Diff: wolfssl/wolfcrypt/ge_operations.h

Revision:

15:117db924cf7c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wolfssl/wolfcrypt/ge_operations.h	Sat Aug 18 22:20:43 2018 +0000
@@ -0,0 +1,112 @@
+/* ge_operations.h
+ *
+ * Copyright (C) 2006-2017 wolfSSL Inc.
+ *
+ * This file is part of wolfSSL.
+ *
+ * wolfSSL is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * wolfSSL is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
+ */
+
+
+ /* Based On Daniel J Bernstein's ed25519 Public Domain ref10 work. */
+
+#ifndef WOLF_CRYPT_GE_OPERATIONS_H
+#define WOLF_CRYPT_GE_OPERATIONS_H
+
+#include <wolfssl/wolfcrypt/settings.h>
+
+#ifdef HAVE_ED25519
+
+#include <wolfssl/wolfcrypt/fe_operations.h>
+
+/*
+ge means group element.
+
+Here the group is the set of pairs (x,y) of field elements (see fe.h)
+satisfying -x^2 + y^2 = 1 + d x^2y^2
+where d = -121665/121666.
+
+Representations:
+  ge_p2 (projective): (X:Y:Z) satisfying x=X/Z, y=Y/Z
+  ge_p3 (extended): (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT
+  ge_p1p1 (completed): ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T
+  ge_precomp (Duif): (y+x,y-x,2dxy)
+*/
+
+#ifdef ED25519_SMALL
+  typedef byte     ge[F25519_SIZE];
+#elif defined(CURVED25519_X64)
+  typedef int64_t  ge[4];
+#elif defined(CURVED25519_128BIT)
+  typedef int64_t  ge[5];
+#else
+  typedef int32_t  ge[10];
+#endif
+
+typedef struct {
+  ge X;
+  ge Y;
+  ge Z;
+} ge_p2;
+
+typedef struct {
+  ge X;
+  ge Y;
+  ge Z;
+  ge T;
+} ge_p3;
+
+
+WOLFSSL_LOCAL int  ge_compress_key(byte* out, const byte* xIn, const byte* yIn,
+                                                                word32 keySz);
+WOLFSSL_LOCAL int  ge_frombytes_negate_vartime(ge_p3 *,const unsigned char *);
+
+WOLFSSL_LOCAL int  ge_double_scalarmult_vartime(ge_p2 *,const unsigned char *,
+                                         const ge_p3 *,const unsigned char *);
+WOLFSSL_LOCAL void ge_scalarmult_base(ge_p3 *,const unsigned char *);
+WOLFSSL_LOCAL void sc_reduce(byte* s);
+WOLFSSL_LOCAL void sc_muladd(byte* s, const byte* a, const byte* b,
+                             const byte* c);
+WOLFSSL_LOCAL void ge_tobytes(unsigned char *,const ge_p2 *);
+WOLFSSL_LOCAL void ge_p3_tobytes(unsigned char *,const ge_p3 *);
+
+
+#ifndef ED25519_SMALL
+typedef struct {
+  ge X;
+  ge Y;
+  ge Z;
+  ge T;
+} ge_p1p1;
+
+typedef struct {
+  ge yplusx;
+  ge yminusx;
+  ge xy2d;
+} ge_precomp;
+
+typedef struct {
+  ge YplusX;
+  ge YminusX;
+  ge Z;
+  ge T2d;
+} ge_cached;
+
+#endif /* !ED25519_SMALL */
+
+#endif /* HAVE_ED25519 */
+
+#endif /* WOLF_CRYPT_GE_OPERATIONS_H */
+