/*
* Copyright (c) 1996, 2015, 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. 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.
*
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package sun.security.pkcs;
import java.io.*;
import java.math.BigInteger;
import java.net.URI;
import java.util.*;
import java.security.cert.X509Certificate;
import java.security.cert.CertificateException;
import java.security.cert.X509CRL;
import java.security.cert.CRLException;
import java.security.cert.CertificateFactory;
import java.security.*;
import sun.security.timestamp.*;
import sun.security.util.*;
import sun.security.x509.AlgorithmId;
import sun.security.x509.X509CertImpl;
import sun.security.x509.X509CertInfo;
import sun.security.x509.X509CRLImpl;
import sun.security.x509.X500Name;
/**
* PKCS7 as defined in RSA Laboratories PKCS7 Technical Note. Profile
* Supports only {@code SignedData} ContentInfo
* type, where to the type of data signed is plain Data.
* For signedData, {@code crls}, {@code attributes} and
* PKCS#6 Extended Certificates are not supported.
*
* @author Benjamin Renaud
*/
public class PKCS7 {
private ObjectIdentifier contentType;
// the ASN.1 members for a signedData (and other) contentTypes
private BigInteger version = null;
private AlgorithmId[] digestAlgorithmIds = null;
private ContentInfo contentInfo = null;
private X509Certificate[] certificates = null;
private X509CRL[] crls = null;
private SignerInfo[] signerInfos = null;
private boolean oldStyle = false; // Is this JDK1.1.x-style?
private Principal[] certIssuerNames;
/*
* Random number generator for creating nonce values
* (Lazy initialization)
*/
private static class SecureRandomHolder {
static final SecureRandom RANDOM;
static {
SecureRandom tmp = null;
try {
tmp = SecureRandom.getInstance("SHA1PRNG");
} catch (NoSuchAlgorithmException e) {
// should not happen
}
RANDOM = tmp;
}
}
/*
* Object identifier for the timestamping key purpose.
*/
private static final String KP_TIMESTAMPING_OID = "1.3.6.1.5.5.7.3.8";
/*
* Object identifier for extendedKeyUsage extension
*/
private static final String EXTENDED_KEY_USAGE_OID = "2.5.29.37";
/**
* Unmarshals a PKCS7 block from its encoded form, parsing the
* encoded bytes from the InputStream.
*
* @param in an input stream holding at least one PKCS7 block.
* @exception ParsingException on parsing errors.
* @exception IOException on other errors.
*/
public PKCS7(InputStream in) throws ParsingException, IOException {
DataInputStream dis = new DataInputStream(in);
byte[] data = new byte[dis.available()];
dis.readFully(data);
parse(new DerInputStream(data));
}
/**
* Unmarshals a PKCS7 block from its encoded form, parsing the
* encoded bytes from the DerInputStream.
*
* @param derin a DerInputStream holding at least one PKCS7 block.
* @exception ParsingException on parsing errors.
*/
public PKCS7(DerInputStream derin) throws ParsingException {
parse(derin);
}
/**
* Unmarshals a PKCS7 block from its encoded form, parsing the
* encoded bytes.
*
* @param bytes the encoded bytes.
* @exception ParsingException on parsing errors.
*/
public PKCS7(byte[] bytes) throws ParsingException {
try {
DerInputStream derin = new DerInputStream(bytes);
parse(derin);
} catch (IOException ioe1) {
ParsingException pe = new ParsingException(
"Unable to parse the encoded bytes");
pe.initCause(ioe1);
throw pe;
}
}
/*
* Parses a PKCS#7 block.
*/
private void parse(DerInputStream derin)
throws ParsingException
{
try {
derin.mark(derin.available());
// try new (i.e., JDK1.2) style
parse(derin, false);
} catch (IOException ioe) {
try {
derin.reset();
// try old (i.e., JDK1.1.x) style
parse(derin, true);
oldStyle = true;
} catch (IOException ioe1) {
ParsingException pe = new ParsingException(
ioe1.getMessage());
pe.initCause(ioe);
pe.addSuppressed(ioe1);
throw pe;
}
}
}
/**
* Parses a PKCS#7 block.
