diff --git a/ChangeLog.d/fix-oid-to-string-bugs.txt b/ChangeLog.d/fix-oid-to-string-bugs.txt
new file mode 100644
index 0000000..799f444
--- /dev/null
+++ b/ChangeLog.d/fix-oid-to-string-bugs.txt
@@ -0,0 +1,6 @@
+Bugfix
+   * Fix bug in conversion from OID to string in
+     mbedtls_oid_get_numeric_string(). OIDs such as 2.40.0.25 are now printed
+     correctly.
+   * Reject OIDs with overlong-encoded subidentifiers when converting
+     OID-to-string.
diff --git a/include/mbedtls/ecp.h b/include/mbedtls/ecp.h
index 1590ef2..b6144d9 100644
--- a/include/mbedtls/ecp.h
+++ b/include/mbedtls/ecp.h
@@ -141,6 +141,15 @@
     MBEDTLS_ECP_TYPE_MONTGOMERY,           /* y^2 = x^3 + a x^2 + x    */
 } mbedtls_ecp_curve_type;
 
+/*
+ * Curve modulus types
+ */
+typedef enum {
+    MBEDTLS_ECP_MOD_NONE = 0,
+    MBEDTLS_ECP_MOD_COORDINATE,
+    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..b352e76 100644
--- a/library/ecp_curves.c
+++ b/library/ecp_curves.c
@@ -5534,6 +5534,188 @@
 }
 #endif /* MBEDTLS_ECP_DP_SECP256K1_ENABLED */
 
-#endif /* !MBEDTLS_ECP_ALT */
+#if defined(MBEDTLS_TEST_HOOKS)
+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_ERROR_CORRUPTION_DETECTED;
+    }
+    return 0;
+}
+#endif /* MBEDTLS_TEST_HOOKS */
+#endif /* !MBEDTLS_ECP_ALT */
 #endif /* MBEDTLS_ECP_C */
diff --git a/library/ecp_invasive.h b/library/ecp_invasive.h
index 3d1321c..aba7cca 100644
--- a/library/ecp_invasive.h
+++ b/library/ecp_invasive.h
@@ -28,6 +28,7 @@
 
 #include "common.h"
 #include "mbedtls/bignum.h"
+#include "bignum_mod.h"
 #include "mbedtls/ecp.h"
 
 #if defined(MBEDTLS_TEST_HOOKS) && defined(MBEDTLS_ECP_C)
@@ -117,6 +118,28 @@
 
 #endif /* MBEDTLS_ECP_DP_SECP521R1_ENABLED */
 
+/** Initialise a modulus with hard-coded const curve data.
+ *
+ * \note            The caller is responsible for the \p N modulus' memory.
+ *                  mbedtls_mpi_mod_modulus_free(&N) should be invoked at the
+ *                  end of its lifecycle.
+ *
+ * \param[in,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.
+ *
+ */
+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);
+
 #endif /* MBEDTLS_TEST_HOOKS && MBEDTLS_ECP_C */
 
 #endif /* MBEDTLS_ECP_INVASIVE_H */
diff --git a/library/oid.c b/library/oid.c
index e7c1224..86214b2 100644
--- a/library/oid.c
+++ b/library/oid.c
@@ -834,21 +834,55 @@
     p = buf;
     n = size;
 
-    /* First byte contains first two dots */
-    if (oid->len > 0) {
-        ret = mbedtls_snprintf(p, n, "%d.%d", oid->p[0] / 40, oid->p[0] % 40);
-        OID_SAFE_SNPRINTF;
+    /* First subidentifier contains first two OID components */
+    i = 0;
+    value = 0;
+    if ((oid->p[0]) == 0x80) {
+        /* Overlong encoding is not allowed */
+        return MBEDTLS_ERR_ASN1_INVALID_DATA;
     }
 
