diff --git a/library/ecp.c b/library/ecp.c
index d9d5425ed..08fbe86c7 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -582,11 +582,9 @@ void mbedtls_ecp_group_free(mbedtls_ecp_group *grp)
     }
 
     if (grp->h != 1) {
-        mbedtls_mpi_free(&grp->P);
         mbedtls_mpi_free(&grp->A);
         mbedtls_mpi_free(&grp->B);
         mbedtls_ecp_point_free(&grp->G);
-        mbedtls_mpi_free(&grp->N);
     }
 
     if (!ecp_group_is_static_comb_table(grp) && grp->T != NULL) {
diff --git a/library/ecp_curves.c b/library/ecp_curves.c
index e62dcea65..727283f73 100644
--- a/library/ecp_curves.c
+++ b/library/ecp_curves.c
@@ -4502,7 +4502,9 @@ static const mbedtls_ecp_point brainpoolP512r1_T[32] = {
 #endif
 #endif /* MBEDTLS_ECP_DP_BP512R1_ENABLED */
 
-#if defined(ECP_LOAD_GROUP)
+
+#if defined(ECP_LOAD_GROUP) || defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) || \
+    defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
 /*
  * Create an MPI from embedded constants
  * (assumes len is an exact multiple of sizeof mbedtls_mpi_uint)
@@ -4513,7 +4515,9 @@ static inline void ecp_mpi_load(mbedtls_mpi *X, const mbedtls_mpi_uint *p, size_
     X->n = len / sizeof(mbedtls_mpi_uint);
     X->p = (mbedtls_mpi_uint *) p;
 }
+#endif
 
+#if defined(ECP_LOAD_GROUP)
 /*
  * Set an MPI to static value 1
  */
@@ -4627,9 +4631,21 @@ static int ecp_mod_p256k1(mbedtls_mpi *);
 #if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED)
 /* Constants used by ecp_use_curve25519() */
 static const mbedtls_mpi_sint curve25519_a24 = 0x01DB42;
-static const unsigned char curve25519_part_of_n[] = {
-    0x14, 0xDE, 0xF9, 0xDE, 0xA2, 0xF7, 0x9C, 0xD6,
-    0x58, 0x12, 0x63, 0x1A, 0x5C, 0xF5, 0xD3, 0xED,
+
+/* P = 2^255 - 19 */
+static const mbedtls_mpi_uint curve25519_p[] = {
+    MBEDTLS_BYTES_TO_T_UINT_8(0xED, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF),
+    MBEDTLS_BYTES_TO_T_UINT_8(0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF),
+    MBEDTLS_BYTES_TO_T_UINT_8(0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF),
+    MBEDTLS_BYTES_TO_T_UINT_8(0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0X7F)
+};
+
+/* N = 2^252 + 27742317777372353535851937790883648493 */
+static const mbedtls_mpi_uint curve25519_n[] = {
+    MBEDTLS_BYTES_TO_T_UINT_8(0XED, 0XD3, 0XF5, 0X5C, 0X1A, 0X63, 0X12, 0X58),
+    MBEDTLS_BYTES_TO_T_UINT_8(0XD6, 0X9C, 0XF7, 0XA2, 0XDE, 0XF9, 0XDE, 0X14),
+    MBEDTLS_BYTES_TO_T_UINT_8(0X00, 0X00, 0X00, 0X00, 0x00, 0x00, 0x00, 0x00),
+    MBEDTLS_BYTES_TO_T_UINT_8(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10)
 };
 
 /*
@@ -4642,16 +4658,11 @@ static int ecp_use_curve25519(mbedtls_ecp_group *grp)
     /* Actually ( A + 2 ) / 4 */
     MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&grp->A, curve25519_a24));
 
-    /* P = 2^255 - 19 */
-    MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&grp->P, 1));
-    MBEDTLS_MPI_CHK(mbedtls_mpi_shift_l(&grp->P, 255));
-    MBEDTLS_MPI_CHK(mbedtls_mpi_sub_int(&grp->P, &grp->P, 19));
+    ecp_mpi_load(&grp->P, curve25519_p, sizeof(curve25519_p));
+
     grp->pbits = mbedtls_mpi_bitlen(&grp->P);
 
-    /* N = 2^252 + 27742317777372353535851937790883648493 */
-    MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&grp->N,
-                                            curve25519_part_of_n, sizeof(curve25519_part_of_n)));
-    MBEDTLS_MPI_CHK(mbedtls_mpi_set_bit(&grp->N, 252, 1));
+    ecp_mpi_load(&grp->N, curve25519_n, sizeof(curve25519_n));
 
