HashBlock Method

Computes the hash value of specified data.

Syntax

hash.hashBlock(inputBuffer_Buffer, lastBlock, [callback])

Callback

The 'callback' parameter specifies a function which will be called when the operation completes (or an error is encountered). If the 'callback' parameter is not specified, then the method will block and will not return until the operation completes (or an error is encountered).

The callback for this method is defined as:

function(err, buffer){ }

'err' is the error that occurred. If there was no error, then 'err' is 'null'.

'buffer' is the value returned by the method.

'err' has 2 properties which hold detailed information:

err.code
err.message

Remarks

This method will computes the hash value of the input data. This method will return the hash value only when the parameter LastBlock is True.

InputBuffer specifies the input data.

LastBlock specifies whether the block is the last block. If this is False the method will return an empty byte array.

To calculate the hash value of data that is broken apart into multiple blocks make multiple calls to this method. For instance:

Hash.HashBlock(part1,false);
Hash.HashBlock(part2,false);
Hash.HashBlock(part3,false);
byte[] hashValue = Hash.HashBlock(lastPart,true);