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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 org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * RFC 5652:
 * Content encryption key delivery mechanisms.
 * 
 * PasswordRecipientInfo ::= SEQUENCE {
 *     version       CMSVersion,   -- Always set to 0
 *     keyDerivationAlgorithm [0] KeyDerivationAlgorithmIdentifier
 *                             OPTIONAL,
 *     keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
 *     encryptedKey  EncryptedKey }
 * 
*/ public class PasswordRecipientInfo extends ASN1Object { private ASN1Integer version; private AlgorithmIdentifier keyDerivationAlgorithm; private AlgorithmIdentifier keyEncryptionAlgorithm; private ASN1OctetString encryptedKey; public PasswordRecipientInfo( AlgorithmIdentifier keyEncryptionAlgorithm, ASN1OctetString encryptedKey) { this.version = new ASN1Integer(0); this.keyEncryptionAlgorithm = keyEncryptionAlgorithm; this.encryptedKey = encryptedKey; } public PasswordRecipientInfo( AlgorithmIdentifier keyDerivationAlgorithm, AlgorithmIdentifier keyEncryptionAlgorithm, ASN1OctetString encryptedKey) { this.version = new ASN1Integer(0); this.keyDerivationAlgorithm = keyDerivationAlgorithm; this.keyEncryptionAlgorithm = keyEncryptionAlgorithm; this.encryptedKey = encryptedKey; } /** * @deprecated use getInstance() method. */ public PasswordRecipientInfo( ASN1Sequence seq) { version = (ASN1Integer)seq.getObjectAt(0); if (seq.getObjectAt(1) instanceof ASN1TaggedObject) { keyDerivationAlgorithm = AlgorithmIdentifier.getInstance((ASN1TaggedObject)seq.getObjectAt(1), false); keyEncryptionAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(2)); encryptedKey = (ASN1OctetString)seq.getObjectAt(3); } else { keyEncryptionAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(1)); encryptedKey = (ASN1OctetString)seq.getObjectAt(2); } } /** * Return a PasswordRecipientInfo 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 PasswordRecipientInfo getInstance( ASN1TaggedObject obj, boolean explicit) { return getInstance(ASN1Sequence.getInstance(obj, explicit)); } /** * Return a PasswordRecipientInfo object from the given object. *

* Accepted inputs: *

    *
  • null → null *
  • {@link PasswordRecipientInfo} object *
  • {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with PasswordRecipientInfo structure inside *
* * @param obj the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static PasswordRecipientInfo getInstance( Object obj) { if (obj instanceof PasswordRecipientInfo) { return (PasswordRecipientInfo)obj; } if (obj != null) { return new PasswordRecipientInfo(ASN1Sequence.getInstance(obj)); } return null; } public ASN1Integer getVersion() { return version; } public AlgorithmIdentifier getKeyDerivationAlgorithm() { return keyDerivationAlgorithm; } public AlgorithmIdentifier getKeyEncryptionAlgorithm() { return keyEncryptionAlgorithm; } public ASN1OctetString getEncryptedKey() { return encryptedKey; } /** * Produce an object suitable for an ASN1OutputStream. */ public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(); v.add(version); if (keyDerivationAlgorithm != null) { v.add(new DERTaggedObject(false, 0, keyDerivationAlgorithm)); } v.add(keyEncryptionAlgorithm); v.add(encryptedKey); return new DERSequence(v); } }




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