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2018-06-25Add inter-module private header for EC functionsNicola Tuveri
Internal submodules of libcrypto may require non-public functions from the EC submodule. In preparation to use `ec_group_do_inverse_ord()` (from #6116) inside the SM2 submodule to apply a SCA mitigation on the modular inversion, this commit moves the `ec_group_do_inverse_ord()` prototype declaration from the EC-local `crypto/ec/ec_lcl.h` header to the `crypto/include/internal/ec_int.h` inter-module private header. Reviewed-by: Andy Polyakov <appro@openssl.org> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/6521)