-    value = 0;
-    for (i = 1; i < oid->len; i++) {
+    while (i < oid->len && ((oid->p[i] & 0x80) != 0)) {
         /* Prevent overflow in value. */
-        if (((value << 7) >> 7) != value) {
-            return MBEDTLS_ERR_OID_BUF_TOO_SMALL;
+        if (value > (UINT_MAX >> 7)) {
+            return MBEDTLS_ERR_ASN1_INVALID_DATA;
+        }
+
+        value |= oid->p[i] & 0x7F;
+        value <<= 7;
+        i++;
+    }
+    if (i >= oid->len) {
+        return MBEDTLS_ERR_ASN1_OUT_OF_DATA;
+    }
+    /* Last byte of first subidentifier */
+    value |= oid->p[i] & 0x7F;
+    i++;
+
+    unsigned int component1 = value / 40;
+    if (component1 > 2) {
+        /* The first component can only be 0, 1 or 2.
+         * If oid->p[0] / 40 is greater than 2, the leftover belongs to
+         * the second component. */
+        component1 = 2;
+    }
+    unsigned int component2 = value - (40 * component1);
+    ret = mbedtls_snprintf(p, n, "%u.%u", component1, component2);
+    OID_SAFE_SNPRINTF;
+
+    value = 0;
+    for (; i < oid->len; i++) {
+        /* Prevent overflow in value. */
+        if (value > (UINT_MAX >> 7)) {
+            return MBEDTLS_ERR_ASN1_INVALID_DATA;
+        }
+        if ((value == 0) && ((oid->p[i]) == 0x80)) {
+            /* Overlong encoding is not allowed */
+            return MBEDTLS_ERR_ASN1_INVALID_DATA;
         }
 
         value <<= 7;
-        value += oid->p[i] & 0x7F;
+        value |= oid->p[i] & 0x7F;
 
