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java.lang.Objectjava.io.InputStream
net.rim.device.api.crypto.CryptoInputStream
net.rim.device.api.crypto.DecryptorInputStream
net.rim.device.api.crypto.StreamDecryptor
public abstract class StreamDecryptor
StreamDecryptor
is an abstract class which contains functionality
common to all stream decryptors. A stream decryptor is an decryption
scheme which decrypts data one byte at a time, instead of in blocks.
Field Summary |
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Fields inherited from class net.rim.device.api.crypto.CryptoInputStream |
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_inputStream |
Constructor Summary | ||
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StreamDecryptor(InputStream input)
Creates a StreamDecryptor object based on an input stream that contains
the encrypted data. |
Method Summary | ||
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protected abstract void |
decrypt(byte[] data,
int offset,
int length)
Decrypts data according to the specific implementation of the chosen stream cipher. |
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int |
read(byte[] data,
int offset,
int length)
Reads up to the specified number of bytes from this input stream into an array of bytes. |
Methods inherited from class net.rim.device.api.crypto.CryptoInputStream |
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available, close, getAlgorithm, getInputStream, markSupported, read, read |
Methods inherited from class java.io.InputStream |
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mark, reset, skip |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public StreamDecryptor(InputStream input)
StreamDecryptor
object based on an input stream that contains
the encrypted data.
input
- The input stream used for reading the encrypted data from.Method Detail |
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public int read(byte[] data, int offset, int length) throws IOException
CryptoInputStream
read
in class CryptoInputStream
data
- The buffer into which the data is read.offset
- The starting offset within the buffer, to store the data.length
- The maximum number of bytes to read.
IOException
- Thrown if an I/O error occurs.InputStream.read()
protected abstract void decrypt(byte[] data, int offset, int length) throws CryptoTokenException
data
- A byte array containing the input to the stream cipher.offset
- The offset, or initial position within the array, of the information to decrypt.length
- The length, in bytes, of the information to decrypt.
CryptoTokenException
- Thrown when an error occurs with the crypto
token or the crypto token is invalid.
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