Package org.bouncycastle.crypto.agreement.srp

Class SRP6Util

java.lang.Object

org.bouncycastle.crypto.agreement.srp.SRP6Util

public class SRP6Util
extends Object

Constructor Summary

Constructors

Constructor	Description
SRP6Util()

Method Summary

Modifier and Type	Method	Description
static BigInteger	calculateK(Digest digest, BigInteger N, BigInteger g)
static BigInteger	calculateKey(Digest digest, BigInteger N, BigInteger S)	Computes the final Key according to the standard routine: Key = H(S)
static BigInteger	calculateM1(Digest digest, BigInteger N, BigInteger A, BigInteger B, BigInteger S)	Computes the client evidence message (M1) according to the standard routine: M1 = H( A | B | S )
static BigInteger	calculateM2(Digest digest, BigInteger N, BigInteger A, BigInteger M1, BigInteger S)	Computes the server evidence message (M2) according to the standard routine: M2 = H( A | M1 | S )
static BigInteger	calculateU(Digest digest, BigInteger N, BigInteger A, BigInteger B)
static BigInteger	calculateX(Digest digest, BigInteger N, byte[] salt, byte[] identity, byte[] password)
static BigInteger	generatePrivateValue(Digest digest, BigInteger N, BigInteger g, SecureRandom random)
static BigInteger	validatePublicValue(BigInteger N, BigInteger val)

Methods inherited from class java.lang.Object

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

Constructor Details

SRP6Util

public SRP6Util()

Method Details

calculateK

public static BigInteger calculateK(Digest digest,
 BigInteger N,
 BigInteger g)

calculateU

public static BigInteger calculateU(Digest digest,
 BigInteger N,
 BigInteger A,
 BigInteger B)

calculateX

public static BigInteger calculateX(Digest digest,
 BigInteger N,
 byte[] salt,
 byte[] identity,
 byte[] password)

generatePrivateValue

public static BigInteger generatePrivateValue(Digest digest,
 BigInteger N,
 BigInteger g,
 SecureRandom random)

validatePublicValue

public static BigInteger validatePublicValue(BigInteger N,
 BigInteger val)
                                      throws CryptoException

Throws:

CryptoException

calculateM1

public static BigInteger calculateM1(Digest digest,
 BigInteger N,
 BigInteger A,
 BigInteger B,
 BigInteger S)

Computes the client evidence message (M1) according to the standard routine: M1 = H( A | B | S )

Parameters:

digest - The Digest used as the hashing function H

N - Modulus used to get the pad length

A - The public client value

B - The public server value

S - The secret calculated by both sides

Returns:

M1 The calculated client evidence message

calculateM2

public static BigInteger calculateM2(Digest digest,
 BigInteger N,
 BigInteger A,
 BigInteger M1,
 BigInteger S)

Computes the server evidence message (M2) according to the standard routine: M2 = H( A | M1 | S )

Parameters:

digest - The Digest used as the hashing function H

N - Modulus used to get the pad length

A - The public client value

M1 - The client evidence message

S - The secret calculated by both sides

Returns:

M2 The calculated server evidence message

calculateKey

public static BigInteger calculateKey(Digest digest,
 BigInteger N,
 BigInteger S)

Computes the final Key according to the standard routine: Key = H(S)

Parameters:

digest - The Digest used as the hashing function H

N - Modulus used to get the pad length

S - The secret calculated by both sides

Returns:

the final Key value.