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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.
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,
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. |
|
| Method Summary | |
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. |
| Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
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
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 Reference Guide
for information about standard algorithm names.| Method Detail |
public String getAlgorithm()
getAlgorithm in interface Keypublic String getFormat()
getFormat in interface Keypublic byte[] getEncoded()
getEncoded in interface Key
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