/*

 * 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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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 */

package sun.security.pkcs;

import java.io.*;

import sun.security.util.*;

/**

 * A ContentInfo type, as defined in PKCS#7.

 *

 * @author Benjamin Renaud

 */

public class ContentInfo {

    // pkcs7 pre-defined content types

    private static int[]  pkcs7 = {1, 2, 840, 113549, 1, 7};

    private static int[]   data = {1, 2, 840, 113549, 1, 7, 1};

    private static int[]  sdata = {1, 2, 840, 113549, 1, 7, 2};

    private static int[]  edata = {1, 2, 840, 113549, 1, 7, 3};

    private static int[] sedata = {1, 2, 840, 113549, 1, 7, 4};

    private static int[]  ddata = {1, 2, 840, 113549, 1, 7, 5};

    private static int[] crdata = {1, 2, 840, 113549, 1, 7, 6};

    private static int[] nsdata = {2, 16, 840, 1, 113730, 2, 5};

    // timestamp token (id-ct-TSTInfo) from RFC 3161

    private static int[] tstInfo = {1, 2, 840, 113549, 1, 9, 16, 1, 4};

    // this is for backwards-compatibility with JDK 1.1.x

    private static final int[] OLD_SDATA = {1, 2, 840, 1113549, 1, 7, 2};

    private static final int[] OLD_DATA = {1, 2, 840, 1113549, 1, 7, 1};

    public static ObjectIdentifier PKCS7_OID;

    public static ObjectIdentifier DATA_OID;

    public static ObjectIdentifier SIGNED_DATA_OID;

    public static ObjectIdentifier ENVELOPED_DATA_OID;

    public static ObjectIdentifier SIGNED_AND_ENVELOPED_DATA_OID;

    public static ObjectIdentifier DIGESTED_DATA_OID;

    public static ObjectIdentifier ENCRYPTED_DATA_OID;

    public static ObjectIdentifier OLD_SIGNED_DATA_OID;

    public static ObjectIdentifier OLD_DATA_OID;

    public static ObjectIdentifier NETSCAPE_CERT_SEQUENCE_OID;

    public static ObjectIdentifier TIMESTAMP_TOKEN_INFO_OID;

    static {

        PKCS7_OID =  ObjectIdentifier.newInternal(pkcs7);

        DATA_OID = ObjectIdentifier.newInternal(data);

        SIGNED_DATA_OID = ObjectIdentifier.newInternal(sdata);

        ENVELOPED_DATA_OID = ObjectIdentifier.newInternal(edata);

        SIGNED_AND_ENVELOPED_DATA_OID = ObjectIdentifier.newInternal(sedata);

        DIGESTED_DATA_OID = ObjectIdentifier.newInternal(ddata);

        ENCRYPTED_DATA_OID = ObjectIdentifier.newInternal(crdata);

        OLD_SIGNED_DATA_OID = ObjectIdentifier.newInternal(OLD_SDATA);

        OLD_DATA_OID = ObjectIdentifier.newInternal(OLD_DATA);

        /**

         * The ASN.1 systax for the Netscape Certificate Sequence

         * data type is defined

         * <a href=http://wp.netscape.com/eng/security/comm4-cert-download.html>

         * here.</a>

         */

        NETSCAPE_CERT_SEQUENCE_OID = ObjectIdentifier.newInternal(nsdata);

        TIMESTAMP_TOKEN_INFO_OID = ObjectIdentifier.newInternal(tstInfo);

    }

    ObjectIdentifier contentType;

    DerValue content; // OPTIONAL

    public ContentInfo(ObjectIdentifier contentType, DerValue content) {

        this.contentType = contentType;

        this.content = content;

    }

    /**

     * Make a contentInfo of type data.

     */

    public ContentInfo(byte[] bytes) {

        DerValue octetString = new DerValue(DerValue.tag_OctetString, bytes);

        this.contentType = DATA_OID;

        this.content = octetString;

    }

    /**

     * Parses a PKCS#7 content info.

     */

    public ContentInfo(DerInputStream derin)

        throws IOException, ParsingException

    {

        this(derin, false);

    }

    /**

     * Parses a PKCS#7 content info.

     *

     * <p>This constructor is used only for backwards compatibility with

     * PKCS#7 blocks that were generated using JDK1.1.x.

     *

     * @param derin the ASN.1 encoding of the content info.

     * @param oldStyle flag indicating whether or not the given content info

     * is encoded according to JDK1.1.x.

     */

    public ContentInfo(DerInputStream derin, boolean oldStyle)

        throws IOException, ParsingException

    {

        DerInputStream disType;

        DerInputStream disTaggedContent;

        DerValue type;

        DerValue taggedContent;

        DerValue[] typeAndContent;

        DerValue[] contents;

        typeAndContent = derin.getSequence(2);

        // Parse the content type

        type = typeAndContent[0];

        disType = new DerInputStream(type.toByteArray());

        contentType = disType.getOID();

        if (oldStyle) {

            // JDK1.1.x-style encoding

            content = typeAndContent[1];

        } else {

            // This is the correct, standards-compliant encoding.

            // Parse the content (OPTIONAL field).

            // Skip the [0] EXPLICIT tag by pretending that the content is the

            // one and only element in an implicitly tagged set

            if (typeAndContent.length > 1) { // content is OPTIONAL

                taggedContent = typeAndContent[1];

                disTaggedContent

                    = new DerInputStream(taggedContent.toByteArray());

                contents = disTaggedContent.getSet(1, true);

                content = contents[0];

            }

        }

    }

    public DerValue getContent() {

        return content;

    }

    public ObjectIdentifier getContentType() {

        return contentType;

    }

    public byte[] getData() throws IOException {

            if (content == null)

                return null;

            else

                return content.getOctetString();

        }

        throw new IOException("content type is not DATA: " + contentType);

    }

    public void encode(DerOutputStream out) throws IOException {

        DerOutputStream contentDerCode;

        DerOutputStream seq;

        seq = new DerOutputStream();

        seq.putOID(contentType);

        // content is optional, it could be external

        if (content != null) {

            DerValue taggedContent = null;

            contentDerCode = new DerOutputStream();

            content.encode(contentDerCode);

            // Add the [0] EXPLICIT tag in front of the content encoding

            taggedContent = new DerValue((byte)0xA0,

                                         contentDerCode.toByteArray());

            seq.putDerValue(taggedContent);

        }

        out.write(DerValue.tag_Sequence, seq);

    }

    /**

     * Returns a byte array representation of the data held in

     * the content field.

     */

    public byte[] getContentBytes() throws IOException {

        if (content == null)

            return null;

        DerInputStream dis = new DerInputStream(content.toByteArray());

        return dis.getOctetString();

    }

    public String toString() {

        String out = "";

        out += "Content Info Sequence\n\tContent type: " + contentType + "\n";

        out += "\tContent: " + content;

        return out;

    }

}