程序包 javax.crypto.spec

类 SecretKeySpec

java.lang.Object

javax.crypto.spec.SecretKeySpec

所有已实现的接口:

Serializable, Key, KeySpec, SecretKey, Destroyable

public class SecretKeySpec
extends Object
implements KeySpec, SecretKey

This class specifies a secret key in a provider-independent fashion.

It can be used to construct a SecretKey from a byte array, without having to go through a (provider-based) SecretKeyFactory.

This class is only useful for raw secret keys that can be represented as a byte array and have no key parameters associated with them, e.g., DES or Triple DES keys.

从以下版本开始:

1.4

另请参阅:

SecretKey, SecretKeyFactory, 序列化表格

字段概要

从接口继承的字段 javax.crypto.SecretKey

serialVersionUID

构造器概要

构造器

构造器	说明
SecretKeySpec(byte[] key, int offset, int len, String algorithm)	Constructs a secret key from the given byte array, using the first len bytes of key, starting at offset inclusive.
SecretKeySpec(byte[] key, String algorithm)	Constructs a secret key from the given byte array.

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.
String	getAlgorithm()	Returns the name of the algorithm associated with this secret key.
byte[]	getEncoded()	Returns the key material of this secret key.
String	getFormat()	Returns the name of the encoding format for this secret key.
int	hashCode()	Calculates a hash code value for the object.

从接口继承的方法 javax.security.auth.Destroyable

destroy, isDestroyed

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

SecretKeySpec

public SecretKeySpec(byte[] key,
                     String algorithm)

Constructs a secret key from the given byte array.

This constructor does not check if the given bytes indeed specify a secret key of the specified algorithm. For example, if the algorithm is DES, this constructor does not check if key is 8 bytes long, and also does not check for weak or semi-weak keys. In order for those checks to be performed, an algorithm-specific key specification class (in this case: DESKeySpec) should be used.

参数:

key - the key material of the secret key. The contents of the array are copied to protect against subsequent modification.

algorithm - the name of the secret-key algorithm to be associated with the given key material. See Appendix A in the Java Cryptography Architecture Reference Guide for information about standard algorithm names.

抛出:

IllegalArgumentException - if algorithm is null or key is null or empty.

SecretKeySpec

public SecretKeySpec(byte[] key,
                     int offset,
                     int len,
                     String algorithm)

Constructs a secret key from the given byte array, using the first len bytes of key, starting at offset inclusive.

The bytes that constitute the secret key are those between key[offset] and key[offset+len-1] inclusive.

This constructor does not check if the given bytes indeed specify a secret key of the specified algorithm. For example, if the algorithm is DES, this constructor does not check if key is 8 bytes long, and also does not check for weak or semi-weak keys. In order for those checks to be performed, an algorithm-specific key specification class (in this case: DESKeySpec) must be used.

参数:

key - the key material of the secret key. The first len bytes of the array beginning at offset inclusive are copied to protect against subsequent modification.

offset - the offset in key where the key material starts.

len - the length of the key material.

algorithm - the name of the secret-key algorithm to be associated with the given key material. See Appendix A in the Java Cryptography Architecture Reference Guide for information about standard algorithm names.

抛出:

IllegalArgumentException - if algorithm is null or key is null, empty, or too short, i.e. key.length-offset<len.

ArrayIndexOutOfBoundsException - is thrown if offset or len index bytes outside the key.

方法详细资料

getAlgorithm

public String getAlgorithm()

Returns the name of the algorithm associated with this secret key.

指定者:

getAlgorithm 在接口中 Key

返回:

the secret key algorithm.

getFormat

public String getFormat()

Returns the name of the encoding format for this secret key.

指定者:

getFormat 在接口中 Key

返回:

the string "RAW".

getEncoded

public byte[] getEncoded()

Returns the key material of this secret key.

指定者:

getEncoded 在接口中 Key

返回:

the key material. Returns a new array each time this method is called.

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)

equals

public boolean equals(Object obj)

Tests for equality between the specified object and this object. Two SecretKeySpec objects are considered equal if they are both SecretKey instances which have the same case-insensitive algorithm name and key encoding.

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