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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package com.tencent.kona.sun.security.pkcs;
import java.io.IOException;
import java.math.BigInteger;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.CertPath;
import java.security.cert.X509Certificate;
import java.security.*;
import java.security.spec.PSSParameterSpec;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import com.tencent.kona.crypto.CryptoInsts;
import com.tencent.kona.pkix.PKIXInsts;
import com.tencent.kona.sun.security.timestamp.TimestampToken;
import com.tencent.kona.sun.security.util.Debug;
import com.tencent.kona.sun.security.util.DerEncoder;
import com.tencent.kona.sun.security.util.DerInputStream;
import com.tencent.kona.sun.security.util.DerOutputStream;
import com.tencent.kona.sun.security.util.DerValue;
import com.tencent.kona.sun.security.util.DisabledAlgorithmConstraints;
import com.tencent.kona.sun.security.util.HexDumpEncoder;
import com.tencent.kona.sun.security.util.KeyUtil;
import com.tencent.kona.sun.security.util.KnownOIDs;
import com.tencent.kona.sun.security.util.ObjectIdentifier;
import com.tencent.kona.sun.security.util.Oid;
import com.tencent.kona.sun.security.util.SignatureUtil;
import com.tencent.kona.sun.security.x509.AlgorithmId;
import com.tencent.kona.sun.security.x509.KeyUsageExtension;
import com.tencent.kona.sun.security.x509.X500Name;
/**
* A SignerInfo, as defined in PKCS#7's signedData type.
*
* @author Benjamin Renaud
*/
public class SignerInfo implements DerEncoder {
private static final DisabledAlgorithmConstraints JAR_DISABLED_CHECK =
DisabledAlgorithmConstraints.jarConstraints();
BigInteger version;
X500Name issuerName;
BigInteger certificateSerialNumber;
AlgorithmId digestAlgorithmId;
AlgorithmId digestEncryptionAlgorithmId;
byte[] encryptedDigest;
Timestamp timestamp;
private boolean hasTimestamp = true;
private static final Debug debug = Debug.getInstance("jar");
PKCS9Attributes authenticatedAttributes;
PKCS9Attributes unauthenticatedAttributes;
/**
* A map containing the algorithms in this SignerInfo. This is used to
* avoid checking algorithms to see if they are disabled more than once.
* The key is the AlgorithmId of the algorithm, and the value is a record
* containing the name of the field or attribute and whether the key
* should also be checked (ex: if it is a signature algorithm).
*/
private static class AlgorithmInfo {
private final String field;
private final boolean checkKey;
AlgorithmInfo(String field, boolean checkKey) {
this.field = field;
this.checkKey = checkKey;
}
}
private final Map algorithms = new HashMap<>();
public SignerInfo(X500Name issuerName,
BigInteger serial,
AlgorithmId digestAlgorithmId,
AlgorithmId digestEncryptionAlgorithmId,
byte[] encryptedDigest) {
this(issuerName, serial, digestAlgorithmId, null,
digestEncryptionAlgorithmId, encryptedDigest, null);
}
public SignerInfo(X500Name issuerName,
BigInteger serial,
AlgorithmId digestAlgorithmId,
PKCS9Attributes authenticatedAttributes,
AlgorithmId digestEncryptionAlgorithmId,
byte[] encryptedDigest,
PKCS9Attributes unauthenticatedAttributes) {
this.version = BigInteger.ONE;
this.issuerName = issuerName;
this.certificateSerialNumber = serial;
this.digestAlgorithmId = digestAlgorithmId;
this.authenticatedAttributes = authenticatedAttributes;
this.digestEncryptionAlgorithmId = digestEncryptionAlgorithmId;
this.encryptedDigest = encryptedDigest;
this.unauthenticatedAttributes = unauthenticatedAttributes;
}
/**
* Parses a PKCS#7 signer info.
*/
public SignerInfo(DerInputStream derin) throws IOException {
this(derin, false);
}
/**
* Parses a PKCS#7 signer info.
*
* 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 signer info.
* @param oldStyle flag indicating whether the given signer info
* is encoded according to JDK1.1.x.
