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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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package org.bouncycastle.asn1.tsp;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DLSequence;

/**
 * Implementation of the EncryptionInfo element defined in RFC 4998:
 * 
 * 1988 ASN.1 EncryptionInfo
 * 

 * EncryptionInfo       ::=     SEQUENCE {
 * encryptionInfoType     OBJECT IDENTIFIER,
 * encryptionInfoValue    ANY DEFINED BY encryptionInfoType
 * }
 * 

 * 1997-ASN.1 EncryptionInfo
 * 

 * EncryptionInfo       ::=     SEQUENCE {
 * encryptionInfoType   ENCINFO-TYPE.&id
 * ({SupportedEncryptionAlgorithms}),
 * encryptionInfoValue  ENCINFO-TYPE.&Type
 * ({SupportedEncryptionAlgorithms}{@encryptionInfoType})
 * }
 * 

 * ENCINFO-TYPE ::= TYPE-IDENTIFIER
 * 
 * SupportedEncryptionAlgorithms ENCINFO-TYPE ::= {...}
 */
public class EncryptionInfo
    extends ASN1Object
{

    /**
     * The OID for EncryptionInfo type.
     */
    private ASN1ObjectIdentifier encryptionInfoType;

    /**
     * The value of EncryptionInfo
     */
    private ASN1Encodable encryptionInfoValue;

    /**
     * @deprecated Use {@link EncryptionInfo#getInstance(Object)} instead.
     */
    public static EncryptionInfo getInstance(final ASN1Object obj)
    {
        return getInstance((Object)obj);
    }

    public static EncryptionInfo getInstance(final Object obj)
    {
        if (obj instanceof EncryptionInfo)
        {
            return (EncryptionInfo)obj;
        }
        else if (obj != null)
        {
            return new EncryptionInfo(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public static EncryptionInfo getInstance(
        ASN1TaggedObject obj,
        boolean explicit)
    {
        return getInstance((Object)ASN1Sequence.getInstance(obj, explicit));
    }

    private EncryptionInfo(ASN1Sequence sequence)
    {
        if (sequence.size() != 2)
        {
            throw new IllegalArgumentException("wrong sequence size in constructor: " + sequence.size());
        }

        this.encryptionInfoType = ASN1ObjectIdentifier.getInstance(sequence.getObjectAt(0));
        this.encryptionInfoValue = sequence.getObjectAt(1);
    }

    public EncryptionInfo(ASN1ObjectIdentifier encryptionInfoType,
                          ASN1Encodable encryptionInfoValue)
    {
        this.encryptionInfoType = encryptionInfoType;
        this.encryptionInfoValue = encryptionInfoValue;
    }

    public ASN1ObjectIdentifier getEncryptionInfoType()
    {
        return encryptionInfoType;
    }

    public ASN1Encodable getEncryptionInfoValue()
    {
        return encryptionInfoValue;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(2);
        v.add(encryptionInfoType);
        v.add(encryptionInfoValue);

        return new DLSequence(v);
    }
}