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java.lang.Object | +--javax.crypto.spec.SecretKeySpec
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.
SecretKey
,
SecretKeyFactory
, Serialized FormConstructor Summary | |
SecretKeySpec(byte[] key,
int offset,
int len,
java.lang.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,
java.lang.String algorithm)
Constructs a secret key from the given byte array. |
Method Summary | |
boolean |
equals(java.lang.Object obj)
|
java.lang.String |
getAlgorithm()
Returns the name of the algorithm associated with this secret key. |
byte[] |
getEncoded()
Returns the key material of this secret key. |
java.lang.String |
getFormat()
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 |
clone,
finalize,
getClass,
notify,
notifyAll,
toString,
wait,
wait,
wait |
Constructor Detail |
public SecretKeySpec(byte[] key, java.lang.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:
DESKeySpec
)
should be used.
key
- the key material of the secret key.algorithm
- the name of the secret-key algorithm to be associated
with the given key material.
See Appendix A in the
Java Cryptography Extension API Specification & Reference
for information about standard algorithm names.public SecretKeySpec(byte[] key, int offset, int len, java.lang.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:
DESKeySpec
)
must be used.
key
- the key material of the secret key.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 API Specification & Reference
for information about standard algorithm names.Method Detail |
public java.lang.String getAlgorithm()
public java.lang.String getFormat()
public byte[] getEncoded()
public int hashCode()
public boolean equals(java.lang.Object obj)
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