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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.operator;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.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);
}