org.bouncycastle.cert.selector.MSOutlookKeyIdCalculator Maven / Gradle / Ivy

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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.cert.selector;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.SHA1Digest;

class MSOutlookKeyIdCalculator
{
    static byte[] calculateKeyId(SubjectPublicKeyInfo info)
    {
        Digest dig = new SHA1Digest();    // TODO: include definition of SHA-1 here
        byte[] hash = new byte[dig.getDigestSize()];
        byte[] spkiEnc = new byte[0];
        try
        {
            spkiEnc = info.getEncoded(ASN1Encoding.DER);
        }
        catch (IOException e)
        {
            return new byte[0];
        }

        // try the outlook 2010 calculation
        dig.update(spkiEnc, 0, spkiEnc.length);

        dig.doFinal(hash, 0);

        return hash;
    }
}