/*

 * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 * questions.

 */

/*

 * @test

 * @bug 4371801

 * @summary check that generateCertificates() returns an empty

 *      Collection when the input stream contains an encoded

 *      PKCS #7 SignedData object with no certificates.

 */

import java.io.ByteArrayInputStream;

import java.security.cert.CertificateFactory;

import java.util.Collection;

public class GenerateCertificatesEmptyCollection {

    public static void main(String[] args) throws Exception {

        /*

         * create an empty SignedData content type in ASN.1

         * as defined in PKCS#7

         */

        byte[] b = { 0x30, 0x23,

                     /* contentInfo ::= signedData */

                     0x06, 0x09, 0x2A, (byte)0x86, 0x48,

                     (byte)0x86, (byte)0xF7, 0x0D,

                     0x01, 0x07, 0x02,

                     0x00, 0x16,

                     0x30, 0x14,                /* SignedData */

                     0x02, 0x01, 0x01,          /* version */

                     0x31, 0x00,                /* digestAlgorithms */

                     0x30, 0x0B,                /* contentInfo ::= data */

                     0x06, 0x09, 0x2A, (byte)0x86, 0x48,

                     (byte)0x86, (byte)0xF7, 0x0D,

                     0x01, 0x07, 0x01,

                     /* certificates are absent */

                     0x31, 0x00                 /* signerInfos */

                   };

        CertificateFactory cf = CertificateFactory.getInstance( "X509", "SUN");

        Collection c = cf.generateCertificates( new ByteArrayInputStream(b));

        if (!c.isEmpty())

            throw new Exception("CertificateFactory.generateCertificates() "

                + "did not return an empty Collection");

    }

}