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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.
package org.bouncycastle.asn1.cms;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.BERSequence;
import org.bouncycastle.asn1.BERSet;
import org.bouncycastle.asn1.BERTaggedObject;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERObjectIdentifier;
import org.bouncycastle.asn1.DERTaggedObject;
import java.util.Enumeration;
/**
* a signed data object.
*/
public class SignedData
extends ASN1Encodable
{
private DERInteger version;
private ASN1Set digestAlgorithms;
private ContentInfo contentInfo;
private ASN1Set certificates;
private ASN1Set crls;
private ASN1Set signerInfos;
private boolean certsBer;
private boolean crlsBer;
public static SignedData getInstance(
Object o)
{
if (o instanceof SignedData)
{
return (SignedData)o;
}
else if (o instanceof ASN1Sequence)
{
return new SignedData((ASN1Sequence)o);
}
throw new IllegalArgumentException("unknown object in factory: " + o.getClass().getName());
}
public SignedData(
ASN1Set digestAlgorithms,
ContentInfo contentInfo,
ASN1Set certificates,
ASN1Set crls,
ASN1Set signerInfos)
{
this.version = calculateVersion(contentInfo.getContentType(), certificates, crls, signerInfos);
this.digestAlgorithms = digestAlgorithms;
this.contentInfo = contentInfo;
this.certificates = certificates;
this.crls = crls;
this.signerInfos = signerInfos;
this.crlsBer = crls instanceof BERSet;
this.certsBer = certificates instanceof BERSet;
}
// RFC3852, section 5.1:
// IF ((certificates is present) AND
// (any certificates with a type of other are present)) OR
// ((crls is present) AND
// (any crls with a type of other are present))
// THEN version MUST be 5
// ELSE
// IF (certificates is present) AND
// (any version 2 attribute certificates are present)
// THEN version MUST be 4
// ELSE
// IF ((certificates is present) AND
// (any version 1 attribute certificates are present)) OR
// (any SignerInfo structures are version 3) OR
// (encapContentInfo eContentType is other than id-data)
// THEN version MUST be 3
// ELSE version MUST be 1
//
private DERInteger calculateVersion(
DERObjectIdentifier contentOid,
ASN1Set certs,
ASN1Set crls,
ASN1Set signerInfs)
{
boolean otherCert = false;
boolean otherCrl = false;
boolean attrCertV1Found = false;
boolean attrCertV2Found = false;
if (certs != null)
{
for (Enumeration en = certs.getObjects(); en.hasMoreElements();)
{
Object obj = en.nextElement();
if (obj instanceof ASN1TaggedObject)
{
ASN1TaggedObject tagged = (ASN1TaggedObject)obj;
if (tagged.getTagNo() == 1)
{
attrCertV1Found = true;
}
else if (tagged.getTagNo() == 2)
{
attrCertV2Found = true;
}
else if (tagged.getTagNo() == 3)
{
otherCert = true;
}
}
}
}
if (otherCert)
{
return new DERInteger(5);
}
if (crls != null) // no need to check if otherCert is true
{
for (Enumeration en = crls.getObjects(); en.hasMoreElements();)
{
Object obj = en.nextElement();
if (obj instanceof ASN1TaggedObject)
{
otherCrl = true;
}
}
}
if (otherCrl)
{
return new DERInteger(5);
}
if (attrCertV2Found)
{
return new DERInteger(4);
}
if (attrCertV1Found)
{
return new DERInteger(3);
}
if (contentOid.equals(CMSObjectIdentifiers.data))
{
if (checkForVersion3(signerInfs))
{
return new DERInteger(3);
}
else
{
return new DERInteger(1);
}
}
else
{
return new DERInteger(3);
}
}
private boolean checkForVersion3(ASN1Set signerInfs)
{
for (Enumeration e = signerInfs.getObjects(); e.hasMoreElements();)
{
SignerInfo s = SignerInfo.getInstance(e.nextElement());
if (s.getVersion().getValue().intValue() == 3)
{
return true;
}
}
return false;
}
public SignedData(
ASN1Sequence seq)
{
Enumeration e = seq.getObjects();
version = (DERInteger)e.nextElement();
digestAlgorithms = ((ASN1Set)e.nextElement());
contentInfo = ContentInfo.getInstance(e.nextElement());
while (e.hasMoreElements())
{
DERObject o = (DERObject)e.nextElement();
//
// an interesting feature of SignedData is that there appear
// to be varying implementations...
// for the moment we ignore anything which doesn't fit.
//
if (o instanceof ASN1TaggedObject)
{
ASN1TaggedObject tagged = (ASN1TaggedObject)o;
switch (tagged.getTagNo())
{
case 0:
certsBer = tagged instanceof BERTaggedObject;
certificates = ASN1Set.getInstance(tagged, false);
break;
case 1:
crlsBer = tagged instanceof BERTaggedObject;
crls = ASN1Set.getInstance(tagged, false);
break;
default:
throw new IllegalArgumentException("unknown tag value " + tagged.getTagNo());
}
}
else
{
signerInfos = (ASN1Set)o;
}
}
}
public DERInteger getVersion()
{
return version;
}
public ASN1Set getDigestAlgorithms()
{
return digestAlgorithms;
}
public ContentInfo getEncapContentInfo()
{
return contentInfo;
}
public ASN1Set getCertificates()
{
return certificates;
}
public ASN1Set getCRLs()
{
return crls;
}
public ASN1Set getSignerInfos()
{
return signerInfos;
}
/**
* Produce an object suitable for an ASN1OutputStream.
*
* SignedData ::= SEQUENCE {
* version CMSVersion,
* digestAlgorithms DigestAlgorithmIdentifiers,
* encapContentInfo EncapsulatedContentInfo,
* certificates [0] IMPLICIT CertificateSet OPTIONAL,
* crls [1] IMPLICIT CertificateRevocationLists OPTIONAL,
* signerInfos SignerInfos
* }
*
*/
public DERObject toASN1Object()
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(version);
v.add(digestAlgorithms);
v.add(contentInfo);
if (certificates != null)
{
if (certsBer)
{
v.add(new BERTaggedObject(false, 0, certificates));
}
else
{
v.add(new DERTaggedObject(false, 0, certificates));
}
}
if (crls != null)
{
if (crlsBer)
{
v.add(new BERTaggedObject(false, 1, crls));
}
else
{
v.add(new DERTaggedObject(false, 1, crls));
}
}
v.add(signerInfos);
return new BERSequence(v);
}
}