*
* @param derin the ASN.1 encoding of the PKCS#7 block.
* @param oldStyle flag indicating whether or not the given PKCS#7 block
* is encoded according to JDK1.1.x.
*/
private void parse(DerInputStream derin, boolean oldStyle)
throws IOException
{
contentInfo = new ContentInfo(derin, oldStyle);
contentType = contentInfo.contentType;
DerValue content = contentInfo.getContent();
if (contentType.equals(ContentInfo.SIGNED_DATA_OID)) {
parseSignedData(content);
} else if (contentType.equals(ContentInfo.OLD_SIGNED_DATA_OID)) {
// This is for backwards compatibility with JDK 1.1.x
parseOldSignedData(content);
} else if (contentType.equals(ContentInfo.NETSCAPE_CERT_SEQUENCE_OID)){
parseNetscapeCertChain(content);
} else {
throw new ParsingException("content type " + contentType +
" not supported.");
}
}
/**
* Construct an initialized PKCS7 block.
*
* @param digestAlgorithmIds the message digest algorithm identifiers.
* @param contentInfo the content information.
* @param certificates an array of X.509 certificates.
* @param crls an array of CRLs
* @param signerInfos an array of signer information.
*/
public PKCS7(AlgorithmId[] digestAlgorithmIds,
ContentInfo contentInfo,
X509Certificate[] certificates,
X509CRL[] crls,
SignerInfo[] signerInfos) {
version = BigInteger.ONE;
this.digestAlgorithmIds = digestAlgorithmIds;
this.contentInfo = contentInfo;
this.certificates = certificates;
this.crls = crls;
this.signerInfos = signerInfos;
}
public PKCS7(AlgorithmId[] digestAlgorithmIds,
ContentInfo contentInfo,
X509Certificate[] certificates,
SignerInfo[] signerInfos) {
this(digestAlgorithmIds, contentInfo, certificates, null, signerInfos);
}
private void parseNetscapeCertChain(DerValue val)
throws ParsingException, IOException {
DerInputStream dis = new DerInputStream(val.toByteArray());
DerValue[] contents = dis.getSequence(2);
certificates = new X509Certificate[contents.length];
CertificateFactory certfac = null;
try {
certfac = CertificateFactory.getInstance("X.509");
} catch (CertificateException ce) {
// do nothing
}
for (int i=0; i < contents.length; i++) {
ByteArrayInputStream bais = null;
try {
if (certfac == null)
certificates[i] = new X509CertImpl(contents[i]);
else {
byte[] encoded = contents[i].toByteArray();
bais = new ByteArrayInputStream(encoded);
certificates[i] =
(X509Certificate)certfac.generateCertificate(bais);
bais.close();
bais = null;
}
} catch (CertificateException ce) {
ParsingException pe = new ParsingException(ce.getMessage());
pe.initCause(ce);
throw pe;
} catch (IOException ioe) {
ParsingException pe = new ParsingException(ioe.getMessage());
pe.initCause(ioe);
throw pe;
} finally {
if (bais != null)
bais.close();
}
}
}
private void parseSignedData(DerValue val)
throws ParsingException, IOException {
DerInputStream dis = val.toDerInputStream();
// Version
version = dis.getBigInteger();
// digestAlgorithmIds
DerValue[] digestAlgorithmIdVals = dis.getSet(1);
int len = digestAlgorithmIdVals.length;
digestAlgorithmIds = new AlgorithmId[len];
try {
for (int i = 0; i < len; i++) {
DerValue oid = digestAlgorithmIdVals[i];
digestAlgorithmIds[i] = AlgorithmId.parse(oid);
}
} catch (IOException e) {
ParsingException pe =
new ParsingException("Error parsing digest AlgorithmId IDs: " +
e.getMessage());
pe.initCause(e);
throw pe;
}
// contentInfo
contentInfo = new ContentInfo(dis);
CertificateFactory certfac = null;
try {
certfac = CertificateFactory.getInstance("X.509");
} catch (CertificateException ce) {
// do nothing
}
/*
* check if certificates (implicit tag) are provided
* (certificates are OPTIONAL)
*/
if ((byte)(dis.peekByte()) == (byte)0xA0) {
DerValue[] certVals = dis.getSet(2, true);
len = certVals.length;
certificates = new X509Certificate[len];
int count = 0;
for (int i = 0; i < len; i++) {
ByteArrayInputStream bais = null;
try {
byte tag = certVals[i].getTag();
// We only parse the normal certificate. Other types of
// CertificateChoices ignored.
