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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.tls.crypto;

import java.math.BigInteger;

/**
 * Base interface for a generator for SRP-6 verifiers.
 */
public interface TlsSRP6VerifierGenerator
{
    /**
     * Creates a new SRP-6 verifier value.
     *
     * @param salt The salt to use, generally should be large and random
     * @param identity The user's identifying information (eg. username)
     * @param password The user's password
     * @return A new verifier for use in future SRP authentication
     */
    BigInteger generateVerifier(byte[] salt, byte[] identity, byte[] password);
}