org.bouncycastle.operator

Class DefaultDigestAlgorithmIdentifierFinder

java.lang.Object

org.bouncycastle.operator.DefaultDigestAlgorithmIdentifierFinder

All Implemented Interfaces:

DigestAlgorithmIdentifierFinder

public class DefaultDigestAlgorithmIdentifierFinder
extends java.lang.Object
implements DigestAlgorithmIdentifierFinder

Default implementation of DigestAlgorithmIdentifierFinder, returning the AlgorithmIdentifier that names a digest in the contexts where this finder is used by CMS / S/MIME / PKIX operator builders.

Parameter-field convention: SHA-2 and SHA-3 digest identifiers are produced with the parameters field absent, per RFC 5754 §2: "Implementations MUST generate SHA2 AlgorithmIdentifiers with absent parameters." SHA-1 keeps NULL parameters (RFC 3370). Old algorithms with historic NULL-parameter conventions (MD2 / MD4 / MD5, GOST R 34.11-94) follow their own RFCs.

This is a different convention from DefaultSignatureAlgorithmIdentifierFinder, which when building RSASSA-PSS-params emits the SHA-2 / SHA-3 hash sub-identifier with NULL parameters per RFC 4055 §2.1 (sha256Identifier ::= { id-sha256, NULL } etc.). Both forms are standards-compliant in their respective slots; a single CMS SignedData carrying an RSA-PSS SignerInfo will validly contain the same SHA-2 OID twice, once with absent parameters (in digestAlgorithm) and once with NULL parameters (inside the PSS parameter structure). Receiver-side AlgorithmIdentifier.equals() on the two encodings returns false but both are accepted by RFC 5754 §2 and by other mainstream verifiers (OpenSSL, the JDK providers, GnuTLS).

Field Summary

Fields

Modifier and Type	Field and Description
static DigestAlgorithmIdentifierFinder	INSTANCE

Constructor Summary

Constructors

Constructor and Description
DefaultDigestAlgorithmIdentifierFinder()

Method Summary

Modifier and Type	Method and Description
org.bouncycastle.asn1.x509.AlgorithmIdentifier	find(org.bouncycastle.asn1.x509.AlgorithmIdentifier sigAlgId) Find the digest algorithm identifier that matches with the passed in signature algorithm identifier.
org.bouncycastle.asn1.x509.AlgorithmIdentifier	find(org.bouncycastle.asn1.ASN1ObjectIdentifier digAlgOid) Find the algorithm identifier that matches with the passed in digest OID.
org.bouncycastle.asn1.x509.AlgorithmIdentifier	find(java.lang.String digAlgName) Find the algorithm identifier that matches with the passed in digest name.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static DigestAlgorithmIdentifierFinder INSTANCE

Constructor Detail

DefaultDigestAlgorithmIdentifierFinder

public DefaultDigestAlgorithmIdentifierFinder()

Method Detail

find

public org.bouncycastle.asn1.x509.AlgorithmIdentifier find(org.bouncycastle.asn1.x509.AlgorithmIdentifier sigAlgId)

Description copied from interface: DigestAlgorithmIdentifierFinder

Find the digest algorithm identifier that matches with the passed in signature algorithm identifier.

Specified by:

find in interface DigestAlgorithmIdentifierFinder

Parameters:

sigAlgId - the signature algorithm of interest.

Returns:

an algorithm identifier for the corresponding digest.

find

public org.bouncycastle.asn1.x509.AlgorithmIdentifier find(org.bouncycastle.asn1.ASN1ObjectIdentifier digAlgOid)

Description copied from interface: DigestAlgorithmIdentifierFinder

Find the algorithm identifier that matches with the passed in digest OID.

Specified by:

find in interface DigestAlgorithmIdentifierFinder

Parameters:

digAlgOid - the OID of the digest algorithm of interest.

Returns:

an algorithm identifier for the digest signature.

find

public org.bouncycastle.asn1.x509.AlgorithmIdentifier find(java.lang.String digAlgName)

Description copied from interface: DigestAlgorithmIdentifierFinder

Find the algorithm identifier that matches with the passed in digest name.

Specified by:

find in interface DigestAlgorithmIdentifierFinder

Parameters:

digAlgName - the name of the digest algorithm of interest.

Returns:

an algorithm identifier for the digest signature.