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java.lang.Object net.rim.device.api.crypto.ECNRSignatureVerifier
public final class ECNRSignatureVerifier
Verifies an Elliptic Curve NybergRueppel (ECNR) signature on a message.
Elliptic Curve cryptography is defined in various standards including P1363 and ANSI X9.42. ECNR is defined in P1363 ( we implemented the version from the draft 13 document ).
ECNRSignatureSigner
Constructor Summary  


ECNRSignatureVerifier(ECPublicKey key,
byte[] r,
int rOffset,
byte[] s,
int sOffset)
Constructs an ECNRSignatureVerifier object using SHA1 for the digest. 


ECNRSignatureVerifier(ECPublicKey key,
Digest digest,
byte[] r,
int rOffset,
byte[] s,
int sOffset)
Constructs an ECNRSignatureVerifier object using a specified
digest. 
Method Summary  


String 
getAlgorithm()
Returns the name of the signing algorithm used, ie "ECNR/" + Digest.getAlgorithm() . 

void 
update(byte[] data)
Adds additional message data to the signature. 

void 
update(byte[] data,
int offset,
int length)
Adds additional message data to the signature. 

void 
update(int data)
Adds additional message data to the signature. 

boolean 
verify()
Returns true if the signature is valid, false otherwise. 
Methods inherited from class java.lang.Object 

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

public ECNRSignatureVerifier(ECPublicKey key, byte[] r, int rOffset, byte[] s, int sOffset) throws CryptoTokenException, CryptoUnsupportedOperationException, InvalidSignatureEncodingException
ECNRSignatureVerifier
object using SHA1 for the digest.
NOTE: Also, if r
and s
point to the same buffer, then it is assumed
that the length of r and the length of s are both exactly the length of the private key.
key
 The public key to use to verify the signature.r
 The array containing the r part of the signature to verify. Note that r is an element
of the finite field that the elliptic curve is defined over.rOffset
 The offset, or start position, of the signature data within the r array.s
 The array containing the s part of the signature to verify. Note that s is an element
of the finite field that the elliptic curve is defined over.sOffset
 The offset, or start position, of the signature data
within the s array.
CryptoTokenException
 Thrown if an error occurs with the crypto
token or the crypto token is invalid.
CryptoUnsupportedOperationException
 Thrown if a call is made to
an unsupported operation.
InvalidSignatureEncodingException
public ECNRSignatureVerifier(ECPublicKey key, Digest digest, byte[] r, int rOffset, byte[] s, int sOffset) throws CryptoTokenException, CryptoUnsupportedOperationException, InvalidSignatureEncodingException
ECNRSignatureVerifier
object using a specified
digest.
NOTE: If the digest has any state information in it when it is given to the signature verifier, this information will be incorporated into the signature.
A newly created digest, which no update call has been made to, contains no state information in it by default.
NOTE: Also, if r
and s
point to the same buffer, then it is assumed
that the length of r and the length of s are both exactly the length of the private key.
key
 The public key used to verify the signature.digest
 The digest used for verification.r
 The array containing the r part of the signature to verify. Note that r is an element
of the finite field that the elliptic curve is defined over.rOffset
 The offset, or start position, of the signature data within the r array.s
 The array containing the s part of the signature to verify. Note that s is an element
of the finite field that the elliptic curve is defined over.sOffset
 The offset, or start position, of the signature data
within the s array.
CryptoTokenException
 Thrown if an error occurs with the crypto
token or the crypto token is invalid.
CryptoUnsupportedOperationException
 Thrown if a call is made to
an unsupported operation.
InvalidSignatureEncodingException
Method Detail 

public String getAlgorithm()
"ECNR/" + Digest.getAlgorithm()
.
getAlgorithm
in interface SignatureVerifier
public void update(int data)
SignatureVerifier
update
in interface SignatureVerifier
data
 The byte to be hashed.public void update(byte[] data)
SignatureVerifier
update
in interface SignatureVerifier
data
 A byte array containing the message data to hash.public void update(byte[] data, int offset, int length)
SignatureVerifier
update
in interface SignatureVerifier
data
 The message data to hash.offset
 The offset, or initial position to start reading in the data.length
 The amount of data to read.public boolean verify() throws CryptoTokenException, CryptoUnsupportedOperationException
SignatureVerifier
verify
in interface SignatureVerifier
CryptoTokenException
 Thrown when a problem occurs with a crypto
token or the crypto token is invalid.
CryptoUnsupportedOperationException
 Thrown when a call is made to
an unsupported operation.


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