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Préférences
Moteurs de recherche
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JavaTM 2 Platform Std. Ed. v1.6.0
java.security
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Constructor Summary | |
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MessageDigestSpi()
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Method Summary | |
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Object |
clone()
Returns a clone if the implementation is cloneable. |
protected abstract byte[] |
engineDigest()
Completes the hash computation by performing final operations such as padding. |
protected int |
engineDigest(byte[] buf,
int offset,
int len)
Completes the hash computation by performing final operations such as padding. |
protected int |
engineGetDigestLength()
Returns the digest length in bytes. |
protected abstract void |
engineReset()
Resets the digest for further use. |
protected abstract void |
engineUpdate(byte input)
Updates the digest using the specified byte. |
protected abstract void |
engineUpdate(byte[] input,
int offset,
int len)
Updates the digest using the specified array of bytes, starting at the specified offset. |
protected void |
engineUpdate(ByteBuffer input)
Update the digest using the specified ByteBuffer. |
Methods inherited from class java.lang.Object |
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equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public MessageDigestSpi()
Method Detail |
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protected int engineGetDigestLength()
This concrete method has been added to this previously-defined abstract class. (For backwards compatibility, it cannot be abstract.)
The default behavior is to return 0.
This method may be overridden by a provider to return the digest length.
protected abstract void engineUpdate(byte input)
input
- the byte to use for the update.protected abstract void engineUpdate(byte[] input, int offset, int len)
input
- the array of bytes to use for the update.offset
- the offset to start from in the array of bytes.len
- the number of bytes to use, starting at
offset
.protected void engineUpdate(ByteBuffer input)
input.remaining()
bytes starting
at input.position()
.
Upon return, the buffer's position will be equal to its limit;
its limit will not have changed.
input
- the ByteBufferprotected abstract byte[] engineDigest()
engineDigest
has
been called, the engine should be reset (see
engineReset
).
Resetting is the responsibility of the
engine implementor.
protected int engineDigest(byte[] buf, int offset, int len) throws DigestException
engineDigest
has
been called, the engine should be reset (see
engineReset
).
Resetting is the responsibility of the
engine implementor.
This method should be abstract, but we leave it concrete for
binary compatibility. Knowledgeable providers should override this
method.
buf
- the output buffer in which to store the digestoffset
- offset to start from in the output bufferlen
- number of bytes within buf allotted for the digest.
Both this default implementation and the SUN provider do not
return partial digests. The presence of this parameter is solely
for consistency in our API's. If the value of this parameter is less
than the actual digest length, the method will throw a DigestException.
This parameter is ignored if its value is greater than or equal to
the actual digest length.
DigestException
- if an error occurs.protected abstract void engineReset()
public Object clone() throws CloneNotSupportedException
CloneNotSupportedException
- if this is called on an
implementation that does not support Cloneable
.Cloneable