*/
public SignerInfo(DerInputStream derin, boolean oldStyle)
throws IOException {
// version
version = derin.getBigInteger();
// issuerAndSerialNumber
DerValue[] issuerAndSerialNumber = derin.getSequence(2);
if (issuerAndSerialNumber.length != 2) {
throw new ParsingException("Invalid length for IssuerAndSerialNumber");
}
byte[] issuerBytes = issuerAndSerialNumber[0].toByteArray();
issuerName = new X500Name(new DerValue(DerValue.tag_Sequence,
issuerBytes));
certificateSerialNumber = issuerAndSerialNumber[1].getBigInteger();
// digestAlgorithmId
DerValue tmp = derin.getDerValue();
digestAlgorithmId = AlgorithmId.parse(tmp);
// authenticatedAttributes
if (oldStyle) {
// In JDK1.1.x, the authenticatedAttributes are always present,
// encoded as an empty Set (Set of length zero)
derin.getSet(0);
} else {
// check if set of auth attributes (implicit tag) is provided
// (auth attributes are OPTIONAL)
if ((byte)(derin.peekByte()) == (byte)0xA0) {
authenticatedAttributes = new PKCS9Attributes(derin);
}
}
// digestEncryptionAlgorithmId - little RSA naming scheme -
// signature == encryption...
tmp = derin.getDerValue();
digestEncryptionAlgorithmId = AlgorithmId.parse(tmp);
// encryptedDigest
encryptedDigest = derin.getOctetString();
// unauthenticatedAttributes
if (oldStyle) {
// In JDK1.1.x, the unauthenticatedAttributes are always present,
// encoded as an empty Set (Set of length zero)
derin.getSet(0);
} else {
// check if set of unauth attributes (implicit tag) is provided
// (unauth attributes are OPTIONAL)
if (derin.available() != 0
&& (byte)(derin.peekByte()) == (byte)0xA1) {
unauthenticatedAttributes =
new PKCS9Attributes(derin, true);// ignore unsupported attrs
}
}
// all done
if (derin.available() != 0) {
throw new ParsingException("extra data at the end");
}
// verify CMSAlgorithmProtection
checkCMSAlgorithmProtection();
}
// CMSAlgorithmProtection verification as described in RFC 6211
private void checkCMSAlgorithmProtection() throws IOException {
if (authenticatedAttributes == null) {
return;
}
PKCS9Attribute ap = authenticatedAttributes.getAttribute(
PKCS9Attribute.CMS_ALGORITHM_PROTECTION_OID);
if (ap == null) {
return;
}
DerValue dv = new DerValue((byte[])ap.getValue());
DerInputStream data = dv.getData();
AlgorithmId d = AlgorithmId.parse(data.getDerValue());
DerValue ds = data.getDerValue();
if (data.available() > 0) {
throw new IOException("Unknown field in CMSAlgorithmProtection");
}
if (!ds.isContextSpecific((byte)1)) {
throw new IOException("No signature algorithm in CMSAlgorithmProtection");
}
AlgorithmId s = AlgorithmId.parse(ds.withTag(DerValue.tag_Sequence));
if (!s.equals(digestEncryptionAlgorithmId)
|| !d.equals(digestAlgorithmId)) {
throw new IOException("CMSAlgorithmProtection check failed");
}
}
/**
* DER encode this object onto an output stream.
* Implements the {@code DerEncoder} interface.
*
* @param out
* the output stream on which to write the DER encoding.
*/
@Override
public void encode(DerOutputStream out) {
DerOutputStream seq = new DerOutputStream();
seq.putInteger(version);
DerOutputStream issuerAndSerialNumber = new DerOutputStream();
issuerName.encode(issuerAndSerialNumber);
issuerAndSerialNumber.putInteger(certificateSerialNumber);
seq.write(DerValue.tag_Sequence, issuerAndSerialNumber);
digestAlgorithmId.encode(seq);
// encode authenticated attributes if there are any
if (authenticatedAttributes != null)
authenticatedAttributes.encode((byte)0xA0, seq);
digestEncryptionAlgorithmId.encode(seq);
seq.putOctetString(encryptedDigest);
// encode unauthenticated attributes if there are any
if (unauthenticatedAttributes != null)
unauthenticatedAttributes.encode((byte)0xA1, seq);
out.write(DerValue.tag_Sequence, seq);
}
/*
* Returns the (user) certificate pertaining to this SignerInfo.
