com.nimbusds.jose.crypto
Class RSASSAVerifier

java.lang.Object
  com.nimbusds.jose.crypto.RSASSAVerifier

All Implemented Interfaces:

JWSAlgorithmProvider, JWSVerifier

@ThreadSafe
public class RSASSAVerifier
extends Object
implements JWSVerifier

RSA Signature-Scheme-with-Appendix (RSASSA) verifier of JWS objects. This class is thread-safe.

Supports the following JSON Web Algorithms (JWAs):

• JWSAlgorithm.RS256
• JWSAlgorithm.RS384
• JWSAlgorithm.RS512

Accepts the following JWS header parameters:

• alg
• typ
• cty

Version:

$version$ (2012-10-23)

Author:

Vladimir Dzhuvinov

Field Summary

static Set<JWSAlgorithm>

SUPPORTED_ALGORITHMS The supported JWS algorithms.

Constructor Summary

RSASSAVerifier(RSAPublicKey publicKey)
Creates a new RSA Signature-Scheme-with-Appendix (RSASSA) verifier.

Method Summary

JWSHeaderFilter	getJWSHeaderFilter() Gets the JWS header filter associated with the verifier.
RSAPublicKey	getPublicKey() Gets the public RSA key.
protected static Signature	getRSASignerAndVerifier(JWSAlgorithm alg) Gets an RSA signer and verifier for the specified RSASSA-based JSON Web Algorithm (JWA).
Set<JWSAlgorithm>	supportedAlgorithms() Returns the names of the supported JWS algorithms.
boolean	verify(ReadOnlyJWSHeader header, byte[] signedContent, Base64URL signature) Verifies the specified signature of a JWS object.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.nimbusds.jose.JWSAlgorithmProvider

supportedAlgorithms

Field Detail

SUPPORTED_ALGORITHMS

public static final Set<JWSAlgorithm> SUPPORTED_ALGORITHMS

The supported JWS algorithms.

Constructor Detail

RSASSAVerifier

public RSASSAVerifier(RSAPublicKey publicKey)

Creates a new RSA Signature-Scheme-with-Appendix (RSASSA) verifier.

Parameters:

publicKey - The public RSA key. Must not be null.

Method Detail

getPublicKey

public RSAPublicKey getPublicKey()

Gets the public RSA key.

Returns:

The public RSA key.

getJWSHeaderFilter

public JWSHeaderFilter getJWSHeaderFilter()

Description copied from interface: JWSVerifier

Gets the JWS header filter associated with the verifier. Specifies the names of those supported JWS algorithms and header parameters that the verifier is configured to accept.

Attempting to verify a JWS object signature with an algorithm or header parameter that is not accepted must result in a JOSEException.

Specified by:

getJWSHeaderFilter in interface JWSVerifier

Returns:

The JWS header filter.

verify

public boolean verify(ReadOnlyJWSHeader header,
                      byte[] signedContent,
                      Base64URL signature)
               throws JOSEException

Description copied from interface: JWSVerifier

Verifies the specified signature of a JWS object.

Specified by:

verify in interface JWSVerifier

Parameters:

header - The JSON Web Signature (JWS) header. Must specify an accepted JWS algorithm, must contain only accepted header parameters, and must not be null.

signedContent - The signed content. Must not be null.

signature - The signature part of the JWS object. Must not be null.

Returns:

true if the signature was successfully verified, else false.

Throws:

JOSEException - If the JWS algorithm is not accepted, if a header parameter is not accepted, or if signature verification failed for some other reason.

getRSASignerAndVerifier

protected static Signature getRSASignerAndVerifier(JWSAlgorithm alg)
                                            throws JOSEException

Gets an RSA signer and verifier for the specified RSASSA-based JSON Web Algorithm (JWA).

Parameters:

alg - The JSON Web Algorithm (JWA). Must be supported and not null.

Returns:

An RSA signer and verifier instance.

Throws:

JOSEException - If the algorithm is not supported.

supportedAlgorithms

public Set<JWSAlgorithm> supportedAlgorithms()

Description copied from interface: JWSAlgorithmProvider

Returns the names of the supported JWS algorithms. These correspond to the alg JWS header parameter.

Specified by:

supportedAlgorithms in interface JWSAlgorithmProvider

Returns:

The supported JWS algorithms, empty set if none.