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java.lang.Objectnet.rim.device.api.crypto.CAST128DecryptorEngine
public final class CAST128DecryptorEngine
Creates a CAST 128 decryption engine. The CAST algorithm was designed by Carlisle Adams and Stafford Tavares. This version of CAST has a 128 bit key and a 64 bit block size.
This cipher is available worldwide on a royalty-free basis for commercial and non-commercial use.
For more information please refer to RFC 2144.
(@link CAST128Key More information on the key used in this engine.)
Field Summary | ||
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static int |
BLOCK_LENGTH
Represents the block length of the cipher in bytes, namely 8 bytes. |
Constructor Summary | ||
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CAST128DecryptorEngine(CAST128Key key)
Creates a CAST128DecryptorEngine object based on a given CAST128 key. |
Method Summary | ||
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void |
decrypt(byte[] ciphertext,
int ciphertextOffset,
byte[] plaintext,
int plaintextOffset)
Decodes a block of the given ciphertext into a block of plaintext. |
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String |
getAlgorithm()
Returns the name of the algorithm used, ie "CAST128". |
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int |
getBlockLength()
Returns the block length of the block cipher in bytes. |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final int BLOCK_LENGTH
Constructor Detail |
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public CAST128DecryptorEngine(CAST128Key key) throws CryptoTokenException, CryptoUnsupportedOperationException
CAST128DecryptorEngine
object based on a given CAST128 key.
key
- A CAST128 key containing the key material that will be used for decryption.
CryptoTokenException
- Thrown when a problem occurs with a crypto
token or the crypto token is invalid.
CryptoUnsupportedOperationException
- Thrown if a call is made to
an unsupported operation.Method Detail |
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public String getAlgorithm()
This method will always return the string "CAST128".
getAlgorithm
in interface BlockDecryptorEngine
public int getBlockLength()
BlockDecryptorEngine
getBlockLength
in interface BlockDecryptorEngine
public void decrypt(byte[] ciphertext, int ciphertextOffset, byte[] plaintext, int plaintextOffset) throws CryptoTokenException
BlockDecryptorEngine
decrypt
in interface BlockDecryptorEngine
ciphertext
- A byte array containing the input that is to be decrypted.ciphertextOffset
- The starting offset, or initial byte position, of the data within the input array.plaintext
- A byte array containing the output from the method.plaintextOffset
- The starting offset, or initial byte position, of
the data within the output array.
CryptoTokenException
- Thrown when an error occurs with the crypto
token or the crypto token is invalid.
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