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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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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);
}