javacard.security
Interface DSAPrivateKey

All Superinterfaces:

DSAKey, Key, PrivateKey

public interface DSAPrivateKey

extends PrivateKey, DSAKey

The DSAPrivateKey interface is used to sign data using the DSA algorithm. An implementation of DSAPrivateKey interface must also implement the DSAKey interface methods.

When all four components of the key (X,P,Q,G) are set, the key is initialized and ready for use.

See Also:

DSAPublicKey

Method Summary

short	getX(byte[] buffer, short offset) Returns the value of the key in plain text.
void	setX(byte[] buffer, short offset, short length) Sets the value of the key.

Methods inherited from interface javacard.security.Key

clearKey, getSize, getType, isInitialized

Methods inherited from interface javacard.security.DSAKey

getG, getP, getQ, setG, setP, setQ

Method Detail

setX

public void setX(byte[] buffer,
                 short offset,
                 short length)
          throws CryptoException

Sets the value of the key. When the base, prime and subprime parameters are initialized and the key value is set, the key is ready for use. The plain text data format is big-endian and right-aligned (the least significant bit is the least significant bit of last byte). Input key data is copied into the internal representation.

Note:

• If the key object implements the javacardx.crypto.KeyEncryption interface and the Cipher object specified via setKeyCipher() is not null, the key value is decrypted using the Cipher object.

Throws:

CryptoException

getX

public short getX(byte[] buffer,
                  short offset)

Returns the value of the key in plain text. The data format is big-endian and right-aligned (the least significant bit is the least significant bit of last byte).