if (tag == DerValue.tag_Sequence) {
if (certfac == null) {
certificates[count] = new X509CertImpl(certVals[i]);
} else {
byte[] encoded = certVals[i].toByteArray();
bais = new ByteArrayInputStream(encoded);
certificates[count] =
(X509Certificate)certfac.generateCertificate(bais);
bais.close();
bais = null;
}
count++;
}
} catch (CertificateException ce) {
ParsingException pe = new ParsingException(ce.getMessage());
pe.initCause(ce);
throw pe;
} catch (IOException ioe) {
ParsingException pe = new ParsingException(ioe.getMessage());
pe.initCause(ioe);
throw pe;
} finally {
if (bais != null)
bais.close();
}
}
if (count != len) {
certificates = Arrays.copyOf(certificates, count);
}
}
// check if crls (implicit tag) are provided (crls are OPTIONAL)
if ((byte)(dis.peekByte()) == (byte)0xA1) {
DerValue[] crlVals = dis.getSet(1, true);
len = crlVals.length;
crls = new X509CRL[len];
for (int i = 0; i < len; i++) {
ByteArrayInputStream bais = null;
try {
if (certfac == null)
crls[i] = new X509CRLImpl(crlVals[i]);
else {
byte[] encoded = crlVals[i].toByteArray();
bais = new ByteArrayInputStream(encoded);
crls[i] = (X509CRL) certfac.generateCRL(bais);
bais.close();
bais = null;
}
} catch (CRLException e) {
ParsingException pe =
new ParsingException(e.getMessage());
pe.initCause(e);
throw pe;
} finally {
if (bais != null)
bais.close();
}
}
}
// signerInfos
DerValue[] signerInfoVals = dis.getSet(1);
len = signerInfoVals.length;
signerInfos = new SignerInfo[len];
for (int i = 0; i < len; i++) {
DerInputStream in = signerInfoVals[i].toDerInputStream();
signerInfos[i] = new SignerInfo(in);
}
}
/*
* Parses an old-style SignedData encoding (for backwards
* compatibility with JDK1.1.x).
*/
private void parseOldSignedData(DerValue val)
throws ParsingException, IOException
{
DerInputStream dis = val.toDerInputStream();
// Version
version = dis.getBigInteger();
// digestAlgorithmIds
DerValue[] digestAlgorithmIdVals = dis.getSet(1);
int len = digestAlgorithmIdVals.length;
digestAlgorithmIds = new AlgorithmId[len];
try {
for (int i = 0; i < len; i++) {
DerValue oid = digestAlgorithmIdVals[i];
digestAlgorithmIds[i] = AlgorithmId.parse(oid);
}
} catch (IOException e) {
throw new ParsingException("Error parsing digest AlgorithmId IDs");
}
// contentInfo
contentInfo = new ContentInfo(dis, true);
// certificates
CertificateFactory certfac = null;
try {
certfac = CertificateFactory.getInstance("X.509");
} catch (CertificateException ce) {
// do nothing
}
DerValue[] certVals = dis.getSet(2);
len = certVals.length;
certificates = new X509Certificate[len];
for (int i = 0; i < len; i++) {
ByteArrayInputStream bais = null;
try {
if (certfac == null)
certificates[i] = new X509CertImpl(certVals[i]);
else {
byte[] encoded = certVals[i].toByteArray();
bais = new ByteArrayInputStream(encoded);
certificates[i] =
(X509Certificate)certfac.generateCertificate(bais);
bais.close();
bais = null;
}
} catch (CertificateException ce) {
ParsingException pe = new ParsingException(ce.getMessage());
pe.initCause(ce);
throw pe;
} catch (IOException ioe) {
ParsingException pe = new ParsingException(ioe.getMessage());
pe.initCause(ioe);
throw pe;
} finally {
if (bais != null)
bais.close();
}
}
// crls are ignored.
