diff --git a/oqsprov/oqsprov_keys.c b/oqsprov/oqsprov_keys.c
index fcfe4f5e..357f4d44 100644
--- a/oqsprov/oqsprov_keys.c
+++ b/oqsprov/oqsprov_keys.c
@@ -695,6 +695,7 @@ static OQSX_KEY *oqsx_key_op(const X509_ALGOR *palg, const unsigned char *p,
                             ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
                             goto err_key_op;
                         }
+                        key->privkeylen_cmp[i] = privlen;
                     } else
                         privlen = key->privkeylen_cmp[i];
                 } else { // PQC key
@@ -883,16 +884,18 @@ static int oqsx_key_recreate_classickey(OQSX_KEY *key, oqsx_key_op_t op)
                 if (get_oqsname_fromtls(name) == 0) {
                     const unsigned char *enc_privkey = key->comp_privkey[i];
                     if (!key->oqsx_provider_ctx.oqsx_evp_ctx->evp_info
-                             ->raw_key_support)
+                             ->raw_key_support) {
+                        EVP_PKEY *npk;
                         key->classical_pkey = d2i_PrivateKey(
                             key->oqsx_provider_ctx.oqsx_evp_ctx->evp_info
                                 ->keytype,
                             NULL, &enc_privkey, key->privkeylen_cmp[i]);
-                    else
+                    } else {
                         key->classical_pkey = EVP_PKEY_new_raw_private_key(
                             key->oqsx_provider_ctx.oqsx_evp_ctx->evp_info
                                 ->keytype,
                             NULL, enc_privkey, key->privkeylen_cmp[i]);
+                    }
                     if (!key->classical_pkey) {
                         ERR_raise(ERR_LIB_USER, OQSPROV_R_INVALID_ENCODING);
                         OPENSSL_free(name);
@@ -1072,7 +1075,7 @@ OQSX_KEY *oqsx_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO *p8inf,
     STACK_OF(ASN1_TYPE) *sk = NULL;
     ASN1_TYPE *aType = NULL;
     unsigned char *concat_key, *buf;
-    int count, aux, i, buflen, rsa_diff = 0;
+    int count, aux, i, buflen, key_diff = 0;
 
     if (!PKCS8_pkey_get0(NULL, &p, &plen, &palg, p8inf))
         return 0;
@@ -1094,13 +1097,17 @@ OQSX_KEY *oqsx_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO *p8inf,
             return NULL;
         } else {
             count = sk_ASN1_TYPE_num(sk);
+            plen = 2 * plen; // get more than necessary in case its needed
             concat_key = OPENSSL_zalloc(plen);
             PKCS8_PRIV_KEY_INFO *p8inf_internal = NULL;
+            const X509_ALGOR *palg_internal;
+            int keytype, nid;
 
             aux = 0;
             for (i = 0; i < count; i++) {
                 aType = sk_ASN1_TYPE_pop(sk);
                 p8inf_internal = PKCS8_PRIV_KEY_INFO_new();
+                nid = 1;
                 char *name;
                 if ((name
                      = get_cmpname(OBJ_obj2nid(palg->algorithm), count - 1 - i))
@@ -1118,7 +1125,7 @@ OQSX_KEY *oqsx_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO *p8inf,
 
                 p8inf_internal
                     = d2i_PKCS8_PRIV_KEY_INFO(&p8inf_internal, &buf2, buflen);
-                if (!PKCS8_pkey_get0(NULL, &buf, &buflen, NULL,
+                if (!PKCS8_pkey_get0(NULL, &buf, &buflen, &palg_internal,
                                      p8inf_internal)) {
                     OPENSSL_free(name);
                     ASN1_TYPE_free(aType);
@@ -1128,17 +1135,63 @@ OQSX_KEY *oqsx_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO *p8inf,
                     return NULL;
                 }
 
-                aux += buflen;
-                memcpy(concat_key + plen - 1 - aux, buf, buflen);
+                keytype = OBJ_obj2nid(palg_internal->algorithm);
+
+                // Checking OPTIONAL params on EC
+                if (keytype == EVP_PKEY_EC) {
+                    nid = OBJ_obj2nid(palg_internal->parameter->value.object);
+                    for (int j = 0; j < OSSL_NELEM(nids_sig); j++) {
+                        if ((nids_sig[j].nid == nid)
+                            && (nids_sig[j].length_private_key > buflen)) {
+                            EC_KEY *ec_pkey;
+                            const unsigned char *buf3 = buf;
+                            unsigned char *buf4, *buf5;
+
+                            if (buflen
+                                != nids_sig[j].kex_length_secret
+                                       + 7) { // no ECParameter and no
+                                              // Pubkey
+                                OPENSSL_free(name);
+                                ASN1_TYPE_free(aType);
+                                PKCS8_PRIV_KEY_INFO_free(p8inf_internal);
+                                OPENSSL_clear_free(concat_key, plen);
+                                sk_ASN1_TYPE_free(sk);
+                                return NULL;
+                            }
+                            ec_pkey = EC_KEY_new_by_curve_name(nid);
+                            ec_pkey = d2i_ECPrivateKey(&ec_pkey, &buf3, buflen);
+                            EC_KEY_set_enc_flags(ec_pkey, 0);
+                            buf4 = OPENSSL_malloc(
+                                nids_sig[j].length_private_key);
+                            buf5 = buf4;
+                            buflen = i2d_ECPrivateKey(ec_pkey, &buf5);
+
+                            aux += buflen;
+                            memcpy(concat_key + plen - 1 - aux, buf4, buflen);
+                            nid = 0; // use as flag to not memcpy twice
+
+                            OPENSSL_clear_free(buf4, buflen);
+                            EC_KEY_free(ec_pkey);
+                            break;
+                        }
+                    }
+                }
+
                 // if is a RSA key the actual encoding size might be different
                 // from max size we calculate that difference for to facilitate
                 // the key reconstruction
-                if (!strncmp(name, "rsa", 3) || !strncmp(name, "pss", 3)) {
+                if (keytype == EVP_PKEY_RSA) {
                     if (name[3] == '3') // 3072
-                        rsa_diff = nids_sig[5].length_private_key - buflen;
+                        key_diff = nids_sig[5].length_private_key - buflen;
                     else // 2048
-                        rsa_diff = nids_sig[6].length_private_key - buflen;
+                        key_diff = nids_sig[6].length_private_key - buflen;
                 }
+
+                if (nid) {
+                    aux += buflen;
+                    memcpy(concat_key + plen - 1 - aux, buf, buflen);
+                }
+
                 OPENSSL_free(name);
                 PKCS8_PRIV_KEY_INFO_free(p8inf_internal);
                 ASN1_TYPE_free(aType);
@@ -1146,12 +1199,12 @@ OQSX_KEY *oqsx_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO *p8inf,
 
             p = OPENSSL_memdup(concat_key + plen - 1 - aux, aux);
             OPENSSL_clear_free(concat_key, plen);
-            plen = aux;
+            plen = aux; // update plen to correct size
             sk_ASN1_TYPE_free(sk);
         }
     }
 
-    oqsx = oqsx_key_op(palg, p, plen + rsa_diff, KEY_OP_PRIVATE, libctx, propq);
+    oqsx = oqsx_key_op(palg, p, plen + key_diff, KEY_OP_PRIVATE, libctx, propq);
     if (get_keytype(OBJ_obj2nid(palg->algorithm)) != KEY_TYPE_CMP_SIG) {
         ASN1_OCTET_STRING_free(oct);
     } else {