         if (!(oid->p[i] & 0x80)) {
             /* Last byte */
diff --git a/tests/suites/test_suite_constant_time.function b/tests/suites/test_suite_constant_time.function
index 14dc8ae..a2bf396 100644
--- a/tests/suites/test_suite_constant_time.function
+++ b/tests/suites/test_suite_constant_time.function
@@ -18,7 +18,7 @@
 /* BEGIN_CASE */
 void mbedtls_ct_memcmp_null()
 {
-    uint32_t x;
+    uint32_t x = 0;
     TEST_ASSERT(mbedtls_ct_memcmp(&x, NULL, 0) == 0);
     TEST_ASSERT(mbedtls_ct_memcmp(NULL, &x, 0) == 0);
     TEST_ASSERT(mbedtls_ct_memcmp(NULL, NULL, 0) == 0);
diff --git a/tests/suites/test_suite_ecp.data b/tests/suites/test_suite_ecp.data
index 9a13793..3fbad92 100644
--- a/tests/suites/test_suite_ecp.data
+++ b/tests/suites/test_suite_ecp.data
@@ -1038,3 +1038,115 @@
 ECP check order for CURVE448
 depends_on:MBEDTLS_ECP_DP_CURVE448_ENABLED
 ecp_check_order:MBEDTLS_ECP_DP_CURVE448:"3fffffffffffffffffffffffffffffffffffffffffffffffffffffff7cca23e9c44edb49aed63690216cc2728dc58f552378c292ab5844f3"
+
+ecp_setup #1 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_SECP192R1)
+depends_on:MBEDTLS_ECP_DP_SECP192R1_ENABLED
+ecp_mod_setup:"fffffffffffffffffffffffffffffffeffffffffffffffff":MBEDTLS_ECP_DP_SECP192R1:MBEDTLS_ECP_MOD_COORDINATE:0
+
+ecp_setup #2 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_SECP224R1)
+depends_on:MBEDTLS_ECP_DP_SECP224R1_ENABLED
+ecp_mod_setup:"00000000ffffffffffffffffffffffffffffffff000000000000000000000001":MBEDTLS_ECP_DP_SECP224R1:MBEDTLS_ECP_MOD_COORDINATE:0
+
+ecp_setup #3 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_SECP256R1)
+depends_on:MBEDTLS_ECP_DP_SECP256R1_ENABLED
+ecp_mod_setup:"ffffffff00000001000000000000000000000000ffffffffffffffffffffffff":MBEDTLS_ECP_DP_SECP256R1:MBEDTLS_ECP_MOD_COORDINATE:0
+
+ecp_setup #4 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_SECP384R1)
+depends_on:MBEDTLS_ECP_DP_SECP384R1_ENABLED
+ecp_mod_setup:"fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffeffffffff0000000000000000ffffffff":MBEDTLS_ECP_DP_SECP384R1:MBEDTLS_ECP_MOD_COORDINATE:0
+
+ecp_setup #5 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_SECP521R1)
+depends_on:MBEDTLS_ECP_DP_SECP521R1_ENABLED
+ecp_mod_setup:"1ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff":MBEDTLS_ECP_DP_SECP521R1:MBEDTLS_ECP_MOD_COORDINATE:0
+
+ecp_setup #6 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_BP256R1)
+depends_on:MBEDTLS_ECP_DP_BP256R1_ENABLED
+ecp_mod_setup:"a9fb57dba1eea9bc3e660a909d838d726e3bf623d52620282013481d1f6e5377":MBEDTLS_ECP_DP_BP256R1:MBEDTLS_ECP_MOD_COORDINATE:0
+
+ecp_setup #7 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_BP384R1)
+depends_on:MBEDTLS_ECP_DP_BP384R1_ENABLED
+ecp_mod_setup:"8cb91e82a3386d280f5d6f7e50e641df152f7109ed5456b412b1da197fb71123acd3a729901d1a71874700133107ec53":MBEDTLS_ECP_DP_BP384R1:MBEDTLS_ECP_MOD_COORDINATE:0
+
+ecp_setup #8 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_BP512R1)
+depends_on:MBEDTLS_ECP_DP_BP512R1_ENABLED
+ecp_mod_setup:"aadd9db8dbe9c48b3fd4e6ae33c9fc07cb308db3b3c9d20ed6639cca703308717d4d9b009bc66842aecda12ae6a380e62881ff2f2d82c68528aa6056583a48f3":MBEDTLS_ECP_DP_BP512R1:MBEDTLS_ECP_MOD_COORDINATE:0
+
+ecp_setup #9 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_CURVE25519)
+depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+ecp_mod_setup:"7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffed":MBEDTLS_ECP_DP_CURVE25519:MBEDTLS_ECP_MOD_COORDINATE:0
+
+ecp_setup #10 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_SECP192K1)
+depends_on:MBEDTLS_ECP_DP_SECP192K1_ENABLED
+ecp_mod_setup:"fffffffffffffffffffffffffffffffffffffffeffffee37":MBEDTLS_ECP_DP_SECP192K1:MBEDTLS_ECP_MOD_COORDINATE:0
+
+ecp_setup #11 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_SECP224K1)
+depends_on:MBEDTLS_ECP_DP_SECP224K1_ENABLED
+ecp_mod_setup:"fffffffffffffffffffffffffffffffffffffffffffffffeffffe56d":MBEDTLS_ECP_DP_SECP224K1:MBEDTLS_ECP_MOD_COORDINATE:0
+
+ecp_setup #12 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_SECP256K1)
+depends_on:MBEDTLS_ECP_DP_SECP256K1_ENABLED
+ecp_mod_setup:"fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f":MBEDTLS_ECP_DP_SECP256K1:MBEDTLS_ECP_MOD_COORDINATE:0
+
+ecp_setup #13 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_CURVE448)
+depends_on:MBEDTLS_ECP_DP_CURVE448_ENABLED
