Module com.github.glusk.srp6_variables

Package com.github.glusk.srp6_variables

Class SRP6ServerSharedSecret

java.lang.Object

com.github.glusk.srp6_variables.AbstractSRP6IntegerVariable

com.github.glusk.srp6_variables.SRP6ServerSharedSecret

All Implemented Interfaces:

SRP6IntegerVariable

public final class SRP6ServerSharedSecret
extends AbstractSRP6IntegerVariable

SRP-6 Server Shared Secret (S).

This variable is computed as:

 S = (Av^u) ^ b
 

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
SRP6ServerSharedSecret(SRP6IntegerVariable prime, SRP6IntegerVariable clientPublicKey, SRP6IntegerVariable verifier, SRP6IntegerVariable scramblingParameter, SRP6IntegerVariable serverEphPrvtKey)	Constructs a new SRP-6 Server Shared Secret from prime, client public key, verifier, random scrambling parameter and server 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

SRP6ServerSharedSecret

public SRP6ServerSharedSecret(SRP6IntegerVariable prime,
                              SRP6IntegerVariable clientPublicKey,
                              SRP6IntegerVariable verifier,
                              SRP6IntegerVariable scramblingParameter,
                              SRP6IntegerVariable serverEphPrvtKey)

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

Parameters:

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

clientPublicKey - SRP-6 Integer Variable: client public key (A)

verifier - SRP-6 Integer Variable: verifier (v)

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

serverEphPrvtKey - SRP-6 Integer Variable: server ephemeral private key (b)

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 A == 0 (mod N)