diff options
Diffstat (limited to 'libraries/spongycastle/jce/src/main/java/javax/crypto/NullCipher.java')
| -rw-r--r-- | libraries/spongycastle/jce/src/main/java/javax/crypto/NullCipher.java | 240 |
1 files changed, 0 insertions, 240 deletions
diff --git a/libraries/spongycastle/jce/src/main/java/javax/crypto/NullCipher.java b/libraries/spongycastle/jce/src/main/java/javax/crypto/NullCipher.java deleted file mode 100644 index bb1ac7560..000000000 --- a/libraries/spongycastle/jce/src/main/java/javax/crypto/NullCipher.java +++ /dev/null @@ -1,240 +0,0 @@ -package javax.crypto; - -import java.security.Key; -import java.security.SecureRandom; -import java.security.InvalidKeyException; -import java.security.AlgorithmParameters; -import java.security.NoSuchAlgorithmException; -import java.security.InvalidAlgorithmParameterException; -import java.security.spec.AlgorithmParameterSpec; - -/** - * The NullCipher class is a class that provides an - * "identity cipher" -- one that does not tranform the plaintext. As - * a consequence, the ciphertext is identical to the plaintext. All - * initialization methods do nothing, while the blocksize is set to 1 - * byte. - * - * @since JCE1.2 - */ -public class NullCipher - extends Cipher -{ - static private class NullCipherSpi - extends CipherSpi - { - /** - * Sets the mode of this cipher - no op. - */ - protected void engineSetMode( - String mode) - throws NoSuchAlgorithmException - { - } - - /** - * Sets the padding mechanism of this cipher - no op. - */ - protected void engineSetPadding( - String padding) - throws NoSuchPaddingException - { - } - - /** - * Returns the block size (in bytes) - 1 - */ - protected int engineGetBlockSize() - { - return 1; - } - - /** - * 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). - * - * @param inputLen the input length (in bytes) - * @return the required output buffer size (in bytes) - */ - protected int engineGetOutputSize( - int inputLen) - { - return inputLen; - } - - /** - * Returns the initialization vector (IV) in a new buffer. - * - * @return null - */ - protected byte[] engineGetIV() - { - return null; - } - - /** - * Returns the parameters used with this cipher - null - */ - protected AlgorithmParameters engineGetParameters() - { - return null; - } - - /** - * Initializes this cipher with a key and a source - * of randomness - no op. - */ - protected void engineInit( - int opmode, - Key key, - SecureRandom random) - throws InvalidKeyException - { - } - - /** - * Initializes this cipher with a key, a set of - * algorithm parameters, and a source of randomness - no op. - */ - protected void engineInit( - int opmode, - Key key, - AlgorithmParameterSpec params, - SecureRandom random) - throws InvalidKeyException, InvalidAlgorithmParameterException - { - } - - /** - * Initializes this cipher with a key, a set of - * algorithm parameters, and a source of randomness - no op. - */ - protected void engineInit( - int opmode, - Key key, - AlgorithmParameters params, - SecureRandom random) - throws InvalidKeyException, InvalidAlgorithmParameterException - { - } - - /** - * Continues a multiple-part encryption or decryption operation - * (depending on how this cipher was initialized), processing another data - * part - in this case just return a copy of the input. - */ - protected byte[] engineUpdate( - byte[] input, - int inputOffset, - int inputLen) - { - if (input == null) - { - return null; - } - - byte[] tmp = new byte[inputLen]; - - System.arraycopy(input, inputOffset, tmp, 0, inputLen); - - return tmp; - } - - /** - * Continues a multiple-part encryption or decryption operation - * (depending on how this cipher was initialized), processing another data - * part - in this case just copy the input to the output. - */ - protected int engineUpdate( - byte[] input, - int inputOffset, - int inputLen, - byte[] output, - int outputOffset) - throws ShortBufferException - { - if (input == null) - { - return 0; - } - - if ((output.length - outputOffset) < inputLen) - { - throw new ShortBufferException("output buffer to short for NullCipher"); - } - - System.arraycopy(input, inputOffset, output, outputOffset, inputLen); - - return inputLen; - } - - /** - * 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 - * - in this case just return a copy of the input. - */ - protected byte[] engineDoFinal( - byte[] input, - int inputOffset, - int inputLen) - throws IllegalBlockSizeException, BadPaddingException - { - if (input == null) - { - return new byte[0]; - } - - byte[] tmp = new byte[inputLen]; - - System.arraycopy(input, inputOffset, tmp, 0, inputLen); - - return tmp; - } - - /** - * 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. - */ - protected int engineDoFinal( - byte[] input, - int inputOffset, - int inputLen, - byte[] output, - int outputOffset) - throws ShortBufferException, IllegalBlockSizeException, BadPaddingException - { - if (input == null) - { - return 0; - } - - if ((output.length - outputOffset) < inputLen) - { - throw new ShortBufferException("output buffer too short for NullCipher"); - } - - System.arraycopy(input, inputOffset, output, outputOffset, inputLen); - - return inputLen; - } - - /** - * Returns the key size of the given key object - 0 - */ - protected int engineGetKeySize( - Key key) - throws InvalidKeyException - { - return 0; - } - } - - public NullCipher() - { - super(new NullCipherSpi(), null, "NULL"); - } -} |