opencard.opt.security
Class DSASignCredential
java.lang.Object
opencard.opt.security.DSASignCredential
- All Implemented Interfaces:
- Credential, PKACredential, SignCredential
public class DSASignCredential
- extends java.lang.Object
- implements PKACredential, SignCredential
Sample credential to perform a DSA signing operation.
This credential does not hash a message nor pad input blocks which are too small.
It only accepts data which matches the key's input length and performs the
raw DSA algorithm.
This credential can be used for external authentication.
- See Also:
PKACredential
,
SignCredential
Field Summary |
protected java.security.Signature |
JCAsignature
|
protected java.security.interfaces.DSAPrivateKey |
privKey
|
Constructor Summary |
DSASignCredential(java.security.interfaces.DSAPrivateKey privateKey)
Constructor using a DSA private key |
Method Summary |
int |
getInputLength()
Return the input length that the cryptographic algorithm can process. |
byte[] |
sign(byte[] data)
Compute a signature over a block of data. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
privKey
protected java.security.interfaces.DSAPrivateKey privKey
JCAsignature
protected java.security.Signature JCAsignature
DSASignCredential
public DSASignCredential(java.security.interfaces.DSAPrivateKey privateKey)
- Constructor using a DSA private key
sign
public byte[] sign(byte[] data)
throws OpenCardRuntimeException
- Compute a signature over a block of data.
- Specified by:
sign
in interface SignCredential
- Parameters:
data
- Data to be signed. Must have length
getInputLength().
- Returns:
- the signature/cryptogram
- Throws:
OpenCardRuntimeException
- Invalid input block length or invalid key.
getInputLength
public int getInputLength()
- Description copied from interface:
SignCredential
- Return the input length that the cryptographic algorithm can process.
- Specified by:
getInputLength
in interface SignCredential
- Returns:
- int