somehow #define LTC_SOURCE 1 (which should really be in all libtomcrypt

.c files to be the same as how its native Makefile does it) makes the
ltc_ecc_mulmod_timing et al work

dropbear/libtomcrypt/src/headers/tomcrypt_custom.h

@@ -139,7 +139,7 @@
 #ifdef DROPBEAR_ECC
 #define MECC
 #define LTC_ECC_SHAMIR
-// #define LTC_ECC_TIMING_RESISTANT
+#define LTC_ECC_TIMING_RESISTANT
 #define MPI
 #define LTM_DESC
 #ifdef DROPBEAR_ECC_256

dropbear/libtomcrypt/src/pk/ecc/ltc_ecc_mul2add.c

@@ -14,6 +14,7 @@
  * All curves taken from NIST recommendation paper of July 1999
  * Available at http://csrc.nist.gov/cryptval/dss.htm
  */
+#define LTC_SOURCE 1
 #include "tomcrypt.h"
 
 /**

dropbear/libtomcrypt/src/pk/ecc/ltc_ecc_mulmod_timing.c

@@ -14,6 +14,7 @@
  * All curves taken from NIST recommendation paper of July 1999
  * Available at http://csrc.nist.gov/cryptval/dss.htm
  */
+#define LTC_SOURCE 1
 #include "tomcrypt.h"
 
 /**

dropbear/libtomcrypt/src/pk/ecc/ltc_ecc_projective_add_point.c

@@ -14,6 +14,7 @@
  * All curves taken from NIST recommendation paper of July 1999
  * Available at http://csrc.nist.gov/cryptval/dss.htm
  */
+#define LTC_SOURCE 1
 #include "tomcrypt.h"
 
 /**

dropbear/libtomcrypt/src/pk/ecc/ltc_ecc_projective_dbl_point.c

@@ -14,6 +14,7 @@
  * All curves taken from NIST recommendation paper of July 1999
  * Available at http://csrc.nist.gov/cryptval/dss.htm
  */
+#define LTC_SOURCE 1
 #include "tomcrypt.h"
 
 /**