[FS#786] Please, add support to ecdsa key type

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Uqbar (Uqbar) 

Attached to Project - LEDE Project
Summary - Please, add support to ecdsa key type
Task Type - Feature Request
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - lede-17.01
Due in Version - Undecided
Due Date - Undecided
Details - At the moment dropbear tool is compiled without the ecdsa key type support.
ECDSA (https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm) is considere better than RSA as it requires fewer key bits to gain same security.


More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=786