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/*
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* Copyright (c) 2003, 2010, Oracle and/or its affiliates. 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.crypto.provider;
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import java.math.BigInteger;
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import java.util.*;
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import java.io.*;
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import sun.security.util.*;
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import sun.security.x509.*;
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import java.security.AlgorithmParametersSpi;
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import java.security.NoSuchAlgorithmException;
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import java.security.spec.AlgorithmParameterSpec;
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import java.security.spec.InvalidParameterSpecException;
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import java.security.spec.MGF1ParameterSpec;
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import javax.crypto.spec.PSource;
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import javax.crypto.spec.OAEPParameterSpec;
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/**
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* This class implements the OAEP parameters used with the RSA
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* algorithm in OAEP padding. Here is its ASN.1 definition:
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* RSAES-OAEP-params ::= SEQUENCE {
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* hashAlgorithm [0] HashAlgorithm DEFAULT sha1,
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* maskGenAlgorithm [1] MaskGenAlgorithm DEFAULT mgf1SHA1,
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* pSourceAlgorithm [2] PSourceAlgorithm DEFAULT pSpecifiedEmpty
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* }
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*
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* @author Valerie Peng
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*
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*/
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public final class OAEPParameters extends AlgorithmParametersSpi {
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private String mdName;
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private MGF1ParameterSpec mgfSpec;
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private byte[] p;
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private static ObjectIdentifier OID_MGF1;
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private static ObjectIdentifier OID_PSpecified;
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static {
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try {
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OID_MGF1 = new ObjectIdentifier(new int[] {1,2,840,113549,1,1,8});
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} catch (IOException ioe) {
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// should not happen
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OID_MGF1 = null;
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}
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try {
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OID_PSpecified =
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new ObjectIdentifier(new int[] {1,2,840,113549,1,1,9});
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} catch (IOException ioe) {
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// should not happen
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OID_PSpecified = null;
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}
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}
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public OAEPParameters() {
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}
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protected void engineInit(AlgorithmParameterSpec paramSpec)
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throws InvalidParameterSpecException {
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if (!(paramSpec instanceof OAEPParameterSpec)) {
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throw new InvalidParameterSpecException
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("Inappropriate parameter specification");
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}
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OAEPParameterSpec spec = (OAEPParameterSpec) paramSpec;
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mdName = spec.getDigestAlgorithm();
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String mgfName = spec.getMGFAlgorithm();
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if (!mgfName.equalsIgnoreCase("MGF1")) {
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throw new InvalidParameterSpecException("Unsupported mgf " +
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mgfName + "; MGF1 only");
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}
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AlgorithmParameterSpec mgfSpec = spec.getMGFParameters();
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if (!(mgfSpec instanceof MGF1ParameterSpec)) {
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throw new InvalidParameterSpecException("Inappropriate mgf " +
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"parameters; non-null MGF1ParameterSpec only");
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}
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this.mgfSpec = (MGF1ParameterSpec) mgfSpec;
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PSource pSrc = spec.getPSource();
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if (pSrc.getAlgorithm().equals("PSpecified")) {
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p = ((PSource.PSpecified) pSrc).getValue();
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} else {
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throw new InvalidParameterSpecException("Unsupported pSource " +
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pSrc.getAlgorithm() + "; PSpecified only");
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}
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}
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private static String convertToStandardName(String internalName) {
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if (internalName.equals("SHA")) {
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return "SHA-1";
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} else if (internalName.equals("SHA256")) {
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return "SHA-256";
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} else if (internalName.equals("SHA384")) {
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return "SHA-384";
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} else if (internalName.equals("SHA512")) {
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return "SHA-512";
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} else {
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return internalName;
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}
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}
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protected void engineInit(byte[] encoded)
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throws IOException {
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DerInputStream der = new DerInputStream(encoded);
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mdName = "SHA-1";
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mgfSpec = MGF1ParameterSpec.SHA1;
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p = new byte[0];
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DerValue[] datum = der.getSequence(3);
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for (int i=0; i<datum.length; i++) {
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DerValue data = datum[i];
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if (data.isContextSpecific((byte) 0x00)) {
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// hash algid
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mdName = convertToStandardName(AlgorithmId.parse
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(data.data.getDerValue()).getName());
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} else if (data.isContextSpecific((byte) 0x01)) {
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// mgf algid
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AlgorithmId val = AlgorithmId.parse(data.data.getDerValue());
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if (!val.getOID().equals((Object) OID_MGF1)) {
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throw new IOException("Only MGF1 mgf is supported");
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}