*/
public X509Certificate getCertificate(PKCS7 block)
throws IOException
{
return block.getCertificate(certificateSerialNumber, issuerName);
}
/*
* Returns the certificate chain pertaining to this SignerInfo.
*/
public ArrayList getCertificateChain(PKCS7 block)
throws IOException
{
X509Certificate userCert;
userCert = block.getCertificate(certificateSerialNumber, issuerName);
if (userCert == null)
return null;
ArrayList certList = new ArrayList<>();
certList.add(userCert);
X509Certificate[] pkcsCerts = block.getCertificates();
if (pkcsCerts == null
|| userCert.getSubjectX500Principal().equals(userCert.getIssuerX500Principal())) {
return certList;
}
Principal issuer = userCert.getIssuerX500Principal();
int start = 0;
while (true) {
boolean match = false;
int i = start;
while (i < pkcsCerts.length) {
if (issuer.equals(pkcsCerts[i].getSubjectX500Principal())) {
// next cert in chain found
certList.add(pkcsCerts[i]);
// if selected cert is self-signed, we're done
// constructing the chain
if (pkcsCerts[i].getSubjectX500Principal().equals(
pkcsCerts[i].getIssuerX500Principal())) {
start = pkcsCerts.length;
} else {
issuer = pkcsCerts[i].getIssuerX500Principal();
X509Certificate tmpCert = pkcsCerts[start];
pkcsCerts[start] = pkcsCerts[i];
pkcsCerts[i] = tmpCert;
start++;
}
match = true;
break;
} else {
i++;
}
}
if (!match)
break;
}
return certList;
}
/* Returns null if verify fails, this signerInfo if
verify succeeds. */
SignerInfo verify(PKCS7 block, byte[] data)
throws NoSuchAlgorithmException, SignatureException {
try {
Timestamp timestamp = null;
try {
timestamp = getTimestamp();
} catch (Exception e) {
// Log exception and continue. This allows for the case
// where, if there are no other errors, the code is
// signed but w/o a timestamp.
if (debug != null) {
debug.println("Unexpected exception while getting" +
" timestamp: " + e);
}
}
ContentInfo content = block.getContentInfo();
if (data == null) {
data = content.getContentBytes();
}
String digestAlgName = digestAlgorithmId.getName();
algorithms.put(digestAlgorithmId,
new AlgorithmInfo("SignerInfo digestAlgorithm field", false));
byte[] dataSigned;
// if there are authenticated attributes, get the message
// digest and compare it with the digest of data
if (authenticatedAttributes == null) {
dataSigned = data;
} else {
// first, check content type
ObjectIdentifier contentType = (ObjectIdentifier)
authenticatedAttributes.getAttributeValue(
PKCS9Attribute.CONTENT_TYPE_OID);
if (contentType == null ||
!contentType.equals((Object) content.contentType))
return null; // contentType does not match, bad SignerInfo
// now, check message digest
byte[] messageDigest = (byte[])
authenticatedAttributes.getAttributeValue(
PKCS9Attribute.MESSAGE_DIGEST_OID);
if (messageDigest == null) // fail if there is no message digest
return null;
MessageDigest md = CryptoInsts.getMessageDigest(digestAlgName);
byte[] computedMessageDigest = md.digest(data);
if (!MessageDigest.isEqual(messageDigest, computedMessageDigest)) {
return null;
}
// message digest attribute matched
// digest of original data
// the data actually signed is the DER encoding of
// the authenticated attributes (tagged with
// the "SET OF" tag, not 0xA0).
dataSigned = authenticatedAttributes.getDerEncoding();
}
// put together digest algorithm and encryption algorithm
// to form signing algorithm. See makeSigAlg for details.
