Beispiel #1
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 /**
  * Initializes this cipher with a key and a source of randomness. The cipher is initialized for
  * one of the following four operations: encryption, decryption, key wrapping or key unwrapping,
  * depending on the value of <code>opmode</code>.
  *
  * <p>If this cipher (including its underlying feedback or padding scheme) requires any random
  * bytes, it will get them from <code>random</code>.
  *
  * @param opmode the operation mode of this cipher (this is one of the following: <code>
  *     ENCRYPT_MODE</code>, <code>DECRYPT_MODE</code>), <code>WRAP_MODE</code> or <code>
  *     UNWRAP_MODE</code>)
  * @param key the encryption key
  * @param random the source of randomness
  * @exception InvalidKeyException if the given key is inappropriate for initializing this cipher
  */
 protected void engineInit(int opmode, Key key, SecureRandom random) throws InvalidKeyException {
   try {
     core.init(opmode, key, (AlgorithmParameterSpec) null, random);
   } catch (InvalidAlgorithmParameterException ie) {
     InvalidKeyException ike = new InvalidKeyException("requires PBE parameters");
     ike.initCause(ie);
     throw ike;
   }
 }
Beispiel #2
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 /**
  * Returns the block size (in bytes).
  *
  * @return the block size (in bytes)
  */
 protected int engineGetBlockSize() {
   return core.getBlockSize();
 }
Beispiel #3
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 /**
  * Unwrap a previously wrapped key.
  *
  * @param wrappedKey the key to be unwrapped.
  * @param wrappedKeyAlgorithm the algorithm the wrapped key is for.
  * @param wrappedKeyType the type of the wrapped key. This is one of <code>Cipher.SECRET_KEY
  *     </code>, <code>Cipher.PRIVATE_KEY</code>, or <code>Cipher.PUBLIC_KEY</code>.
  * @return the unwrapped key.
  * @exception NoSuchAlgorithmException if no installed providers can create keys of type <code>
  *     wrappedKeyType</code> for the <code>wrappedKeyAlgorithm</code>.
  * @exception InvalidKeyException if <code>wrappedKey</code> does not represent a wrapped key of
  *     type <code>wrappedKeyType</code> for the <code>wrappedKeyAlgorithm</code>.
  */
 protected Key engineUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType)
     throws InvalidKeyException, NoSuchAlgorithmException {
   return core.unwrap(wrappedKey, wrappedKeyAlgorithm, wrappedKeyType);
 }
Beispiel #4
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 /**
  * Wrap a key.
  *
  * @param key the key to be wrapped.
  * @return the wrapped key.
  * @exception IllegalBlockSizeException if this cipher is a block cipher, no padding has been
  *     requested, and the length of the encoding of the key to be wrapped is not a multiple of the
  *     block size.
  * @exception InvalidKeyException if it is impossible or unsafe to wrap the key with this cipher
  *     (e.g., a hardware protected key is being passed to a software only cipher).
  */
 protected byte[] engineWrap(Key key) throws IllegalBlockSizeException, InvalidKeyException {
   return core.wrap(key);
 }
Beispiel #5
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 /**
  * Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation.
  * The data is encrypted or decrypted, depending on how this cipher was initialized.
  *
  * <p>The first <code>inputLen</code> bytes in the <code>input</code> buffer, starting at <code>
  * inputOffset</code>, and any input bytes that may have been buffered during a previous <code>
  * update</code> operation, are processed, with padding (if requested) being applied. The result
  * is stored in the <code>output</code> buffer, starting at <code>outputOffset</code>.
  *
  * <p>The cipher is reset to its initial state (uninitialized) after this call.
  *
  * @param input the input buffer
  * @param inputOffset the offset in <code>input</code> where the input starts
  * @param inputLen the input length
  * @param output the buffer for the result
  * @param outputOffset the offset in <code>output</code> where the result is stored
  * @return the number of bytes stored in <code>output</code>
  * @exception IllegalBlockSizeException if this cipher is a block cipher, no padding has been
  *     requested (only in encryption mode), and the total input length of the data processed by
  *     this cipher is not a multiple of block size
  * @exception ShortBufferException if the given output buffer is too small to hold the result
  * @exception BadPaddingException if decrypting and padding is choosen, but the last input data
  *     does not have proper padding bytes.
  */
 protected int engineDoFinal(
     byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
     throws ShortBufferException, IllegalBlockSizeException, BadPaddingException {
   return core.doFinal(input, inputOffset, inputLen, output, outputOffset);
 }
Beispiel #6
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 /**
  * Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation.
