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package org.bouncycastle.cms;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.DERSet;
import org.bouncycastle.asn1.cms.Attribute;
import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.cms.CMSAlgorithmProtection;
import org.bouncycastle.asn1.cms.CMSAttributes;
import org.bouncycastle.asn1.cms.IssuerAndSerialNumber;
import org.bouncycastle.asn1.cms.SignerIdentifier;
import org.bouncycastle.asn1.cms.SignerInfo;
import org.bouncycastle.asn1.cms.Time;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.DigestInfo;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.operator.ContentVerifier;
import org.bouncycastle.operator.DigestCalculator;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.RawContentVerifier;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.io.TeeOutputStream;
/**
* an expanded SignerInfo block from a CMS Signed message
*/
public class SignerInformation
{
private final SignerId sid;
private final CMSProcessable content;
private final byte[] signature;
private final ASN1ObjectIdentifier contentType;
private final boolean isCounterSignature;
// Derived
private AttributeTable signedAttributeValues;
private AttributeTable unsignedAttributeValues;
private byte[] resultDigest;
protected final SignerInfo info;
protected final AlgorithmIdentifier digestAlgorithm;
protected final AlgorithmIdentifier encryptionAlgorithm;
protected final ASN1Set signedAttributeSet;
protected final ASN1Set unsignedAttributeSet;
SignerInformation(
SignerInfo info,
ASN1ObjectIdentifier contentType,
CMSProcessable content,
byte[] resultDigest)
{
this.info = info;
this.contentType = contentType;
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.resultDigest = resultDigest;
}
/**
* Protected constructor. In some cases clients have their own idea about how to encode
* the signed attributes and calculate the signature. This constructor is to allow developers
* to deal with that by extending off the class and overriding methods like getSignedAttributes().
*
* @param baseInfo the SignerInformation to base this one on.
*/
protected SignerInformation(SignerInformation baseInfo)
{
this(baseInfo, baseInfo.info);
}
/**
* Protected constructor. In some cases clients also have their own ideas about what
* goes in various SignerInfo fields. This constructor is to allow developers to deal with
* that by also tweaking the SignerInfo so that these issues can be dealt with.
*
* @param baseInfo the SignerInformation to base this one on.
* @param info the SignerInfo to associate with the existing baseInfo data.
*/
protected SignerInformation(SignerInformation baseInfo, SignerInfo info)
{
this.info = info;
this.contentType = baseInfo.contentType;
this.isCounterSignature = baseInfo.isCounterSignature();
this.sid = baseInfo.getSID();
this.digestAlgorithm = info.getDigestAlgorithm();
this.signedAttributeSet = info.getAuthenticatedAttributes();
this.unsignedAttributeSet = info.getUnauthenticatedAttributes();
this.encryptionAlgorithm = info.getDigestEncryptionAlgorithm();
this.signature = info.getEncryptedDigest().getOctets();
this.content = baseInfo.content;
this.resultDigest = baseInfo.resultDigest;
this.signedAttributeValues = getSignedAttributes();
this.unsignedAttributeValues = getUnsignedAttributes();
}
public boolean isCounterSignature()
{
return isCounterSignature;
}
public ASN1ObjectIdentifier getContentType()
{
return this.contentType;
}
private byte[] encodeObj(
ASN1Encodable obj)
throws IOException
{
if (obj != null)
{
return obj.toASN1Primitive().getEncoded();
}
return null;
}
public SignerId getSID()
{
return sid;
}
/**
* return the version number for this objects underlying SignerInfo structure.
*/
public int getVersion()
{
return info.getVersion().intValueExact();
}
public AlgorithmIdentifier getDigestAlgorithmID()
{
return digestAlgorithm;
}
/**
* return the object identifier for the signature.
*/
public String getDigestAlgOID()
{
return digestAlgorithm.getAlgorithm().getId();
}
/**
* return the signature parameters, or null if there aren't any.
