1 files changed, 53 insertions, 0 deletions
diff --git a/include/crypto/ec.h b/include/crypto/ec.h
new file mode 100644
index 000000000000..fe52ae704bb9
--- /dev/null
+++ b/include/crypto/ec.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/* Internal EC functions for other submodules: not for application use */
+
+#ifndef OSSL_CRYPTO_EC_H
+# define OSSL_CRYPTO_EC_H
+# include <openssl/opensslconf.h>
+
+# ifndef OPENSSL_NO_EC
+
+#  include <openssl/ec.h>
+
+/*-
+ * Computes the multiplicative inverse of x in the range
+ * [1,EC_GROUP::order), where EC_GROUP::order is the cardinality of the
+ * subgroup generated by the generator G:
+ *
+ *         res := x^(-1) (mod EC_GROUP::order).
+ *
+ * This function expects the following two conditions to hold:
+ *  - the EC_GROUP order is prime, and
+ *  - x is included in the range [1, EC_GROUP::order).
+ *
+ * This function returns 1 on success, 0 on error.
+ *
+ * If the EC_GROUP order is even, this function explicitly returns 0 as
+ * an error.
+ * In case any of the two conditions stated above is not satisfied,
+ * the correctness of its output is not guaranteed, even if the return
+ * value could still be 1 (as primality testing and a conditional modular
+ * reduction round on the input can be omitted by the underlying
+ * implementations for better SCA properties on regular input values).
+ */
+__owur int ec_group_do_inverse_ord(const EC_GROUP *group, BIGNUM *res,
+                                   const BIGNUM *x, BN_CTX *ctx);
+
+/*-
+ * ECDH Key Derivation Function as defined in ANSI X9.63
+ */
+int ecdh_KDF_X9_63(unsigned char *out, size_t outlen,
+                   const unsigned char *Z, size_t Zlen,
+                   const unsigned char *sinfo, size_t sinfolen,
+                   const EVP_MD *md);
+
+# endif /* OPENSSL_NO_EC */
+#endif