Java Generate Rsa 2048 Key

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  1. Java Cipher Rsa
  2. Java Ras
Rsa-2048

This chapter demonstrates how to generate an RSA based OpenPGP key pair with OpenPGP Library for Java.

When we create an OpenPGP key pair, a few parameters must be passed. These include:

  • 2020-2-5  Using OpenSSL on a reasonably modern PC I can generate a 2048 bit key in 1 second and a 4096 bit key in generate big keys than smaller ones!
  • Dummy tools to generate RSA 2048 key pair, to encrypt strings with pub key and also decrypt string with private keys - RSAKeyGenMain.java.
  • Online RSA Key Generator. 2048 bit; 4096 bit Generate New Keys Async. RSA Encryption Test. Text to encrypt.
  • Before you can create your CSR, you need to create your Java keystore. Your Java keystore contains your private key. Run the following command to create your 2048 bit Java keystore: keytool -genkey -alias myalias -keyalg RSA –keysize 2048 -keystore c:yoursite.keystore 2. Note the alias you use here to create the keystore.
  • Encryption key size in bytes (recommended between 1024 and 3072)
  • User ID
  • key algorithm (RSA or ELGAMAL)
  • private key password
  • list of preferred compression algorithms
  • list of preferred signature hash algorithms
  • list of preferred symmetric encryption algorithms
  • key expiration date (optional)

One note regarding the naming convention for the User ID parameter. The original PGP(r) software is delimiting the email in the User ID with < and > like : “Richard C. <richard.c@site.com>”

Java Cipher Rsa

An overloaded method exists that accepts key expiration date as a last parameter.

Table of Contents

1. Key generation with a KeyStore

2. Key generation directly

3. Exception handling

1. Key generation example

After the key pair is generated usually we will export the public key and send it to our partners.

Below is a screenshot of the generated key properties when we open it with PGP (r) 10:


2. Key generation directly

We can avoid the use of a KeyStore class and generate a key pair in the memory in a PGPKeyPair object. In that case we also have to export it afterwards.

3. Exception Handling

The key pair generation methods simply throw com.didisoft.pgp.PGPException in case the key generation fails.

Summary

Java Ras

This chapter demonstrated how to generate an RSA OpenPGP key pair with DidiSoft OpenPGP Library for Java.