Module com.github.glusk.srp6_variables

Package com.github.glusk.srp6_variables

Class SRP6ClientSharedSecret

java.lang.Object

com.github.glusk.srp6_variables.AbstractSRP6IntegerVariable

com.github.glusk.srp6_variables.SRP6ClientSharedSecret

All Implemented Interfaces:

SRP6IntegerVariable

public final class SRP6ClientSharedSecret
extends AbstractSRP6IntegerVariable

SRP-6 Client Shared Secret (S).

This variable is computed as:

 S = (B - kg^x) ^ (a + ux)
 

where ^ is modular exponentiation modulo N.

RFC 5054 also calls this value "premaster secret".

Refer to the package docs for more info on notation used.

Constructor Summary

Constructors

Constructor	Description
SRP6ClientSharedSecret(SRP6IntegerVariable prime, SRP6IntegerVariable generator, SRP6IntegerVariable multiplier, SRP6IntegerVariable serverPublicKey, SRP6IntegerVariable privateKey, SRP6IntegerVariable scramblingParameter, SRP6IntegerVariable clientEphPrvtKey)	Constructs a new SRP-6 Server Shared Secret from prime, generator, multiplier, server public key, private key, random scrambling parameter and client ephemeral private key.

Method Summary

Modifier and Type	Method	Description
Bytes	bytes(ByteOrder preferredOrder)	Returns this SRP-6 Integer Variable as a byte sequence in the preferred byte order.

Methods inherited from class com.github.glusk.srp6_variables.AbstractSRP6IntegerVariable

equals, hashCode

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.github.glusk.srp6_variables.SRP6IntegerVariable

asNonNegativeBigInteger, bytes

Constructor Detail

SRP6ClientSharedSecret

public SRP6ClientSharedSecret(SRP6IntegerVariable prime,
                              SRP6IntegerVariable generator,
                              SRP6IntegerVariable multiplier,
                              SRP6IntegerVariable serverPublicKey,
                              SRP6IntegerVariable privateKey,
                              SRP6IntegerVariable scramblingParameter,
                              SRP6IntegerVariable clientEphPrvtKey)

Constructs a new SRP-6 Server Shared Secret from prime, generator, multiplier, server public key, private key, random scrambling parameter and client ephemeral private key.

Parameters:

prime - SRP-6 Integer Variable: prime (N)

generator - SRP-6 Integer Variable: generator (g)

multiplier - SRP-6 Integer Variable: multiplier (k)

serverPublicKey - SRP-6 Integer Variable: server public key (B)

privateKey - SRP-6 Integer Variable: private key (x)

scramblingParameter - SRP-6 Integer Variable: random scrambling parameter (u)

clientEphPrvtKey - SRP-6 Integer Variable: client ephemeral private key (a)

Method Detail

bytes

public Bytes bytes(ByteOrder preferredOrder)
            throws IllegalStateException

Returns this SRP-6 Integer Variable as a byte sequence in the preferred byte order.

The representation returned must be minimal. That is, all leading (or trailing, depending on the preferredOrder) zero bytes have to be trimmed.

Number zero is hence defined as an empty byte sequence.

Parameters:

preferredOrder - the preferred byte order of the byte sequence that represents this SRP-6 Integer Variable

Returns:

the byte sequence that represents this SRP-6 Integer Variable in the preferred byte order

Throws:

IllegalStateException - if B == 0 (mod N) or u == 0