/**
* return an Integer 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.
* @throws IllegalArgumentException if the tagged object cannot be converted.
* @return an ASN1Integer instance.
*/
public static ASN1Integer getInstance(ASN1TaggedObject obj, boolean explicit) {
ASN1Primitive o = obj.getObject();
if (explicit || (o instanceof ASN1Integer)) {
return getInstance(o);
} else {
return new ASN1Integer(ASN1OctetString.getInstance(obj.getObject()).getOctets());
}
}
/**
* return an Integer 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 tagged object cannot be converted.
*/
public static DERInteger getInstance(ASN1TaggedObject obj, boolean explicit) {
DERObject o = obj.getObject();
if (explicit || o instanceof DERInteger) {
return getInstance(o);
} else {
return new ASN1Integer(ASN1OctetString.getInstance(obj.getObject()).getOctets());
}
}
/**
* Return an ASN1 sequence from a tagged object. There is a special case here, if an object
* appears to have been explicitly tagged on reading but we were expecting it to be implictly
* tagged in the normal course of events it indicates that we lost the surrounding sequence - so
* we need to add it back (this will happen if the tagged object is a sequence that contains other
* sequences). If you are dealing with implicitly tagged sequences you really <b>should</b> be
* using this method.
*
* @param obj the tagged object.
* @param explicit true if the object is meant to be explicitly tagged, false otherwise.
* @exception IllegalArgumentException if the tagged object cannot be converted.
*/
public static ASN1Sequence getInstance(ASN1TaggedObject obj, boolean explicit) {
if (explicit) {
if (!obj.isExplicit()) {
throw new IllegalArgumentException("object implicit - explicit expected.");
}
return (ASN1Sequence) obj.getObject();
} else {
//
// constructed object which appears to be explicitly tagged
// when it should be implicit means we have to add the
// surrounding sequence.
//
if (obj.isExplicit()) {
if (obj instanceof BERTaggedObject) {
return new BERSequence(obj.getObject());
} else {
return new DERSequence(obj.getObject());
}
} else {
if (obj.getObject() instanceof ASN1Sequence) {
return (ASN1Sequence) obj.getObject();
}
}
}
throw new IllegalArgumentException("unknown object in getInstanceFromTagged");
}
public static DERGeneralString getInstance(ASN1TaggedObject obj, boolean explicit) {
ASN1Primitive o = obj.getObject();
if (explicit || o instanceof DERGeneralString) {
return getInstance(o);
} else {
return new DERGeneralString(((ASN1OctetString) o).getOctets());
}
}
/**
* return a Boolean 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 tagged object cannot be converted.
*/
public static ASN1Boolean getInstance(ASN1TaggedObject obj, boolean explicit) {
ASN1Primitive o = obj.getObject();
if (explicit || o instanceof ASN1Boolean) {
return getInstance(o);
} else {
return ASN1Boolean.fromOctetString(((ASN1OctetString) o).getOctets());
}
}
public CrlID(ASN1Sequence seq) {
Enumeration e = seq.getObjects();
while (e.hasMoreElements()) {
ASN1TaggedObject o = (ASN1TaggedObject) e.nextElement();
switch (o.getTagNo()) {
case 0:
crlUrl = DERIA5String.getInstance(o, true);
break;
case 1:
crlNum = DERInteger.getInstance(o, true);
break;
case 2:
crlTime = DERGeneralizedTime.getInstance(o, true);
break;
default:
throw new IllegalArgumentException("unknown tag number: " + o.getTagNo());
}
}
}
/**
* Return an ASN1 set from a tagged object. There is a special case here, if an object appears to
* have been explicitly tagged on reading but we were expecting it to be implicitly tagged in the
* normal course of events it indicates that we lost the surrounding set - so we need to add it
* back (this will happen if the tagged object is a sequence that contains other sequences). If
* you are dealing with implicitly tagged sets you really <b>should</b> be using this method.
*
* @param obj the tagged object.
* @param explicit true if the object is meant to be explicitly tagged false otherwise.
* @exception IllegalArgumentException if the tagged object cannot be converted.
*/
public static ASN1Set getInstance(ASN1TaggedObject obj, boolean explicit) {
if (explicit) {
if (!obj.isExplicit()) {
throw new IllegalArgumentException("object implicit - explicit expected.");
}
return (ASN1Set) obj.getObject();
} else {
//
// constructed object which appears to be explicitly tagged
// and it's really implicit means we have to add the
// surrounding sequence.
//
if (obj.isExplicit()) {
ASN1Set set = new DERSet(obj.getObject());
return set;
} else {
if (obj.getObject() instanceof ASN1Set) {
return (ASN1Set) obj.getObject();
}
//
// in this case the parser returns a sequence, convert it
// into a set.
//
ASN1EncodableVector v = new ASN1EncodableVector();
if (obj.getObject() instanceof ASN1Sequence) {
ASN1Sequence s = (ASN1Sequence) obj.getObject();
Enumeration e = s.getObjects();
while (e.hasMoreElements()) {
v.add((DEREncodable) e.nextElement());
}
return new DERSet(v, false);
}
}
}
throw new IllegalArgumentException(
"unknown object in getInstance: " + obj.getClass().getName());
}
/**
* return a Generalized Time 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 tagged object cannot be converted.
*/
public static DERGeneralizedTime getInstance(ASN1TaggedObject obj, boolean explicit) {
return getInstance(obj.getObject());
}
/**
* return a BMP String 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 tagged object cannot be converted.
*/
public static DERBMPString getInstance(ASN1TaggedObject obj, boolean explicit) {
return getInstance(obj.getObject());
}
/**
* return an Object Identifier 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 tagged object cannot be converted.
*/
public static DERObjectIdentifier getInstance(ASN1TaggedObject obj, boolean explicit) {
return getInstance(obj.getObject());
}
