SignerInformation(
SignerInfo info,
ASN1ObjectIdentifier contentType,
CMSProcessable content,
IntDigestCalculator digestCalculator,
SignatureAlgorithmIdentifierFinder sigAlgFinder) {
this.info = info;
this.contentType = contentType;
this.sigAlgFinder = sigAlgFinder;
this.isCounterSignature = contentType == null;
SignerIdentifier s = info.getSID();
if (s.isTagged()) {
ASN1OctetString octs = ASN1OctetString.getInstance(s.getId());
sid = new SignerId(octs.getOctets());
} else {
IssuerAndSerialNumber iAnds = IssuerAndSerialNumber.getInstance(s.getId());
sid = new SignerId(iAnds.getName(), iAnds.getSerialNumber().getValue());
}
this.digestAlgorithm = info.getDigestAlgorithm();
this.signedAttributeSet = info.getAuthenticatedAttributes();
this.unsignedAttributeSet = info.getUnauthenticatedAttributes();
this.encryptionAlgorithm = info.getDigestEncryptionAlgorithm();
this.signature = info.getEncryptedDigest().getOctets();
this.content = content;
this.digestCalculator = digestCalculator;
}
/** Tests the extension Freshest CRL DP. */
@Test
public void testCRLFreshestCRL() throws Exception {
final String cdpURL = "http://www.ejbca.org/foo/bar.crl";
final String freshestCdpURL = "http://www.ejbca.org/foo/delta.crl";
X509CAInfo cainfo = (X509CAInfo) testx509ca.getCAInfo();
X509CRL x509crl;
byte[] cFreshestDpDER;
cainfo.setUseCrlDistributionPointOnCrl(true);
cainfo.setDefaultCRLDistPoint(cdpURL);
cainfo.setCADefinedFreshestCRL(freshestCdpURL);
caSession.editCA(roleMgmgToken, cainfo);
publishingCrlSessionRemote.forceCRL(roleMgmgToken, testx509ca.getCAId());
x509crl =
CertTools.getCRLfromByteArray(crlStoreSession.getLastCRL(cainfo.getSubjectDN(), false));
cFreshestDpDER = x509crl.getExtensionValue(Extension.freshestCRL.getId());
assertNotNull("CRL has no Freshest Distribution Point", cFreshestDpDER);
ASN1InputStream aIn = new ASN1InputStream(new ByteArrayInputStream(cFreshestDpDER));
ASN1OctetString octs = (ASN1OctetString) aIn.readObject();
aIn = new ASN1InputStream(new ByteArrayInputStream(octs.getOctets()));
CRLDistPoint cdp = CRLDistPoint.getInstance((ASN1Sequence) aIn.readObject());
DistributionPoint[] distpoints = cdp.getDistributionPoints();
assertEquals("More CRL Freshest distributions points than expected", 1, distpoints.length);
assertEquals(
"Freshest CRL distribution point is different",
freshestCdpURL,
((DERIA5String)
((GeneralNames) distpoints[0].getDistributionPoint().getName())
.getNames()[0].getName())
.getString());
}
public byte[] getIV() {
if (iv != null) {
return iv.getOctets();
} else {
return null;
}
}
private static ASN1Primitive getObject(String oid, byte[] ext) throws AnnotatedException {
try {
ASN1InputStream aIn = new ASN1InputStream(ext);
ASN1OctetString octs = (ASN1OctetString) aIn.readObject();
aIn = new ASN1InputStream(octs.getOctets());
return aIn.readObject();
} catch (Exception e) {
throw new AnnotatedException("exception processing extension " + oid, e);
}
}
/** Return an Extension ASN1Primitive from a CRL */
protected static ASN1Primitive getExtensionValue(X509CRL crl, String oid) throws IOException {
if (crl == null) {
return null;
}
byte[] bytes = crl.getExtensionValue(oid);
if (bytes == null) {
return null;
}
ASN1InputStream aIn = new ASN1InputStream(new ByteArrayInputStream(bytes));
ASN1OctetString octs = (ASN1OctetString) aIn.readObject();
aIn = new ASN1InputStream(new ByteArrayInputStream(octs.getOctets()));
return aIn.readObject();
} // getExtensionValue
private byte[] getSubjectKeyId(X509Certificate cert) throws IOException {
byte[] extvalue = cert.getExtensionValue(X509Extensions.SubjectKeyIdentifier.getId());
if (extvalue == null) {
return null;
}
ASN1OctetString str =
