net.rim.device.api.crypto.ECNRSignatureVerifier
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java.lang.Object
public final class ECNRSignatureVerifier
Verifies an Elliptic Curve Nyberg-Rueppel (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 | ||
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ECNRSignatureVerifier(ECPublicKey key,
byte[] r,
int rOffset,
byte[] s,
int sOffset)
Constructs an ECNRSignatureVerifier object using SHA-1 for the digest. |
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ECNRSignatureVerifier(ECPublicKey key,
Digest digest,
byte[] r,
int rOffset,
byte[] s,
int sOffset)
Constructs an ECNRSignatureVerifier object using a specified
digest. |
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| Method Summary | ||
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String |
getAlgorithm()
Returns the name of the signing algorithm used, ie "ECNR/" + Digest.getAlgorithm(). |
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void |
update(byte[] data)
Adds additional message data to the signature. |
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void |
update(byte[] data,
int offset,
int length)
Adds additional message data to the signature. |
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void |
update(int data)
Adds additional message data to the signature. |
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boolean |
verify()
Returns true if the signature is valid, false otherwise. |
| Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
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public ECNRSignatureVerifier(ECPublicKey key,
byte[] r,
int rOffset,
byte[] s,
int sOffset)
throws CryptoTokenException,
CryptoUnsupportedOperationException,
InvalidSignatureEncodingException
ECNRSignatureVerifier object using SHA-1 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 |
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public String getAlgorithm()
"ECNR/" + Digest.getAlgorithm().
getAlgorithm in interface SignatureVerifierpublic void update(int data)
SignatureVerifier
update in interface SignatureVerifierdata - The byte to be hashed.public void update(byte[] data)
SignatureVerifier
update in interface SignatureVerifierdata - A byte array containing the message data to hash.
public void update(byte[] data,
int offset,
int length)
SignatureVerifier
update in interface SignatureVerifierdata - 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 SignatureVerifierCryptoTokenException - 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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