Class RSASSAPSSMechanismParams

java.lang.Object

com.itextpdf.signatures.RSASSAPSSMechanismParams

All Implemented Interfaces:

IApplicableSignatureParams, ISignatureMechanismParams

public class RSASSAPSSMechanismParams
extends Object
implements IApplicableSignatureParams

Encode the signer's parameters for producing an RSASSA-PSS signature. Note that this class is intended for use in the signing process only, so it does not need to be able to represent all possible parameter configurations; only the ones we consider reasonable. For the purposes of this class, the mask generation function is always MGF1, and the associated digest function is the same as the digest function used in the signing process.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	DEFAULT_TRAILER_FIELD	Default value of the trailer field parameter.
private final IASN1ObjectIdentifier	digestAlgoOid
private static final IBouncyCastleFactory	FACTORY
private final int	saltLen
private final int	trailerField

Constructor Summary

Constructors

Constructor	Description
RSASSAPSSMechanismParams(IASN1ObjectIdentifier digestAlgoOid, int saltLen, int trailerField)	Instantiate RSASSA-PSS parameters with MGF1 for a given digest algorithm OID, salt length and trailer field value.

Method Summary

Modifier and Type	Method	Description
void	apply(Signature signature)	Apply the parameters to a Signature.
static RSASSAPSSMechanismParams	createForDigestAlgorithm(String digestAlgorithmName)	Instantiate RSASSA-PSS parameters with MGF1 for the given algorithm name.
IASN1Encodable	toEncodable()	Represent the parameters as an IASN1Encodable for inclusion in a signature object.

Methods inherited from class Object

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

Field Details

DEFAULT_TRAILER_FIELD

public static final int DEFAULT_TRAILER_FIELD

Default value of the trailer field parameter.

See Also:

• Constant Field Values

FACTORY

private static final IBouncyCastleFactory FACTORY

digestAlgoOid

private final IASN1ObjectIdentifier digestAlgoOid

saltLen

private final int saltLen

trailerField

private final int trailerField

Constructor Details

RSASSAPSSMechanismParams

public RSASSAPSSMechanismParams(IASN1ObjectIdentifier digestAlgoOid,
 int saltLen,
 int trailerField)

Instantiate RSASSA-PSS parameters with MGF1 for a given digest algorithm OID, salt length and trailer field value.

Parameters:

digestAlgoOid - the digest algorithm OID that will be used for both the digest and MGF

saltLen - the salt length

trailerField - the trailer field

Method Details

createForDigestAlgorithm

public static RSASSAPSSMechanismParams createForDigestAlgorithm(String digestAlgorithmName)

Instantiate RSASSA-PSS parameters with MGF1 for the given algorithm name.

Parameters:

digestAlgorithmName - the name of the digest algorithm

Returns:

RSASSA-PSS parameters with MGF1 for the given algorithm name.

toEncodable

public IASN1Encodable toEncodable()

Represent the parameters as an IASN1Encodable for inclusion in a signature object.

Specified by:

toEncodable in interface ISignatureMechanismParams

Returns:

an IASN1Encodable object

apply

public void apply(Signature signature)

Apply the parameters to a Signature.

Specified by:

apply in interface IApplicableSignatureParams

Parameters:

signature - an uninitialised Signature object