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java.lang.Object | +--net.rim.device.api.crypto.InitializationVector
Represents an initialization vector (IV) for block cipher modes. The initialization vector adds randomness to the ciphertext. Thus if the same message is encrypted twice with the same key, the resulting ciphertexts will be different, as long as different initialization vectors are used.
Constructor Summary | ||
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InitializationVector(byte[] data)
Creates an InitializationVector object using the specified data. |
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InitializationVector(byte[] data,
int offset,
int length)
Creates an InitializationVector object using the specified section of the data. |
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InitializationVector(int length)
Creates an InitializationVector object with the specified number of bytes of random data. |
Method Summary | ||
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boolean |
equals(Object obj)
Indicates whether some other object is "equal to" this one. |
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byte[] |
getData()
Returns a copy of the initialization vector data. |
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int |
getLength()
Returns the length of the initialization vector in bytes. |
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int |
hashCode()
Returns a hash code value for the object. |
Methods inherited from class java.lang.Object |
getClass, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public InitializationVector(byte[] data)
InitializationVector
object using the specified data.
data
- A byte array containing the initialization vector data to use.public InitializationVector(byte[] data, int offset, int length)
InitializationVector
object using the specified section of the data.
data
- The array containing the IV data.offset
- the starting offset of the data in the array.length
- the length of data to use as the IV.public InitializationVector(int length)
InitializationVector
object with the specified number of bytes of random data.
length
- The number of bytes to use.Method Detail |
public boolean equals(Object obj)
Object
The equals
method implements an equivalence relation:
x
,
x.equals(x)
should return true
.
x
and
y
, x.equals(y)
should return
true
if and only if y.equals(x)
returns
true
.
x
,
y
, and z
, if x.equals(y)
returns true
and y.equals(z)
returns
true
, then x.equals(z)
should return
true
.
x
and y
, multiple invocations of x.equals(y)
consistently return true
or consistently return
false
, provided no information used in
equals
comparisons on the object is modified.
x
,
x.equals(null)
should return false
.
The equals method for class Object
implements
the most discriminating possible equivalence relation on objects;
that is, for any reference values x
and y
,
this method returns true
if and only if x
and
y
refer to the same object (x==y
has the
value true
).
Object
obj
- the reference object with which to compare.true
if this object is the same as the obj
argument; false
otherwise.Boolean.hashCode()
,
Hashtable
public byte[] getData()
public int getLength()
public int hashCode()
Object
java.util.Hashtable
.
The general contract of hashCode
is:
hashCode
method on each of
the two objects must produce the same integer result.
Object.equals(java.lang.Object)
method, then calling the hashCode method on each of the
two objects must produce distinct integer results. However, the
programmer should be aware that producing distinct integer results
for unequal objects may improve the performance of hashtables.
As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming language.)
Object
Object.equals(java.lang.Object)
,
Hashtable
|
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Copyright 1999-2008 Research In Motion Limited. 295 Phillip Street, Waterloo, Ontario, Canada, N2L 3W8. All Rights Reserved.
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