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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.
Constructor Summary | |
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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.
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SecretKeySpec(byte[] key, String algorithm) Constructs a secret key from the given byte array. |
Method Summary | |
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boolean |
Tests for equality between the specified object and this object. |
String |
Returns the name of the algorithm associated with this secret key. |
byte[] |
Returns the key material of this secret key. |
String |
Returns the name of the encoding format for this secret key. |
int |
hashCode() Calculates a hash code value for the object. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public SecretKeySpec(byte[] key, int offset, int len, String algorithm)
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:
{@link DESKeySpec DESKeySpec})
must be used.
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 Extension Reference Guide
for information about standard algorithm names.public SecretKeySpec(byte[] key, String algorithm)
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:
{@link DESKeySpec DESKeySpec})
should be used.
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 Extension Reference Guide
for information about standard algorithm names.Method Detail |
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public boolean equals(Object obj)
equals
in class Object
obj
- the object to test for equality with this object.obj
is null or otherwise.public String getAlgorithm()
public byte[] getEncoded()
public String getFormat()
public int hashCode()
hashCode
in class Object
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