Module seppiko.commons.utils

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

Class ParameterSpacUtil

java.lang.Object

org.seppiko.commons.utils.crypto.spec.ParameterSpacUtil

public class ParameterSpacUtil
extends Object

Parameter Specification implement util

Author:

Leonard Woo

Method Summary

Modifier and Type	Method	Description
static DHParameterSpec	getDH(BigInteger p, BigInteger g)	DHParameterSpec object
static DHParameterSpec	getDH(BigInteger p, BigInteger g, int l)	DHParameterSpec object
static ECParameterSpec	getEC(ECField field, BigInteger fristCoefficient, BigInteger secondfficient, BigInteger affineX, BigInteger affineY, BigInteger generator, int cofactor)
static GCMParameterSpec	getGCM(int tLen, byte[] src)	GCMParameterSpec object
static GCMParameterSpec	getGCM(int tLen, byte[] src, int off, int len)	GCMParameterSpec object
static IvParameterSpec	getIV(byte[] iv)	IvParameterSpec object
static IvParameterSpec	getIV(byte[] iv, int off, int len)	IvParameterSpec object
static PBEParameterSpec	getPBE(byte[] salt, int iterationCount)	PBEParameterSpec object
static PBEParameterSpec	getPBE(byte[] salt, int iterationCount, AlgorithmParameterSpec paramSpec)	PBEParameterSpec object

Methods inherited from class java.lang.Object

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

Method Details

getGCM

public static GCMParameterSpec getGCM(int tLen,
 byte[] src)
                               throws NullPointerException,
IllegalArgumentException

GCMParameterSpec object

Parameters:

tLen - GCM authentication tag length

src - the IV source buffer

Returns:

GCMParameterSpec object

Throws:

NullPointerException - src is null

IllegalArgumentException - if tLen is negative, src is null, len or offset is negative, or the sum of offset and len is greater than the length of the src byte array.

See Also:

• GCMParameterSpec

getGCM

public static GCMParameterSpec getGCM(int tLen,
 byte[] src,
 int off,
 int len)
                               throws IllegalArgumentException

GCMParameterSpec object

Parameters:

tLen - GCM authentication tag length

src - the IV source buffer

off - the offset in src where the IV starts

len - the number of IV bytes

Returns:

GCMParameterSpec object

Throws:

IllegalArgumentException - if tLen is negative, src is null, len or offset is negative, or the sum of offset and len is greater than the length of the src byte array.

See Also:

• GCMParameterSpec

getIV

public static IvParameterSpec getIV(byte[] iv)
                             throws NullPointerException

IvParameterSpec object

Parameters:

iv - the buffer with the IV

Returns:

IvParameterSpec object

Throws:

NullPointerException - if iv is null

IllegalArgumentException - if iv is null or (iv.length - offset < len)

ArrayIndexOutOfBoundsException - is thrown if offset or len index bytes outside the iv.

See Also:

• IvParameterSpec

getIV

public static IvParameterSpec getIV(byte[] iv,
 int off,
 int len)

IvParameterSpec object

Parameters:

iv - the buffer with the IV

off - the offset in iv where the IV starts

len - the number of IV bytes

Returns:

IvParameterSpec object

Throws:

IllegalArgumentException - if iv is null or (iv.length - offset < len)

ArrayIndexOutOfBoundsException - is thrown if offset or len index bytes outside the iv.

See Also:

• IvParameterSpec

getPBE

public static PBEParameterSpec getPBE(byte[] salt,
 int iterationCount)
                               throws NullPointerException

PBEParameterSpec object

Parameters:

salt - the salt. The contents of salt are copied to protect against subsequent modification.

iterationCount - the iteration count.

Returns:

PBEParameterSpec object

Throws:

NullPointerException - if salt is null

See Also:

• PBEParameterSpec

getPBE

public static PBEParameterSpec getPBE(byte[] salt,
 int iterationCount,
 AlgorithmParameterSpec paramSpec)
                               throws NullPointerException

PBEParameterSpec object

Parameters:

salt - the salt. The contents of salt are copied to protect against subsequent modification.

iterationCount - the iteration count.

paramSpec - the cipher algorithm parameter specification

Returns:

PBEParameterSpec object

Throws:

NullPointerException - if salt is null

See Also:

• PBEParameterSpec

getDH

public static DHParameterSpec getDH(BigInteger p,
 BigInteger g)

DHParameterSpec object

Parameters:

p - the prime modulus

g - the base generator

Returns:

DHParameterSpec object

See Also:

• DHParameterSpec

getDH

public static DHParameterSpec getDH(BigInteger p,
 BigInteger g,
 int l)

DHParameterSpec object

Parameters:

p - the prime modulus

g - the base generator

l - the size in bits of the random exponent (private value)

Returns:

DHParameterSpec object

See Also:

• DHParameterSpec

getEC

public static ECParameterSpec getEC(ECField field,
 BigInteger fristCoefficient,
 BigInteger secondfficient,
 BigInteger affineX,
 BigInteger affineY,
 BigInteger generator,
 int cofactor)
                             throws NullPointerException,
IllegalArgumentException

Parameters:

field - the finite field that this elliptic curve is over.

fristCoefficient - the first coefficient of this elliptic curve.

secondfficient - the second coefficient of this elliptic curve.

affineX - the affine x-coordinate.

affineY - the affine y-coordinate.

generator - the order of the generator.

cofactor - the cofactor.

Returns:

ECParameterSpec object

Throws:

NullPointerException - if same parameter is null

IllegalArgumentException - if generator or cofactor is not positive or affineX or affineY is not null and not in field.