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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.io.IOException;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1SequenceParser;
import org.bouncycastle.asn1.ASN1SetParser;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.ASN1TaggedObjectParser;
import org.bouncycastle.asn1.BERTags;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * Parse {@link AuthenticatedData} stream.
 * 
 * AuthenticatedData ::= SEQUENCE {
 *       version CMSVersion,
 *       originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
 *       recipientInfos RecipientInfos,
 *       macAlgorithm MessageAuthenticationCodeAlgorithm,
 *       digestAlgorithm [1] DigestAlgorithmIdentifier OPTIONAL,
 *       encapContentInfo EncapsulatedContentInfo,
 *       authAttrs [2] IMPLICIT AuthAttributes OPTIONAL,
 *       mac MessageAuthenticationCode,
 *       unauthAttrs [3] IMPLICIT UnauthAttributes OPTIONAL }
 *
 * AuthAttributes ::= SET SIZE (1..MAX) OF Attribute
 *
 * UnauthAttributes ::= SET SIZE (1..MAX) OF Attribute
 *
 * MessageAuthenticationCode ::= OCTET STRING
 * 
*/ public class AuthenticatedDataParser { private ASN1SequenceParser seq; private ASN1Integer version; private ASN1Encodable nextObject; private boolean originatorInfoCalled; public AuthenticatedDataParser( ASN1SequenceParser seq) throws IOException { this.seq = seq; this.version = ASN1Integer.getInstance(seq.readObject()); } public ASN1Integer getVersion() { return version; } public OriginatorInfo getOriginatorInfo() throws IOException { originatorInfoCalled = true; if (nextObject == null) { nextObject = seq.readObject(); } if (nextObject instanceof ASN1TaggedObjectParser && ((ASN1TaggedObjectParser)nextObject).getTagNo() == 0) { ASN1SequenceParser originatorInfo = (ASN1SequenceParser) ((ASN1TaggedObjectParser)nextObject).getObjectParser(BERTags.SEQUENCE, false); nextObject = null; return OriginatorInfo.getInstance(originatorInfo.toASN1Primitive()); } return null; } public ASN1SetParser getRecipientInfos() throws IOException { if (!originatorInfoCalled) { getOriginatorInfo(); } if (nextObject == null) { nextObject = seq.readObject(); } ASN1SetParser recipientInfos = (ASN1SetParser)nextObject; nextObject = null; return recipientInfos; } public AlgorithmIdentifier getMacAlgorithm() throws IOException { if (nextObject == null) { nextObject = seq.readObject(); } if (nextObject != null) { ASN1SequenceParser o = (ASN1SequenceParser)nextObject; nextObject = null; return AlgorithmIdentifier.getInstance(o.toASN1Primitive()); } return null; } public AlgorithmIdentifier getDigestAlgorithm() throws IOException { if (nextObject == null) { nextObject = seq.readObject(); } if (nextObject instanceof ASN1TaggedObjectParser) { AlgorithmIdentifier obj = AlgorithmIdentifier.getInstance((ASN1TaggedObject)nextObject.toASN1Primitive(), false); nextObject = null; return obj; } return null; } /** * @deprecated use getEncapsulatedContentInfo() */ public ContentInfoParser getEnapsulatedContentInfo() throws IOException { return getEncapsulatedContentInfo(); } public ContentInfoParser getEncapsulatedContentInfo() throws IOException { if (nextObject == null) { nextObject = seq.readObject(); } if (nextObject != null) { ASN1SequenceParser o = (ASN1SequenceParser)nextObject; nextObject = null; return new ContentInfoParser(o); } return null; } public ASN1SetParser getAuthAttrs() throws IOException { if (nextObject == null) { nextObject = seq.readObject(); } if (nextObject instanceof ASN1TaggedObjectParser) { ASN1Encodable o = nextObject; nextObject = null; return (ASN1SetParser)((ASN1TaggedObjectParser)o).getObjectParser(BERTags.SET, false); } return null; } public ASN1OctetString getMac() throws IOException { if (nextObject == null) { nextObject = seq.readObject(); } ASN1Encodable o = nextObject; nextObject = null; return ASN1OctetString.getInstance(o.toASN1Primitive()); } public ASN1SetParser getUnauthAttrs() throws IOException { if (nextObject == null) { nextObject = seq.readObject(); } if (nextObject != null) { ASN1Encodable o = nextObject; nextObject = null; return (ASN1SetParser)((ASN1TaggedObjectParser)o).getObjectParser(BERTags.SET, false); } return null; } }




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