Buffer overflow in sponge queue functions

Impact
The Keccak sponge function interface accepts partial inputs to be
absorbed and partial outputs to be squeezed. A buffer can overflow
when partial data with some specific sizes are queued, where at
least one of them has a length of 2^32 - 200 bytes or more.
Patches
Yes, see commit fdc6fef0.
Workarounds
The problem can be avoided by limiting the size of the partial
input data (or partial output digest) below 2^32 - 200 bytes.
Multiple calls to the queue system can be chained at a higher
level to retain the original functionality. Alternatively, one
can process the entire input (or produce the entire output) at
once, avoiding the queuing functions altogether.
References
See issue #105 for more details.