Maven module :un.api : api-encoding :
Class : un.impl.cryptography.hash.HashFunction
Extends/Implements : -
Subclasses : -

HashFunction are different from checksum in the way they offer low collisions.
TODO : merge with checksum ?
Definition :
http://en.wikipedia.org/wiki/Cryptographic_hash_function
author  Johann Sorel

Variables : -
Functions : getName, isCryptographic, getResultLength, reset, update, update, update, getResultBytes, getResultLong


Hash function name.
return  Chars, never null
Chars getName ()


Indicate if this hash function was created to match cryptographic requests.
example :
CRC-32, Adler-32 return false
SHA-1, MD5 return true;
return  true is used for cryptographic purpose, false otherwise
boolean isCryptographic ()


Expected result length in bits.
return  length in bits
int getResultLength ()


Reinitialize hash function.
void reset ()


Update hash with given byte.
param  b
void update (int b)


Update hash with given bytes.
param  buffer
void update (byte[] buffer)


Update hash with given bytes.
param  buffer byte array
param  offset start offset in array
param  length number of element to use
void update (byte[] buffer, int offset, int length)


Result as byte array.
Length is given by getResultLength()/8.
return  byte array never null;
byte[] getResultBytes ()


Result as number value.
This value can be truncated, use getResultBytes is length exceed 64bits.
return  long value
long getResultLong ()