1 files changed, 65 insertions, 0 deletions

diff --git a/src/lib/libcrypto/ec/ec_internal.h b/src/lib/libcrypto/ec/ec_internal.h
new file mode 100644
index 0000000000..327d9ea94d
--- /dev/null
+++ b/src/lib/libcrypto/ec/ec_internal.h
@@ -0,0 +1,65 @@
+/*      $OpenBSD: ec_internal.h,v 1.2 2025/08/02 15:44:09 jsing Exp $   */
+/*
+ * Copyright (c) 2024 Joel Sing <jsing@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <openssl/bn.h>
+
+#ifndef HEADER_EC_INTERNAL_H
+#define HEADER_EC_INTERNAL_H
+
+#define EC_FIELD_ELEMENT_MAX_BITS 521
+#define EC_FIELD_ELEMENT_MAX_BYTES \
+    (EC_FIELD_ELEMENT_MAX_BITS + 7) / 8
+#define EC_FIELD_ELEMENT_MAX_WORDS \
+    ((EC_FIELD_ELEMENT_MAX_BYTES + BN_BYTES - 1) / BN_BYTES)
+
+typedef struct {
+        BN_ULONG w[EC_FIELD_ELEMENT_MAX_WORDS];
+} EC_FIELD_ELEMENT;
+
+typedef struct {
+        size_t n;
+        EC_FIELD_ELEMENT m;
+        EC_FIELD_ELEMENT rr;
+        BN_ULONG minv0;
+} EC_FIELD_MODULUS;
+
+int ec_field_modulus_from_bn(EC_FIELD_MODULUS *fm, const BIGNUM *bn,
+    BN_CTX *ctx);
+
+int ec_field_element_from_bn(const EC_FIELD_MODULUS *fm, const EC_GROUP *group,
+    EC_FIELD_ELEMENT *fe, const BIGNUM *bn, BN_CTX *ctx);
+int ec_field_element_to_bn(const EC_FIELD_MODULUS *fm, const EC_FIELD_ELEMENT *fe,
+    BIGNUM *bn, BN_CTX *ctx);
+
+void ec_field_element_copy(EC_FIELD_ELEMENT *dst, const EC_FIELD_ELEMENT *src);
+void ec_field_element_select(const EC_FIELD_MODULUS *fm, EC_FIELD_ELEMENT *r,
+    const EC_FIELD_ELEMENT *a, const EC_FIELD_ELEMENT *b, int conditional);
+
+int ec_field_element_equal(const EC_FIELD_MODULUS *fm, const EC_FIELD_ELEMENT *a,
+    const EC_FIELD_ELEMENT *b);
+int ec_field_element_is_zero(const EC_FIELD_MODULUS *fm, const EC_FIELD_ELEMENT *fe);
+
+void ec_field_element_add(const EC_FIELD_MODULUS *m, EC_FIELD_ELEMENT *r,
+    const EC_FIELD_ELEMENT *a, const EC_FIELD_ELEMENT *b);
+void ec_field_element_sub(const EC_FIELD_MODULUS *m, EC_FIELD_ELEMENT *r,
+    const EC_FIELD_ELEMENT *a, const EC_FIELD_ELEMENT *b);
+void ec_field_element_mul(const EC_FIELD_MODULUS *m, EC_FIELD_ELEMENT *r,
+    const EC_FIELD_ELEMENT *a, const EC_FIELD_ELEMENT *b);
+void ec_field_element_sqr(const EC_FIELD_MODULUS *m, EC_FIELD_ELEMENT *r,
+    const EC_FIELD_ELEMENT *a);
+
+#endif