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javax.crypto.spec
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RC5ParameterSpec (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档
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Java™ Platform Standard Ed. 6 |
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javax.crypto.spec
Class RC5ParameterSpec
java.lang.Objectjavax.crypto.spec.RC5ParameterSpec
- All Implemented Interfaces:
- AlgorithmParameterSpec
public class RC5ParameterSpec
- extends Object
- implements AlgorithmParameterSpec
- extends Object
This class specifies the parameters used with the RC5 algorithm.
The parameters consist of a version number, a rounds count, a word size, and optionally an initialization vector (IV) (only in feedback mode).
This class can be used to initialize a Cipher object that
implements the RC5 algorithm as supplied by
RSA Security Inc.,
or any parties authorized by RSA Security.
- Since:
- 1.4
| Constructor Summary | |
|---|---|
RC5ParameterSpec(int version,
int rounds,
int wordSize)
Constructs a parameter set for RC5 from the given version, number of rounds and word size (in bits). |
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RC5ParameterSpec(int version,
int rounds,
int wordSize,
byte[] iv)
Constructs a parameter set for RC5 from the given version, number of rounds, word size (in bits), and IV. |
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RC5ParameterSpec(int version,
int rounds,
int wordSize,
byte[] iv,
int offset)
Constructs a parameter set for RC5 from the given version, number of rounds, word size (in bits), and IV. |
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| Method Summary | |
|---|---|
boolean |
equals(Object obj)
Tests for equality between the specified object and this object. |
byte[] |
getIV()
Returns the IV or null if this parameter set does not contain an IV. |
int |
getRounds()
Returns the number of rounds. |
int |
getVersion()
Returns the version. |
int |
getWordSize()
Returns the word size in bits. |
int |
hashCode()
Calculates a hash code value for the object. |
| Methods inherited from class java.lang.Object |
|---|
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
RC5ParameterSpec
public RC5ParameterSpec(int version,
int rounds,
int wordSize)
- Constructs a parameter set for RC5 from the given version, number of
rounds and word size (in bits).
- Parameters:
version- the version.rounds- the number of rounds.wordSize- the word size in bits.
RC5ParameterSpec
public RC5ParameterSpec(int version,
int rounds,
int wordSize,
byte[] iv)
- Constructs a parameter set for RC5 from the given version, number of
rounds, word size (in bits), and IV.
Note that the size of the IV (block size) must be twice the word size. The bytes that constitute the IV are those between
iv[0]andiv[2*(wordSize/8)-1]inclusive.- Parameters:
version- the version.rounds- the number of rounds.wordSize- the word size in bits.iv- the buffer with the IV. The first2*(wordSize/8)bytes of the buffer are copied to protect against subsequent modification.- Throws:
IllegalArgumentException- ifivisnullor(iv.length < 2 * (wordSize / 8))
RC5ParameterSpec
public RC5ParameterSpec(int version,
int rounds,
int wordSize,
byte[] iv,
int offset)
- Constructs a parameter set for RC5 from the given version, number of
rounds, word size (in bits), and IV.
The IV is taken from
iv, starting atoffsetinclusive. Note that the size of the IV (block size), starting atoffsetinclusive, must be twice the word size. The bytes that constitute the IV are those betweeniv[offset]andiv[offset+2*(wordSize/8)-1]inclusive.- Parameters:
version- the version.rounds- the number of rounds.wordSize- the word size in bits.iv- the buffer with the IV. The first2*(wordSize/8)bytes of the buffer beginning atoffsetinclusive are copied to protect against subsequent modification.offset- the offset inivwhere the IV starts.- Throws:
IllegalArgumentException- ifivisnullor(iv.length - offset < 2 * (wordSize / 8))
| Method Detail |
|---|
getVersion
public int getVersion()
- Returns the version.
- Returns:
- the version.
getRounds
public int getRounds()
- Returns the number of rounds.
- Returns:
- the number of rounds.
getWordSize
public int getWordSize()
- Returns the word size in bits.
- Returns:
- the word size in bits.
getIV
public byte[] getIV()
- Returns the IV or null if this parameter set does not contain an IV.
- Returns:
- the IV or null if this parameter set does not contain an IV. Returns a new array each time this method is called.
equals
public boolean equals(Object obj)
- Tests for equality between the specified object and this
object. Two RC5ParameterSpec objects are considered equal if their
version numbers, number of rounds, word sizes, and IVs are equal.
(Two IV references are considered equal if both are null.)
- Parameters:
obj- the object to test for equality with this object.- Returns:
- true if the objects are considered equal, false if
objis null or otherwise. - See Also:
Object.hashCode(),Hashtable
hashCode
public int hashCode()
- Calculates a hash code value for the object.
Objects that are equal will also have the same hashcode.
- Returns:
- a hash code value for this object.
- See Also:
Object.equals(java.lang.Object),Hashtable
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Java™ Platform Standard Ed. 6 |
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Submit a bug or feature
For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright 2006 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.