Add mbedtls_ecp_set_max_ops()
The plan is to count basic operations as follows:
- call to ecp_add_mixed() -> 11
- call to ecp_double_jac() -> 8
- call to mpi_mul_mpi() -> 1
- call to mpi_inv_mod() -> 120
- everything else -> not counted
The counts for ecp_add_mixed() and ecp_double_jac() are based on the actual
number of calls to mpi_mul_mpi() they they make.
The count for mpi_inv_mod() is based on timing measurements on K64F and
LPC1768 boards, and are consistent with the usual very rough estimate of one
inversion = 100 multiplications. It could be useful to repeat that measurement
on a Cortex-M0 board as those have smaller divider and multipliers, so the
result could be a bit different but should be the same order of magnitude.
The documented limitation of 120 basic ops is due to the calls to mpi_inv_mod()
which are currently not interruptible nor planned to be so far.
diff --git a/library/ecp.c b/library/ecp.c
index c7f4b04..1358a3f 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -85,6 +85,22 @@
static unsigned long add_count, dbl_count, mul_count;
#endif
+
+#if defined(MBEDTLS_ECP_EARLY_RETURN)
+/*
+ * Maximum number of "basic operations" to be done in a row.
+ */
+static unsigned ecp_max_ops = 0;
+
+/*
+ * Set ecp_max_ops
+ */
+void mbedtls_ecp_set_max_ops( unsigned max_ops )
+{
+ ecp_max_ops = max_ops;
+}
+#endif /* MBEDTLS_ECP_EARLY_RETURN */
+
#if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED) || \
defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED) || \
defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) || \