Incorrect solutions (and odd number of bits in output) using trig circuits (sin & cos)

[GPhilli]

Hi All,

We have encountered the following two issues using the trigonometric circuits in the ABY circuit bin:

1. The outputs of the fp_ieee and standard 32 bit circuits output 40 and 33 bits of output respectively for both the sin and cos functions. We are not sure why they do so, and are not sure which of these bits are informative to the results.
2. Perhaps related to the first problem, we cannot achieve correct results using these circuits -- even when taking off corresponding first or last digits that presumably may represent diagnostic information.

We attach the following output demonstrating these errors in the standard 32 after running a test diagnostic:

Thank you for your time, and double thank you for developing such an awesome tool!

• Greg P