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473 lines
17 KiB
Java
473 lines
17 KiB
Java
/*
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* Copyright 1996-2009 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.security.pkcs;
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import java.io.OutputStream;
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import java.io.IOException;
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import java.math.BigInteger;
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import java.security.cert.X509Certificate;
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import java.security.*;
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import java.util.ArrayList;
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import sun.security.util.*;
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import sun.security.x509.AlgorithmId;
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import sun.security.x509.X500Name;
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import sun.security.x509.KeyUsageExtension;
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import sun.security.x509.PKIXExtensions;
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import sun.misc.HexDumpEncoder;
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/**
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* A SignerInfo, as defined in PKCS#7's signedData type.
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*
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* @author Benjamin Renaud
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*/
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public class SignerInfo implements DerEncoder {
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BigInteger version;
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X500Name issuerName;
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BigInteger certificateSerialNumber;
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AlgorithmId digestAlgorithmId;
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AlgorithmId digestEncryptionAlgorithmId;
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byte[] encryptedDigest;
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PKCS9Attributes authenticatedAttributes;
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PKCS9Attributes unauthenticatedAttributes;
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public SignerInfo(X500Name issuerName,
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BigInteger serial,
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AlgorithmId digestAlgorithmId,
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AlgorithmId digestEncryptionAlgorithmId,
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byte[] encryptedDigest) {
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this.version = BigInteger.ONE;
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this.issuerName = issuerName;
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this.certificateSerialNumber = serial;
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this.digestAlgorithmId = digestAlgorithmId;
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this.digestEncryptionAlgorithmId = digestEncryptionAlgorithmId;
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this.encryptedDigest = encryptedDigest;
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}
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public SignerInfo(X500Name issuerName,
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BigInteger serial,
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AlgorithmId digestAlgorithmId,
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PKCS9Attributes authenticatedAttributes,
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AlgorithmId digestEncryptionAlgorithmId,
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byte[] encryptedDigest,
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PKCS9Attributes unauthenticatedAttributes) {
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this.version = BigInteger.ONE;
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this.issuerName = issuerName;
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this.certificateSerialNumber = serial;
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this.digestAlgorithmId = digestAlgorithmId;
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this.authenticatedAttributes = authenticatedAttributes;
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this.digestEncryptionAlgorithmId = digestEncryptionAlgorithmId;
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this.encryptedDigest = encryptedDigest;
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this.unauthenticatedAttributes = unauthenticatedAttributes;
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}
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/**
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* Parses a PKCS#7 signer info.
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*/
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public SignerInfo(DerInputStream derin)
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throws IOException, ParsingException
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{
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this(derin, false);
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}
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/**
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* Parses a PKCS#7 signer info.
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*
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* <p>This constructor is used only for backwards compatibility with
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* PKCS#7 blocks that were generated using JDK1.1.x.
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*
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* @param derin the ASN.1 encoding of the signer info.
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* @param oldStyle flag indicating whether or not the given signer info
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* is encoded according to JDK1.1.x.
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*/
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public SignerInfo(DerInputStream derin, boolean oldStyle)
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throws IOException, ParsingException
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{
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// version
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version = derin.getBigInteger();
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// issuerAndSerialNumber
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DerValue[] issuerAndSerialNumber = derin.getSequence(2);
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byte[] issuerBytes = issuerAndSerialNumber[0].toByteArray();
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issuerName = new X500Name(new DerValue(DerValue.tag_Sequence,
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issuerBytes));
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certificateSerialNumber = issuerAndSerialNumber[1].getBigInteger();
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// digestAlgorithmId
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DerValue tmp = derin.getDerValue();
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digestAlgorithmId = AlgorithmId.parse(tmp);
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// authenticatedAttributes
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if (oldStyle) {
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// In JDK1.1.x, the authenticatedAttributes are always present,
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// encoded as an empty Set (Set of length zero)
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derin.getSet(0);
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} else {
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// check if set of auth attributes (implicit tag) is provided
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// (auth attributes are OPTIONAL)
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if ((byte)(derin.peekByte()) == (byte)0xA0) {
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authenticatedAttributes = new PKCS9Attributes(derin);
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}
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}
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// digestEncryptionAlgorithmId - little RSA naming scheme -
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// signature == encryption...
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tmp = derin.getDerValue();
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digestEncryptionAlgorithmId = AlgorithmId.parse(tmp);
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// encryptedDigest
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encryptedDigest = derin.getOctetString();
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// unauthenticatedAttributes
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if (oldStyle) {
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// In JDK1.1.x, the unauthenticatedAttributes are always present,
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// encoded as an empty Set (Set of length zero)
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derin.getSet(0);
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} else {
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// check if set of unauth attributes (implicit tag) is provided
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// (unauth attributes are OPTIONAL)
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if (derin.available() != 0
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&& (byte)(derin.peekByte()) == (byte)0xA1) {
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unauthenticatedAttributes =
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new PKCS9Attributes(derin, true);// ignore unsupported attrs
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}
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}
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// all done
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if (derin.available() != 0) {
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throw new ParsingException("extra data at the end");
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}
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}
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public void encode(DerOutputStream out) throws IOException {
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derEncode(out);
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}
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/**
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* DER encode this object onto an output stream.