     /* Y intentionally not set, since we use x/z coordinates.
      * This is used as a marker to identify Montgomery curves! */
@@ -4674,11 +4685,29 @@ cleanup:
 #if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
 /* Constants used by ecp_use_curve448() */
 static const mbedtls_mpi_sint curve448_a24 = 0x98AA;
-static const unsigned char curve448_part_of_n[] = {
-    0x83, 0x35, 0xDC, 0x16, 0x3B, 0xB1, 0x24,
-    0xB6, 0x51, 0x29, 0xC9, 0x6F, 0xDE, 0x93,
-    0x3D, 0x8D, 0x72, 0x3A, 0x70, 0xAA, 0xDC,
-    0x87, 0x3D, 0x6D, 0x54, 0xA7, 0xBB, 0x0D,
+
+/* P = 2^448 - 2^224 - 1 */
+static const mbedtls_mpi_uint curve448_p[] = {
+    MBEDTLS_BYTES_TO_T_UINT_8(0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF),
+    MBEDTLS_BYTES_TO_T_UINT_8(0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF),
+    MBEDTLS_BYTES_TO_T_UINT_8(0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF),
+    MBEDTLS_BYTES_TO_T_UINT_8(0XFF, 0XFF, 0XFF, 0XFF, 0XFE, 0XFF, 0XFF, 0XFF),
+    MBEDTLS_BYTES_TO_T_UINT_8(0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF),
+    MBEDTLS_BYTES_TO_T_UINT_8(0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF),
+    MBEDTLS_BYTES_TO_T_UINT_8(0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF),
+    MBEDTLS_BYTES_TO_T_UINT_8(0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00)
+};
+
+/* N = 2^446 - 13818066809895115352007386748515426880336692474882178609894547503885 */
+static const mbedtls_mpi_uint curve448_n[] = {
+    MBEDTLS_BYTES_TO_T_UINT_8(0XF3, 0X44, 0X58, 0XAB, 0X92, 0XC2, 0X78, 0X23),
+    MBEDTLS_BYTES_TO_T_UINT_8(0X55, 0X8F, 0XC5, 0X8D, 0X72, 0XC2, 0X6C, 0X21),
+    MBEDTLS_BYTES_TO_T_UINT_8(0X90, 0X36, 0XD6, 0XAE, 0X49, 0XDB, 0X4E, 0XC4),
+    MBEDTLS_BYTES_TO_T_UINT_8(0XE9, 0X23, 0XCA, 0X7C, 0XFF, 0XFF, 0XFF, 0XFF),
+    MBEDTLS_BYTES_TO_T_UINT_8(0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF),
+    MBEDTLS_BYTES_TO_T_UINT_8(0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF),
+    MBEDTLS_BYTES_TO_T_UINT_8(0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0XFF, 0X3F),
+    MBEDTLS_BYTES_TO_T_UINT_8(0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00)
 };
 
 /*
@@ -4686,20 +4715,12 @@ static const unsigned char curve448_part_of_n[] = {
  */
 static int ecp_use_curve448(mbedtls_ecp_group *grp)
 {
-    mbedtls_mpi Ns;
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
 
-    mbedtls_mpi_init(&Ns);
-
     /* Actually ( A + 2 ) / 4 */
     MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&grp->A, curve448_a24));
 
-    /* P = 2^448 - 2^224 - 1 */
-    MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&grp->P, 1));
-    MBEDTLS_MPI_CHK(mbedtls_mpi_shift_l(&grp->P, 224));
-    MBEDTLS_MPI_CHK(mbedtls_mpi_sub_int(&grp->P, &grp->P, 1));
-    MBEDTLS_MPI_CHK(mbedtls_mpi_shift_l(&grp->P, 224));
-    MBEDTLS_MPI_CHK(mbedtls_mpi_sub_int(&grp->P, &grp->P, 1));
+    ecp_mpi_load(&grp->P, curve448_p, sizeof(curve448_p));
     grp->pbits = mbedtls_mpi_bitlen(&grp->P);
 
     /* Y intentionally not set, since we use x/z coordinates.
@@ -4708,17 +4729,12 @@ static int ecp_use_curve448(mbedtls_ecp_group *grp)
     MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&grp->G.Z, 1));
     mbedtls_mpi_free(&grp->G.Y);
 
-    /* N = 2^446 - 13818066809895115352007386748515426880336692474882178609894547503885 */
-    MBEDTLS_MPI_CHK(mbedtls_mpi_set_bit(&grp->N, 446, 1));
-    MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&Ns,
-                                            curve448_part_of_n, sizeof(curve448_part_of_n)));
-    MBEDTLS_MPI_CHK(mbedtls_mpi_sub_mpi(&grp->N, &grp->N, &Ns));
+    ecp_mpi_load(&grp->N, curve448_n, sizeof(curve448_n));
 
     /* Actually, the required msb for private keys */
     grp->nbits = 447;
 
 cleanup:
-    mbedtls_mpi_free(&Ns);
     if (ret != 0) {
         mbedtls_ecp_group_free(grp);
     }
diff --git a/library/pkparse.c b/library/pkparse.c
index 990b55452..ccca692b7 100644
--- a/library/pkparse.c
+++ b/library/pkparse.c
@@ -429,7 +429,18 @@ static int pk_group_id_from_specified(const mbedtls_asn1_buf *params,
     ret = pk_group_id_from_group(&grp, grp_id);
 
 cleanup:
-    mbedtls_ecp_group_free(&grp);
+    /* The API respecting lifecycle for mbedtls_ecp_group struct is
+     * _init(), _load() and _free(). In pk_group_id_from_specified() the
+     * temporary grp breaks that flow and it's members are populated
+     * by pk_group_id_from_group(). As such mbedtls_ecp_group_free()
+     * which is assuming a group populated by _setup() may not clean-up
+     * properly -> Manually free it's members.
+     */
+    mbedtls_mpi_free(&grp.N);
+    mbedtls_mpi_free(&grp.P);
+    mbedtls_mpi_free(&grp.A);
+    mbedtls_mpi_free(&grp.B);
+    mbedtls_ecp_point_free(&grp.G);
 
     return ret;
 }