| java.lang.Object
 java.security.MessageDigestSpi
sun.security.provider.SHA2
| SHA2 | | public class SHA2 extends MessageDigestSpi implements Cloneable(Code) | | This class implements the Secure Hash Algorithm SHA-256 developed by
the National Institute of Standards and Technology along with the
National Security Agency.
It implements java.security.MessageDigestSpi, and can be used
through Java Cryptography Architecture (JCA), as a pluggable
MessageDigest implementation.
version:
1.6 10/10/06
author:
Valerie Peng |
| Constructor Summary | |
| public | SHA2()
Creates a new SHA object. |
| Method Summary | |
| public Object | clone()
| | protected byte[] | engineDigest()
Computes the final hash and returns the final value as a
byte[32] array. | | protected int | engineDigest(byte[] hashvalue, int offset, int len)
Computes the final hash and places the final value in the
specified array. | | protected int | engineGetDigestLength()
| | protected void | engineReset()
Resets the buffers and hash value to start a new hash. | | protected void | engineUpdate(byte b)
Update a byte. | | protected void | engineUpdate(byte b, int off, int len)
Update a buffer. |
| SHA2 | | public SHA2()(Code) | | Creates a new SHA object.
|
| engineDigest | | protected byte[] engineDigest()(Code) | | Computes the final hash and returns the final value as a
byte[32] array. The object is reset to be ready for further
use, as specified in the JavaSecurity MessageDigest
specification.
the digest |
| engineDigest | | protected int engineDigest(byte[] hashvalue, int offset, int len) throws DigestException(Code) | | Computes the final hash and places the final value in the
specified array. The object is reset to be ready for further
use, as specified in java.security.MessageDigest javadoc
specification.
Parameters:
hashvalue - buffer to hold the digest
Parameters:
offset - offset for storing the digest
Parameters:
len - length of the buffer length of the digest in bytes |
| engineGetDigestLength | | protected int engineGetDigestLength()(Code) | | the length of the digest in bytes |
| engineReset | | protected void engineReset()(Code) | | Resets the buffers and hash value to start a new hash.
|
| engineUpdate | | protected void engineUpdate(byte b)(Code) | | Update a byte.
Parameters:
b - the byte |
| engineUpdate | | protected void engineUpdate(byte b, int off, int len)(Code) | | Update a buffer.
Parameters:
b - the data to be updated.
Parameters:
off - the start offset in the data
Parameters:
len - the number of bytes to be updated. |
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