dis.getSet(0);
// signerInfos
DerValue[] signerInfoVals = dis.getSet(1);
len = signerInfoVals.length;
signerInfos = new SignerInfo[len];
for (int i = 0; i < len; i++) {
DerInputStream in = signerInfoVals[i].toDerInputStream();
signerInfos[i] = new SignerInfo(in, true);
}
}
/**
* Encodes the signed data to an output stream.
*
* @param out the output stream to write the encoded data to.
* @exception IOException on encoding errors.
*/
public void encodeSignedData(OutputStream out) throws IOException {
DerOutputStream derout = new DerOutputStream();
encodeSignedData(derout);
out.write(derout.toByteArray());
}
/**
* Encodes the signed data to a DerOutputStream.
*
* @param out the DerOutputStream to write the encoded data to.
* @exception IOException on encoding errors.
*/
public void encodeSignedData(DerOutputStream out)
throws IOException
{
DerOutputStream signedData = new DerOutputStream();
// version
signedData.putInteger(version);
// digestAlgorithmIds
signedData.putOrderedSetOf(DerValue.tag_Set, digestAlgorithmIds);
// contentInfo
contentInfo.encode(signedData);
// certificates (optional)
if (certificates != null && certificates.length != 0) {
// cast to X509CertImpl[] since X509CertImpl implements DerEncoder
X509CertImpl[] implCerts = new X509CertImpl[certificates.length];
for (int i = 0; i < certificates.length; i++) {
if (certificates[i] instanceof X509CertImpl)
implCerts[i] = (X509CertImpl) certificates[i];
else {
try {
byte[] encoded = certificates[i].getEncoded();
implCerts[i] = new X509CertImpl(encoded);
} catch (CertificateException ce) {
throw new IOException(ce);
}
}
}
// Add the certificate set (tagged with [0] IMPLICIT)
// to the signed data
signedData.putOrderedSetOf((byte)0xA0, implCerts);
}
// CRLs (optional)
if (crls != null && crls.length != 0) {
// cast to X509CRLImpl[] since X509CRLImpl implements DerEncoder
Set<X509CRLImpl> implCRLs = new HashSet<>(crls.length);
for (X509CRL crl: crls) {
if (crl instanceof X509CRLImpl)
implCRLs.add((X509CRLImpl) crl);
else {
try {
byte[] encoded = crl.getEncoded();
implCRLs.add(new X509CRLImpl(encoded));
} catch (CRLException ce) {
throw new IOException(ce);
}
}
}
// Add the CRL set (tagged with [1] IMPLICIT)
// to the signed data
signedData.putOrderedSetOf((byte)0xA1,
implCRLs.toArray(new X509CRLImpl[implCRLs.size()]));
}
// signerInfos
signedData.putOrderedSetOf(DerValue.tag_Set, signerInfos);
// making it a signed data block
DerValue signedDataSeq = new DerValue(DerValue.tag_Sequence,
signedData.toByteArray());
// making it a content info sequence
ContentInfo block = new ContentInfo(ContentInfo.SIGNED_DATA_OID,
signedDataSeq);
// writing out the contentInfo sequence
block.encode(out);
}
/**
* This verifies a given SignerInfo.
*
* @param info the signer information.
* @param bytes the DER encoded content information.
*
* @exception NoSuchAlgorithmException on unrecognized algorithms.
* @exception SignatureException on signature handling errors.
*/
public SignerInfo verify(SignerInfo info, byte[] bytes)
throws NoSuchAlgorithmException, SignatureException {
return info.verify(this, bytes);
}
/**
* Returns all signerInfos which self-verify.
*
* @param bytes the DER encoded content information.
*
* @exception NoSuchAlgorithmException on unrecognized algorithms.
* @exception SignatureException on signature handling errors.
*/
public SignerInfo[] verify(byte[] bytes)
throws NoSuchAlgorithmException, SignatureException {
Vector<SignerInfo> intResult = new Vector<>();
for (int i = 0; i < signerInfos.length; i++) {
SignerInfo signerInfo = verify(signerInfos[i], bytes);
if (signerInfo != null) {
intResult.addElement(signerInfo);
}
}
if (!intResult.isEmpty()) {
SignerInfo[] result = new SignerInfo[intResult.size()];
intResult.copyInto(result);
return result;
}
return null;
}
/**
* Returns all signerInfos which self-verify.
*
* @exception NoSuchAlgorithmException on unrecognized algorithms.
* @exception SignatureException on signature handling errors.
*/
public SignerInfo[] verify()
throws NoSuchAlgorithmException, SignatureException {
return verify(null);
}
/**
* Returns the version number of this PKCS7 block.
* @return the version or null if version is not specified
* for the content type.
*/
public BigInteger getVersion() {
return version;
}
/**
* Returns the message digest algorithms specified in this PKCS7 block.
* @return the array of Digest Algorithms or null if none are specified
* for the content type.
*/
public AlgorithmId[] getDigestAlgorithmIds() {
return digestAlgorithmIds;
}
/**
* Returns the content information specified in this PKCS7 block.
*/
public ContentInfo getContentInfo() {
return contentInfo;
}
/**
* Returns the X.509 certificates listed in this PKCS7 block.
* @return a clone of the array of X.509 certificates or null if
* none are specified for the content type.
*/
public X509Certificate[] getCertificates() {
if (certificates != null)
return certificates.clone();
else
return null;
}
/**
* Returns the X.509 crls listed in this PKCS7 block.
* @return a clone of the array of X.509 crls or null if none
* are specified for the content type.
*/
public X509CRL[] getCRLs() {
if (crls != null)
return crls.clone();
else
return null;
}
/**
* Returns the signer's information specified in this PKCS7 block.
* @return the array of Signer Infos or null if none are specified
* for the content type.
*/
public SignerInfo[] getSignerInfos() {
return signerInfos;
}
/**
* Returns the X.509 certificate listed in this PKCS7 block
* which has a matching serial number and Issuer name, or
* null if one is not found.
*
* @param serial the serial number of the certificate to retrieve.
* @param issuerName the Distinguished Name of the Issuer.
*/
public X509Certificate getCertificate(BigInteger serial, X500Name issuerName) {
if (certificates != null) {
if (certIssuerNames == null)
populateCertIssuerNames();
for (int i = 0; i < certificates.length; i++) {
X509Certificate cert = certificates[i];
BigInteger thisSerial = cert.getSerialNumber();
if (serial.equals(thisSerial)
&& issuerName.equals(certIssuerNames[i]))
{
return cert;
}
}
}
return null;
}
/**
* Populate array of Issuer DNs from certificates and convert
* each Principal to type X500Name if necessary.
*/
private void populateCertIssuerNames() {
if (certificates == null)
return;
certIssuerNames = new Principal[certificates.length];
for (int i = 0; i < certificates.length; i++) {
X509Certificate cert = certificates[i];
Principal certIssuerName = cert.getIssuerDN();
if (!(certIssuerName instanceof X500Name)) {
// must extract the original encoded form of DN for
// subsequent name comparison checks (converting to a
// String and back to an encoded DN could cause the
// types of String attribute values to be changed)
try {
X509CertInfo tbsCert =
new X509CertInfo(cert.getTBSCertificate());
certIssuerName = (Principal)
tbsCert.get(X509CertInfo.ISSUER + "." +
X509CertInfo.DN_NAME);
} catch (Exception e) {
// error generating X500Name object from the cert's
// issuer DN, leave name as is.
}
}
certIssuerNames[i] = certIssuerName;
}
}
/**
* Returns the PKCS7 block in a printable string form.
