Module seppiko.commons.utils

Package org.seppiko.commons.utils.crypto.spec

Class KeySpecUtil

java.lang.Object

org.seppiko.commons.utils.crypto.spec.KeySpecUtil

public class KeySpecUtil
extends Object

Key Specification implement utility

Author:

Leonard Woo

Method Summary

Modifier and Type	Method	Description
static PrivateKey	genPrivateKey(KeyFactory keyFactory, PKCS8EncodedKeySpec keySpec)	Convert PKC8 to private key
static PublicKey	genPublicKey(KeyFactory keyFactory, X509EncodedKeySpec keySpec)	Convert X509 to public key
static PBEKeySpec	getPBE(char[] password)	PBEKeySpec object
static PBEKeySpec	getPBE(char[] password, byte[] salt, int iterationCount, int keyLength)	PBEKeySpec object
static PKCS8EncodedKeySpec	getPKCS8(byte[] key)	PKCS8EncodedKeySpec object
static PKCS8EncodedKeySpec	getPKCS8(byte[] key, String algorithm)	PKCS8EncodedKeySpec object
static SecretKeySpec	getSecret(byte[] key, int off, int len, String algorithm)	SecretKeySpec object
static SecretKeySpec	getSecret(byte[] key, String algorithm)	SecretKeySpec object
static X509EncodedKeySpec	getX509(byte[] key)	X509EncodedKeySpec object
static X509EncodedKeySpec	getX509(byte[] key, String algorithm)	X509EncodedKeySpec object
static XECPublicKeySpec	getXECPub(AlgorithmParameterSpec paramSpec, BigInteger u)	Construct a public key spec using the supplied parameters and u coordinate.

Methods inherited from class java.lang.Object

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

Method Details

getSecret

public static SecretKeySpec getSecret(byte[] key,
 String algorithm)
                               throws NullPointerException,
IllegalArgumentException

SecretKeySpec object

Parameters:

key - the key material of the secret key

algorithm - the name of the secret-key algorithm to be associated with the given key material

Returns:

SecretKeySpec object

Throws:

NullPointerException - if key is null.

IllegalArgumentException - if key is empty, or too short, i.e. key.length-offset<len.

See Also:

• SecretKeyFactory Algorithms
• SecretKeySpec

getSecret

public static SecretKeySpec getSecret(byte[] key,
 int off,
 int len,
 String algorithm)
                               throws NullPointerException,
IllegalArgumentException

SecretKeySpec object

Parameters:

key - the key material of the secret key

off - the offset in key where the key material starts

len - the length of the key material

algorithm - the name of the secret-key algorithm to be associated with the given key material

Returns:

SecretKeySpec object

Throws:

NullPointerException - if key is null or algorithm is null or empty.

IllegalArgumentException - if key is empty, or too short, i.e. key.length-offset<len.

See Also:

• SecretKeyFactory Algorithms
• SecretKeySpec

getPBE

public static PBEKeySpec getPBE(char[] password)

PBEKeySpec object

Parameters:

password - the password

Returns:

PBEKeySpec object

See Also:

• PBEKeySpec

getPBE

public static PBEKeySpec getPBE(char[] password,
 byte[] salt,
 int iterationCount,
 int keyLength)
                         throws NullPointerException,
IllegalArgumentException

PBEKeySpec object

Parameters:

password - the password

salt - the salt

iterationCount - the iteration count

keyLength - the to-be-derived key length

Returns:

PBEKeySpec object

Throws:

NullPointerException - if salt is null.

IllegalArgumentException - if salt is empty, i.e. 0-length, iterationCount or keyLength is not positive.

See Also:

• PBEKeySpec

getPKCS8

public static PKCS8EncodedKeySpec getPKCS8(byte[] key)
                                    throws NullPointerException

PKCS8EncodedKeySpec object

Parameters:

key - the key, which is assumed to be encoded according to the PKCS #8 standard. The contents of the array are copied to protect against subsequent modification.

Returns:

PKCS8EncodedKeySpec object

Throws:

NullPointerException - if key is null.

See Also:

• PKCS8EncodedKeySpec

getPKCS8

public static PKCS8EncodedKeySpec getPKCS8(byte[] key,
 String algorithm)
                                    throws NullPointerException,
IllegalArgumentException

PKCS8EncodedKeySpec object

Parameters:

key - the key, which is assumed to be encoded according to the PKCS #8 standard. The contents of the array are copied to protect against subsequent modification.

algorithm - the algorithm name of the encoded private key.

Returns:

PKCS8EncodedKeySpec object

Throws:

NullPointerException - if key is null

IllegalArgumentException - if algorithm is the empty string

See Also:

• PKCS8EncodedKeySpec

getX509

public static X509EncodedKeySpec getX509(byte[] key)
                                  throws NullPointerException

X509EncodedKeySpec object

Parameters:

key - the key, which is assumed to be encoded according to the X.509 standard. The contents of the array are copied to protect against subsequent modification.

Returns:

X509EncodedKeySpec object

Throws:

NullPointerException - if key is null

See Also:

• X509EncodedKeySpec

getX509

public static X509EncodedKeySpec getX509(byte[] key,
 String algorithm)
                                  throws NullPointerException,
IllegalArgumentException

X509EncodedKeySpec object

Parameters:

key - the key, which is assumed to be encoded according to the X.509 standard. The contents of the array are copied to protect against subsequent modification.

algorithm - the algorithm name of the encoded public key.

Returns:

X509EncodedKeySpec object

Throws:

NullPointerException - if key is null

IllegalArgumentException - if algorithm is the empty string

See Also:

• X509EncodedKeySpec

genPublicKey

public static PublicKey genPublicKey(KeyFactory keyFactory,
 X509EncodedKeySpec keySpec)
                              throws InvalidKeySpecException

Convert X509 to public key

Parameters:

keyFactory - KeyFactory object

keySpec - X509 object

Returns:

public key object

Throws:

InvalidKeySpecException - if the given key specification is inappropriate for this key factory to produce a public key.

genPrivateKey

public static PrivateKey genPrivateKey(KeyFactory keyFactory,
 PKCS8EncodedKeySpec keySpec)
                                throws InvalidKeySpecException

Convert PKC8 to private key

Parameters:

keyFactory - KeyFactory object

keySpec - PKC8 object

Returns:

private key object

Throws:

InvalidKeySpecException - if the given key specification is inappropriate for this key factory to produce a public key.

getXECPub

public static XECPublicKeySpec getXECPub(AlgorithmParameterSpec paramSpec,
 BigInteger u)

Construct a public key spec using the supplied parameters and u coordinate.

Parameters:

paramSpec - the algorithm parameters

u - the u-coordinate of the point

Returns:

XECPublicKeySpec object