  * The data is encrypted or decrypted, depending on how this cipher was initialized.
  *
  * <p>The first <code>inputLen</code> bytes in the <code>input</code> buffer, starting at <code>
  * inputOffset</code>, and any input bytes that may have been buffered during a previous <code>
  * update</code> operation, are processed, with padding (if requested) being applied. The result
  * is stored in a new buffer.
  *
  * <p>The cipher is reset to its initial state (uninitialized) after this call.
  *
  * @param input the input buffer
  * @param inputOffset the offset in <code>input</code> where the input starts
  * @param inputLen the input length
  * @return the new buffer with the result
  * @exception IllegalBlockSizeException if this cipher is a block cipher, no padding has been
  *     requested (only in encryption mode), and the total input length of the data processed by
  *     this cipher is not a multiple of block size
  * @exception BadPaddingException if decrypting and padding is choosen, but the last input data
  *     does not have proper padding bytes.
  */
 protected byte[] engineDoFinal(byte[] input, int inputOffset, int inputLen)
     throws IllegalBlockSizeException, BadPaddingException {
   return core.doFinal(input, inputOffset, inputLen);
 }
Beispiel #7
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 /**
  * Continues a multiple-part encryption or decryption operation (depending on how this cipher was
  * initialized), processing another data part.
  *
  * <p>The first <code>inputLen</code> bytes in the <code>input</code> buffer, starting at <code>
  * inputOffset</code>, are processed, and the result is stored in the <code>output</code> buffer,
  * starting at <code>outputOffset</code>.
  *
  * @param input the input buffer
  * @param inputOffset the offset in <code>input</code> where the input starts
  * @param inputLen the input length
  * @param output the buffer for the result
  * @param outputOffset the offset in <code>output</code> where the result is stored
  * @return the number of bytes stored in <code>output</code>
  * @exception ShortBufferException if the given output buffer is too small to hold the result
  */
 protected int engineUpdate(
     byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
     throws ShortBufferException {
   return core.update(input, inputOffset, inputLen, output, outputOffset);
 }
Beispiel #8
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 /**
  * Continues a multiple-part encryption or decryption operation (depending on how this cipher was
  * initialized), processing another data part.
  *
  * <p>The first <code>inputLen</code> bytes in the <code>input</code> buffer, starting at <code>
  * inputOffset</code>, are processed, and the result is stored in a new buffer.
  *
  * @param input the input buffer
  * @param inputOffset the offset in <code>input</code> where the input starts
  * @param inputLen the input length
  * @return the new buffer with the result
  */
 protected byte[] engineUpdate(byte[] input, int inputOffset, int inputLen) {
   return core.update(input, inputOffset, inputLen);
 }
Beispiel #9
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 protected void engineInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random)
     throws InvalidKeyException, InvalidAlgorithmParameterException {
   core.init(opmode, key, params, random);
 }
Beispiel #10
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 /**
  * Returns the parameters used with this cipher.
  *
  * <p>The returned parameters may be the same that were used to initialize this cipher, or may
  * contain the default set of parameters or a set of randomly generated parameters used by the
  * underlying cipher implementation (provided that the underlying cipher implementation uses a
  * default set of parameters or creates new parameters if it needs parameters but was not
  * initialized with any).
  *
  * @return the parameters used with this cipher, or null if this cipher does not use any
  *     parameters.
  */
 protected AlgorithmParameters engineGetParameters() {
   return core.getParameters();
 }
Beispiel #11
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 /**
  * Returns the initialization vector (IV) in a new buffer.
  *
  * <p>This is useful in the case where a random IV has been created (see <a href =
  * "#init">init</a>), or in the context of password-based encryption or decryption, where the IV
  * is derived from a user-supplied password.
  *
  * @return the initialization vector in a new buffer, or null if the underlying algorithm does not
  *     use an IV, or if the IV has not yet been set.
  */
 protected byte[] engineGetIV() {
   return core.getIV();
 }
Beispiel #12
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 /**
  * Returns the length in bytes that an output buffer would need to be in order to hold the result
  * of the next <code>update</code> or <code>doFinal</code> operation, given the input length
  * <code>inputLen</code> (in bytes).
  *
  * <p>This call takes into account any unprocessed (buffered) data from a previous <code>update
  * </code> call, and padding.
  *
  * <p>The actual output length of the next <code>update</code> or <code>doFinal</code> call may be
  * smaller than the length returned by this method.
  *
  * @param inputLen the input length (in bytes)
  * @return the required output buffer size (in bytes)
  */
 protected int engineGetOutputSize(int inputLen) {
   return core.getOutputSize(inputLen);
 }