*/
public String toString() {
String out = "";
out += contentInfo + "\n";
if (version != null)
out += "PKCS7 :: version: " + Debug.toHexString(version) + "\n";
if (digestAlgorithmIds != null) {
out += "PKCS7 :: digest AlgorithmIds: \n";
for (int i = 0; i < digestAlgorithmIds.length; i++)
out += "\t" + digestAlgorithmIds[i] + "\n";
}
if (certificates != null) {
out += "PKCS7 :: certificates: \n";
for (int i = 0; i < certificates.length; i++)
out += "\t" + i + ". " + certificates[i] + "\n";
}
if (crls != null) {
out += "PKCS7 :: crls: \n";
for (int i = 0; i < crls.length; i++)
out += "\t" + i + ". " + crls[i] + "\n";
}
if (signerInfos != null) {
out += "PKCS7 :: signer infos: \n";
for (int i = 0; i < signerInfos.length; i++)
out += ("\t" + i + ". " + signerInfos[i] + "\n");
}
return out;
}
/**
* Returns true if this is a JDK1.1.x-style PKCS#7 block, and false
* otherwise.
*/
public boolean isOldStyle() {
return this.oldStyle;
}
/**
* Assembles a PKCS #7 signed data message that optionally includes a
* signature timestamp.
*
* @param signature the signature bytes
* @param signerChain the signer's X.509 certificate chain
* @param content the content that is signed; specify null to not include
* it in the PKCS7 data
* @param signatureAlgorithm the name of the signature algorithm
* @param tsaURI the URI of the Timestamping Authority; or null if no
* timestamp is requested
* @param tSAPolicyID the TSAPolicyID of the Timestamping Authority as a
* numerical object identifier; or null if we leave the TSA server
* to choose one. This argument is only used when tsaURI is provided
* @return the bytes of the encoded PKCS #7 signed data message
* @throws NoSuchAlgorithmException The exception is thrown if the signature
* algorithm is unrecognised.
* @throws CertificateException The exception is thrown if an error occurs
* while processing the signer's certificate or the TSA's
* certificate.
* @throws IOException The exception is thrown if an error occurs while
* generating the signature timestamp or while generating the signed
* data message.
*/
public static byte[] generateSignedData(byte[] signature,
X509Certificate[] signerChain,
byte[] content,
String signatureAlgorithm,
URI tsaURI,
String tSAPolicyID,
String tSADigestAlg)
throws CertificateException, IOException, NoSuchAlgorithmException
{
// Generate the timestamp token
PKCS9Attributes unauthAttrs = null;
if (tsaURI != null) {
// Timestamp the signature
HttpTimestamper tsa = new HttpTimestamper(tsaURI);
byte[] tsToken = generateTimestampToken(
tsa, tSAPolicyID, tSADigestAlg, signature);
// Insert the timestamp token into the PKCS #7 signer info element
// (as an unsigned attribute)
unauthAttrs =
new PKCS9Attributes(new PKCS9Attribute[]{
new PKCS9Attribute(
PKCS9Attribute.SIGNATURE_TIMESTAMP_TOKEN_STR,
tsToken)});
}
// Create the SignerInfo
X500Name issuerName =
X500Name.asX500Name(signerChain[0].getIssuerX500Principal());
BigInteger serialNumber = signerChain[0].getSerialNumber();
String encAlg = AlgorithmId.getEncAlgFromSigAlg(signatureAlgorithm);
String digAlg = AlgorithmId.getDigAlgFromSigAlg(signatureAlgorithm);
SignerInfo signerInfo = new SignerInfo(issuerName, serialNumber,
AlgorithmId.get(digAlg), null,
AlgorithmId.get(encAlg),
signature, unauthAttrs);
// Create the PKCS #7 signed data message
SignerInfo[] signerInfos = {signerInfo};
AlgorithmId[] algorithms = {signerInfo.getDigestAlgorithmId()};
// Include or exclude content
ContentInfo contentInfo = (content == null)
? new ContentInfo(ContentInfo.DATA_OID, null)
: new ContentInfo(content);
PKCS7 pkcs7 = new PKCS7(algorithms, contentInfo,
signerChain, signerInfos);
ByteArrayOutputStream p7out = new ByteArrayOutputStream();
pkcs7.encodeSignedData(p7out);
return p7out.toByteArray();
}
/**
* Requests, processes and validates a timestamp token from a TSA using
* common defaults. Uses the following defaults in the timestamp request:
* SHA-1 for the hash algorithm, a 64-bit nonce, and request certificate
* set to true.
