org.bouncycastle.asn1.cms.DigestedData Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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/***************************************************************/
/******    DO NOT EDIT THIS CLASS bc-java SOURCE FILE     ******/
/***************************************************************/
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.BERSequence;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/** 
 * RFC 5652 DigestedData object.
 *  * DigestedData ::= SEQUENCE {
 *       version CMSVersion,
 *       digestAlgorithm DigestAlgorithmIdentifier,
 *       encapContentInfo EncapsulatedContentInfo,
 *       digest Digest }
 * 
 */
public class DigestedData
    extends ASN1Object
{
    private ASN1Integer           version;
    private AlgorithmIdentifier  digestAlgorithm;
    private ContentInfo          encapContentInfo;
    private ASN1OctetString      digest;

    public DigestedData(
        AlgorithmIdentifier digestAlgorithm,
        ContentInfo encapContentInfo,
        byte[]      digest)
    {
        this.version = new ASN1Integer(0);
        this.digestAlgorithm = digestAlgorithm;
        this.encapContentInfo = encapContentInfo;
        this.digest = new DEROctetString(digest);
    }

    private DigestedData(
        ASN1Sequence seq)
    {
        this.version = (ASN1Integer)seq.getObjectAt(0);
        this.digestAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(1));
        this.encapContentInfo = ContentInfo.getInstance(seq.getObjectAt(2));
        this.digest = ASN1OctetString.getInstance(seq.getObjectAt(3));
    }

    /**
     * Return a DigestedData object from a tagged object.
     *
     * @param ato the tagged object holding the object we want.
     * @param isExplicit 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 DigestedData getInstance(
        ASN1TaggedObject ato,
        boolean isExplicit)
    {
        return getInstance(ASN1Sequence.getInstance(ato, isExplicit));
    }
    
    /**
     * Return a DigestedData object from the given object.
     * 
     * Accepted inputs:
     * 

     *  null → null
     * 
 {@link DigestedData} object
     * 
 {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats
     * 
     *
     * @param obj the object we want converted.
     * @exception IllegalArgumentException if the object cannot be converted.
     */
    public static DigestedData getInstance(
        Object obj)
    {
        if (obj instanceof DigestedData)
        {
            return (DigestedData)obj;
        }
        
        if (obj != null)
        {
            return new DigestedData(ASN1Sequence.getInstance(obj));
        }
        
        return null;
    }

    public ASN1Integer getVersion()
    {
        return version;
    }

    public AlgorithmIdentifier getDigestAlgorithm()
    {
        return digestAlgorithm;
    }

    public ContentInfo getEncapContentInfo()
    {
        return encapContentInfo;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(version);
        v.add(digestAlgorithm);
        v.add(encapContentInfo);
        v.add(digest);

        return new BERSequence(v);
    }

    public byte[] getDigest()
    {
        return digest.getOctets();
    }
}