ASN1OctetString.getInstance(
new ASN1InputStream(new ByteArrayInputStream(extvalue)).readObject());
SubjectKeyIdentifier keyId =
SubjectKeyIdentifier.getInstance(
new ASN1InputStream(new ByteArrayInputStream(str.getOctets())).readObject());
return keyId.getKeyIdentifier();
}
private static boolean certHasPolicy(X509Certificate cert, String sOid) {
try {
if (m_logger.isDebugEnabled())
m_logger.debug("Read cert policies: " + cert.getSerialNumber().toString());
ByteArrayInputStream bIn = new ByteArrayInputStream(cert.getEncoded());
ASN1InputStream aIn = new ASN1InputStream(bIn);
ASN1Sequence seq = (ASN1Sequence) aIn.readObject();
X509CertificateStructure obj = new X509CertificateStructure(seq);
TBSCertificateStructure tbsCert = obj.getTBSCertificate();
if (tbsCert.getVersion() == 3) {
X509Extensions ext = tbsCert.getExtensions();
if (ext != null) {
Enumeration en = ext.oids();
while (en.hasMoreElements()) {
DERObjectIdentifier oid = (DERObjectIdentifier) en.nextElement();
X509Extension extVal = ext.getExtension(oid);
ASN1OctetString oct = extVal.getValue();
ASN1InputStream extIn = new ASN1InputStream(new ByteArrayInputStream(oct.getOctets()));
// if (oid.equals(X509Extensions.CertificatePolicies)) { // bc 146 ja jdk 1.6 puhul -
// X509Extension.certificatePolicies
if (oid.equals(X509Extension.certificatePolicies)) { // bc 146 ja jdk 1.6 puhul -
// X509Extension.certificatePolicies
ASN1Sequence cp = (ASN1Sequence) extIn.readObject();
for (int i = 0; i != cp.size(); i++) {
PolicyInformation pol = PolicyInformation.getInstance(cp.getObjectAt(i));
DERObjectIdentifier dOid = pol.getPolicyIdentifier();
String soid2 = dOid.getId();
if (m_logger.isDebugEnabled()) m_logger.debug("Policy: " + soid2);
if (soid2.startsWith(sOid)) return true;
}
}
}
}
}
} catch (Exception ex) {
m_logger.error("Error reading cert policies: " + ex);
}
return false;
}
/**
* @return a list of URLs in String format with present freshest CRL extensions or an empty List
*/
public static List<String> extractFreshestCrlDistributionPoints(final X509CRL crl) {
final List<String> freshestCdpUrls = new ArrayList<String>();
final byte[] extensionValue = crl.getExtensionValue(Extension.freshestCRL.getId());
if (extensionValue != null) {
final ASN1OctetString asn1OctetString =
getAsn1ObjectFromBytes(extensionValue, ASN1OctetString.class);
if (asn1OctetString != null) {
final ASN1Sequence asn1Sequence =
getAsn1ObjectFromBytes(asn1OctetString.getOctets(), ASN1Sequence.class);
if (asn1Sequence != null) {
final CRLDistPoint cdp = CRLDistPoint.getInstance(asn1Sequence);
for (final DistributionPoint distributionPoint : cdp.getDistributionPoints()) {
freshestCdpUrls.add(
((DERIA5String)
((GeneralNames) distributionPoint.getDistributionPoint().getName())
.getNames()[0].getName())
.getString());
}
}
}
}
return freshestCdpUrls;
}
public static String toString(final ASN1OctetString value) {
return new String(value.getOctets());
}
@Override
protected void onDocumentSigned(byte[] byteArray) {
try {
InputStream inputStream = new ByteArrayInputStream(byteArray);
PDDocument document = PDDocument.load(inputStream);
List<PDSignature> signatures = document.getSignatureDictionaries();
assertEquals(1, signatures.size());
for (PDSignature pdSignature : signatures) {
byte[] contents = pdSignature.getContents(byteArray);
byte[] signedContent = pdSignature.getSignedContent(byteArray);
logger.info("Byte range : " + Arrays.toString(pdSignature.getByteRange()));
// IOUtils.write(contents, new FileOutputStream("sig.p7s"));
ASN1InputStream asn1sInput = new ASN1InputStream(contents);
ASN1Sequence asn1Seq = (ASN1Sequence) asn1sInput.readObject();
logger.info("SEQ : " + asn1Seq.toString());
