Expand the mpi library based on libgcrypt, and the ECC algorithm of
mpi based on libgcrypt requires these functions.
Some other algorithms will be developed based on mpi ecc, such as SM2.
Signed-off-by: NTianjia Zhang <tianjia.zhang@linux.alibaba.com>
Tested-by: NXufeng Zhang <yunbo.xufeng@linux.alibaba.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>