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cryptix.jce.provider.md
Class PaddingMD
java.lang.Objectjava.security.MessageDigestSpi
- abstract class PaddingMD
- extends java.security.MessageDigestSpi
This abstract class implements the MD4-like block/padding structure as it is used by most hashes (MD4, MD5, SHA-0, SHA-1, RIPEMD-128, RIPEMD-160, Tiger). This class handles the message buffering, bit counting and padding. Subclasses need implement only the three abstract functions to create a working hash. This class has three padding modes: MD5-like, SHA-like and Tiger-like. This applies to the padding and encoding of the 64-bit length counter.
- Version:
- $Revision: 1.8 $
| Field Summary | |
private int |
blockSize
Size (in bytes) of the blocks. |
private byte[] |
buf
64 byte buffer |
private int |
bufOff
Buffer offset |
private long |
byteCount
Number of bytes hashed 'till now. |
private static int |
DEFAULT_BLOCKSIZE
|
private int |
hashSize
Size (in bytes) of the digest |
private int |
mode
Mode |
(package private) static int |
MODE_MD
|
(package private) static int |
MODE_SHA
|
(package private) static int |
MODE_TIGER
|
| Constructor Summary | |
protected |
PaddingMD(int hashSize,
int mode)
Construct a 64-byte PaddingMD in MD-like, SHA-like or Tiger-like padding mode. |
protected |
PaddingMD(int blockSize,
int hashSize,
int mode)
Construct a 64 or 128-byte PaddingMD in MD-like, SHA-like or Tiger-like padding mode. |
protected |
PaddingMD(PaddingMD src)
|
| Method Summary | |
java.lang.Object |
clone()
Returns a clone of this class. |
protected abstract void |
coreDigest(byte[] buf,
int off)
Return the hash bytes in buf, starting at offset
off. |
protected abstract void |
coreReset()
Reset the hash internal structures to initial state. |
protected abstract void |
coreUpdate(byte[] buf,
int off)
Update the internal state with a single block. |
protected byte[] |
engineDigest()
Computes the final digest of the stored bytes and returns them. |
protected int |
engineDigest(byte[] buf,
int offset,
int len)
Computes the final digest of the stored bytes and returns them. |
protected int |
engineGetDigestLength()
Returns the length of the digest. |
protected void |
engineReset()
Resets the digest engine. |
protected void |
engineUpdate(byte input)
Updates the digest with the specified byte. |
protected void |
engineUpdate(byte[] input,
int offset,
int length)
Updates the digest with the specified bytes starting with the offset and proceeding for the specified length. |
private int |
privateDigest(byte[] buf,
int offset,
int len)
Same as protected int engineDigest(byte[] buf, int offset, int len) except that we don't validate arguments. |
| Methods inherited from class java.lang.Object |
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
DEFAULT_BLOCKSIZE
private static final int DEFAULT_BLOCKSIZE
- See Also:
- Constant Field Values
blockSize
private final int blockSize
- Size (in bytes) of the blocks.
hashSize
private final int hashSize
- Size (in bytes) of the digest
buf
private final byte[] buf
- 64 byte buffer
bufOff
private int bufOff
- Buffer offset
byteCount
private long byteCount
- Number of bytes hashed 'till now.
mode
private final int mode
- Mode
MODE_MD
static final int MODE_MD
- See Also:
- Constant Field Values
MODE_SHA
static final int MODE_SHA
- See Also:
- Constant Field Values
MODE_TIGER
static final int MODE_TIGER
- See Also:
- Constant Field Values
| Constructor Detail |
PaddingMD
protected PaddingMD(int hashSize,
int mode)
- Construct a 64-byte PaddingMD in MD-like, SHA-like or Tiger-like
padding mode.
The subclass must call this constructor, giving the length of it's hash
in bytes.
PaddingMD
protected PaddingMD(int blockSize,
int hashSize,
int mode)
- Construct a 64 or 128-byte PaddingMD in MD-like, SHA-like or Tiger-like
padding mode.
PaddingMD
protected PaddingMD(PaddingMD src)
| Method Detail |
clone
public java.lang.Object clone() throws java.lang.CloneNotSupportedException
- Description copied from class:
java.security.MessageDigestSpi - Returns a clone of this class.
If cloning is not supported, then by default the class throws a
CloneNotSupportedException. The MessageDigestSpi provider
implementation has to overload this class in order to be
cloneable.
engineGetDigestLength
protected int engineGetDigestLength()
- Description copied from class:
java.security.MessageDigestSpi - Returns the length of the digest. It may be overridden by the
provider to return the length of the digest. Default is to
return 0. It is concrete for backwards compatibility with JDK1.1
message digest classes.
engineUpdate
protected void engineUpdate(byte input)
- Description copied from class:
java.security.MessageDigestSpi - Updates the digest with the specified byte.
engineUpdate
protected void engineUpdate(byte[] input,
int offset,
int length)
- Description copied from class:
java.security.MessageDigestSpi - Updates the digest with the specified bytes starting with the
offset and proceeding for the specified length.
engineDigest
protected byte[] engineDigest()
- Description copied from class:
java.security.MessageDigestSpi - Computes the final digest of the stored bytes and returns
them. It performs any necessary padding. The message digest
should reset sensitive data after performing the digest.
engineDigest
protected int engineDigest(byte[] buf,
int offset,
int len)
throws java.security.DigestException
- Description copied from class:
java.security.MessageDigestSpi - Computes the final digest of the stored bytes and returns
them. It performs any necessary padding. The message digest
should reset sensitive data after performing the digest. This
method is left concrete for backwards compatibility with JDK1.1
message digest classes.
privateDigest
private int privateDigest(byte[] buf,
int offset,
int len)
- Same as protected int engineDigest(byte[] buf, int offset, int len)
except that we don't validate arguments.
engineReset
protected void engineReset()
- Description copied from class:
java.security.MessageDigestSpi - Resets the digest engine. Reinitializes internal variables
and clears sensitive data.
coreDigest
protected abstract void coreDigest(byte[] buf,
int off)
- Return the hash bytes in
buf, starting at offsetoff. The subclass is expected to write exactlyhashSizebytes in the given buffer. The buffer is guaranteed to be large enough.
coreReset
protected abstract void coreReset()
- Reset the hash internal structures to initial state.
coreUpdate
protected abstract void coreUpdate(byte[] buf,
int off)
- Update the internal state with a single block.
bufcontains a single block (64 bytes, 512 bits) of data, starting at offsetoff.
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