ASN1ObjectIdentifier oid = ASN1ObjectIdentifier.getInstance(asn1Seq.getObjectAt(0));
assertEquals(PKCSObjectIdentifiers.signedData, oid);
SignedData signedData =
SignedData.getInstance(DERTaggedObject.getInstance(asn1Seq.getObjectAt(1)).getObject());
ASN1Set digestAlgorithmSet = signedData.getDigestAlgorithms();
ASN1ObjectIdentifier oidDigestAlgo =
ASN1ObjectIdentifier.getInstance(
ASN1Sequence.getInstance(digestAlgorithmSet.getObjectAt(0)).getObjectAt(0));
DigestAlgorithm digestAlgorithm = DigestAlgorithm.forOID(oidDigestAlgo.getId());
logger.info("DIGEST ALGO : " + digestAlgorithm);
ContentInfo encapContentInfo = signedData.getEncapContentInfo();
ASN1ObjectIdentifier contentTypeOID = encapContentInfo.getContentType();
logger.info("ENCAPSULATED CONTENT INFO TYPE : " + contentTypeOID);
assertEquals(PKCSObjectIdentifiers.data, contentTypeOID);
ASN1Encodable content = encapContentInfo.getContent();
logger.info("ENCAPSULATED CONTENT INFO CONTENT : " + content);
assertNull(content);
List<X509Certificate> certificates = extractCertificates(signedData);
ASN1Set signerInfosAsn1 = signedData.getSignerInfos();
logger.info("SIGNER INFO ASN1 : " + signerInfosAsn1.toString());
SignerInfo signedInfo =
SignerInfo.getInstance(ASN1Sequence.getInstance(signerInfosAsn1.getObjectAt(0)));
ASN1Set authenticatedAttributeSet = signedInfo.getAuthenticatedAttributes();
logger.info("AUTHENTICATED ATTR : " + authenticatedAttributeSet);
List<ASN1ObjectIdentifier> attributeOids = new ArrayList<ASN1ObjectIdentifier>();
for (int i = 0; i < authenticatedAttributeSet.size(); i++) {
Attribute attribute = Attribute.getInstance(authenticatedAttributeSet.getObjectAt(i));
attributeOids.add(attribute.getAttrType());
}
logger.info("List of OID for Auth Attrb : " + attributeOids);
Attribute attributeDigest = Attribute.getInstance(authenticatedAttributeSet.getObjectAt(1));
assertEquals(PKCSObjectIdentifiers.pkcs_9_at_messageDigest, attributeDigest.getAttrType());
ASN1OctetString asn1ObjString =
ASN1OctetString.getInstance(attributeDigest.getAttrValues().getObjectAt(0));
String embeddedDigest = Base64.encode(asn1ObjString.getOctets());
logger.info("MESSAGE DIGEST : " + embeddedDigest);
byte[] digestSignedContent = DSSUtils.digest(digestAlgorithm, signedContent);
String computedDigestSignedContentEncodeBase64 = Base64.encode(digestSignedContent);
logger.info(
"COMPUTED DIGEST SIGNED CONTENT BASE64 : " + computedDigestSignedContentEncodeBase64);
assertEquals(embeddedDigest, computedDigestSignedContentEncodeBase64);
SignerIdentifier sid = signedInfo.getSID();
logger.info("SIGNER IDENTIFIER : " + sid.getId());
IssuerAndSerialNumber issuerAndSerialNumber =
IssuerAndSerialNumber.getInstance(signedInfo.getSID());
ASN1Integer signerSerialNumber = issuerAndSerialNumber.getSerialNumber();
logger.info(
"ISSUER AND SN : " + issuerAndSerialNumber.getName() + " " + signerSerialNumber);
BigInteger serial = issuerAndSerialNumber.getSerialNumber().getValue();
X509Certificate signerCertificate = null;
for (X509Certificate x509Certificate : certificates) {
if (serial.equals(x509Certificate.getSerialNumber())) {
signerCertificate = x509Certificate;
}
}
assertNotNull(signerCertificate);
String algorithm = signerCertificate.getPublicKey().getAlgorithm();
EncryptionAlgorithm encryptionAlgorithm = EncryptionAlgorithm.forName(algorithm);
ASN1OctetString encryptedInfoOctedString = signedInfo.getEncryptedDigest();
String signatureValue = Hex.toHexString(encryptedInfoOctedString.getOctets());
logger.info("SIGNATURE VALUE : " + signatureValue);
Cipher cipher = Cipher.getInstance(encryptionAlgorithm.getName());
cipher.init(Cipher.DECRYPT_MODE, signerCertificate);
