tomsfastmath: further size optimizations

sources list created via

    make clean ; make CC=gcc LDFLAGS="-Wl,--gc-sections" CFLAGS="-O -ffunction-sections"
    readelf -a pixiewps | grep '\.c' | awk '{print "./" $8 " \\"}' > tfm_used.txt

and some manual cleanups.

src/crypto/tfm/sources.mak

@@ -20,7 +20,6 @@ TFM_SRCS = \
 ./fp_mul_2.c \
 ./fp_mul_2d.c \
 ./fp_mul_comba.c \
-./fp_mul_comba_small_set.c \
 ./fp_mul_d.c \
 ./fp_mulmod.c \
 ./fp_read_unsigned_bin.c \
@@ -29,7 +28,6 @@ TFM_SRCS = \
 ./fp_set.c \
 ./fp_sqr.c \
 ./fp_sqr_comba_generic.c \
-./fp_sqr_comba_small_set.c \
 ./fp_sub.c \
 ./fp_to_unsigned_bin.c \
 ./fp_unsigned_bin_size.c \

src/crypto/tfm/tfm.h

@@ -44,7 +44,7 @@
    Enable these if you are going to be doing a lot of small (<= 16 digit) multiplications say in ECC
    Or if you're on a 64-bit machine doing RSA as a 1024-bit integer == 16 digits ;-)
  */
-#define TFM_SMALL_SET
+/* #define TFM_SMALL_SET */
 
 /* do we want huge code
    Enable these if you are doing 20, 24, 28, 32, 48, 64 digit multiplications (useful for RSA)