anon.crypto

Class MyRSASignature

java.lang.Object

anon.crypto.MyRSASignature

All Implemented Interfaces:

IMySignature, ISignatureCreationAlgorithm, ISignatureVerificationAlgorithm

public final class MyRSASignature
extends java.lang.Object
implements IMySignature

SHA1withRSA Signature as described in RFC 2437

Constructor Summary

Constructors

Constructor and Description
MyRSASignature()

Method Summary

Modifier and Type	Method and Description
byte[]	decodeForXMLSignature(byte[] a_encodedSignature) Tries to decode a signature in a way as it would meet the W3C standard for RSA XML signature values.
byte[]	encodeForXMLSignature(byte[] a_signature) Encodes a signature in a way it meets the W3C standard for RSA XML signature values.
mybouncycastle.org.bouncycastle.asn1.x509.AlgorithmIdentifier	getIdentifier() Returns the algorithm identifier (RSA with SHA1).
java.lang.String	getXMLSignatureAlgorithmReference() Returns http://www.w3.org/2000/09/xmldsig#rsa-sha1.
void	initSign(IMyPrivateKey k) Initialises the algorithm for signing.
void	initVerify(IMyPublicKey k) Initialises the algorithm for verifying.
byte[]	sign(byte[] bytesToSign) Signs a message and returns the signature.
byte[]	signPlain(byte[] hash) Only does the signature calculation assuming that the input already is a hash
boolean	verify(byte[] a_message, byte[] a_signature) Tests if the signature of a specified message is valid.
boolean	verify(byte[] message, int message_offset, int message_len, byte[] sig, int signature_offset, int signature_len) Tests if the signature of a specified message is valid.
boolean	verifyPlain(byte[] hash, byte[] sig) Verifies a signature for a given hash

Methods inherited from class java.lang.Object

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

Constructor Detail

MyRSASignature

public MyRSASignature()

Method Detail

initVerify

public void initVerify(IMyPublicKey k)
                throws java.security.InvalidKeyException

Description copied from interface: IMySignature

Initialises the algorithm for verifying. This must be done before doing the verify operation. The general contract of this method is that it must check if the algorithm has previously been initialised with the given key. If yes the method does nothing to save resources.

Specified by:

initVerify in interface IMySignature

Parameters:

k - a public key

Throws:

java.security.InvalidKeyException - if the key is invalid

initSign

public void initSign(IMyPrivateKey k)
              throws java.security.InvalidKeyException

Description copied from interface: IMySignature

Initialises the algorithm for signing. This must be done before doing the sign operation. The general contract of this method is that it must check if the algorithm has previously been initialised with the given key. If yes the method does nothing to save resources.

Specified by:

initSign in interface IMySignature

Parameters:

k - a private key

Throws:

java.security.InvalidKeyException - if the key is invalid

verify

public boolean verify(byte[] a_message,
                      byte[] a_signature)

Description copied from interface: IMySignature

Tests if the signature of a specified message is valid.

Specified by:

verify in interface IMySignature

Specified by:

verify in interface ISignatureVerificationAlgorithm

Parameters:

a_message - a message

a_signature - a signature

Returns:

true if the signature of a specified message is valid; false otherwiese

verify

public boolean verify(byte[] message,
                      int message_offset,
                      int message_len,
                      byte[] sig,
                      int signature_offset,
                      int signature_len)

Description copied from interface: ISignatureVerificationAlgorithm

Tests if the signature of a specified message is valid.

Specified by:

verify in interface ISignatureVerificationAlgorithm

Parameters:

message - a message

message_offset - start of message

message_len - length of message

sig - a signature

signature_offset - start of signature

signature_len - length of signature

Returns:

true if the signature of a specified message is valid; false otherwiese

verifyPlain

public boolean verifyPlain(byte[] hash,
                           byte[] sig)

Verifies a signature for a given hash

sign

public byte[] sign(byte[] bytesToSign)

Description copied from interface: IMySignature

Signs a message and returns the signature.

Specified by:

sign in interface IMySignature

Specified by:

sign in interface ISignatureCreationAlgorithm

Parameters:

bytesToSign - a message

Returns:

the signature that was created

signPlain

public byte[] signPlain(byte[] hash)

Only does the signature calculation assuming that the input already is a hash

getIdentifier

public mybouncycastle.org.bouncycastle.asn1.x509.AlgorithmIdentifier getIdentifier()

Returns the algorithm identifier (RSA with SHA1).

Specified by:

getIdentifier in interface ISignatureCreationAlgorithm

Specified by:

getIdentifier in interface ISignatureVerificationAlgorithm

Returns:

the algorithm identifier (RSA with SHA1)

encodeForXMLSignature

public byte[] encodeForXMLSignature(byte[] a_signature)

Encodes a signature in a way it meets the W3C standard for RSA XML signature values. Note: No further encoding has to be done!

Specified by:

encodeForXMLSignature in interface IMySignature

Specified by:

encodeForXMLSignature in interface ISignatureCreationAlgorithm

Parameters:

a_signature - an non-encoded signature

Returns:

the encoded signature in PKCS1 format or null if an error occured

See Also:

http://tools.ietf.org/html/rfc2437#section-8.1, http://www.w3.org/TR/xmldsig-core/#sec-PKCS1

decodeForXMLSignature

public byte[] decodeForXMLSignature(byte[] a_encodedSignature)

Tries to decode a signature in a way as it would meet the W3C standard for RSA XML signature values. Note: No further decoding has to be done!

Specified by:

decodeForXMLSignature in interface IMySignature

Specified by:

decodeForXMLSignature in interface ISignatureVerificationAlgorithm

Parameters:

a_encodedSignature - an encoded signature in PKCS1 format

Returns:

the decoded signature or null if an error occured

See Also:

http://tools.ietf.org/html/rfc2437#section-8.1, http://www.w3.org/TR/xmldsig-core/#sec-PKCS1

getXMLSignatureAlgorithmReference

public java.lang.String getXMLSignatureAlgorithmReference()

Returns http://www.w3.org/2000/09/xmldsig#rsa-sha1.

Specified by:

getXMLSignatureAlgorithmReference in interface IMySignature

Specified by:

getXMLSignatureAlgorithmReference in interface ISignatureCreationAlgorithm

Specified by:

getXMLSignatureAlgorithmReference in interface ISignatureVerificationAlgorithm

Returns:

http://www.w3.org/2000/09/xmldsig#rsa-sha1

See Also:

http://www.w3.org/TR/xmldsig-core/#sec-AlgID