Fixed accessing of ASN1_OCTET_STRING members with getters due to structure opacification

Signed-off-by: RoyalReafer <royalsmods@hotmail.com>

Author: royalsreafer

src/tpm2-provider-pkey.c

@@ -138,7 +138,7 @@ tpm2_keydata_read(BIO *bin, TPM2_KEYDATA *keydata, TPM2_PKEY_FORMAT format)
     if (tpk == NULL)
         return 0;
 
-    if (tpk->privkey->length == sizeof(keydata->handle) && tpk->privkey->data[0] == TPM2_HT_PERSISTENT)
+    if (ASN1_STRING_length(tpk->privkey) == sizeof(keydata->handle) && ASN1_STRING_get0_data(tpk->privkey)[0] == TPM2_HT_PERSISTENT)
         keydata->privatetype = KEY_TYPE_HANDLE;
     else
         keydata->privatetype = KEY_TYPE_BLOB;
@@ -161,19 +161,19 @@ tpm2_keydata_read(BIO *bin, TPM2_KEYDATA *keydata, TPM2_PKEY_FORMAT format)
         goto error;
 
     if (keydata->privatetype == KEY_TYPE_HANDLE) {
-        if (Tss2_MU_TPM2_HANDLE_Unmarshal(tpk->privkey->data,
-                                          tpk->privkey->length, NULL,
+        if (Tss2_MU_TPM2_HANDLE_Unmarshal(ASN1_STRING_get0_data(tpk->privkey),
+                                          ASN1_STRING_length(tpk->privkey), NULL,
                                           &keydata->handle))
             goto error;
     } else {
-        if (Tss2_MU_TPM2B_PRIVATE_Unmarshal(tpk->privkey->data,
-                                            tpk->privkey->length, NULL,
+        if (Tss2_MU_TPM2B_PRIVATE_Unmarshal(ASN1_STRING_get0_data(tpk->privkey),
+                                            ASN1_STRING_length(tpk->privkey), NULL,
                                             &keydata->priv))
             goto error;
     }
 
-    if (Tss2_MU_TPM2B_PUBLIC_Unmarshal(tpk->pubkey->data,
-                                       tpk->pubkey->length, NULL,
+    if (Tss2_MU_TPM2B_PUBLIC_Unmarshal(ASN1_STRING_get0_data(tpk->pubkey),
+                                       ASN1_STRING_length(tpk->pubkey), NULL,
                                        &keydata->pub))
         goto error;