In ecl_gf_c in the ECC code, there is an error in functions ec_GFp_sub_5 and ec_GFp_sub_6. In the if (borrow) block, there should be (5,6) MP_ADD_CARRY operations for ec_GFp_sub_(5,6) (including the first MP_ADD_CARRY_ZERO). Each of these functions is missing one add/carry operation.

These functions are optimizations that are currently unused. This error will need to be fixed before these functions can be used by new curves (e.g. Brainpool).