diff options
Diffstat (limited to 'libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/cms/KeyAgreeRecipientInfo.java')
-rw-r--r-- | libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/cms/KeyAgreeRecipientInfo.java | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/cms/KeyAgreeRecipientInfo.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/cms/KeyAgreeRecipientInfo.java new file mode 100644 index 000000000..28a1edc24 --- /dev/null +++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/asn1/cms/KeyAgreeRecipientInfo.java @@ -0,0 +1,166 @@ +package org.spongycastle.asn1.cms; + +import org.spongycastle.asn1.ASN1EncodableVector; +import org.spongycastle.asn1.ASN1Integer; +import org.spongycastle.asn1.ASN1Object; +import org.spongycastle.asn1.ASN1OctetString; +import org.spongycastle.asn1.ASN1Primitive; +import org.spongycastle.asn1.ASN1Sequence; +import org.spongycastle.asn1.ASN1TaggedObject; +import org.spongycastle.asn1.DERSequence; +import org.spongycastle.asn1.DERTaggedObject; +import org.spongycastle.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.spongycastle.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); + } +} |