+ecp_mod_setup:"000000000000000fffffffffffffffffffffffffffffffffffffffffffffffffffffffeffffffffffffffffffffffffffffffffffffffffffffffffffffffff":MBEDTLS_ECP_DP_CURVE448:MBEDTLS_ECP_MOD_COORDINATE:0
+
+ecp_setup #14 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP192R1)
+depends_on:MBEDTLS_ECP_DP_SECP192R1_ENABLED
+ecp_mod_setup:"ffffffffffffffffffffffff99def836146bc9b1b4d22831":MBEDTLS_ECP_DP_SECP192R1:MBEDTLS_ECP_MOD_SCALAR:0
+
+ecp_setup #15 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP224R1)
+depends_on:MBEDTLS_ECP_DP_SECP224R1_ENABLED
+ecp_mod_setup:"ffffffffffffffffffffffffffff16a2e0b8f03e13dd29455c5c2a3d":MBEDTLS_ECP_DP_SECP224R1:MBEDTLS_ECP_MOD_SCALAR:0
+
+ecp_setup #16 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP256R1)
+depends_on:MBEDTLS_ECP_DP_SECP256R1_ENABLED
+ecp_mod_setup:"ffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551":MBEDTLS_ECP_DP_SECP256R1:MBEDTLS_ECP_MOD_SCALAR:0
+
+ecp_setup #17 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP384R1)
+depends_on:MBEDTLS_ECP_DP_SECP384R1_ENABLED
+ecp_mod_setup:"ffffffffffffffffffffffffffffffffffffffffffffffffc7634d81f4372ddf581a0db248b0a77aecec196accc52973":MBEDTLS_ECP_DP_SECP384R1:MBEDTLS_ECP_MOD_SCALAR:0
+
+ecp_setup #18 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP521R1)
+depends_on:MBEDTLS_ECP_DP_SECP521R1_ENABLED
+ecp_mod_setup:"1fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffa51868783bf2f966b7fcc0148f709a5d03bb5c9b8899c47aebb6fb71e91386409":MBEDTLS_ECP_DP_SECP521R1:MBEDTLS_ECP_MOD_SCALAR:0
+
+ecp_setup #19 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_BP256R1)
+depends_on:MBEDTLS_ECP_DP_BP256R1_ENABLED
+ecp_mod_setup:"a9fb57dba1eea9bc3e660a909d838d718c397aa3b561a6f7901e0e82974856a7":MBEDTLS_ECP_DP_BP256R1:MBEDTLS_ECP_MOD_SCALAR:0
+
+ecp_setup #20 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_BP384R1)
+depends_on:MBEDTLS_ECP_DP_BP384R1_ENABLED
+ecp_mod_setup:"8cb91e82a3386d280f5d6f7e50e641df152f7109ed5456b412b1da197fb71123acd3a729901d1a71874700133107ec53":MBEDTLS_ECP_DP_BP384R1:MBEDTLS_ECP_MOD_COORDINATE:0
+
+ecp_setup #21 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_BP512R1)
+depends_on:MBEDTLS_ECP_DP_BP512R1_ENABLED
+ecp_mod_setup:"aadd9db8dbe9c48b3fd4e6ae33c9fc07cb308db3b3c9d20ed6639cca70330870553e5c414ca92619418661197fac10471db1d381085ddaddb58796829ca90069":MBEDTLS_ECP_DP_BP512R1:MBEDTLS_ECP_MOD_SCALAR:0
+
+ecp_setup #22 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_CURVE25519)
+depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+ecp_mod_setup:"1000000000000000000000000000000014def9dea2f79cd65812631a5cf5d3ed":MBEDTLS_ECP_DP_CURVE25519:MBEDTLS_ECP_MOD_SCALAR:0
+
+ecp_setup #23 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP192K1)
+depends_on:MBEDTLS_ECP_DP_SECP192K1_ENABLED
+ecp_mod_setup:"fffffffffffffffffffffffe26f2fc170f69466a74defd8d":MBEDTLS_ECP_DP_SECP192K1:MBEDTLS_ECP_MOD_SCALAR:0
+
+ecp_setup #24 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP224K1)
+depends_on:MBEDTLS_ECP_DP_SECP224K1_ENABLED
+ecp_mod_setup:"000000010000000000000000000000000001dce8d2ec6184caf0a971769fb1f7":MBEDTLS_ECP_DP_SECP224K1:MBEDTLS_ECP_MOD_SCALAR:0
+
+ecp_setup #25 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP256K1)
+depends_on:MBEDTLS_ECP_DP_SECP256K1_ENABLED
+ecp_mod_setup:"fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141":MBEDTLS_ECP_DP_SECP256K1:MBEDTLS_ECP_MOD_SCALAR:0
+
+ecp_setup #26 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_CURVE448)
+depends_on:MBEDTLS_ECP_DP_CURVE448_ENABLED
+ecp_mod_setup:"0000000000000003fffffffffffffffffffffffffffffffffffffffffffffffffffffff7cca23e9c44edb49aed63690216cc2728dc58f552378c292ab5844f3":MBEDTLS_ECP_DP_CURVE448:MBEDTLS_ECP_MOD_SCALAR:0
+
+ecp_setup_negative_test #27 Invalid Moduli Type
+depends_on:MBEDTLS_ECP_DP_CURVE448_ENABLED
+ecp_mod_setup:"fffffffffffffffffffffffe26f2fc17f69466a74defd8d":MBEDTLS_ECP_DP_CURVE448:MBEDTLS_ECP_MOD_NONE:MBEDTLS_ERR_ECP_BAD_INPUT_DATA
+
+ecp_setup_negative_test #28 Invalid Curve Type
+depends_on:MBEDTLS_ECP_DP_CURVE448_ENABLED
+ecp_mod_setup:"fffffffffffffffffffffffe26f2fc17f69466a74defd8d":MBEDTLS_ECP_DP_NONE:MBEDTLS_ECP_MOD_SCALAR:MBEDTLS_ERR_ECP_BAD_INPUT_DATA
diff --git a/tests/suites/test_suite_ecp.function b/tests/suites/test_suite_ecp.function
index 4e74d9b..96537c2 100644
--- a/tests/suites/test_suite_ecp.function
+++ b/tests/suites/test_suite_ecp.function
@@ -1,5 +1,6 @@
 /* BEGIN_HEADER */
 #include "mbedtls/ecp.h"
+#include "ecp_invasive.h"
 #include "mbedtls/ecdsa.h"
 #include "mbedtls/ecdh.h"
 
