DSAPublicKey

Overview  Package   Class  Use  Tree  Deprecated  Index  Help 
 PREV CLASS   NEXT CLASS FRAMES    NO FRAMES    
SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD

javacard.security
Interface DSAPublicKey

All Superinterfaces:
DSAKey, Key, PublicKey
All Known Implementing Classes:
DSAPublicKeyImpl
public interface DSAPublicKey
extends PublicKey, DSAKey

The DSAPublicKey interface is used to verify signatures on signed data using the DSA algorithm. An implementation of DSAPublicKey interface must also implement the DSAKey interface methods.

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

See Also:
DSAPrivateKey, KeyBuilder, Signature, KeyEncryption

Method Summary
 short getY(byte[] buffer, short offset)
          Returns the value of the key in plain text.
 void setY(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

setY

void setY(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.

Parameters:
buffer - the input buffer
offset - the offset into the input buffer at which the key value begins
length - the length of the key value
Throws:
CryptoException - with the following reason code:
  • CryptoException.ILLEGAL_VALUE if the input key data length is inconsistent with the implementation or if input data decryption is required and fails.

getY

short getY(byte[] buffer,
           short offset)
           throws CryptoException
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).

Parameters:
buffer - the output buffer
offset - the offset into the input buffer at which the key value starts
Returns:
the byte length of the key value returned
Throws:
CryptoException - with the following reason code:
  • CryptoException.UNINITIALIZED_KEY if the value of the key has not been successfully initialized since the time the initialized state of the key was set to false.
See Also:
Key
Overview  Package   Class  Use  Tree  Deprecated  Index  Help 
 
 PREV CLASS   NEXT CLASS FRAMES    NO FRAMES    
SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD