Add symbols files

Export only used symbols and keep implemetations details hidden.
Stripped away symbols are:

fp_mul_comba20, fp_mul_comba24, fp_mul_comba28, fp_mul_comba32, fp_mul_comba48,
fp_mul_comba64, fp_mul_comba, fp_mul_comba_small, fp_prime_miller_rabin,
fp_sqr_comba20, fp_sqr_comba24, fp_sqr_comba28, fp_sqr_comba32, fp_sqr_comba48,
fp_sqr_comba64, fp_sqr_comba, fp_sqr_comba_small, s_fp_add, s_fp_sub,
fp_reverse, fp_s_rmap

Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>

libtfm.symbols

@@ -0,0 +1,49 @@
+fp_2expt
+fp_add
+fp_add_d
+fp_addmod
+fp_cmp
+fp_cmp_d
+fp_cmp_mag
+fp_cnt_lsb
+fp_count_bits
+fp_div
+fp_div_2
+fp_div_2d
+fp_div_d
+fp_exptmod
+fp_gcd
+fp_ident
+fp_invmod
+fp_isprime
+fp_lcm
+fp_lshd
+fp_mod
+fp_mod_2d
+fp_mod_d
+fp_montgomery_calc_normalization
+fp_montgomery_reduce
+fp_montgomery_setup
+fp_mul
+fp_mul_2
+fp_mul_2d
+fp_mul_d
+fp_mulmod
+fp_prime_random_ex
+fp_radix_size
+fp_read_radix
+fp_read_signed_bin
+fp_read_unsigned_bin
+fp_rshd
+fp_set
+fp_signed_bin_size
+fp_sqr
+fp_sqrmod
+fp_sub
+fp_sub_d
+fp_submod
+fp_to_signed_bin
+fp_to_unsigned_bin
+fp_toradix
+fp_toradix_n
+fp_unsigned_bin_size

makefile.shared

@@ -88,7 +88,7 @@ $(OBJECTS): $(HEADERS)
 	$(LTCOMPILE) $(CFLAGS) $(LDFLAGS) -o $@ -c $<
 
 $(LIBNAME): $(OBJECTS)
-	libtool --silent --mode=link --tag=CC $(CC) $(CFLAGS) $(LDFLAGS) `find . -type f | grep "[.]lo" | xargs` -o $(LIBNAME) -rpath $(LIBPATH) -version-info $(VERSION)
+	libtool --silent --mode=link --tag=CC $(CC) $(CFLAGS) $(LDFLAGS) `find . -type f | grep "[.]lo" | xargs` -o $(LIBNAME) -rpath $(LIBPATH) -version-info $(VERSION) -export-symbols libtfm.symbols
 
 install: $(LIBNAME)
 	install -d -g $(GROUP) -o $(USER) $(DESTDIR)$(LIBPATH)