| 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; |
| |
| /** |
| * <a href="http://tools.ietf.org/html/rfc5652#section-6.2.2">RFC 5652</a>: |
| * Content encryption key delivery mechanisms. |
| * <p> |
| * <pre> |
| * KeyAgreeRecipientInfo ::= SEQUENCE { |
| * version CMSVersion, -- always set to 3 |
| * originator [0] EXPLICIT OriginatorIdentifierOrKey, |
| * ukm [1] EXPLICIT UserKeyingMaterial OPTIONAL, |
| * keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier, |
| * recipientEncryptedKeys RecipientEncryptedKeys |
| * } |
| * |
| * UserKeyingMaterial ::= OCTET STRING |
| * </pre> |
| */ |
| public class KeyAgreeRecipientInfo |
| extends ASN1Object |
| { |
| private ASN1Integer version; |
| private OriginatorIdentifierOrKey originator; |
| private ASN1OctetString ukm; |
| private AlgorithmIdentifier keyEncryptionAlgorithm; |
| private ASN1Sequence recipientEncryptedKeys; |
| |
| public KeyAgreeRecipientInfo( |
| OriginatorIdentifierOrKey originator, |
| ASN1OctetString ukm, |
| AlgorithmIdentifier keyEncryptionAlgorithm, |
| ASN1Sequence recipientEncryptedKeys) |
| { |
| this.version = new ASN1Integer(3); |
| this.originator = originator; |
| this.ukm = ukm; |
| this.keyEncryptionAlgorithm = keyEncryptionAlgorithm; |
| this.recipientEncryptedKeys = recipientEncryptedKeys; |
| } |
| |
| /** |
| * @deprecated use getInstance() |
| */ |
| public KeyAgreeRecipientInfo( |
| ASN1Sequence seq) |
| { |
| int index = 0; |
| |
| version = (ASN1Integer)seq.getObjectAt(index++); |
| originator = OriginatorIdentifierOrKey.getInstance( |
| (ASN1TaggedObject)seq.getObjectAt(index++), true); |
| |
| if (seq.getObjectAt(index) instanceof ASN1TaggedObject) |
| { |
| ukm = ASN1OctetString.getInstance( |
| (ASN1TaggedObject)seq.getObjectAt(index++), true); |
| } |
| |
| keyEncryptionAlgorithm = AlgorithmIdentifier.getInstance( |
| seq.getObjectAt(index++)); |
| |
| recipientEncryptedKeys = (ASN1Sequence)seq.getObjectAt(index++); |
| } |
| |
| /** |
| * Return a KeyAgreeRecipientInfo 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 KeyAgreeRecipientInfo getInstance( |
| ASN1TaggedObject obj, |
| boolean explicit) |
| { |
| return getInstance(ASN1Sequence.getInstance(obj, explicit)); |
| } |
| |
| /** |
| * Return a KeyAgreeRecipientInfo object from the given object. |
| * <p> |
| * Accepted inputs: |
| * <ul> |
| * <li> null → null |
| * <li> {@link KeyAgreeRecipientInfo} object |
| * <li> {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with KeyAgreeRecipientInfo structure inside |
| * </ul> |
| * |
| * @param obj the object we want converted. |
| * @exception IllegalArgumentException if the object cannot be converted. |
| */ |
| public static KeyAgreeRecipientInfo getInstance( |
| Object obj) |
| { |
| if (obj instanceof KeyAgreeRecipientInfo) |
| { |
| return (KeyAgreeRecipientInfo)obj; |
| } |
| |
| if (obj != null) |
| { |
| return new KeyAgreeRecipientInfo(ASN1Sequence.getInstance(obj)); |
| } |
| |
| return null; |
| } |
| |
| public ASN1Integer getVersion() |
| { |
| return version; |
| } |
| |
| public OriginatorIdentifierOrKey getOriginator() |
| { |
| return originator; |
| } |
| |
| public ASN1OctetString getUserKeyingMaterial() |
| { |
| return ukm; |
| } |
| |
| public AlgorithmIdentifier getKeyEncryptionAlgorithm() |
| { |
| return keyEncryptionAlgorithm; |
| } |
| |
| public ASN1Sequence getRecipientEncryptedKeys() |
| { |
| return recipientEncryptedKeys; |
| } |
| |
| /** |
| * Produce an object suitable for an ASN1OutputStream. |
| */ |
| public ASN1Primitive toASN1Primitive() |
| { |
| ASN1EncodableVector v = new ASN1EncodableVector(); |
| |
| v.add(version); |
| v.add(new DERTaggedObject(true, 0, originator)); |
| |
| if (ukm != null) |
| { |
| v.add(new DERTaggedObject(true, 1, ukm)); |
| } |
| |
| v.add(keyEncryptionAlgorithm); |
| v.add(recipientEncryptedKeys); |
| |
| return new DERSequence(v); |
| } |
| } |