程序包 javax.crypto.spec

类 RC2ParameterSpec

java.lang.Object

javax.crypto.spec.RC2ParameterSpec

所有已实现的接口:

AlgorithmParameterSpec

public class RC2ParameterSpec
extends Object
implements AlgorithmParameterSpec

This class specifies the parameters used with the RC2 algorithm.

The parameters consist of an effective key size and optionally an 8-byte initialization vector (IV) (only in feedback mode).

This class can be used to initialize a Cipher object that implements the RC2 algorithm.

从以下版本开始:

1.4

构造器概要

构造器

构造器	说明
RC2ParameterSpec(int effectiveKeyBits)	Constructs a parameter set for RC2 from the given effective key size (in bits).
RC2ParameterSpec(int effectiveKeyBits, byte[] iv)	Constructs a parameter set for RC2 from the given effective key size (in bits) and an 8-byte IV.
RC2ParameterSpec(int effectiveKeyBits, byte[] iv, int offset)	Constructs a parameter set for RC2 from the given effective key 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.
int	getEffectiveKeyBits()	Returns the effective key size in bits.
byte[]	getIV()	Returns the IV or null if this parameter set does not contain an IV.
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

RC2ParameterSpec

public RC2ParameterSpec(int effectiveKeyBits)

Constructs a parameter set for RC2 from the given effective key size (in bits).

参数:

effectiveKeyBits - the effective key size in bits.

RC2ParameterSpec

public RC2ParameterSpec(int effectiveKeyBits,
                        byte[] iv)

Constructs a parameter set for RC2 from the given effective key size (in bits) and an 8-byte IV.

The bytes that constitute the IV are those between iv[0] and iv[7] inclusive.

参数:

effectiveKeyBits - the effective key size in bits.

iv - the buffer with the 8-byte IV. The first 8 bytes of the buffer are copied to protect against subsequent modification.

抛出:

IllegalArgumentException - if iv is null.

RC2ParameterSpec

public RC2ParameterSpec(int effectiveKeyBits,
                        byte[] iv,
                        int offset)

Constructs a parameter set for RC2 from the given effective key size (in bits) and IV.

The IV is taken from iv, starting at offset inclusive. The bytes that constitute the IV are those between iv[offset] and iv[offset+7] inclusive.

参数:

effectiveKeyBits - the effective key size in bits.

iv - the buffer with the IV. The first 8 bytes of the buffer beginning at offset inclusive are copied to protect against subsequent modification.

offset - the offset in iv where the 8-byte IV starts.

抛出:

IllegalArgumentException - if iv is null.

方法详细资料

getEffectiveKeyBits

public int getEffectiveKeyBits()

Returns the effective key size in bits.

返回:

the effective key 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 RC2ParameterSpec objects are considered equal if their effective key 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)