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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar
contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one
provided with the Bouncy Castle Cryptography APIs.
package org.bouncycastle.asn1.cms;
import java.util.Enumeration;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
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.DERTaggedObject;
/**
* RFC 5652:
*
* A signed data object containing multitude of {@link SignerInfo}s.
*
* SignedData ::= SEQUENCE {
* version CMSVersion,
* digestAlgorithms DigestAlgorithmIdentifiers,
* encapContentInfo EncapsulatedContentInfo,
* certificates [0] IMPLICIT CertificateSet OPTIONAL,
* crls [1] IMPLICIT CertificateRevocationLists OPTIONAL,
* signerInfos SignerInfos
* }
*
* DigestAlgorithmIdentifiers ::= SET OF DigestAlgorithmIdentifier
*
* SignerInfos ::= SET OF SignerInfo
*
*
* The version calculation uses following ruleset from RFC 5652 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
*
*
*/
public class SignedData
extends ASN1Object
{
private static final ASN1Integer VERSION_1 = new ASN1Integer(1);
private static final ASN1Integer VERSION_3 = new ASN1Integer(3);
private static final ASN1Integer VERSION_4 = new ASN1Integer(4);
private static final ASN1Integer VERSION_5 = new ASN1Integer(5);
private ASN1Integer version;
private ASN1Set digestAlgorithms;
private ContentInfo contentInfo;
private ASN1Set certificates;
private ASN1Set crls;
private ASN1Set signerInfos;
private boolean certsBer;
private boolean crlsBer;
/**
* Return a SignedData object from the given object.
*
* Accepted inputs:
*
* - null → null
*
- {@link SignedData} object
*
- {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with SignedData structure inside
*
*
* @param o the object we want converted.
* @return a reference that can be assigned to SignedData (may be null)
* @throws IllegalArgumentException if the object cannot be converted.
*/
public static SignedData getInstance(
Object o)
{
if (o instanceof SignedData)
{
return (SignedData)o;
}
else if (o != null)
{
return new SignedData(ASN1Sequence.getInstance(o));
}
return null;
}
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;
}
private ASN1Integer calculateVersion(
ASN1ObjectIdentifier 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.getInstance(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 ASN1Integer(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 VERSION_5;
}
if (attrCertV2Found)
{
return VERSION_4;
}
if (attrCertV1Found)
{
return VERSION_3;
}
if (checkForVersion3(signerInfs))
{
return VERSION_3;
}
if (!CMSObjectIdentifiers.data.equals(contentOid))
{
return VERSION_3;
}
return VERSION_1;
}
private boolean checkForVersion3(ASN1Set signerInfs)
{
for (Enumeration e = signerInfs.getObjects(); e.hasMoreElements();)
{
SignerInfo s = SignerInfo.getInstance(e.nextElement());
if (s.getVersion().intValueExact() == 3)
{
return true;
}
}
return false;
}
private SignedData(
ASN1Sequence seq)
{
Enumeration e = seq.getObjects();
version = ASN1Integer.getInstance(e.nextElement());
digestAlgorithms = ((ASN1Set)e.nextElement());
contentInfo = ContentInfo.getInstance(e.nextElement());
while (e.hasMoreElements())
{
ASN1Primitive o = (ASN1Primitive)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 ASN1Integer 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.
*/
public ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector v = new ASN1EncodableVector(6);
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);
}
}