ecp_curves: Added `mbedtls_ecp_modulus_setup()`.
This patch introduces a new static method, responsible
for automatically initialising an modulus structure,
based on the curve id and a modulus type selector.
Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
diff --git a/include/mbedtls/ecp.h b/include/mbedtls/ecp.h
index 7a28a19..20b663e 100644
--- a/include/mbedtls/ecp.h
+++ b/include/mbedtls/ecp.h
@@ -141,6 +141,14 @@
MBEDTLS_ECP_TYPE_MONTGOMERY, /* y^2 = x^3 + a x^2 + x */
} mbedtls_ecp_curve_type;
+/*
+ * Curve moduli types
+ */
+typedef enum {
+ MBEDTLS_ECP_MOD_COORDINATE = 0,
+ MBEDTLS_ECP_MOD_SCALAR
+} mbedtls_ecp_modulus_type;
+
/**
* Curve information, for use by other modules.
*
diff --git a/library/ecp_curves.c b/library/ecp_curves.c
index 1a027d6..d4d8c08 100644
--- a/library/ecp_curves.c
+++ b/library/ecp_curves.c
@@ -5534,6 +5534,204 @@
}
#endif /* MBEDTLS_ECP_DP_SECP256K1_ENABLED */
-#endif /* !MBEDTLS_ECP_ALT */
+#if defined(MBEDTLS_TEST_HOOKS)
+/** Initialise a modulus with hard-coded const curve data.
+ *
+ * \param[out] N The address of the modulus structure to populate.
+ * Must be initialized.
+ * \param[in] id The mbedtls_ecp_group_id for which to initialise the modulus.
+ * \param[in] ctype The mbedtls_ecp_curve_type identifier for a coordinate modulus (P)
+ * or a scalar modulus (N).
+ *
+ * \return \c 0 if successful.
+ * \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if the given MPIs do not
+ * have the correct number of limbs.
+ *
+ * \note The caller is responsible for the \p N moduli lifecycle.
+ *
+ */
+MBEDTLS_STATIC_TESTABLE
+int mbedtls_ecp_modulus_setup(mbedtls_mpi_mod_modulus *N,
+ const mbedtls_ecp_group_id id,
+ const mbedtls_ecp_curve_type ctype)
+{
+ mbedtls_mpi_uint *p = NULL;
+ size_t p_limbs;
+
+ if (!(ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_COORDINATE || \
+ ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_SCALAR)) {
+ return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
+ }
+
+ switch (id) {
+#if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED)
+ case MBEDTLS_ECP_DP_SECP192R1:
+ if (ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_COORDINATE) {
+ p = (mbedtls_mpi_uint *) secp192r1_p;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp192r1_p));
+ } else {
+ p = (mbedtls_mpi_uint *) secp192r1_n;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp192r1_n));
+ }
+ break;
+#endif
+
+#if defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED)
+ case MBEDTLS_ECP_DP_SECP224R1:
+ if (ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_COORDINATE) {
+ p = (mbedtls_mpi_uint *) secp224r1_p;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp224r1_p));
+ } else {
+ p = (mbedtls_mpi_uint *) secp224r1_n;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp224r1_n));
+ }
+ break;
+#endif
+
+#if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
+ case MBEDTLS_ECP_DP_SECP256R1:
+ if (ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_COORDINATE) {
+ p = (mbedtls_mpi_uint *) secp256r1_p;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp256r1_p));
+ } else {
+ p = (mbedtls_mpi_uint *) secp256r1_n;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp256r1_n));
+ }
+ break;
+#endif
+
+#if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
+ case MBEDTLS_ECP_DP_SECP384R1:
+ if (ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_COORDINATE) {
+ p = (mbedtls_mpi_uint *) secp384r1_p;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp384r1_p));
+ } else {
+ p = (mbedtls_mpi_uint *) secp384r1_n;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp384r1_n));
+ }
+ break;
+#endif
+
+#if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED)
+ case MBEDTLS_ECP_DP_SECP521R1:
+ if (ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_COORDINATE) {