byte[] decrypted = cipher.doFinal(encryptedInfoOctedString.getOctets());
ASN1InputStream inputDecrypted = new ASN1InputStream(decrypted);
ASN1Sequence seqDecrypt = (ASN1Sequence) inputDecrypted.readObject();
logger.info("DECRYPTED : " + seqDecrypt);
DigestInfo digestInfo = new DigestInfo(seqDecrypt);
assertEquals(oidDigestAlgo, digestInfo.getAlgorithmId().getAlgorithm());
String decryptedDigestEncodeBase64 = Base64.encode(digestInfo.getDigest());
logger.info("DECRYPTED BASE64 : " + decryptedDigestEncodeBase64);
byte[] encoded = authenticatedAttributeSet.getEncoded();
byte[] digest = DSSUtils.digest(digestAlgorithm, encoded);
String computedDigestFromSignatureEncodeBase64 = Base64.encode(digest);
logger.info(
"COMPUTED DIGEST FROM SIGNATURE BASE64 : " + computedDigestFromSignatureEncodeBase64);
assertEquals(decryptedDigestEncodeBase64, computedDigestFromSignatureEncodeBase64);
IOUtils.closeQuietly(inputDecrypted);
IOUtils.closeQuietly(asn1sInput);
}
IOUtils.closeQuietly(inputStream);
document.close();
} catch (Exception e) {
logger.error(e.getMessage(), e);
fail(e.getMessage());
}
}
private boolean doVerify(SignerInformationVerifier verifier) throws CMSException {
String digestName = CMSSignedHelper.INSTANCE.getDigestAlgName(this.getDigestAlgOID());
String encName = CMSSignedHelper.INSTANCE.getEncryptionAlgName(this.getEncryptionAlgOID());
String signatureName = digestName + "with" + encName;
try {
if (digestCalculator != null) {
resultDigest = digestCalculator.getDigest();
} else {
DigestCalculator calc = verifier.getDigestCalculator(this.getDigestAlgorithmID());
if (content != null) {
OutputStream digOut = calc.getOutputStream();
content.write(digOut);
digOut.close();
} else if (signedAttributeSet == null) {
// TODO Get rid of this exception and just treat content==null as empty not missing?
throw new CMSException("data not encapsulated in signature - use detached constructor.");
}
resultDigest = calc.getDigest();
}
} catch (IOException e) {
throw new CMSException("can't process mime object to create signature.", e);
} catch (NoSuchAlgorithmException e) {
throw new CMSException("can't find algorithm: " + e.getMessage(), e);
} catch (OperatorCreationException e) {
throw new CMSException("can't create digest calculator: " + e.getMessage(), e);
}
// RFC 3852 11.1 Check the content-type attribute is correct
{
DERObject validContentType =
getSingleValuedSignedAttribute(CMSAttributes.contentType, "content-type");
if (validContentType == null) {
if (!isCounterSignature && signedAttributeSet != null) {
throw new CMSException(
"The content-type attribute type MUST be present whenever signed attributes are present in signed-data");
}
} else {
if (isCounterSignature) {
throw new CMSException(
"[For counter signatures,] the signedAttributes field MUST NOT contain a content-type attribute");
}
if (!(validContentType instanceof DERObjectIdentifier)) {
throw new CMSException(
"content-type attribute value not of ASN.1 type 'OBJECT IDENTIFIER'");
}
DERObjectIdentifier signedContentType = (DERObjectIdentifier) validContentType;
if (!signedContentType.equals(contentType)) {
throw new CMSException("content-type attribute value does not match eContentType");
}
}
}
// RFC 3852 11.2 Check the message-digest attribute is correct
{
DERObject validMessageDigest =
getSingleValuedSignedAttribute(CMSAttributes.messageDigest, "message-digest");
if (validMessageDigest == null) {
if (signedAttributeSet != null) {
throw new CMSException(
"the message-digest signed attribute type MUST be present when there are any signed attributes present");
}
} else {
if (!(validMessageDigest instanceof ASN1OctetString)) {
throw new CMSException("message-digest attribute value not of ASN.1 type 'OCTET STRING'");