*/
public byte[] getDigestAlgParams()
{
try
{
return encodeObj(digestAlgorithm.getParameters());
}
catch (Exception e)
{
throw new RuntimeException("exception getting digest parameters " + e);
}
}
/**
* return the content digest that was calculated during verification.
*/
public byte[] getContentDigest()
{
if (resultDigest == null)
{
throw new IllegalStateException("method can only be called after verify.");
}
return Arrays.clone(resultDigest);
}
/**
* return the object identifier for the signature.
*/
public String getEncryptionAlgOID()
{
return encryptionAlgorithm.getAlgorithm().getId();
}
/**
* return the signature/encryption algorithm parameters, or null if
* there aren't any.
*/
public byte[] getEncryptionAlgParams()
{
try
{
return encodeObj(encryptionAlgorithm.getParameters());
}
catch (Exception e)
{
throw new RuntimeException("exception getting encryption parameters " + e);
}
}
/**
* return a table of the signed attributes - indexed by
* the OID of the attribute.
*/
public AttributeTable getSignedAttributes()
{
if (signedAttributeSet != null && signedAttributeValues == null)
{
signedAttributeValues = new AttributeTable(signedAttributeSet);
}
return signedAttributeValues;
}
/**
* return a table of the unsigned attributes indexed by
* the OID of the attribute.
*/
public AttributeTable getUnsignedAttributes()
{
if (unsignedAttributeSet != null && unsignedAttributeValues == null)
{
unsignedAttributeValues = new AttributeTable(unsignedAttributeSet);
}
return unsignedAttributeValues;
}
/**
* return the encoded signature
*/
public byte[] getSignature()
{
return Arrays.clone(signature);
}
/**
* 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());
counterSignatures.add(new SignerInformation(si, null, new CMSProcessableByteArray(getSignature()), null));
}
}
return new SignerInformationStore(counterSignatures);
}
/**
* return the DER encoding of the signed attributes.
*
* @throws IOException if an encoding error occurs.
*/
public byte[] getEncodedSignedAttributes()
throws IOException
{
if (signedAttributeSet != null)
{
return signedAttributeSet.getEncoded(ASN1Encoding.DER);
}
return null;
}
private boolean doVerify(
SignerInformationVerifier verifier)
throws CMSException
{
String encName = CMSSignedHelper.INSTANCE.getEncryptionAlgName(this.getEncryptionAlgOID());
ContentVerifier contentVerifier;
try
{
contentVerifier = verifier.getContentVerifier(encryptionAlgorithm, info.getDigestAlgorithm());
}
catch (OperatorCreationException e)
{
throw new CMSException("can't create content verifier: " + e.getMessage(), e);
}
try
{
OutputStream sigOut = contentVerifier.getOutputStream();
if (resultDigest == null)
{
DigestCalculator calc = verifier.getDigestCalculator(this.getDigestAlgorithmID());
if (content != null)
{
OutputStream digOut = calc.getOutputStream();
if (signedAttributeSet == null)
{
if (contentVerifier instanceof RawContentVerifier)
{
content.write(digOut);
}
else
{
OutputStream cOut = new TeeOutputStream(digOut, sigOut);
content.write(cOut);
cOut.close();
}
}
else
{
content.write(digOut);
sigOut.write(this.getEncodedSignedAttributes());
}
digOut.close();
}
else if (signedAttributeSet != null)
{
sigOut.write(this.getEncodedSignedAttributes());
}
else
{
// 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();
}
else
{
if (signedAttributeSet == null)
{
if (content != null)
{
content.write(sigOut);
}
}
else
{
sigOut.write(this.getEncodedSignedAttributes());
}
}
sigOut.close();
}
catch (IOException e)
{
throw new CMSException("can't process mime object to create signature.", 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
verifyContentTypeAttributeValue();
AttributeTable signedAttrTable = this.getSignedAttributes();
// RFC 6211 Validate Algorithm Identifier protection attribute if present
verifyAlgorithmIdentifierProtectionAttribute(signedAttrTable);
// RFC 3852 11.2 Check the message-digest attribute is correct
verifyMessageDigestAttribute();
// RFC 3852 11.4 Validate countersignature attribute(s)
verifyCounterSignatureAttribute(signedAttrTable);
try
{
if (signedAttributeSet == null && resultDigest != null)
{
if (contentVerifier instanceof RawContentVerifier)
{
RawContentVerifier rawVerifier = (RawContentVerifier)contentVerifier;
if (encName.equals("RSA"))
{
DigestInfo digInfo = new DigestInfo(new AlgorithmIdentifier(digestAlgorithm.getAlgorithm(), DERNull.INSTANCE), resultDigest);
return rawVerifier.verify(digInfo.getEncoded(ASN1Encoding.DER), this.getSignature());
}
return rawVerifier.verify(resultDigest, this.getSignature());
}
}
return contentVerifier.verify(this.getSignature());
}
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
*
* @throws CMSException when content-type was invalid.
