private DERObject getSingleValuedSignedAttribute(
DERObjectIdentifier attrOID, String printableName) throws CMSException {
AttributeTable unsignedAttrTable = this.getUnsignedAttributes();
if (unsignedAttrTable != null && unsignedAttrTable.getAll(attrOID).size() > 0) {
throw new CMSException(
"The " + printableName + " attribute MUST NOT be an unsigned attribute");
}
AttributeTable signedAttrTable = this.getSignedAttributes();
if (signedAttrTable == null) {
return null;
}
ASN1EncodableVector v = signedAttrTable.getAll(attrOID);
switch (v.size()) {
case 0:
return null;
case 1:
{
Attribute t = (Attribute) v.get(0);
ASN1Set attrValues = t.getAttrValues();
if (attrValues.size() != 1) {
throw new CMSException(
"A " + printableName + " attribute MUST have a single attribute value");
}
return attrValues.getObjectAt(0).getDERObject();
}
default:
throw new CMSException(
"The SignedAttributes in a signerInfo MUST NOT include multiple instances of the "
+ printableName
+ " attribute");
}
}
private Date findTimestamp(CMSSignedData cmsSignedData) {
Iterator iterator = cmsSignedData.getSignerInfos().getSigners().iterator();
while (iterator.hasNext()) {
SignerInformation signerInformation = (SignerInformation) iterator.next();
AttributeTable signedAttrTable = signerInformation.getSignedAttributes();
if (signedAttrTable == null) {
continue;
}
ASN1EncodableVector v = signedAttrTable.getAll(CMSAttributes.signingTime);
switch (v.size()) {
case 0:
continue;
case 1:
Attribute t = (Attribute) v.get(0);
ASN1Set attrValues = t.getAttrValues();
if (attrValues.size() != 1) {
continue;
}
// found it
try {
return ((ASN1UTCTime) attrValues.getObjectAt(0).getDERObject()).getDate();
} catch (ParseException e) {
e.printStackTrace();
}
continue;
default:
continue;
}
}
// no timestamp found
return null;
}
/** @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);
}
}
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);
}
}
/**
* Return a SignerInformationStore containing the counter signatures attached to this signer. If
* no counter signatures are present an empty store is returned.
*/
public SignerInformationStore getCounterSignatures() {
// TODO There are several checks implied by the RFC3852 comments that are missing
/*
The countersignature attribute MUST be an unsigned attribute; it MUST
NOT be a signed attribute, an authenticated attribute, an
unauthenticated attribute, or an unprotected attribute.
*/
AttributeTable unsignedAttributeTable = getUnsignedAttributes();
if (unsignedAttributeTable == null) {
return new SignerInformationStore(new ArrayList(0));
}
List counterSignatures = new ArrayList();
/*
The UnsignedAttributes syntax is defined as a SET OF Attributes. The
UnsignedAttributes in a signerInfo may include multiple instances of
the countersignature attribute.
*/
ASN1EncodableVector allCSAttrs = unsignedAttributeTable.getAll(CMSAttributes.counterSignature);
for (int i = 0; i < allCSAttrs.size(); ++i) {
Attribute counterSignatureAttribute = (Attribute) allCSAttrs.get(i);
/*
A countersignature attribute can have multiple attribute values. The
syntax is defined as a SET OF AttributeValue, and there MUST be one
or more instances of AttributeValue present.
*/
ASN1Set values = counterSignatureAttribute.getAttrValues();
if (values.size() < 1) {
// TODO Throw an appropriate exception?
}
for (Enumeration en = values.getObjects(); en.hasMoreElements(); ) {
/*
Countersignature values have the same meaning as SignerInfo values
for ordinary signatures, except that:
1. The signedAttributes field MUST NOT contain a content-type
attribute; there is no content type for countersignatures.
2. The signedAttributes field MUST contain a message-digest
attribute if it contains any other attributes.
3. The input to the message-digesting process is the contents
octets of the DER encoding of the signatureValue field of the
SignerInfo value with which the attribute is associated.
*/
SignerInfo si = SignerInfo.getInstance(en.nextElement());
String digestName =
CMSSignedHelper.INSTANCE.getDigestAlgName(
si.getDigestAlgorithm().getObjectId().getId());
counterSignatures.add(
new SignerInformation(
si,
null,
null,
new CounterSignatureDigestCalculator(digestName, null, getSignature()),
new DefaultSignatureAlgorithmIdentifierFinder()));
}
}
return new SignerInformationStore(counterSignatures);
}