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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.operator;

import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;

public interface SecretKeySizeProvider
{
    int getKeySize(AlgorithmIdentifier algorithmIdentifier);

    /**
     * Return the key size implied by the OID, if one exists.
     *
     * @param algorithm the OID of the algorithm of interest.
     * @return -1 if there is no fixed key size associated with the OID, or more information is required.
     */
    int getKeySize(ASN1ObjectIdentifier algorithm);
}