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/**
* The MIT License
*
* Copyright (C) 2015 Asterios Raptis
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package io.github.astrapi69.crypt.data.key;
import java.lang.reflect.InvocationTargetException;
import java.security.AlgorithmParameterGenerator;
import java.security.InvalidParameterException;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.util.LinkedHashSet;
import java.util.Set;
import javax.crypto.KeyGenerator;
/**
* The class {@link KeySizeExtensions} provides methods to retrieve supported key sizes for various
* cryptographic algorithms using different cryptographic service types
*/
public class KeySizeExtensions
{
/**
* Generic method to determine supported key sizes for a cryptographic service
*
* @param
* the type of the generator
* @param algorithm
* the name of the cryptographic algorithm (e.g., "RSA", "AES")
* @param generatorClass
* the class type of the generator (e.g., KeyPairGenerator.class)
* @param initializer
* a lambda expression to initialize the generator with the specified key size
* @param minSize
* the minimum key size to test
* @param maxSize
* the maximum key size to test
* @param increment
* the increment step for the key size
* @return a set of supported key sizes for the specified algorithm
* @throws NoSuchMethodException
* if the specified method cannot be found
* @throws InvocationTargetException
* if the underlying method throws an exception
* @throws IllegalAccessException
* if the method is inaccessible
*/
@SuppressWarnings("unchecked")
public static Set getSupportedKeySizes(String algorithm, Class generatorClass,
KeySizeInitializer initializer, int minSize, int maxSize, int increment)
throws NoSuchMethodException, InvocationTargetException, IllegalAccessException
{
Set supportedKeySizes = new LinkedHashSet<>();
T generator = (T)generatorClass.getDeclaredMethod("getInstance", String.class).invoke(null,
algorithm);
for (int i = minSize; i <= maxSize; i += increment)
{
try
{
initializer.initialize(generator, i);
supportedKeySizes.add(i);
}
catch (InvalidParameterException e)
{
// Key size not supported
}
}
return supportedKeySizes;
}
/**
* Retrieves the set of supported key sizes for the specified cryptographic algorithm using a
* {@link KeyGenerator}
*
* This method initializes a {@link KeyGenerator} instance for the given algorithm and attempts
* to initialize it with key sizes from 112 bits to 8192 bits in increments of 64 bits. If the
* initialization succeeds, the key size is considered supported and is added to the set of
* supported key sizes. If the initialization fails with an {@link InvalidParameterException},
* the key size is considered unsupported and is not added to the set
*
* @param algorithm
* the name of the cryptographic algorithm (e.g., "AES", "DES")
* @return a set of supported key sizes for the specified algorithm
* @throws NoSuchMethodException
* if the specified method cannot be found
* @throws InvocationTargetException
* if the underlying method throws an exception
* @throws IllegalAccessException
* if the method is inaccessible
*/
public static Set getSupportedKeySizesForAlgorithmParameterGenerator(String algorithm)
throws NoSuchMethodException, InvocationTargetException, IllegalAccessException
{
return KeySizeExtensions.getSupportedKeySizes(algorithm, AlgorithmParameterGenerator.class,
(generator, keySize) -> ((AlgorithmParameterGenerator)generator).init(keySize), 1, 8192,
1);
}
/**
* Retrieves the set of supported key sizes for the specified cryptographic algorithm using a
* {@link KeyPairGenerator}
*
* This method initializes a {@link KeyPairGenerator} instance for the given algorithm and
* attempts to initialize it with key sizes from 512 bits to 8192 bits in increments of 64 bits.
* If the initialization succeeds, the key size is considered supported and is added to the set
* of supported key sizes. If the initialization fails with an
* {@link InvalidParameterException}, the key size is considered unsupported and is not added to
* the set
*
* @param algorithm
* the name of the cryptographic algorithm (e.g., "RSA", "DSA")
* @return a set of supported key sizes for the specified algorithm
* @throws NoSuchMethodException
* if the specified method cannot be found
* @throws InvocationTargetException
* if the underlying method throws an exception
* @throws IllegalAccessException
* if the method is inaccessible
*/
public static Set getSupportedKeySizesForKeyPairGenerator(String algorithm)
throws NoSuchMethodException, InvocationTargetException, IllegalAccessException
{
return KeySizeExtensions.getSupportedKeySizes(algorithm, KeyPairGenerator.class,
KeyPairGenerator::initialize, 512, 8192, 64);
}
/**
* Retrieves the set of supported key sizes for the specified cryptographic algorithm using a
* {@link KeyGenerator}
*
* This method initializes a {@link KeyGenerator} instance for the given algorithm and attempts
* to initialize it with key sizes from 112 bits to 8192 bits in increments of 64 bits. If the
* initialization succeeds, the key size is considered supported and is added to the set of
* supported key sizes. If the initialization fails with an {@link InvalidParameterException},
* the key size is considered unsupported and is not added to the set
*
* @param algorithm
* the name of the cryptographic algorithm (e.g., "AES", "DES")
* @return a set of supported key sizes for the specified algorithm
* @throws NoSuchAlgorithmException
* if no provider supports a {@link KeyGenerator} for the specified algorithm
*/
public static Set getSupportedKeySizesForKeyGenerator(String algorithm)
throws NoSuchAlgorithmException
{
Set supportedKeySizes = new LinkedHashSet<>();
KeyGenerator keyGenerator = KeyGenerator.getInstance(algorithm);
for (int i = 1; i <= 8192; i += 1)
{
try
{
keyGenerator.init(i);
keyGenerator.generateKey();
supportedKeySizes.add(i);
}
catch (InvalidParameterException e)
{
// Key size not supported
}
}
return supportedKeySizes;
}
}