Class AlgorithmIdentifier

java.lang.Object

zeroecho.pkix.AlgorithmIdentifier

public final class AlgorithmIdentifier
extends Object

Provider-independent X.509 AlgorithmIdentifier (RFC 5280): an OID with an exactly-typed parameter form.

This is a canonical value type. It never depends on a concrete cryptographic toolkit; it captures precisely how the algorithm parameters are encoded so that a backend can reproduce the exact DER form:

• AlgorithmIdentifier.ParameterForm.ABSENT — no parameters field is present;
• AlgorithmIdentifier.ParameterForm.DER_NULL — the parameters field is DER NULL;
• AlgorithmIdentifier.ParameterForm.EXACT_DER — the parameters field is the exact canonical DER carried by parameters().

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	AlgorithmIdentifier.ParameterForm	Encoding form of the optional parameters field.

Method Summary

Modifier and Type	Method	Description
static AlgorithmIdentifier	absent(String oid)	Creates an identifier with no parameters field.
static AlgorithmIdentifier	derNull(String oid)	Creates an identifier whose parameters field is DER NULL.
boolean	equals(Object other)
static AlgorithmIdentifier	exact(String oid, byte[] derParameters)	Creates an identifier whose parameters field is exact canonical DER.
int	hashCode()
String	oid()	Returns the dotted-decimal object identifier.
AlgorithmIdentifier.ParameterForm	parameterForm()	Returns the parameter encoding form.
byte[]	parameters()	Returns a copy of the exact DER parameters, or null unless the form is AlgorithmIdentifier.ParameterForm.EXACT_DER.
String	toString()

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Details

absent

public static AlgorithmIdentifier absent(String oid)

Creates an identifier with no parameters field.

Parameters:

oid - dotted-decimal object identifier

Returns:

identifier with an absent parameter field

derNull

public static AlgorithmIdentifier derNull(String oid)

Creates an identifier whose parameters field is DER NULL.

Parameters:

oid - dotted-decimal object identifier

Returns:

identifier with a DER NULL parameter field

exact

public static AlgorithmIdentifier exact(String oid,
 byte[] derParameters)

Creates an identifier whose parameters field is exact canonical DER.

Parameters:

oid - dotted-decimal object identifier

derParameters - exact DER encoding of the parameters field

Returns:

identifier with an exact-DER parameter field

oid

public String oid()

Returns the dotted-decimal object identifier.

Returns:

the OID

parameterForm

public AlgorithmIdentifier.ParameterForm parameterForm()

Returns the parameter encoding form.

Returns:

the parameter form

parameters

public byte[] parameters()

Returns a copy of the exact DER parameters, or null unless the form is AlgorithmIdentifier.ParameterForm.EXACT_DER.

Returns:

a defensive copy of the parameter DER, or null

equals

public boolean equals(Object other)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object