diff --git a/src/libsodium/crypto_core/curve25519/ref10/fe_25_5/constants.h b/src/libsodium/crypto_core/curve25519/ref10/fe_25_5/constants.h
new file mode 100644
index 00000000..0548abed
--- /dev/null
+++ b/src/libsodium/crypto_core/curve25519/ref10/fe_25_5/constants.h
@@ -0,0 +1,15 @@
+/* 37095705934669439343138083508754565189542113879843219016388785533085940283555 */
+static const fe d = {
+    -10913610, 13857413, -15372611, 6949391,   114729, -8787816,  -6275908, -3247719,  -18696448, -12055116
+};
+
+/* 2 * d =
+ * 16295367250680780974490674513165176452449235426866156013048779062215315747161
+ */
+static const fe d2 = {
+    -21827239, -5839606,  -30745221, 13898782, 229458, 15978800,  -12551817, -6495438,  29715968, 9444199 };
+
+/* sqrt(-1) */
+static const fe sqrtm1 = {
+    -32595792, -7943725,  9377950,  3500415, 12389472, -272473,   -25146209, -2005654, 326686,  11406482
+};
diff --git a/src/libsodium/crypto_core/curve25519/ref10/fe_51/constants.h b/src/libsodium/crypto_core/curve25519/ref10/fe_51/constants.h
new file mode 100644
index 00000000..92509f14
--- /dev/null
+++ b/src/libsodium/crypto_core/curve25519/ref10/fe_51/constants.h
@@ -0,0 +1,16 @@
+/* 37095705934669439343138083508754565189542113879843219016388785533085940283555 */
+static const fe d = {
+    929955233495203, 466365720129213, 1662059464998953, 2033849074728123, 1442794654840575
+};
+
+/* 2 * d =
+ * 16295367250680780974490674513165176452449235426866156013048779062215315747161
+ */
+static const fe d2 = {
+    1859910466990425, 932731440258426, 1072319116312658, 1815898335770999, 633789495995903
+};
+
+/* sqrt(-1) */
+static const fe sqrtm1 = {
+    1718705420411056, 234908883556509, 2233514472574048, 2117202627021982, 765476049583133
+};