String sigAlgName = makeSigAlg(
digestAlgorithmId,
digestEncryptionAlgorithmId);
KnownOIDs oid = KnownOIDs.findMatch(sigAlgName);
if (oid != null) {
AlgorithmId sigAlgId =
new AlgorithmId(Oid.of(oid),
digestEncryptionAlgorithmId.getParameters());
algorithms.put(sigAlgId,
new AlgorithmInfo(
"SignerInfo digestEncryptionAlgorithm field", true));
}
X509Certificate cert = getCertificate(block);
if (cert == null) {
return null;
}
PublicKey key = cert.getPublicKey();
if (cert.hasUnsupportedCriticalExtension()) {
throw new SignatureException("Certificate has unsupported "
+ "critical extension(s)");
}
algorithmsConformanceCheck(
digestAlgorithmId,
digestEncryptionAlgorithmId,
key,
authenticatedAttributes == null);
// Make sure that if the usage of the key in the certificate is
// restricted, it can be used for digital signatures.
// XXX We may want to check for additional extensions in the
// future.
boolean[] keyUsageBits = cert.getKeyUsage();
if (keyUsageBits != null) {
KeyUsageExtension keyUsage;
// We don't care whether this extension was marked
// critical in the certificate.
// We're interested only in its value (i.e., the bits set)
// and treat the extension as critical.
keyUsage = new KeyUsageExtension(keyUsageBits);
boolean digSigAllowed
= keyUsage.get(KeyUsageExtension.DIGITAL_SIGNATURE);
boolean nonRepuAllowed
= keyUsage.get(KeyUsageExtension.NON_REPUDIATION);
if (!digSigAllowed && !nonRepuAllowed) {
throw new SignatureException("Key usage restricted: "
+ "cannot be used for "
+ "digital signatures");
}
}
Signature sig = CryptoInsts.getSignature(sigAlgName);
AlgorithmParameters ap =
digestEncryptionAlgorithmId.getParameters();
try {
SignatureUtil.initVerifyWithParam(sig, key,
SignatureUtil.getParamSpec(sigAlgName, ap));
} catch (ProviderException | InvalidAlgorithmParameterException |
InvalidKeyException e) {
throw new SignatureException(e.getMessage(), e);
}
sig.update(dataSigned);
if (sig.verify(encryptedDigest)) {
return this;
}
} catch (IOException e) {
throw new SignatureException("Error verifying signature", e);
}
return null;
}
/**
* Checks if the digest algorithm and encryption algorithm combination
* inside a PKCS7 SignerInfo is legal.
*
* @param digAlgId the digest algorithm
* @param encAlgId the encryption algorithm
* @param key the public key for verification
* @param directSign whether the signature is calculated on the content
* directly. This makes difference for Ed448.
*/
private static void algorithmsConformanceCheck(
AlgorithmId digAlgId, AlgorithmId encAlgId, PublicKey key,
boolean directSign) throws NoSuchAlgorithmException {
String encAlg = encAlgId.getName();
switch (encAlg) {
case "RSASSA-PSS":
PSSParameterSpec spec = (PSSParameterSpec)
SignatureUtil.getParamSpec(encAlg, encAlgId.getParameters());
/*
* RFC 4056 section 3 for Signed-data:
* signatureAlgorithm MUST contain id-RSASSA-PSS. The algorithm
* parameters field MUST contain RSASSA-PSS-params.
*/
if (spec == null) {
throw new NoSuchAlgorithmException("Missing PSSParameterSpec for RSASSA-PSS algorithm");
}
if (!AlgorithmId.get(spec.getDigestAlgorithm()).equals(digAlgId)) {
throw new NoSuchAlgorithmException("Incompatible digest algorithm");
}
break;
// case "Ed25519":
// if (!digAlgId.equals(SignatureUtil.EdDSADigestAlgHolder.sha512)) {
// throw new NoSuchAlgorithmException("Incompatible digest algorithm");
// }
// break;
// case "Ed448":
// if (directSign) {
// if (!digAlgId.equals(SignatureUtil.EdDSADigestAlgHolder.shake256)) {
// throw new NoSuchAlgorithmException("Incompatible digest algorithm");
// }
// } else {
// if (!digAlgId.equals(SignatureUtil.EdDSADigestAlgHolder.shake256$512)) {
// throw new NoSuchAlgorithmException("Incompatible digest algorithm");
// }
// }
// break;
case "HSS/LMS":
// RFC 8708 requires the same hash algorithm used as in the HSS/LMS algorithm
if (!digAlgId.equals(AlgorithmId.get(KeyUtil.hashAlgFromHSS(key)))) {
throw new NoSuchAlgorithmException("Incompatible digest algorithm");
}
break;
}
}
/**
* Derives the signature algorithm name from the digest algorithm
* and the encryption algorithm inside a PKCS7 SignerInfo.
