tree 97b3603f142834aad17f26f81e69f5a4c456ed43
parent c7fb230fa4e5a521bf5c047f1ae2a9345284f6bf
author Janos Follath <janos.follath@arm.com> 1485533120 +0000
committer Simon Butcher <simon.butcher@arm.com> 1488308195 +0000

ECP: Prevent freeing a buffer on stack

The function ecp_mod_koblitz computed the space for the result of a
multiplication optimally for that specific case, but unfortunately
the function mbedtls_mpi_mul_mpi performs a generic, suboptimal
calculation and needs one more limb for the result. Since the result's
buffer is on the stack, the best case scenario is that the program
stops.

This only happened on 64 bit platforms.

Fixes #569