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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.TriDESKey
This is the class for triple-DES keys used in an EDE3 configuration. This is a variant of the standard DES cipher which increases the size of the key-space to make exhaustive key-search infeasible.
The CDS for a triple-DES key is TriDESKey(key)
with
key
a string of 48 hexadecimal digits to create a specific key
or TriDESKey(?)
for a random TriDESKey object.
DESKey
Fields inherited from class is.logi.crypto.Crypto |
BIT,
cdsPath,
keySource,
NIBBLE,
primeCertainty,
random |
Constructor Summary | |
TriDESKey()
Create a new random triple-DES key. |
|
TriDESKey(byte[] key)
Create a new triple-DES key with the key bits from key[0..23] . |
Method Summary | |
int |
cipherBlockSize()
The block-size for the triple-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 24 bytes. |
int |
getSize()
The key-size for the DES cipher is 168 bits. |
static TriDESKey |
parseCDS(java.lang.String key)
If "TriDESKey( key )" is a valid CDS for a TriDESKey, then TriDESKey.parseCDS(key) will return the described TriDESKey object. |
int |
plainBlockSize()
The block-size for the triple-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 TriDESKey()
public TriDESKey(byte[] key)
key[0..23]
.Method Detail |
public static TriDESKey parseCDS(java.lang.String key) throws InvalidCDSException
A valid CDS can be created by calling the TriDESKey.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+23]
and ciphertext is written to
dest[j..j+23]
.public void decrypt(byte[] source, int i, byte[] dest, int j)
dest[i..i+23]
and plaintext is written to
source[j..j+23]
.
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