+ p = (mbedtls_mpi_uint *) secp521r1_p;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp521r1_p));
+ } else {
+ p = (mbedtls_mpi_uint *) secp521r1_n;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp521r1_n));
+ }
+ break;
+#endif
+
+#if defined(MBEDTLS_ECP_DP_BP256R1_ENABLED)
+ case MBEDTLS_ECP_DP_BP256R1:
+ if (ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_COORDINATE) {
+ p = (mbedtls_mpi_uint *) brainpoolP256r1_p;
+ p_limbs = CHARS_TO_LIMBS(sizeof(brainpoolP256r1_p));
+ } else {
+ p = (mbedtls_mpi_uint *) brainpoolP256r1_n;
+ p_limbs = CHARS_TO_LIMBS(sizeof(brainpoolP256r1_n));
+ }
+ break;
+#endif
+
+#if defined(MBEDTLS_ECP_DP_BP384R1_ENABLED)
+ case MBEDTLS_ECP_DP_BP384R1:
+ if (ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_COORDINATE) {
+ p = (mbedtls_mpi_uint *) brainpoolP384r1_p;
+ p_limbs = CHARS_TO_LIMBS(sizeof(brainpoolP384r1_p));
+ } else {
+ p = (mbedtls_mpi_uint *) brainpoolP384r1_n;
+ p_limbs = CHARS_TO_LIMBS(sizeof(brainpoolP384r1_n));
+ }
+ break;
+#endif
+
+#if defined(MBEDTLS_ECP_DP_BP512R1_ENABLED)
+ case MBEDTLS_ECP_DP_BP512R1:
+ if (ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_COORDINATE) {
+ p = (mbedtls_mpi_uint *) brainpoolP512r1_p;
+ p_limbs = CHARS_TO_LIMBS(sizeof(brainpoolP512r1_p));
+ } else {
+ p = (mbedtls_mpi_uint *) brainpoolP512r1_n;
+ p_limbs = CHARS_TO_LIMBS(sizeof(brainpoolP512r1_n));
+ }
+ break;
+#endif
+
+#if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED)
+ case MBEDTLS_ECP_DP_CURVE25519:
+ if (ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_COORDINATE) {
+ p = (mbedtls_mpi_uint *) curve25519_p;
+ p_limbs = CHARS_TO_LIMBS(sizeof(curve25519_p));
+ } else {
+ p = (mbedtls_mpi_uint *) curve25519_n;
+ p_limbs = CHARS_TO_LIMBS(sizeof(curve25519_n));
+ }
+ break;
+#endif
+
+#if defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED)
+ case MBEDTLS_ECP_DP_SECP192K1:
+ if (ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_COORDINATE) {
+ p = (mbedtls_mpi_uint *) secp192k1_p;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp192k1_p));
+ } else {
+ p = (mbedtls_mpi_uint *) secp192k1_n;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp192k1_n));
+ }
+ break;
+#endif
+
+#if defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED)
+ case MBEDTLS_ECP_DP_SECP224K1:
+ if (ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_COORDINATE) {
+ p = (mbedtls_mpi_uint *) secp224k1_p;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp224k1_p));
+ } else {
+ p = (mbedtls_mpi_uint *) secp224k1_n;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp224k1_n));
+ }
+ break;
+#endif
+
+#if defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED)
+ case MBEDTLS_ECP_DP_SECP256K1:
+ if (ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_COORDINATE) {
+ p = (mbedtls_mpi_uint *) secp256k1_p;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp256k1_p));
+ } else {
+ p = (mbedtls_mpi_uint *) secp256k1_n;
+ p_limbs = CHARS_TO_LIMBS(sizeof(secp256k1_n));
+ }
+ break;
+#endif
+
+#if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
+ case MBEDTLS_ECP_DP_CURVE448:
+ if (ctype == (mbedtls_ecp_curve_type) MBEDTLS_ECP_MOD_COORDINATE) {
+ p = (mbedtls_mpi_uint *) curve448_p;
+ p_limbs = CHARS_TO_LIMBS(sizeof(curve448_p));
+ } else {
+ p = (mbedtls_mpi_uint *) curve448_n;
+ p_limbs = CHARS_TO_LIMBS(sizeof(curve448_n));
+ }
+ break;
+#endif
+
+ default:
+ case MBEDTLS_ECP_DP_NONE:
+ return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
+ }
+
+ if (mbedtls_mpi_mod_modulus_setup(N, p, p_limbs,
+ MBEDTLS_MPI_MOD_REP_MONTGOMERY)) {
+ return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
+ }
+ return 0;
+}
+#endif /* MBEDTLS_TEST_HOOKS */
+#endif /* !MBEDTLS_ECP_ALT */
#endif /* MBEDTLS_ECP_C */