*/
private void verifyContentTypeAttributeValue()
throws CMSException
{
ASN1Primitive 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 ASN1ObjectIdentifier))
{
throw new CMSException("content-type attribute value not of ASN.1 type 'OBJECT IDENTIFIER'");
}
ASN1ObjectIdentifier signedContentType = (ASN1ObjectIdentifier)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
*
* @throws CMSException when message-digest attribute was rejected
*/
private void verifyMessageDigestAttribute()
throws CMSException
{
ASN1Primitive 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 6211 Validate Algorithm Identifier protection attribute if present
*
* @param signedAttrTable signed attributes
* @throws CMSException when cmsAlgorihmProtect attribute was rejected
*/
private void verifyAlgorithmIdentifierProtectionAttribute(AttributeTable signedAttrTable)
throws CMSException
{
AttributeTable unsignedAttrTable = this.getUnsignedAttributes();
if (unsignedAttrTable != null && unsignedAttrTable.getAll(CMSAttributes.cmsAlgorithmProtect).size() > 0)
{
throw new CMSException("A cmsAlgorithmProtect attribute MUST be a signed attribute");
}
if (signedAttrTable != null)
{
ASN1EncodableVector protectionAttributes = signedAttrTable.getAll(CMSAttributes.cmsAlgorithmProtect);
if (protectionAttributes.size() > 1)
{
throw new CMSException("Only one instance of a cmsAlgorithmProtect attribute can be present");
}
if (protectionAttributes.size() > 0)
{
Attribute attr = Attribute.getInstance(protectionAttributes.get(0));
if (attr.getAttrValues().size() != 1)
{
throw new CMSException("A cmsAlgorithmProtect attribute MUST contain exactly one value");
}
CMSAlgorithmProtection algorithmProtection = CMSAlgorithmProtection.getInstance(attr.getAttributeValues()[0]);
if (!CMSUtils.isEquivalent(algorithmProtection.getDigestAlgorithm(), info.getDigestAlgorithm()))
{
throw new CMSException("CMS Algorithm Identifier Protection check failed for digestAlgorithm");
}
if (!CMSUtils.isEquivalent(algorithmProtection.getSignatureAlgorithm(), info.getDigestEncryptionAlgorithm()))
{
throw new CMSException("CMS Algorithm Identifier Protection check failed for signatureAlgorithm");
}
}
}
}
/**
* RFC 3852 11.4 Validate countersignature attribute(s)
*
* @param signedAttrTable signed attributes
* @throws CMSException when countersignature attribute was rejected
*/
private void verifyCounterSignatureAttribute(AttributeTable signedAttrTable)
throws CMSException
{
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.getInstance(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
}
}
}
/**
* Verify that the given verifier can successfully verify the signature on
* this SignerInformation object.
*
* @param verifier a suitably configured SignerInformationVerifier.
* @return true if the signer information is verified, false otherwise.
* @throws org.bouncycastle.cms.CMSVerifierCertificateNotValidException if the provider has an associated certificate and the certificate is not valid at the time given as the SignerInfo's signing time.
