair is the public key, private key type of key pair. The private key is used to encrypt data, and the public key can be used to decrypt the data again. Actually, you could also encrypt data using the public key and decrypt it using the private key.

The private key is normally kept secret, and the public key can be made publicly available. Thus, if Jack encrypts some data with his private key, everyone in possession of Jack's public key can decrypt it.

Creating a KeyPairGenerator Instance

To use the Java KeyPairGenerator you must first create a KeyPairGenerator instance. Creating a KeyPairGenerator instance is done by calling the method getInstance() method. Here is an example of creating a Java KeyPairGenerator instance:


The getInstance() method takes the name of the encryption algorithm to generate the key pair for. In this example we use the name RSA.

Generate Rsa Key Pair In Java Cards

Initializing the KeyPairGenerator

Depending on the algorithm the key pair is generated for, you may have to initialize the KeyPairGenerator instance. Initializing the KeyPairGenerator is done by calling its initialize() method. Here is an example of initializing a Java KeyPairGenerator instance:

This example initializes the KeyPairGenerator to generate keys of 2048 bits in size.

Generating a Key Pair

How To Generate Rsa Key

To generate a KeyPair with a KeyPairGenerator you call the generateKeyPair() method. Here is an example of generating a KeyPair with the KeyPairGenerator:

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