}
ASN1OctetString signedMessageDigest = (ASN1OctetString) validMessageDigest;
if (!Arrays.constantTimeAreEqual(resultDigest, signedMessageDigest.getOctets())) {
throw new CMSSignerDigestMismatchException(
"message-digest attribute value does not match calculated value");
}
}
}
// RFC 3852 11.4 Validate countersignature attribute(s)
{
AttributeTable signedAttrTable = this.getSignedAttributes();
if (signedAttrTable != null
&& signedAttrTable.getAll(CMSAttributes.counterSignature).size() > 0) {
throw new CMSException("A countersignature attribute MUST NOT be a signed attribute");
}
AttributeTable unsignedAttrTable = this.getUnsignedAttributes();
if (unsignedAttrTable != null) {
ASN1EncodableVector csAttrs = unsignedAttrTable.getAll(CMSAttributes.counterSignature);
for (int i = 0; i < csAttrs.size(); ++i) {
Attribute csAttr = (Attribute) csAttrs.get(i);
if (csAttr.getAttrValues().size() < 1) {
throw new CMSException(
"A countersignature attribute MUST contain at least one AttributeValue");
}
// Note: We don't recursively validate the countersignature value
}
}
}
try {
ContentVerifier contentVerifier =
verifier.getContentVerifier(sigAlgFinder.find(signatureName));
OutputStream sigOut = contentVerifier.getOutputStream();
if (signedAttributeSet == null) {
if (digestCalculator != null) {
if (contentVerifier instanceof RawContentVerifier) {
RawContentVerifier rawVerifier = (RawContentVerifier) contentVerifier;
if (encName.equals("RSA")) {
DigestInfo digInfo = new DigestInfo(digestAlgorithm, resultDigest);
return rawVerifier.verify(digInfo.getDEREncoded(), this.getSignature());
}
return rawVerifier.verify(resultDigest, this.getSignature());
}
throw new CMSException("verifier unable to process raw signature");
} else if (content != null) {
// TODO Use raw signature of the hash value instead
content.write(sigOut);
}
} else {
sigOut.write(this.getEncodedSignedAttributes());
}
sigOut.close();
return contentVerifier.verify(this.getSignature());
} catch (IOException e) {
throw new CMSException("can't process mime object to create signature.", e);
} catch (OperatorCreationException e) {
throw new CMSException("can't create content verifier: " + e.getMessage(), e);
}
}
/** @deprecated */
private boolean doVerify(PublicKey key, Provider sigProvider)
throws CMSException, NoSuchAlgorithmException {
String digestName = CMSSignedHelper.INSTANCE.getDigestAlgName(this.getDigestAlgOID());
String encName = CMSSignedHelper.INSTANCE.getEncryptionAlgName(this.getEncryptionAlgOID());
String signatureName = digestName + "with" + encName;
Signature sig = CMSSignedHelper.INSTANCE.getSignatureInstance(signatureName, sigProvider);
MessageDigest digest = CMSSignedHelper.INSTANCE.getDigestInstance(digestName, sigProvider);
// TODO [BJA-109] Note: PSSParameterSpec requires JDK1.4+
/*
try
{
DERObjectIdentifier sigAlgOID = encryptionAlgorithm.getObjectId();
DEREncodable sigParams = this.encryptionAlgorithm.getParameters();
if (sigAlgOID.equals(PKCSObjectIdentifiers.id_RSASSA_PSS))
{
// RFC 4056
// When the id-RSASSA-PSS algorithm identifier is used for a signature,
// the AlgorithmIdentifier parameters field MUST contain RSASSA-PSS-params.
if (sigParams == null)
{
throw new CMSException(
"RSASSA-PSS signature must specify algorithm parameters");
}
AlgorithmParameters params = AlgorithmParameters.getInstance(
sigAlgOID.getId(), sig.getProvider().getName());
params.init(sigParams.getDERObject().getEncoded(), "ASN.1");
PSSParameterSpec spec = (PSSParameterSpec)params.getParameterSpec(PSSParameterSpec.class);
sig.setParameter(spec);
}
else
{
// TODO Are there other signature algorithms that provide parameters?