@@ -1387,3 +1388,43 @@
     mbedtls_free(N);
 }
 /* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_TEST_HOOKS */
+void ecp_mod_setup(char *input_A, int id, int ctype, int iret)
+{
+    int ret;
+    mbedtls_mpi_mod_modulus m;
+    mbedtls_mpi_mod_modulus_init(&m);
+    mbedtls_mpi_uint *p = NULL;
+    size_t p_limbs;
+    size_t bytes;
+
+    TEST_EQUAL(mbedtls_test_read_mpi_core(&p, &p_limbs, input_A), 0);
+
+    ret = mbedtls_ecp_modulus_setup(&m, id, ctype);
+    TEST_EQUAL(ret, iret);
+
+    if (ret == 0) {
+
+        /* Test for limb sizes */
+        TEST_EQUAL(m.limbs, p_limbs);
+        bytes = p_limbs * sizeof(mbedtls_mpi_uint);
+
+        /* Test for validity of moduli by the presence of Montgomery consts */
+
+        TEST_ASSERT(m.rep.mont.mm != 0);
+        TEST_ASSERT(m.rep.mont.rr != NULL);
+
+
+        /* Compare output byte-by-byte */
+        ASSERT_COMPARE(p, bytes, m.p, bytes);
+
+        /* Test for user free-ing allocated memory */
+        mbedtls_mpi_mod_modulus_free(&m);
+    }
+
+exit:
+    mbedtls_mpi_mod_modulus_free(&m);
+    mbedtls_free(p);
+}
+/* END_CASE */
diff --git a/tests/suites/test_suite_oid.data b/tests/suites/test_suite_oid.data
index 1738841..b9fa654 100644
--- a/tests/suites/test_suite_oid.data
+++ b/tests/suites/test_suite_oid.data
@@ -89,3 +89,33 @@
 OID hash id - invalid oid
 oid_get_md_alg_id:"2B864886f70d0204":-1
 
