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java.lang.Object | +--is.logi.crypto.Crypto | +--is.logi.crypto.keys.K | +--is.logi.crypto.keys.SymmetricKey | +--is.logi.crypto.keys.DESKey
This is the class for Data Encryption Standard (DES) keys. DES is the most widely used block cipher, although it is nowadays normally used repeatedly for each piece of plain-text and is called triple-DES. This is because the 56-bit key-size of the normal DES is too small to offer complete security.
The CDS for a DES key is DESKey(key)
with key
a string of 16 hexadecimal digits to create a specific key
or DESKey(?)
for a random DESKey object.
TriDESKey
Fields inherited from class is.logi.crypto.Crypto |
BIT,
cdsPath,
keySource,
NIBBLE,
primeCertainty,
random |
Constructor Summary | |
DESKey()
Create a new random DES key. |
|
DESKey(byte[] key)
Create a new DES key with the key bits from key[0..7] . |
|
DESKey(long key)
Create a new DES key with the key bits from key . |
Method Summary | |
int |
cipherBlockSize()
The block-size for the DES cipher is 8 bytes. |
void |
decrypt(byte[] source,
int i,
byte[] dest,
int j)
Decrypt one block of data. |
void |
encrypt(byte[] source,
int i,
byte[] dest,
int j)
Encrypt one block of data. |
boolean |
equals(java.lang.Object o)
Return true iff the two keys are equivalent. |
java.lang.String |
getAlgorithm()
The name of the algorithm is "DES". |
byte[] |
getKey()
Return the key-bits for this key as an array of 8 bytes. |
int |
getSize()
The key-size for the DES cipher is 56 bits. |
static DESKey |
parseCDS(java.lang.String key)
If "DESKey( key )" is a valid CDS for a DESKey, then DESKey.parseCDS(key) will return the described DESKey object. |
int |
plainBlockSize()
The block-size for the DES cipher is 8 bytes. |
java.lang.String |
toString()
Return a CDS for this key. |
Methods inherited from class is.logi.crypto.keys.SymmetricKey |
isPrivate,
matches |
Methods inherited from class is.logi.crypto.keys.K |
getFingerprint,
hashCode,
matchFingerprint |
Methods inherited from class is.logi.crypto.Crypto |
binString,
binString,
equal,
equalRelaxed,
equalSub,
fromHexNibble,
fromHexString,
fromString,
fromString,
hexString,
hexString,
hexString,
hexString,
makeClass,
makeInt,
makeLong,
makeSessionKey,
pastSpace,
pickBits,
pickBits,
readInt,
writeBytes,
writeBytes,
writeInt |
Methods inherited from class java.lang.Object |
getClass,
notify,
notifyAll,
wait,
wait,
wait |
Constructor Detail |
public DESKey()
public DESKey(byte[] key)
key[0..7]
.public DESKey(long key)
key
.Method Detail |
public static DESKey parseCDS(java.lang.String key) throws InvalidCDSException
A valid CDS can be created by calling the DESKey.toString() method.
Crypto.fromString(String)
public int plainBlockSize()
public int cipherBlockSize()
public int getSize()
public java.lang.String getAlgorithm()
public boolean equals(java.lang.Object o)
public byte[] getKey()
public java.lang.String toString()
Crypto.fromString(java.io.Reader)
public void encrypt(byte[] source, int i, byte[] dest, int j)
source[i..i+7]
and ciphertext is written to
dest[i..i+7]
public void decrypt(byte[] source, int i, byte[] dest, int j)
dest[i..i+7]
and plaintext is written to
source[j..j+7]
.
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