if (sigParams != null)
{
throw new CMSException("unrecognised signature parameters provided");
}
}
}
catch (IOException e)
{
throw new CMSException("error encoding signature parameters.", e);
}
catch (InvalidAlgorithmParameterException e)
{
throw new CMSException("error setting signature parameters.", e);
}
catch (InvalidParameterSpecException e)
{
throw new CMSException("error processing signature parameters.", e);
}
*/
try {
if (digestCalculator != null) {
resultDigest = digestCalculator.getDigest();
} else {
if (content != null) {
content.write(new DigOutputStream(digest));
} else if (signedAttributeSet == null) {
// TODO Get rid of this exception and just treat content==null as empty not missing?
throw new CMSException("data not encapsulated in signature - use detached constructor.");
}
resultDigest = digest.digest();
}
} catch (IOException e) {
throw new CMSException("can't process mime object to create signature.", e);
}
// RFC 3852 11.1 Check the content-type attribute is correct
{
DERObject validContentType =
getSingleValuedSignedAttribute(CMSAttributes.contentType, "content-type");
if (validContentType == null) {
if (!isCounterSignature && signedAttributeSet != null) {
throw new CMSException(
"The content-type attribute type MUST be present whenever signed attributes are present in signed-data");
}
} else {
if (isCounterSignature) {
throw new CMSException(
"[For counter signatures,] the signedAttributes field MUST NOT contain a content-type attribute");
}
if (!(validContentType instanceof DERObjectIdentifier)) {
throw new CMSException(
"content-type attribute value not of ASN.1 type 'OBJECT IDENTIFIER'");
}
DERObjectIdentifier signedContentType = (DERObjectIdentifier) validContentType;
if (!signedContentType.equals(contentType)) {
throw new CMSException("content-type attribute value does not match eContentType");
}
}
}
// RFC 3852 11.2 Check the message-digest attribute is correct
{
DERObject validMessageDigest =
getSingleValuedSignedAttribute(CMSAttributes.messageDigest, "message-digest");
if (validMessageDigest == null) {
if (signedAttributeSet != null) {
throw new CMSException(
"the message-digest signed attribute type MUST be present when there are any signed attributes present");
}
} else {
if (!(validMessageDigest instanceof ASN1OctetString)) {
throw new CMSException("message-digest attribute value not of ASN.1 type 'OCTET STRING'");
}
ASN1OctetString signedMessageDigest = (ASN1OctetString) validMessageDigest;
if (!Arrays.constantTimeAreEqual(resultDigest, signedMessageDigest.getOctets())) {
throw new CMSSignerDigestMismatchException(
"message-digest attribute value does not match calculated value");
}
}
}
// RFC 3852 11.4 Validate countersignature attribute(s)
{
AttributeTable signedAttrTable = this.getSignedAttributes();
if (signedAttrTable != null
&& signedAttrTable.getAll(CMSAttributes.counterSignature).size() > 0) {
throw new CMSException("A countersignature attribute MUST NOT be a signed attribute");
}
AttributeTable unsignedAttrTable = this.getUnsignedAttributes();
if (unsignedAttrTable != null) {
ASN1EncodableVector csAttrs = unsignedAttrTable.getAll(CMSAttributes.counterSignature);
for (int i = 0; i < csAttrs.size(); ++i) {
Attribute csAttr = (Attribute) csAttrs.get(i);
if (csAttr.getAttrValues().size() < 1) {
throw new CMSException(
"A countersignature attribute MUST contain at least one AttributeValue");
}
// Note: We don't recursively validate the countersignature value
}
}
}
try {
sig.initVerify(key);
if (signedAttributeSet == null) {
if (digestCalculator != null) {
// need to decrypt signature and check message bytes
return verifyDigest(resultDigest, key, this.getSignature(), sigProvider);
} else if (content != null) {
// TODO Use raw signature of the hash value instead
content.write(new SigOutputStream(sig));
}
} else {
sig.update(this.getEncodedSignedAttributes());
}
return sig.verify(this.getSignature());
} catch (InvalidKeyException e) {
throw new CMSException("key not appropriate to signature in message.", e);
} catch (IOException e) {
throw new CMSException("can't process mime object to create signature.", e);
} catch (SignatureException e) {
throw new CMSException("invalid signature format in message: " + e.getMessage(), e);
}
}