net.rim.device.api.crypto.ECDSASignatureVerifier
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java.lang.Object
public final class ECDSASignatureVerifier
Verifies an ECDSA signature on a message.
Elliptic Curve cryptography is defined in various standards including P1363 and ANSI X9.62. ECDSA is specifically defined in ANSI X9.62.
ECDSASignatureSigner| Constructor Summary | ||
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ECDSASignatureVerifier(ECPublicKey key,
byte[] r,
int rOffset,
byte[] s,
int sOffset)
Constructs an ECDSASignatureVerifier object using SHA-1 for the digest. |
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ECDSASignatureVerifier(ECPublicKey key,
Digest digest,
byte[] r,
int rOffset,
byte[] s,
int sOffset)
Constructs an ECDSASignatureVerifier object. |
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| Method Summary | ||
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String |
getAlgorithm()
Returns the name of the signing algorithm used, ie "ECDSA/" +
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 ECDSASignatureVerifier(ECPublicKey key,
byte[] r,
int rOffset,
byte[] s,
int sOffset)
throws CryptoTokenException,
CryptoUnsupportedOperationException,
InvalidSignatureEncodingException
ECDSASignatureVerifier 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 for verification.r - 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 array r.s - 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 array s.
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 ECDSASignatureVerifier(ECPublicKey key,
Digest digest,
byte[] r,
int rOffset,
byte[] s,
int sOffset)
throws CryptoTokenException,
CryptoUnsupportedOperationException,
InvalidSignatureEncodingException
ECDSASignatureVerifier object.
NOTE: If the digest has any state information in it when it is given to the signature verifier, this information will be incorparated into the signature.
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 for verification.digest - The digest to use for verification.r - 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 array r.s - 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 array s.
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()
"ECDSA/" +
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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