org.bouncycastle.cert.crmf.PKMACValueVerifier Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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package org.bouncycastle.cert.crmf;

import java.io.IOException;
import java.io.OutputStream;

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.cmp.PBMParameter;
import org.bouncycastle.asn1.crmf.PKMACValue;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.operator.MacCalculator;
import org.bouncycastle.util.Arrays;

class PKMACValueVerifier
{
    private final PKMACBuilder builder;

    public PKMACValueVerifier(PKMACBuilder builder)
    {
        this.builder = builder;
    }

    public boolean isValid(PKMACValue value, char[] password, SubjectPublicKeyInfo keyInfo)
        throws CRMFException
    {
        builder.setParameters(PBMParameter.getInstance(value.getAlgId().getParameters()));
        MacCalculator calculator = builder.build(password);

        OutputStream macOut = calculator.getOutputStream();

        try
        {
            macOut.write(keyInfo.getEncoded(ASN1Encoding.DER));

            macOut.close();
        }
        catch (IOException e)
        {
            throw new CRMFException("exception encoding mac input: " + e.getMessage(), e);
        }

        return Arrays.constantTimeAreEqual(calculator.getMac(), value.getValue().getBytes());
    }
}