*
* @param tsa the timestamping authority to use
* @param tSAPolicyID the TSAPolicyID of the Timestamping Authority as a
* numerical object identifier; or null if we leave the TSA server
* to choose one
* @param toBeTimestamped the token that is to be timestamped
* @return the encoded timestamp token
* @throws IOException The exception is thrown if an error occurs while
* communicating with the TSA, or a non-null
* TSAPolicyID is specified in the request but it
* does not match the one in the reply
* @throws CertificateException The exception is thrown if the TSA's
* certificate is not permitted for timestamping.
*/
private static byte[] generateTimestampToken(Timestamper tsa,
String tSAPolicyID,
String tSADigestAlg,
byte[] toBeTimestamped)
throws IOException, CertificateException
{
// Generate a timestamp
MessageDigest messageDigest = null;
TSRequest tsQuery = null;
try {
messageDigest = MessageDigest.getInstance(tSADigestAlg);
tsQuery = new TSRequest(tSAPolicyID, toBeTimestamped, messageDigest);
} catch (NoSuchAlgorithmException e) {
throw new IllegalArgumentException(e);
}
// Generate a nonce
BigInteger nonce = null;
if (SecureRandomHolder.RANDOM != null) {
nonce = new BigInteger(64, SecureRandomHolder.RANDOM);
tsQuery.setNonce(nonce);
}
tsQuery.requestCertificate(true);
TSResponse tsReply = tsa.generateTimestamp(tsQuery);
int status = tsReply.getStatusCode();
// Handle TSP error
if (status != 0 && status != 1) {
throw new IOException("Error generating timestamp: " +
tsReply.getStatusCodeAsText() + " " +
tsReply.getFailureCodeAsText());
}
if (tSAPolicyID != null &&
!tSAPolicyID.equals(tsReply.getTimestampToken().getPolicyID())) {
throw new IOException("TSAPolicyID changed in "
+ "timestamp token");
}
PKCS7 tsToken = tsReply.getToken();
TimestampToken tst = tsReply.getTimestampToken();
try {
if (!tst.getHashAlgorithm().equals(AlgorithmId.get(tSADigestAlg))) {
throw new IOException("Digest algorithm not " + tSADigestAlg + " in "
+ "timestamp token");
}
} catch (NoSuchAlgorithmException nase) {
throw new IllegalArgumentException(); // should have been caught before
}
if (!MessageDigest.isEqual(tst.getHashedMessage(),
tsQuery.getHashedMessage())) {
throw new IOException("Digest octets changed in timestamp token");
}
BigInteger replyNonce = tst.getNonce();
if (replyNonce == null && nonce != null) {
throw new IOException("Nonce missing in timestamp token");
}
if (replyNonce != null && !replyNonce.equals(nonce)) {
throw new IOException("Nonce changed in timestamp token");
}
// Examine the TSA's certificate (if present)
for (SignerInfo si: tsToken.getSignerInfos()) {
X509Certificate cert = si.getCertificate(tsToken);
if (cert == null) {
// Error, we've already set tsRequestCertificate = true
throw new CertificateException(
"Certificate not included in timestamp token");
} else {
if (!cert.getCriticalExtensionOIDs().contains(
EXTENDED_KEY_USAGE_OID)) {
throw new CertificateException(
"Certificate is not valid for timestamping");
}
List<String> keyPurposes = cert.getExtendedKeyUsage();
if (keyPurposes == null ||
!keyPurposes.contains(KP_TIMESTAMPING_OID)) {
throw new CertificateException(
"Certificate is not valid for timestamping");
}
}
}
return tsReply.getEncodedToken();
}
}