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## 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`, `KeyBuilder`, `Signature`, `javacardx.crypto.KeyEncryption`

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

    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.

  Parameters:
    `buffer` - the input buffer
    `offset` - the offset into the input buffer at which the modulus value begins
    `length` - the length of the modulus
  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.

### getX

    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).

  Parameters:
    `buffer` - the output buffer
    `offset` - the offset into the output 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`

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