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* Implements the <code>DerEncoder</code> interface.
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*
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* @param out
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* the output stream on which to write the DER encoding.
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*
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* @exception IOException on encoding error.
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*/
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public void derEncode(OutputStream out) throws IOException {
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DerOutputStream seq = new DerOutputStream();
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seq.putInteger(version);
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DerOutputStream issuerAndSerialNumber = new DerOutputStream();
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issuerName.encode(issuerAndSerialNumber);
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issuerAndSerialNumber.putInteger(certificateSerialNumber);
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seq.write(DerValue.tag_Sequence, issuerAndSerialNumber);
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digestAlgorithmId.encode(seq);
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// encode authenticated attributes if there are any
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if (authenticatedAttributes != null)
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authenticatedAttributes.encode((byte)0xA0, seq);
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digestEncryptionAlgorithmId.encode(seq);
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seq.putOctetString(encryptedDigest);
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// encode unauthenticated attributes if there are any
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if (unauthenticatedAttributes != null)
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unauthenticatedAttributes.encode((byte)0xA1, seq);
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DerOutputStream tmp = new DerOutputStream();
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tmp.write(DerValue.tag_Sequence, seq);
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out.write(tmp.toByteArray());
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}
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/*
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* Returns the (user) certificate pertaining to this SignerInfo.
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*/
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public X509Certificate getCertificate(PKCS7 block)
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throws IOException
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{
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return block.getCertificate(certificateSerialNumber, issuerName);
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}
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/*
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* Returns the certificate chain pertaining to this SignerInfo.
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*/
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public ArrayList<X509Certificate> getCertificateChain(PKCS7 block)
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throws IOException
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{
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X509Certificate userCert;
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userCert = block.getCertificate(certificateSerialNumber, issuerName);
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if (userCert == null)
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return null;
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ArrayList<X509Certificate> certList = new ArrayList<X509Certificate>();
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certList.add(userCert);
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X509Certificate[] pkcsCerts = block.getCertificates();
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if (pkcsCerts == null
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|| userCert.getSubjectDN().equals(userCert.getIssuerDN())) {
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return certList;
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}
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Principal issuer = userCert.getIssuerDN();
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int start = 0;
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while (true) {
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boolean match = false;
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int i = start;
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while (i < pkcsCerts.length) {
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if (issuer.equals(pkcsCerts[i].getSubjectDN())) {
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// next cert in chain found
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certList.add(pkcsCerts[i]);
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// if selected cert is self-signed, we're done
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// constructing the chain
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if (pkcsCerts[i].getSubjectDN().equals(
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pkcsCerts[i].getIssuerDN())) {
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start = pkcsCerts.length;
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} else {
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issuer = pkcsCerts[i].getIssuerDN();
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X509Certificate tmpCert = pkcsCerts[start];
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pkcsCerts[start] = pkcsCerts[i];
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pkcsCerts[i] = tmpCert;
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start++;
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}
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match = true;
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break;
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} else {
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i++;
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}
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}
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if (!match)
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break;
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}
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return certList;
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}
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/* Returns null if verify fails, this signerInfo if
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verify succeeds. */
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SignerInfo verify(PKCS7 block, byte[] data)
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throws NoSuchAlgorithmException, SignatureException {
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try {
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ContentInfo content = block.getContentInfo();
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if (data == null) {
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data = content.getContentBytes();
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}
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String digestAlgname = getDigestAlgorithmId().getName();
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byte[] dataSigned;
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// if there are authenticate attributes, get the message
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// digest and compare it with the digest of data
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if (authenticatedAttributes == null) {
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dataSigned = data;
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} else {
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// first, check content type
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ObjectIdentifier contentType = (ObjectIdentifier)
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authenticatedAttributes.getAttributeValue(
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PKCS9Attribute.CONTENT_TYPE_OID);
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if (contentType == null ||
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!contentType.equals(content.contentType))
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return null; // contentType does not match, bad SignerInfo
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// now, check message digest
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byte[] messageDigest = (byte[])
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authenticatedAttributes.getAttributeValue(
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PKCS9Attribute.MESSAGE_DIGEST_OID);
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if (messageDigest == null) // fail if there is no message digest
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return null;
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MessageDigest md = MessageDigest.getInstance(digestAlgname);
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byte[] computedMessageDigest = md.digest(data);
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if (messageDigest.length != computedMessageDigest.length)
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return null;
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for (int i = 0; i < messageDigest.length; i++) {
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if (messageDigest[i] != computedMessageDigest[i])
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return null;
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}
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// message digest attribute matched
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// digest of original data
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// the data actually signed is the DER encoding of
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// the authenticated attributes (tagged with
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// the "SET OF" tag, not 0xA0).
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dataSigned = authenticatedAttributes.getDerEncoding();
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}
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// put together digest algorithm and encryption algorithm
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// to form signing algorithm
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String encryptionAlgname =
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getDigestEncryptionAlgorithmId().getName();
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// Workaround: sometimes the encryptionAlgname is actually
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// a signature name
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String tmp = AlgorithmId.getEncAlgFromSigAlg(encryptionAlgname);
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if (tmp != null) encryptionAlgname = tmp;
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String algname = AlgorithmId.makeSigAlg(
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digestAlgname, encryptionAlgname);
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Signature sig = Signature.getInstance(algname);
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X509Certificate cert = getCertificate(block);
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if (cert == null) {
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return null;
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}
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if (cert.hasUnsupportedCriticalExtension()) {
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throw new SignatureException("Certificate has unsupported "
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+ "critical extension(s)");
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}
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// Make sure that if the usage of the key in the certificate is
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// restricted, it can be used for digital signatures.
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// XXX We may want to check for additional extensions in the
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// future.
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boolean[] keyUsageBits = cert.getKeyUsage();
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if (keyUsageBits != null) {
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KeyUsageExtension keyUsage;
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try {
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// We don't care whether or not this extension was marked
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// critical in the certificate.
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// We're interested only in its value (i.e., the bits set)
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// and treat the extension as critical.
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keyUsage = new KeyUsageExtension(keyUsageBits);
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} catch (IOException ioe) {
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throw new SignatureException("Failed to parse keyUsage "
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+ "extension");
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}
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boolean digSigAllowed = ((Boolean)keyUsage.get(
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KeyUsageExtension.DIGITAL_SIGNATURE)).booleanValue();
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boolean nonRepuAllowed = ((Boolean)keyUsage.get(
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KeyUsageExtension.NON_REPUDIATION)).booleanValue();
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if (!digSigAllowed && !nonRepuAllowed) {
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throw new SignatureException("Key usage restricted: "
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+ "cannot be used for "
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+ "digital signatures");
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}
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}
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PublicKey key = cert.getPublicKey();
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sig.initVerify(key);
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sig.update(dataSigned);
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if (sig.verify(encryptedDigest)) {
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return this;
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}
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} catch (IOException e) {
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throw new SignatureException("IO error verifying signature:\n" +
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e.getMessage());
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} catch (InvalidKeyException e) {
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throw new SignatureException("InvalidKey: " + e.getMessage());
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}
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return null;
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}
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/* Verify the content of the pkcs7 block. */
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SignerInfo verify(PKCS7 block)
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throws NoSuchAlgorithmException, SignatureException {
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return verify(block, null);
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}
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public BigInteger getVersion() {
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return version;
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}
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public X500Name getIssuerName() {
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return issuerName;
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}
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public BigInteger getCertificateSerialNumber() {
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return certificateSerialNumber;
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}
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public AlgorithmId getDigestAlgorithmId() {
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return digestAlgorithmId;
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}
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public PKCS9Attributes getAuthenticatedAttributes() {
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return authenticatedAttributes;
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}
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public AlgorithmId getDigestEncryptionAlgorithmId() {
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return digestEncryptionAlgorithmId;
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}
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public byte[] getEncryptedDigest() {
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return encryptedDigest;
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}
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public PKCS9Attributes getUnauthenticatedAttributes() {
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return unauthenticatedAttributes;
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}
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public String toString() {
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HexDumpEncoder hexDump = new HexDumpEncoder();
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String out = "";
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out += "Signer Info for (issuer): " + issuerName + "\n";
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out += "\tversion: " + Debug.toHexString(version) + "\n";
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out += "\tcertificateSerialNumber: " +
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Debug.toHexString(certificateSerialNumber) + "\n";
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out += "\tdigestAlgorithmId: " + digestAlgorithmId + "\n";
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if (authenticatedAttributes != null) {
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out += "\tauthenticatedAttributes: " + authenticatedAttributes +
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"\n";
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}
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out += "\tdigestEncryptionAlgorithmId: " + digestEncryptionAlgorithmId +
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"\n";
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out += "\tencryptedDigest: " + "\n" +
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hexDump.encodeBuffer(encryptedDigest) + "\n";
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if (unauthenticatedAttributes != null) {
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out += "\tunauthenticatedAttributes: " +
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unauthenticatedAttributes + "\n";
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}
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return out;
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}
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}
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