com.browserup.bup.mitm.keys.RSAKeyGenerator Maven / Gradle / Ivy
/*
* Modifications Copyright (c) 2019 BrowserUp, Inc.
*/
package com.browserup.bup.mitm.keys;
import com.browserup.bup.mitm.exception.KeyGeneratorException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
/**
* A {@link KeyGenerator} that creates RSA key pairs.
*/
public class RSAKeyGenerator implements KeyGenerator {
private static final String RSA_KEY_GEN_ALGORITHM = "RSA";
/**
* Use a default RSA key size of 2048, since Chrome, Firefox, and possibly other browsers have begun to distrust
* certificates signed with 1024-bit RSA keys.
*/
private static final int DEFAULT_KEY_SIZE = 2048;
private final int keySize;
/**
* Create a {@link KeyGenerator} that will create a 2048-bit RSA key pair.
*/
public RSAKeyGenerator() {
this.keySize = DEFAULT_KEY_SIZE;
}
/**
* Create a {@link KeyGenerator} that will create an RSA key pair of the specified keySize.
* @param keySize keySize
*/
public RSAKeyGenerator(int keySize) {
this.keySize = keySize;
}
@Override
public KeyPair generate() {
// obtain an RSA key pair generator for the specified key size
KeyPairGenerator generator;
try {
generator = KeyPairGenerator.getInstance(RSA_KEY_GEN_ALGORITHM);
generator.initialize(keySize);
} catch (NoSuchAlgorithmException e) {
throw new KeyGeneratorException("Unable to generate " + keySize + "-bit RSA public/private key pair", e);
}
return generator.generateKeyPair();
}
@Override
public String toString() {
return "RSA (" + keySize + ")";
}
}