Code example for X509Certificate

Methods: getPublicKeygetTBSCertificate

0
 
    private KeyTransRecipientInfo computeRecipientInfo(X509Certificate x509certificate, byte[] abyte0)
        throws GeneralSecurityException, IOException 
    { 
        ASN1InputStream asn1inputstream =
            new ASN1InputStream(new ByteArrayInputStream(x509certificate.getTBSCertificate()));
        TBSCertificateStructure tbscertificatestructure =
            TBSCertificateStructure.getInstance(asn1inputstream.readObject());
        AlgorithmIdentifier algorithmidentifier = tbscertificatestructure.getSubjectPublicKeyInfo().getAlgorithm();
        IssuerAndSerialNumber issuerandserialnumber =
            new IssuerAndSerialNumber( 
                tbscertificatestructure.getIssuer(),
                tbscertificatestructure.getSerialNumber().getValue());
        Cipher cipher = Cipher.getInstance(algorithmidentifier.getAlgorithm().getId());
        try{ 
        cipher.init(1, x509certificate);
        }catch(InvalidKeyException e){
        	cipher.init(1,x509certificate.getPublicKey());
        } 
        DEROctetString deroctetstring = new DEROctetString(cipher.doFinal(abyte0));
        RecipientIdentifier recipId = new RecipientIdentifier(issuerandserialnumber);
        return new KeyTransRecipientInfo( recipId, algorithmidentifier, deroctetstring);
    } 
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