org.spongycastle.crypto.agreement.srp

Class SRP6Util

java.lang.Object

org.spongycastle.crypto.agreement.srp.SRP6Util

public class SRP6Util
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
SRP6Util()

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Detail

SRP6Util

public SRP6Util()

Method Detail

calculateK

public static java.math.BigInteger calculateK(Digest digest,
                                              java.math.BigInteger N,
                                              java.math.BigInteger g)

calculateU

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

calculateX

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

generatePrivateValue

public static java.math.BigInteger generatePrivateValue(Digest digest,
                                                        java.math.BigInteger N,
                                                        java.math.BigInteger g,
                                                        java.security.SecureRandom random)

validatePublicValue

public static java.math.BigInteger validatePublicValue(java.math.BigInteger N,
                                                       java.math.BigInteger val)
                                                throws CryptoException

Throws:

CryptoException

calculateM1

public static java.math.BigInteger calculateM1(Digest digest,
                                               java.math.BigInteger N,
                                               java.math.BigInteger A,
                                               java.math.BigInteger B,
                                               java.math.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 java.math.BigInteger calculateM2(Digest digest,
                                               java.math.BigInteger N,
                                               java.math.BigInteger A,
                                               java.math.BigInteger M1,
                                               java.math.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 java.math.BigInteger calculateKey(Digest digest,
                                                java.math.BigInteger N,
                                                java.math.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.