# Multos Forums

### Documentation for ECC operations

In the MDRM I can find some documentation for the ECC operations supported by the MULTOS platform. However, the documentation is rather minimal. The operations are explained properly, but the data structure for the domain parameters is only given in an example. So I’m wondering whether there is some additional documentation available explaining this structure, for example, what are valid values for the ‘format’ byte and what does their value mean?

Thanks for your question.

At present, MULTOS only supports a domain parameters format byte of 0x00 corresponding to *Elliptic Curve Domain Parameters over Fp*. The data structure is shown on page 113 of MDRM v1.49

You can read more about domain parameters in this document from www.secg.org. Examples of domain parameters you can use are available here.

I hope that helps.