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AlgorithmId params = AlgorithmId.parse(
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new DerValue(val.getEncodedParams()));
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String mgfDigestName = convertToStandardName(params.getName());
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if (mgfDigestName.equals("SHA-1")) {
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mgfSpec = MGF1ParameterSpec.SHA1;
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} else if (mgfDigestName.equals("SHA-256")) {
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mgfSpec = MGF1ParameterSpec.SHA256;
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} else if (mgfDigestName.equals("SHA-384")) {
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mgfSpec = MGF1ParameterSpec.SHA384;
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} else if (mgfDigestName.equals("SHA-512")) {
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mgfSpec = MGF1ParameterSpec.SHA512;
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} else {
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throw new IOException(
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"Unrecognized message digest algorithm");
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}
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} else if (data.isContextSpecific((byte) 0x02)) {
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// pSource algid
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AlgorithmId val = AlgorithmId.parse(data.data.getDerValue());
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if (!val.getOID().equals((Object) OID_PSpecified)) {
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throw new IOException("Wrong OID for pSpecified");
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}
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DerInputStream dis = new DerInputStream(val.getEncodedParams());
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p = dis.getOctetString();
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if (dis.available() != 0) {
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throw new IOException("Extra data for pSpecified");
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}
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} else {
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throw new IOException("Invalid encoded OAEPParameters");
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}
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}
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}
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protected void engineInit(byte[] encoded, String decodingMethod)
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throws IOException {
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if ((decodingMethod != null) &&
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(!decodingMethod.equalsIgnoreCase("ASN.1"))) {
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throw new IllegalArgumentException("Only support ASN.1 format");
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}
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engineInit(encoded);
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}
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protected AlgorithmParameterSpec engineGetParameterSpec(Class paramSpec)
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throws InvalidParameterSpecException {
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if (OAEPParameterSpec.class.isAssignableFrom(paramSpec)) {
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return new OAEPParameterSpec(mdName, "MGF1", mgfSpec,
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new PSource.PSpecified(p));
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} else {
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throw new InvalidParameterSpecException
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("Inappropriate parameter specification");
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}
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}
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protected byte[] engineGetEncoded() throws IOException {
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DerOutputStream tmp = new DerOutputStream();
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DerOutputStream tmp2, tmp3;
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// MD
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AlgorithmId mdAlgId;
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try {
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mdAlgId = AlgorithmId.get(mdName);
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} catch (NoSuchAlgorithmException nsae) {
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throw new IOException("AlgorithmId " + mdName +
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" impl not found");
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}
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tmp2 = new DerOutputStream();
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mdAlgId.derEncode(tmp2);
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tmp.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0),
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tmp2);
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// MGF
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tmp2 = new DerOutputStream();
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tmp2.putOID(OID_MGF1);
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AlgorithmId mgfDigestId;
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try {
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mgfDigestId = AlgorithmId.get(mgfSpec.getDigestAlgorithm());
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} catch (NoSuchAlgorithmException nase) {
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throw new IOException("AlgorithmId " +
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mgfSpec.getDigestAlgorithm() + " impl not found");
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}
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mgfDigestId.encode(tmp2);
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tmp3 = new DerOutputStream();
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tmp3.write(DerValue.tag_Sequence, tmp2);
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tmp.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)1),
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tmp3);
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// PSource
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tmp2 = new DerOutputStream();
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tmp2.putOID(OID_PSpecified);
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tmp2.putOctetString(p);
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tmp3 = new DerOutputStream();
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tmp3.write(DerValue.tag_Sequence, tmp2);
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tmp.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)2),
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tmp3);
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// Put all together under a SEQUENCE tag
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DerOutputStream out = new DerOutputStream();
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out.write(DerValue.tag_Sequence, tmp);
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return out.toByteArray();
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}
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protected byte[] engineGetEncoded(String encodingMethod)
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throws IOException {
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if ((encodingMethod != null) &&
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(!encodingMethod.equalsIgnoreCase("ASN.1"))) {
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throw new IllegalArgumentException("Only support ASN.1 format");
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}
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return engineGetEncoded();
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}
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protected String engineToString() {
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StringBuffer sb = new StringBuffer();
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sb.append("MD: " + mdName + "\n");
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sb.append("MGF: MGF1" + mgfSpec.getDigestAlgorithm() + "\n");
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sb.append("PSource: PSpecified " +
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(p.length==0? "":Debug.toHexString(new BigInteger(p))) + "\n");
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return sb.toString();
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}
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}
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