Package rs.baselib.crypto

Class KeyGen

java.lang.Object

rs.baselib.crypto.KeyGen

public class KeyGen
extends Object

The class for generating key pairs.

Author:

ralph

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DEFAULT_KEY_ALGORITHM	Default key generating algorithm
static final String	ECS_KEY_ALGORITHM
static final String	RSA_KEY_ALGORITHM

Constructor Summary

Constructors

Constructor	Description
KeyGen()

Method Summary

Modifier and Type	Method	Description
static KeyPair	generateKeyPair()	Generate a key pair using default settings (EC, 256 bit).
static KeyPair	generateKeyPair(String algorithm)	Generate a key pair using default settings for the given algorithm.
static KeyPair	generateKeyPair(String algorithm, int keySize)	Generate a key pair using default settings for the given algorithm.
static KeyPair	generateKeyPair(KeyPairGenerator generator)	Generates a key pair using the configured generator.
static KeyPair	generateKeyPairBySeed(byte[] seed)	Generates a public/private DSA key pair.
static KeyPair	generateKeyPairBySeed(String seed)	Generates a public/private key pair.
static KeyPair	generateKeyPairBySeed(String seed, Charset charset)	Generates a public/private key pair.
static SecretKey	generateSecretKey(int iterationCount, String passPhrase, byte[] salt)	Generates a secret key (PBE) based on the given parameters.
static int	getPreferredKeySize(String algorithm)	Returns preferred key size for the given algorithm.
static void	log(KeyPair keyPair)	Log a key pair using the SLF4J Logger.
static void	main(String[] args)
static void	print(KeyPair keyPair)	Log a key pair using the System.out stream.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

RSA_KEY_ALGORITHM

public static final String RSA_KEY_ALGORITHM

See Also:

• Constant Field Values

ECS_KEY_ALGORITHM

public static final String ECS_KEY_ALGORITHM

See Also:

• Constant Field Values

DEFAULT_KEY_ALGORITHM

public static final String DEFAULT_KEY_ALGORITHM

Default key generating algorithm

See Also:

• Constant Field Values

Constructor Details

KeyGen

public KeyGen()

Method Details

generateSecretKey

public static SecretKey generateSecretKey(int iterationCount,
 String passPhrase,
 byte[] salt)
                                   throws NoSuchAlgorithmException,
InvalidKeySpecException

Generates a secret key (PBE) based on the given parameters.

Parameters:

iterationCount - the cumber of iterations (if less than 1 then EncryptionUtils.DEFAULT_ITERATIONS will be used)

passPhrase - the passphrase (required)

salt - the slat (can be null)

Returns:

a secret key based on parameters

Throws:

NoSuchAlgorithmException - when the algorithm does not exist

InvalidKeySpecException - when the key spec is invalid

generateKeyPairBySeed

public static KeyPair generateKeyPairBySeed(String seed)
                                     throws NoSuchProviderException,
NoSuchAlgorithmException

Generates a public/private key pair.

Parameters:

seed - seed to be used.

Returns:

key pair

Throws:

NoSuchProviderException - when the algorithm provider does not exist

NoSuchAlgorithmException - when the algorithm does not exist

generateKeyPairBySeed

public static KeyPair generateKeyPairBySeed(String seed,
 Charset charset)
                                     throws NoSuchProviderException,
NoSuchAlgorithmException

Generates a public/private key pair.

Parameters:

seed - seed to be used.

charset - the charset to be used for string encoding (null for default charset)

Returns:

key pair

Throws:

NoSuchProviderException - when the algorithm provider does not exist

NoSuchAlgorithmException - when the algorithm does not exist

generateKeyPairBySeed

public static KeyPair generateKeyPairBySeed(byte[] seed)
                                     throws NoSuchProviderException,
NoSuchAlgorithmException

Generates a public/private DSA key pair.

Parameters:

seed - seed to be used.

Returns:

key pair

Throws:

NoSuchProviderException - when the algorithm provider does not exist

NoSuchAlgorithmException - when the algorithm does not exist

log

public static void log(KeyPair keyPair)

Log a key pair using the SLF4J Logger.

Parameters:

keyPair - key pair to be logged

print

public static void print(KeyPair keyPair)

Log a key pair using the System.out stream.

Parameters:

keyPair - key pair to be logged

generateKeyPair

public static KeyPair generateKeyPair()
                               throws NoSuchAlgorithmException

Generate a key pair using default settings (EC, 256 bit).

Returns:

a new key pair

Throws:

NoSuchAlgorithmException - when the default algorithm does not exist

generateKeyPair

public static KeyPair generateKeyPair(String algorithm)
                               throws NoSuchAlgorithmException

Generate a key pair using default settings for the given algorithm.

Parameters:

algorithm - key generation algorithm

Returns:

a new key pair

Throws:

NoSuchAlgorithmException - when the default algorithm does not exist

See Also:

• getPreferredKeySize(String)

generateKeyPair

public static KeyPair generateKeyPair(String algorithm,
 int keySize)
                               throws NoSuchAlgorithmException

Generate a key pair using default settings for the given algorithm.

Parameters:

algorithm - key generation algorithm

Returns:

a new key pair

Throws:

NoSuchAlgorithmException - when the default algorithm does not exist

See Also:

• getPreferredKeySize(String)

getPreferredKeySize

public static int getPreferredKeySize(String algorithm)

Returns preferred key size for the given algorithm.

The method knows about RSA, DSA and EC. All others will receive a 1024 bit key size

Parameters:

algorithm - the algorithm

Returns:

the preferred key size

generateKeyPair

public static KeyPair generateKeyPair(KeyPairGenerator generator)

Generates a key pair using the configured generator.

Parameters:

generator - the key pair generator

Returns:

a new key pair

main

public static void main(String[] args)