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Class cryptix.security.BlockCipher
java.lang.Object
|
+----cryptix.security.BlockCipher
- public abstract class BlockCipher
- extends Object
Note: BlockCipher is deprecated.
This is an abstract superclass for ciphers that encrypt and decrypt a
fixed length block with a secret key.
BlockCipher objects support only the Cryptix v2.2 API.
Note: compatibility with Cryptix 2.2 applies only to clients of this
class. Subclasses must be rewritten as JCE algorithms.
Copyright © 1997
Systemics Ltd on behalf of the
Cryptix Development Team.
All rights reserved.
$Revision: 1.4 $
- Author:
- Systemics Ltd, David Hopwood, Raif S. Naffah
- See Also:
- Cipher
-
blockSize
- The algorithm's block size in bytes.
-
cipher
- The JCE cipher that is delegated to.
-
BlockCipher(Cipher, byte[])
- Constructs a V2.2 block cipher from a JCE cipher.
-
blockLength()
- Returns the block size of this cipher.
Deprecated.
-
decrypt(byte[])
- Decrypts an array of data in place.
Deprecated.
-
decrypt(byte[], byte[])
- Decrypts a block of data.
Deprecated.
-
decrypt(byte[], int, byte[], int)
- Decrypts a block of data within an array.
Deprecated.
-
encrypt(byte[])
- Encrypts a block of data in place.
Deprecated.
-
encrypt(byte[], byte[])
- Encrypts a block of data.
Deprecated.
-
encrypt(byte[], int, byte[], int)
- Encrypts a block of data within an array.
Deprecated.
-
keyLength()
- Returns the key length for this cipher.
Deprecated.
cipher
protected Cipher cipher
- The JCE cipher that is delegated to.
blockSize
protected int blockSize
- The algorithm's block size in bytes.
BlockCipher
protected BlockCipher(Cipher cipher,
byte userKey[])
- Constructs a V2.2 block cipher from a JCE cipher.
- Parameters:
- cipher - the java.security.Cipher object.
blockLength
public final int blockLength()
- Note: blockLength() is deprecated.
Use
blockSize()
,
getPlaintextBlockSize()
or
getCiphertextBlockSize()
instead.
- Returns the block size of this cipher.
- Returns:
- the block size (in bytes) of this cipher.
keyLength
public final int keyLength()
- Note: keyLength() is deprecated.
- Returns the key length for this cipher.
The JCE equivalent is to call getEncoded()
on the Key
object, and find the length of the resulting byte array. It is not
possible to directly get the key object that has been used to
initialize a Cipher.
- Returns:
- the key length (in bytes) of this cipher.
encrypt
public final void encrypt(byte buf[])
- Note: encrypt() is deprecated.
Use
initEncrypt(key)
and
update(buf, 0, buf.length, text, 0)
instead.
- Encrypts a block of data in place.
The plaintext in buf is encrypted and written back as
ciphertext.
buf.length
must be equal to the block size.
- Parameters:
- buf - the buffer holding the data
- Throws: CryptoError
- if the buffer was the wrong length
encrypt
public final void encrypt(byte in[],
byte out[])
- Note: encrypt() is deprecated.
Use
initEncrypt(key)
and
update(in, 0, in.length, out, 0)
instead.
- Encrypts a block of data.
The plaintext in in is encrypted and the ciphertext is written
into out.
Note that in and out can be the same array.
in.length
and out.length
must be equal to the
block size.
- Parameters:
- in - the plaintext to be encrypted
- out - the ciphertext result of the encryption
- Throws: CryptoError
- if a buffer was the wrong length
encrypt
public void encrypt(byte in[],
int inOffset,
byte out[],
int outOffset)
- Note: encrypt() is deprecated.
Use
initEncrypt(key)
and update(in, inOffset,
blockSize, out, outOffset)
instead.
- Encrypts a block of data within an array.
The plaintext in
in[inOffset..inOffset+blockSize-1]
is encrypted, and the resulting ciphertext is written to
out[outOffset..outOffset+blockSize-1]
.
Note that there must be sufficient bytes left in each array.
The in and out arrays can be the same, in which
case the behaviour is the same as if the input array was copied
before any output is written.
- Parameters:
- in - buffer holding the plaintext to be encrypted
- inOffset - the start of plaintext within
in
- out - buffer to write the encrypted ciphertext to
- outOffset - the start of ciphertext within
out
- Throws: ArrayIndexOutOfBoundsException
- if an offset was invalid.
decrypt
public final void decrypt(byte text[])
- Note: decrypt() is deprecated.
Use
initDecrypt(key)
and
update(buf, 0, buf.length, text, 0)
instead.
- Decrypts an array of data in place.
The ciphertext in buf is decrypted and written back as
plaintext.
buf.length
must be equal to the block size.
- Parameters:
- buf - the buffer holding the data
- Throws: CryptoError
- if the buffer was the wrong length
decrypt
public final void decrypt(byte in[],
byte out[])
- Note: decrypt() is deprecated.
Use
initDecrypt(key)
and
update(in, 0, in.length, out, 0)
instead.
- Decrypts a block of data.
The ciphertext in in is decrypted and the plaintext is written
into out.
Note that in and out can be the same array.
in.length
and out.length
must be equal to the
block size.
- Parameters:
- in - the plaintext to be encrypted
- out - the ciphertext result of the encryption
- Throws: CryptoError
- if a buffer was the wrong length
decrypt
public void decrypt(byte in[],
int inOffset,
byte out[],
int outOffset)
- Note: decrypt() is deprecated.
Use
initDecrypt(key)
and update(in, inOffset,
blockSize, out, outOffset)
instead.
- Decrypts a block of data within an array.
The ciphertext in
in[inOffset..inOffset+blockSize-1]
is decrypted, and the resulting plaintext is written to
out[outOffset..outOffset+blockSize-1]
.
Note that there must be sufficient bytes left in each array.
The in and out arrays can be the same, in which
case the behaviour is the same as if the input array was copied
before any output is written.
- Parameters:
- in - buffer holding the ciphertext to be decrypted
- inOffset - the start of ciphertext within
in
- out - buffer to write the decrypted plaintext to
- outOffset - the start of plaintext within
out
- Throws: ArrayIndexOutOfBoundsException
- if an offset was invalid.
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