org.bouncycastle.asn1.x509

Class AltSignatureAlgorithm

java.lang.Object

org.bouncycastle.asn1.ASN1Object

org.bouncycastle.asn1.x509.AltSignatureAlgorithm

All Implemented Interfaces:

ASN1Encodable, Encodable

public class AltSignatureAlgorithm
extends ASN1Object

X.509 Section 9.8.3.
This extension may be used as a public-key certificate extension, a CRL extension or an AVL extension. It shall contain the algorithm identifier for the alternative digital signature algorithm used by the signer when creating an alternative digital signature and by the relying party when validating the alternative digital signature.

 altSignatureAlgorithm EXTENSION ::= {
     SYNTAX AltSignatureAlgorithm
     IDENTIFIED BY id-ce-altSignatureAlgorithm }

 AltSignatureAlgorithm ::= AlgorithmIdentifier{{SupportedAlgorithms}}
 

When the altSignatureAlgorithm extension is included in a particular value that is an instance of a data type that supports extensions, the altSignatureValue extension shall also be included.
NOTE 1 – By having a separate altSignatureAlgorithm extension, instead of having it combined with the altSignatureValue extension, the alternative digital signature algorithm is protected by the alternative signature. This extension may be flagged either as critical or as non-critical.
NOTE 2 – It is recommended that it be flagged as non-critical. Flagging it as critical would require all relying parties to understand the extension and the alternative public-key algorithms

Constructor Summary

Constructors

Constructor and Description
AltSignatureAlgorithm(AlgorithmIdentifier algorithm)
AltSignatureAlgorithm(ASN1ObjectIdentifier algorithm)
AltSignatureAlgorithm(ASN1ObjectIdentifier algorithm, ASN1Encodable parameters)

Method Summary

Modifier and Type	Method and Description
static AltSignatureAlgorithm	fromExtensions(Extensions extensions)
AlgorithmIdentifier	getAlgorithm() Return the algorithm identifier representing the alternate signature algorithm used to generate the alternate signature algorithm value extension.
static AltSignatureAlgorithm	getInstance(ASN1TaggedObject obj, boolean explicit)
static AltSignatureAlgorithm	getInstance(java.lang.Object obj)
ASN1Primitive	toASN1Primitive() Method providing a primitive representation of this object suitable for encoding.

Methods inherited from class org.bouncycastle.asn1.ASN1Object

encodeTo, encodeTo, equals, getEncoded, getEncoded, hasEncodedTagValue, hashCode

Methods inherited from class java.lang.Object

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

Constructor Detail

AltSignatureAlgorithm

public AltSignatureAlgorithm(AlgorithmIdentifier algorithm)

AltSignatureAlgorithm

public AltSignatureAlgorithm(ASN1ObjectIdentifier algorithm)

AltSignatureAlgorithm

public AltSignatureAlgorithm(ASN1ObjectIdentifier algorithm,
                             ASN1Encodable parameters)

Method Detail

getInstance

public static AltSignatureAlgorithm getInstance(ASN1TaggedObject obj,
                                                boolean explicit)

getInstance

public static AltSignatureAlgorithm getInstance(java.lang.Object obj)

fromExtensions

public static AltSignatureAlgorithm fromExtensions(Extensions extensions)

getAlgorithm

public AlgorithmIdentifier getAlgorithm()

Return the algorithm identifier representing the alternate signature algorithm used to generate the alternate signature algorithm value extension.

Returns:

alternate signature algorithm identifier.

toASN1Primitive

public ASN1Primitive toASN1Primitive()

Description copied from class: ASN1Object

Method providing a primitive representation of this object suitable for encoding.

Specified by:

toASN1Primitive in interface ASN1Encodable

Specified by:

toASN1Primitive in class ASN1Object

Returns:

a primitive representation of this object.