*
* The digest algorithm is in the form "DIG", and the encryption
* algorithm can be in any of the 3 forms:
*
* 1. Old style key algorithm like RSA, DSA, EC, this method returns
* DIGwithKEY.
* 2. New style signature algorithm in the form of HASHwithKEY, this
* method returns DIGwithKEY. Please note this is not HASHwithKEY.
* 3. Modern signature algorithm like RSASSA-PSS and EdDSA, this method
* returns the signature algorithm itself.
*
* @param digAlgId the digest algorithm
* @param encAlgId the encryption algorithm
*/
public static String makeSigAlg(AlgorithmId digAlgId, AlgorithmId encAlgId) {
String encAlg = encAlgId.getName();
switch (encAlg) {
case "RSASSA-PSS":
case "Ed25519":
case "Ed448":
case "HSS/LMS":
return encAlg;
default:
String digAlg = digAlgId.getName();
String keyAlg = SignatureUtil.extractKeyAlgFromDwithE(encAlg);
if (keyAlg == null) {
// The encAlg used to be only the key alg
keyAlg = encAlg;
}
if (digAlg.startsWith("SHA-")) {
digAlg = "SHA" + digAlg.substring(4);
}
if (keyAlg.equals("EC")) keyAlg = "ECDSA";
String sigAlg = digAlg + "with" + keyAlg;
try {
Signature.getInstance(sigAlg);
return sigAlg;
} catch (NoSuchAlgorithmException e) {
// Possibly an unknown modern signature algorithm,
// in this case, encAlg should already be a signature
// algorithm.
return encAlg;
}
}
}
/* Verify the content of the pkcs7 block. */
SignerInfo verify(PKCS7 block)
throws NoSuchAlgorithmException, SignatureException {
return verify(block, null);
}
public BigInteger getVersion() {
return version;
}
public X500Name getIssuerName() {
return issuerName;
}
public BigInteger getCertificateSerialNumber() {
return certificateSerialNumber;
}
public AlgorithmId getDigestAlgorithmId() {
return digestAlgorithmId;
}
public PKCS9Attributes getAuthenticatedAttributes() {
return authenticatedAttributes;
}
public AlgorithmId getDigestEncryptionAlgorithmId() {
return digestEncryptionAlgorithmId;
}
public byte[] getEncryptedDigest() {
return encryptedDigest;
}
public PKCS9Attributes getUnauthenticatedAttributes() {
return unauthenticatedAttributes;
}
/**
* Returns the timestamp PKCS7 data unverified.
* @return a PKCS7 object
*/
public PKCS7 getTsToken() throws IOException {
if (unauthenticatedAttributes == null) {
return null;
}
PKCS9Attribute tsTokenAttr =
unauthenticatedAttributes.getAttribute(
PKCS9Attribute.SIGNATURE_TIMESTAMP_TOKEN_OID);
if (tsTokenAttr == null) {
return null;
}
return new PKCS7((byte[])tsTokenAttr.getValue());
}
/*
* Extracts a timestamp from a PKCS7 SignerInfo.
*
* Examines the signer's unsigned attributes for a
* {@code signatureTimestampToken} attribute. If present,
* then it is parsed to extract the date and time at which the
* timestamp was generated.
*
* @param info A signer information element of a PKCS 7 block.
*
* @return A timestamp token or null if none is present.
* @throws IOException if an error is encountered while parsing the
* PKCS7 data.
* @throws NoSuchAlgorithmException if an error is encountered while
* verifying the PKCS7 object.
* @throws SignatureException if an error is encountered while
* verifying the PKCS7 object.
* @throws CertificateException if an error is encountered while generating
* the TSA's certpath.
