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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 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.

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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.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.DERTaggedObject;

/**
 * RFC 5652 EnvelopedData object.
 * 
 * EnvelopedData ::= SEQUENCE {
 *     version CMSVersion,
 *     originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
 *     recipientInfos RecipientInfos,
 *     encryptedContentInfo EncryptedContentInfo,
 *     unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL 
 * }
 * 
*/ public class EnvelopedData extends ASN1Object { private ASN1Integer version; private OriginatorInfo originatorInfo; private ASN1Set recipientInfos; private EncryptedContentInfo encryptedContentInfo; private ASN1Set unprotectedAttrs; public EnvelopedData( OriginatorInfo originatorInfo, ASN1Set recipientInfos, EncryptedContentInfo encryptedContentInfo, ASN1Set unprotectedAttrs) { version = new ASN1Integer(calculateVersion(originatorInfo, recipientInfos, unprotectedAttrs)); this.originatorInfo = originatorInfo; this.recipientInfos = recipientInfos; this.encryptedContentInfo = encryptedContentInfo; this.unprotectedAttrs = unprotectedAttrs; } public EnvelopedData( OriginatorInfo originatorInfo, ASN1Set recipientInfos, EncryptedContentInfo encryptedContentInfo, Attributes unprotectedAttrs) { version = new ASN1Integer(calculateVersion(originatorInfo, recipientInfos, ASN1Set.getInstance(unprotectedAttrs))); this.originatorInfo = originatorInfo; this.recipientInfos = recipientInfos; this.encryptedContentInfo = encryptedContentInfo; this.unprotectedAttrs = ASN1Set.getInstance(unprotectedAttrs); } /** * @deprecated use getInstance() */ public EnvelopedData( ASN1Sequence seq) { int index = 0; version = (ASN1Integer)seq.getObjectAt(index++); Object tmp = seq.getObjectAt(index++); if (tmp instanceof ASN1TaggedObject) { originatorInfo = OriginatorInfo.getInstance((ASN1TaggedObject)tmp, false); tmp = seq.getObjectAt(index++); } recipientInfos = ASN1Set.getInstance(tmp); encryptedContentInfo = EncryptedContentInfo.getInstance(seq.getObjectAt(index++)); if(seq.size() > index) { unprotectedAttrs = ASN1Set.getInstance((ASN1TaggedObject)seq.getObjectAt(index), false); } } /** * Return an EnvelopedData object from a tagged object. * * @param obj the tagged object holding the object we want. * @param explicit true if the object is meant to be explicitly * tagged false otherwise. * @exception IllegalArgumentException if the object held by the * tagged object cannot be converted. */ public static EnvelopedData getInstance( ASN1TaggedObject obj, boolean explicit) { return getInstance(ASN1Sequence.getInstance(obj, explicit)); } /** * Return an EnvelopedData object from the given object. *

* Accepted inputs: *

    *
  • null → null *
  • {@link EnvelopedData} object *
  • {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with EnvelopedData structure inside *
* * @param obj the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static EnvelopedData getInstance( Object obj) { if (obj instanceof EnvelopedData) { return (EnvelopedData)obj; } if (obj != null) { return new EnvelopedData(ASN1Sequence.getInstance(obj)); } return null; } public ASN1Integer getVersion() { return version; } public OriginatorInfo getOriginatorInfo() { return originatorInfo; } public ASN1Set getRecipientInfos() { return recipientInfos; } public EncryptedContentInfo getEncryptedContentInfo() { return encryptedContentInfo; } public ASN1Set getUnprotectedAttrs() { return unprotectedAttrs; } /** * Produce an object suitable for an ASN1OutputStream. */ public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(); v.add(version); if (originatorInfo != null) { v.add(new DERTaggedObject(false, 0, originatorInfo)); } v.add(recipientInfos); v.add(encryptedContentInfo); if (unprotectedAttrs != null) { v.add(new DERTaggedObject(false, 1, unprotectedAttrs)); } return new BERSequence(v); } public static int calculateVersion(OriginatorInfo originatorInfo, ASN1Set recipientInfos, ASN1Set unprotectedAttrs) { int version; if (originatorInfo != null || unprotectedAttrs != null) { version = 2; } else { version = 0; Enumeration e = recipientInfos.getObjects(); while (e.hasMoreElements()) { RecipientInfo ri = RecipientInfo.getInstance(e.nextElement()); if (ri.getVersion().getValue().intValue() != version) { version = 2; break; } } } return version; } }




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