* @throws org.bouncycastle.cms.CMSException if the verifier is unable to create a ContentVerifiers or DigestCalculators.
*/
public boolean verify(SignerInformationVerifier verifier)
throws CMSException
{
Time signingTime = getSigningTime(); // has to be validated if present.
if (verifier.hasAssociatedCertificate())
{
if (signingTime != null)
{
X509CertificateHolder dcv = verifier.getAssociatedCertificate();
if (!dcv.isValidOn(signingTime.getDate()))
{
throw new CMSVerifierCertificateNotValidException("verifier not valid at signingTime");
}
}
}
return doVerify(verifier);
}
/**
* Return the underlying ASN.1 object defining this SignerInformation object.
*
* @return a SignerInfo.
*/
public SignerInfo toASN1Structure()
{
return info;
}
private ASN1Primitive getSingleValuedSignedAttribute(
ASN1ObjectIdentifier 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).toASN1Primitive();
}
default:
throw new CMSException("The SignedAttributes in a signerInfo MUST NOT include multiple instances of the "
+ printableName + " attribute");
}
}
private Time getSigningTime()
throws CMSException
{
ASN1Primitive validSigningTime = getSingleValuedSignedAttribute(
CMSAttributes.signingTime, "signing-time");
if (validSigningTime == null)
{
return null;
}
try
{
return Time.getInstance(validSigningTime);
}
catch (IllegalArgumentException e)
{
throw new CMSException("signing-time attribute value not a valid 'Time' structure");
}
}
/**
* Return a signer information object with the passed in unsigned
* attributes replacing the ones that are current associated with
* the object passed in.
*
* @param signerInformation the signerInfo to be used as the basis.
* @param unsignedAttributes the unsigned attributes to add.
* @return a copy of the original SignerInformationObject with the changed attributes.
*/
public static SignerInformation replaceUnsignedAttributes(
SignerInformation signerInformation,
AttributeTable unsignedAttributes)
{
SignerInfo sInfo = signerInformation.info;
ASN1Set unsignedAttr = null;
if (unsignedAttributes != null)
{
unsignedAttr = new DERSet(unsignedAttributes.toASN1EncodableVector());
}
return new SignerInformation(
new SignerInfo(sInfo.getSID(), sInfo.getDigestAlgorithm(),
sInfo.getAuthenticatedAttributes(), sInfo.getDigestEncryptionAlgorithm(), sInfo.getEncryptedDigest(), unsignedAttr),
signerInformation.contentType, signerInformation.content, null);
}
/**
* Return a signer information object with passed in SignerInformationStore representing counter
* signatures attached as an unsigned attribute.
*
* @param signerInformation the signerInfo to be used as the basis.
* @param counterSigners signer info objects carrying counter signature.
* @return a copy of the original SignerInformationObject with the changed attributes.
*/
public static SignerInformation addCounterSigners(
SignerInformation signerInformation,
SignerInformationStore counterSigners)
{
// TODO Perform checks from RFC 3852 11.4
SignerInfo sInfo = signerInformation.info;
AttributeTable unsignedAttr = signerInformation.getUnsignedAttributes();
ASN1EncodableVector v;
if (unsignedAttr != null)
{
v = unsignedAttr.toASN1EncodableVector();
}
else
{
v = new ASN1EncodableVector();
}
ASN1EncodableVector sigs = new ASN1EncodableVector();
for (Iterator it = counterSigners.getSigners().iterator(); it.hasNext(); )
{
sigs.add(((SignerInformation)it.next()).toASN1Structure());
}
v.add(new Attribute(CMSAttributes.counterSignature, new DERSet(sigs)));
return new SignerInformation(
new SignerInfo(sInfo.getSID(), sInfo.getDigestAlgorithm(),
sInfo.getAuthenticatedAttributes(), sInfo.getDigestEncryptionAlgorithm(), sInfo.getEncryptedDigest(), new DERSet(v)),
signerInformation.contentType, signerInformation.content, null);
}
}