*/
public Timestamp getTimestamp()
throws IOException, NoSuchAlgorithmException, SignatureException,
CertificateException
{
if (timestamp != null || !hasTimestamp)
return timestamp;
PKCS7 tsToken = getTsToken();
if (tsToken == null) {
hasTimestamp = false;
return null;
}
// Extract the content (an encoded timestamp token info)
byte[] encTsTokenInfo = tsToken.getContentInfo().getData();
// Extract the signer (the Timestamping Authority)
// while verifying the content
SignerInfo[] tsa = tsToken.verify(encTsTokenInfo);
if (tsa == null || tsa.length == 0) {
throw new SignatureException("Unable to verify timestamp");
}
// Expect only one signer
ArrayList chain = tsa[0].getCertificateChain(tsToken);
CertificateFactory cf = PKIXInsts.getCertificateFactory("X.509");
CertPath tsaChain = cf.generateCertPath(chain);
// Create a timestamp token info object
TimestampToken tsTokenInfo = new TimestampToken(encTsTokenInfo);
// Check that the signature timestamp applies to this signature
verifyTimestamp(tsTokenInfo);
algorithms.putAll(tsa[0].algorithms);
// Create a timestamp object
timestamp = new Timestamp(tsTokenInfo.getDate(), tsaChain);
return timestamp;
}
/*
* Check that the signature timestamp applies to this signature.
* Match the hash present in the signature timestamp token against the hash
* of this signature.
*/
private void verifyTimestamp(TimestampToken token)
throws NoSuchAlgorithmException, SignatureException {
AlgorithmId digestAlgId = token.getHashAlgorithm();
algorithms.put(digestAlgId,
new AlgorithmInfo("TimestampToken digestAlgorithm field", false));
MessageDigest md = CryptoInsts.getMessageDigest(digestAlgId.getName());
if (!MessageDigest.isEqual(token.getHashedMessage(),
md.digest(encryptedDigest))) {
throw new SignatureException("Signature timestamp (#" +
Debug.toString(token.getSerialNumber()) +
") generated on " + token.getDate() + " is inapplicable");
}
if (debug != null) {
debug.println();
debug.println("Detected signature timestamp (#" +
Debug.toString(token.getSerialNumber()) +
") generated on " + token.getDate());
debug.println();
}
}
public String toString() {
HexDumpEncoder hexDump = new HexDumpEncoder();
String out = "";
out += "Signer Info for (issuer): " + issuerName + "\n";
out += "\tversion: " + Debug.toHexString(version) + "\n";
out += "\tcertificateSerialNumber: " +
Debug.toHexString(certificateSerialNumber) + "\n";
out += "\tdigestAlgorithmId: " + digestAlgorithmId + "\n";
if (authenticatedAttributes != null) {
out += "\tauthenticatedAttributes: " + authenticatedAttributes +
"\n";
}
out += "\tdigestEncryptionAlgorithmId: " + digestEncryptionAlgorithmId +
"\n";
out += "\tencryptedDigest: " + "\n" +
hexDump.encodeBuffer(encryptedDigest) + "\n";
if (unauthenticatedAttributes != null) {
out += "\tunauthenticatedAttributes: " +
unauthenticatedAttributes + "\n";
}
return out;
}
// sun.security.util.SignatureFileVerifier invokes this method
// from sun.security.pkcs.SignerInfo, but not here.
// /**
// * Verify all the algorithms in the array of SignerInfos against the
// * constraints in the jdk.jar.disabledAlgorithms security property.
// *
// * @param infos array of SignerInfos
// * @param params constraint parameters
// * @param name the name of the signer's PKCS7 file
// * @return a set of algorithms that passed the checks and are not disabled
// */
// public static Set verifyAlgorithms(SignerInfo[] infos,
// JarConstraintsParameters params, String name) throws SignatureException {
// Map algorithms = new HashMap<>();
// for (SignerInfo info : infos) {
// algorithms.putAll(info.algorithms);
// }
//
// Set enabledAlgorithms = new HashSet<>();
// try {
// for (Map.Entry algEntry
// : algorithms.entrySet()) {
// AlgorithmInfo info = algEntry.getValue();
// params.setExtendedExceptionMsg(name, info.field);
// AlgorithmId algId = algEntry.getKey();
// JAR_DISABLED_CHECK.permits(algId.getName(),
// algId.getParameters(), params, info.checkKey);
// enabledAlgorithms.add(algId.getName());
// }
// } catch (CertPathValidatorException e) {
// throw new SignatureException(e);
// }
// return enabledAlgorithms;
// }
}