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java.lang.Object | +--javax.crypto.spec.SecretKeySpec
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 | |
SecretKeySpec(byte[] key,
java.lang.String algorithm)
Constructs a secret key from the given byte array. |
|
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 .
|
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, equals, finalize, getClass, hashCode, notifyAll, notify, 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)
must be used.
key
- the key material of the secret key.
algorithm
- the name of the associated algorithm.public SecretKeySpec(byte[] key, int offset, int len, java.lang.String algorithm)
len
bytes of key
, starting at
offset
.
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 standard name of the associated key algorithm.
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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