1 files changed, 126 insertions, 0 deletions
diff --git a/security/nss/lib/freebl/ecl/ecp_25519.c b/security/nss/lib/freebl/ecl/ecp_25519.c
new file mode 100644
index 0000000000..ceecd2aced
--- /dev/null
+++ b/security/nss/lib/freebl/ecl/ecp_25519.c
@@ -0,0 +1,126 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* curve 25519 https://www.rfc-editor.org/rfc/rfc7748.txt */
+
+#ifdef FREEBL_NO_DEPEND
+#include "../stubs.h"
+#endif
+
+#include "ecl-priv.h"
+#include "ecp.h"
+#include "mpi.h"
+#include "mplogic.h"
+#include "mpi-priv.h"
+#include "secmpi.h"
+#include "secitem.h"
+#include "secport.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+/*
+ * point validation is not necessary in general. But this checks a point (px)
+ * against some known bad values.
+ */
+SECStatus
+ec_Curve25519_pt_validate(const SECItem *px)
+{
+    PRUint8 *p;
+    PRUint64 i;
+    PRUint8 forbiddenValues[12][32] = {
+        { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+        { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+        { 0xe0, 0xeb, 0x7a, 0x7c, 0x3b, 0x41, 0xb8, 0xae,
+          0x16, 0x56, 0xe3, 0xfa, 0xf1, 0x9f, 0xc4, 0x6a,
+          0xda, 0x09, 0x8d, 0xeb, 0x9c, 0x32, 0xb1, 0xfd,
+          0x86, 0x62, 0x05, 0x16, 0x5f, 0x49, 0xb8, 0x00 },
+        { 0x5f, 0x9c, 0x95, 0xbc, 0xa3, 0x50, 0x8c, 0x24,
+          0xb1, 0xd0, 0xb1, 0x55, 0x9c, 0x83, 0xef, 0x5b,
+          0x04, 0x44, 0x5c, 0xc4, 0x58, 0x1c, 0x8e, 0x86,
+          0xd8, 0x22, 0x4e, 0xdd, 0xd0, 0x9f, 0x11, 0x57 },
+        { 0xec, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f },
+        { 0xed, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f },
+        { 0xee, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f },
+        { 0xcd, 0xeb, 0x7a, 0x7c, 0x3b, 0x41, 0xb8, 0xae,
+          0x16, 0x56, 0xe3, 0xfa, 0xf1, 0x9f, 0xc4, 0x6a,
+          0xda, 0x09, 0x8d, 0xeb, 0x9c, 0x32, 0xb1, 0xfd,
+          0x86, 0x62, 0x05, 0x16, 0x5f, 0x49, 0xb8, 0x80 },
+        { 0x4c, 0x9c, 0x95, 0xbc, 0xa3, 0x50, 0x8c, 0x24,
+          0xb1, 0xd0, 0xb1, 0x55, 0x9c, 0x83, 0xef, 0x5b,
+          0x04, 0x44, 0x5c, 0xc4, 0x58, 0x1c, 0x8e, 0x86,
+          0xd8, 0x22, 0x4e, 0xdd, 0xd0, 0x9f, 0x11, 0xd7 },
+        { 0xd9, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
+        { 0xda, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
+        { 0xdb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
+    };
+
+    if (px->len == 32) {
+        p = px->data;
+    } else {
+        return SECFailure;
+    }
+
+    for (i = 0; i < PR_ARRAY_SIZE(forbiddenValues); ++i) {
+        if (NSS_SecureMemcmp(p, forbiddenValues[i], px->len) == 0) {
+            return SECFailure;
+        }
+    }
+
+    return SECSuccess;
+}
+
+/*
+ * Scalar multiplication for Curve25519.
+ * If P == NULL, the base point is used.
+ * Returns X = k*P
+ */
+SECStatus
+ec_Curve25519_pt_mul(SECItem *X, SECItem *k, SECItem *P)
+{
+    PRUint8 *px;
+    PRUint8 basePoint[32] = { 9 };
+
+    if (!P) {
+        px = basePoint;
+    } else {
+        PORT_Assert(P->len == 32);
+        if (P->len != 32) {
+            return SECFailure;
+        }
+        px = P->data;
+    }
+    if (k->len != 32) {
+        return SECFailure;
+    }
+
+    SECStatus rv = ec_Curve25519_mul(X->data, k->data, px);
+    if (NSS_SecureMemcmpZero(X->data, X->len) == 0) {
+        return SECFailure;
+    }
+    return rv;
+}