程序包 javax.crypto.spec

类 RC5ParameterSpec

java.lang.Object

javax.crypto.spec.RC5ParameterSpec

所有已实现的接口:

AlgorithmParameterSpec

public class RC5ParameterSpec
extends Object
implements AlgorithmParameterSpec

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.

从以下版本开始:

1.4

构造器概要

构造器

构造器	说明
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).
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.
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.

方法概要

限定符和类型	方法	说明
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.

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

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).

参数:

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] and iv[2*(wordSize/8)-1] inclusive.

参数:

version - the version.

rounds - the number of rounds.

wordSize - the word size in bits.

iv - the buffer with the IV. The first 2*(wordSize/8) bytes of the buffer are copied to protect against subsequent modification.

抛出:

IllegalArgumentException - if iv is null or (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 at offset inclusive. Note that the size of the IV (block size), starting at offset inclusive, must be twice the word size. The bytes that constitute the IV are those between iv[offset] and iv[offset+2*(wordSize/8)-1] inclusive.

参数:

version - the version.

rounds - the number of rounds.

wordSize - the word size in bits.

iv - the buffer with the IV. The first 2*(wordSize/8) bytes of the buffer beginning at offset inclusive are copied to protect against subsequent modification.

offset - the offset in iv where the IV starts.

抛出:

IllegalArgumentException - if iv is null or (iv.length - offset < 2 * (wordSize / 8))

方法详细资料

getVersion

public int getVersion()

Returns the version.

返回:

the version.

getRounds

public int getRounds()

Returns the number of rounds.

返回:

the number of rounds.

getWordSize

public int getWordSize()

Returns the word size in bits.

返回:

the word size in bits.

getIV

public byte[] getIV()

Returns the IV or null if this parameter set does not contain an IV.

返回:

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.)

覆盖:

equals 在类中 Object

参数:

obj - the object to test for equality with this object.

返回:

true if the objects are considered equal, false if obj is null or otherwise.

另请参阅:

Object.hashCode(), HashMap

hashCode

public int hashCode()

Calculates a hash code value for the object. Objects that are equal will also have the same hashcode.

覆盖:

hashCode 在类中 Object

返回:

a hash code value for this object.

另请参阅:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)