Class javax.crypto.spec.SecretKeySpec
java.lang.Object
|
+----javax.crypto.spec.SecretKeySpec
- public class SecretKeySpec
- extends java.lang.Object
- implements 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
.
- See Also:
- SecretKey, SecretKeyFactory
Constructor Summary
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SecretKeySpec(byte[] key,
java.lang.String algorithm)
Constructs a secret key from the given byte array.
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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 .
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Method Summary
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java.lang.String
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getAlgorithm()
Returns the name of the algorithm associated with this secret key.
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byte[]
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getEncoded()
Returns the key material of this secret key.
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java.lang.String
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getFormat()
Returns the name of the encoding format for this secret key.
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Methods inherited from class java.lang.Object
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
SecretKeySpec
public SecretKeySpec(byte[] key,
java.lang.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)
must be used.
- Parameters:
key
- the key material of the secret key.
algorithm
- the name of the associated algorithm.
SecretKeySpec
public 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
.
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.
- Parameters:
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.
getAlgorithm
public java.lang.String getAlgorithm()
- Returns the name of the algorithm associated with this secret key.
- Returns:
- the secret key algorithm.
getFormat
public java.lang.String getFormat()
- Returns the name of the encoding format for this secret key.
- Returns:
- the string "RAW".
getEncoded
public byte[] getEncoded()
- Returns the key material of this secret key.
- Returns:
- the key material