de.uni_koblenz.aggrimm.icp.crypto.sign.algorithm.algorithm

Class SignatureAlgorithmSayers2004

java.lang.Object

de.uni_koblenz.aggrimm.icp.crypto.sign.algorithm.algorithm.SignatureAlgorithmSayers2004

All Implemented Interfaces:

SignatureAlgorithmInterface

public class SignatureAlgorithmSayers2004
extends Object
implements SignatureAlgorithmInterface

Signature Algorithm "Sayers2004" Ontology Name: sayers-2004 Based on: Sayers, C., Karp, A.H.: Computing the digest of an RDF graph. Technical report, HP Laboratories (2004)

Author:

Peter Schauß

Constructor Summary

Constructors

Constructor and Description
SignatureAlgorithmSayers2004()

Method Summary

Modifier and Type	Method and Description
void	assemble(GraphCollection gc, String signatureGraphName) Assembles a GraphCollection (add signature(s) and a signature graph).
void	canonicalize(GraphCollection gc) Canonicalizes a GraphCollection for a unique representation (commonly blank node removal/labeling and sorting).
String	getName() Gets the name of the signature algorithm (used for identification of the algorithm when signing/verifying)
void	hash(GraphCollection gc, String digestAlgo) Calculates the hash value of a GraphCollection and safes it in its SignatureData.
void	postCanonicalize(GraphCollection gc) Executes extra steps after the actual canonicalization of a GraphCollection
void	postHash(GraphCollection gc) Executes extra steps after the actual hash calculation of a GraphCollection
void	sign(GraphCollection gc, Key privateKey, String verificationCertificate) Signs GraphCollection (calculate signature(s) using a certificate/key and the hash value(s)).
boolean	verify(GraphCollection gc, Key publicKey) Verifies a signed graph collection using a public key Involves canonicalization and hashing of the graph collection and a cryptographic signature check

Methods inherited from class java.lang.Object

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

Constructor Detail

SignatureAlgorithmSayers2004

public SignatureAlgorithmSayers2004()

Method Detail

canonicalize

public void canonicalize(GraphCollection gc)
                  throws Exception

Description copied from interface: SignatureAlgorithmInterface

Canonicalizes a GraphCollection for a unique representation (commonly blank node removal/labeling and sorting). Must set SignatureData.canonicalizationMethod of SignatureData.

Specified by:

canonicalize in interface SignatureAlgorithmInterface

Parameters:

gc - graphCollection which is canonicalized

Throws:

Exception

postCanonicalize

public void postCanonicalize(GraphCollection gc)

Description copied from interface: SignatureAlgorithmInterface

Executes extra steps after the actual canonicalization of a GraphCollection

Specified by:

postCanonicalize in interface SignatureAlgorithmInterface

Parameters:

gc - graphCollection which is canonicalized

hash

public void hash(GraphCollection gc,
                 String digestAlgo)
          throws Exception

Description copied from interface: SignatureAlgorithmInterface

Calculates the hash value of a GraphCollection and safes it in its SignatureData. Must set SignatureData.graphDigestMethod and SignatureData.serializationMethod of SignatureData.

Specified by:

hash in interface SignatureAlgorithmInterface

Parameters:

gc - graphCollection which is hashed

digestAlgo - string specifying a digest algorithm

Throws:

Exception

postHash

public void postHash(GraphCollection gc)

Description copied from interface: SignatureAlgorithmInterface

Executes extra steps after the actual hash calculation of a GraphCollection

Specified by:

postHash in interface SignatureAlgorithmInterface

Parameters:

gc - graphCollection which is hashed

sign

public void sign(GraphCollection gc,
                 Key privateKey,
                 String verificationCertificate)
          throws Exception

Description copied from interface: SignatureAlgorithmInterface

Signs GraphCollection (calculate signature(s) using a certificate/key and the hash value(s)). Must set SignatureData.signatureMethod of SignatureData.

Specified by:

sign in interface SignatureAlgorithmInterface

Parameters:

gc - graphCollection which is signed

privateKey - key used to calculate the signature

verificationCertificate - string specifying the certificate which should be used for verification

Throws:

Exception

assemble

public void assemble(GraphCollection gc,
                     String signatureGraphName)
              throws Exception

Description copied from interface: SignatureAlgorithmInterface

Assembles a GraphCollection (add signature(s) and a signature graph).

Specified by:

assemble in interface SignatureAlgorithmInterface

Parameters:

gc - graphCollection which is assembled

signatureGraphName - string name for the signature graph

Throws:

Exception

verify

public boolean verify(GraphCollection gc,
                      Key publicKey)
               throws Exception

Description copied from interface: SignatureAlgorithmInterface

Verifies a signed graph collection using a public key Involves canonicalization and hashing of the graph collection and a cryptographic signature check

Specified by:

verify in interface SignatureAlgorithmInterface

Parameters:

gc - graphCollection which will be verified

publicKey - key for the cryptographic signature check

Returns:

boolean true if verification succeeded, false otherwise

Throws:

Exception

getName

public String getName()

Description copied from interface: SignatureAlgorithmInterface

Gets the name of the signature algorithm (used for identification of the algorithm when signing/verifying)

Specified by:

getName in interface SignatureAlgorithmInterface

Returns:

string name of the algorithm