DefaultSignatureAlgorithmIdentifierFinder (Bouncy Castle Library 1.85 API Specification)

java.lang.Object
- org.bouncycastle.operator.DefaultSignatureAlgorithmIdentifierFinder

All Implemented Interfaces:

SignatureAlgorithmIdentifierFinder
```
public class DefaultSignatureAlgorithmIdentifierFinder
extends java.lang.Object
implements SignatureAlgorithmIdentifierFinder
```
Default implementation of SignatureAlgorithmIdentifierFinder, returning the AlgorithmIdentifier (algorithm OID plus any algorithm-specific parameters) used to name a signature scheme in X.509 certificates, CMS SignedData, OCSP responses and related PKIX structures.
Parameter-field convention for RSA-PSS: when this finder builds the RSASSA-PSS-params structure for SHA*WITHRSAANDMGF1 names, the hash sub-identifier inside the hashAlgorithm field (and the inner hash inside MGF1) is emitted with NULL parameters, following RFC 4055 §2.1 which defines sha256Identifier ::= { id-sha256, NULL } (and the same pattern for SHA-1 / SHA-224 / SHA-384 / SHA-512). SHA-3 inside PSS follows the same NULL-parameter convention here for consistency.

This is a different convention from DefaultDigestAlgorithmIdentifierFinder, which (for the CMS contexts it serves) follows RFC 5754 §2 and emits SHA-2 / SHA-3 digest identifiers with the parameters field absent. Both forms are standards-compliant in their respective slots; the practical consequence is that a single CMS SignedData with a PSS SignerInfo will validly contain the same SHA-2 OID encoded both ways. See the class-level javadoc on DefaultDigestAlgorithmIdentifierFinder for the cross-reference.

Constructor Summary

Constructors
Constructor Description

DefaultSignatureAlgorithmIdentifierFinder()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`org.bouncycastle.asn1.x509.AlgorithmIdentifier`	`find(java.lang.String sigAlgName)`	Find the signature algorithm identifier that matches with the passed in signature algorithm name.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DefaultSignatureAlgorithmIdentifierFinder
```
public DefaultSignatureAlgorithmIdentifierFinder()
```
- Method Detail
  - find
```
public org.bouncycastle.asn1.x509.AlgorithmIdentifier find(java.lang.String sigAlgName)
```
    Description copied from interface: SignatureAlgorithmIdentifierFinder
    
    Find the signature algorithm identifier that matches with the passed in signature algorithm name.
    
    Specified by:
    
    find in interface SignatureAlgorithmIdentifierFinder
    
    Parameters:
    
    sigAlgName - the name of the signature algorithm of interest.
    
    Returns:
    
    an algorithm identifier for the corresponding signature.