+OID get numeric string - hardware module name
+oid_get_numeric_string:"2B06010505070804":0:"1.3.6.1.5.5.7.8.4"
+
+OID get numeric string - multi-byte subidentifier
+oid_get_numeric_string:"29903C":0:"1.1.2108"
+
+OID get numeric string - second component greater than 39
+oid_get_numeric_string:"81010000863A00":0:"2.49.0.0.826.0"
+
+OID get numeric string - multi-byte first subidentifier
+oid_get_numeric_string:"8837":0:"2.999"
+
+OID get numeric string - empty oid buffer
+oid_get_numeric_string:"":MBEDTLS_ERR_ASN1_OUT_OF_DATA:""
+
+OID get numeric string - no final / all bytes have top bit set
+oid_get_numeric_string:"818181":MBEDTLS_ERR_ASN1_OUT_OF_DATA:""
+
+# Encodes the number 0x0400000000 as a subidentifier which overflows 32-bits
+OID get numeric string - 32-bit overflow
+oid_get_numeric_string:"C080808000":MBEDTLS_ERR_ASN1_INVALID_DATA:""
+
+OID get numeric string - 32-bit overflow, second subidentifier
+oid_get_numeric_string:"2BC080808000":MBEDTLS_ERR_ASN1_INVALID_DATA:""
+
+OID get numeric string - overlong encoding
+oid_get_numeric_string:"8001":MBEDTLS_ERR_ASN1_INVALID_DATA:""
+
+OID get numeric string - overlong encoding, second subidentifier
+oid_get_numeric_string:"2B8001":MBEDTLS_ERR_ASN1_INVALID_DATA:""
diff --git a/tests/suites/test_suite_oid.function b/tests/suites/test_suite_oid.function
index 687b216..3004b65 100644
--- a/tests/suites/test_suite_oid.function
+++ b/tests/suites/test_suite_oid.function
@@ -96,3 +96,24 @@
     }
 }
 /* END_CASE */
+
+/* BEGIN_CASE */
+void oid_get_numeric_string(data_t *oid, int error_ret, char *result_str)
+{
+    char buf[256];
+    mbedtls_asn1_buf input_oid = { 0, 0, NULL };
+    int ret;
+
+    input_oid.tag = MBEDTLS_ASN1_OID;
+    input_oid.p = oid->x;
+    input_oid.len = oid->len;
+
+    ret = mbedtls_oid_get_numeric_string(buf, sizeof(buf), &input_oid);
+
+    if (error_ret == 0) {
+        TEST_ASSERT(strcmp(buf, result_str) == 0);
+    } else {
+        TEST_EQUAL(ret, error_ret);
+    }
+}
+/* END_CASE */
diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index 961b25a..4545a53 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -2558,7 +2558,7 @@
 x509_oid_numstr:"2a864886f70d":"1.2.840.113549":15:14
 
 X509 OID numstring #5 (arithmetic overflow)
-x509_oid_numstr:"2a8648f9f8f7f6f5f4f3f2f1f001":"":100:MBEDTLS_ERR_OID_BUF_TOO_SMALL
+x509_oid_numstr:"2a8648f9f8f7f6f5f4f3f2f1f001":"":100:MBEDTLS_ERR_ASN1_INVALID_DATA
 
 X509 CRT keyUsage #1 (no extension, expected KU)
 depends_on:MBEDTLS_RSA_C:MBEDTLS_HAS_ALG_SHA_1_VIA_MD_OR_PSA_BASED_ON_USE_PSA