org.bouncycastle.asn1.cms.EncryptedContentInfo.java Source code

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Here is the source code for org.bouncycastle.asn1.cms.EncryptedContentInfo.java

Source

package org.bouncycastle.asn1.cms;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.BERSequence;
import org.bouncycastle.asn1.BERTaggedObject;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * <a href="http://tools.ietf.org/html/rfc5652#section-6.1">RFC 5652</a> EncryptedContentInfo object.
 *
 * <pre>
 * EncryptedContentInfo ::= SEQUENCE {
 *     contentType ContentType,
 *     contentEncryptionAlgorithm ContentEncryptionAlgorithmIdentifier,
 *     encryptedContent [0] IMPLICIT EncryptedContent OPTIONAL 
 * }
 * </pre>
 */
public class EncryptedContentInfo extends ASN1Object {
    private ASN1ObjectIdentifier contentType;
    private AlgorithmIdentifier contentEncryptionAlgorithm;
    private ASN1OctetString encryptedContent;

    public EncryptedContentInfo(ASN1ObjectIdentifier contentType, AlgorithmIdentifier contentEncryptionAlgorithm,
            ASN1OctetString encryptedContent) {
        this.contentType = contentType;
        this.contentEncryptionAlgorithm = contentEncryptionAlgorithm;
        this.encryptedContent = encryptedContent;
    }

    private EncryptedContentInfo(ASN1Sequence seq) {
        if (seq.size() < 2) {
            throw new IllegalArgumentException("Truncated Sequence Found");
        }

        contentType = (ASN1ObjectIdentifier) seq.getObjectAt(0);
        contentEncryptionAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(1));
        if (seq.size() > 2) {
            encryptedContent = ASN1OctetString.getInstance((ASN1TaggedObject) seq.getObjectAt(2), false);
        }
    }

    /**
     * Return an EncryptedContentInfo object from the given object.
     * <p>
     * Accepted inputs:
     * <ul>
     * <li> null &rarr; null
     * <li> {@link EncryptedContentInfo} object
     * <li> {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats
     * </ul>
     *
     * @param obj the object we want converted.
     * @exception IllegalArgumentException if the object cannot be converted.
     */
    public static EncryptedContentInfo getInstance(Object obj) {
        if (obj instanceof EncryptedContentInfo) {
            return (EncryptedContentInfo) obj;
        }
        if (obj != null) {
            return new EncryptedContentInfo(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public ASN1ObjectIdentifier getContentType() {
        return contentType;
    }

    public AlgorithmIdentifier getContentEncryptionAlgorithm() {
        return contentEncryptionAlgorithm;
    }

    public ASN1OctetString getEncryptedContent() {
        return encryptedContent;
    }

    /** 
     * Produce an object suitable for an ASN1OutputStream.
     */
    public ASN1Primitive toASN1Primitive() {
        ASN1EncodableVector v = new ASN1EncodableVector(3);

        v.add(contentType);
        v.add(contentEncryptionAlgorithm);

        if (encryptedContent != null) {
            v.add(new BERTaggedObject(false, 0, encryptedContent));
        }

        return new BERSequence(v);
    }
}