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2024-05-14 bedbef8ad3e75a304af6361af235302bcc61d06b 
 kernel/include/linux/mpi.h
....@@ -1,22 +1,9 @@
1
+/* SPDX-License-Identifier: GPL-2.0-or-later */
12 /* mpi.h  -  Multi Precision Integers
23  *	Copyright (C) 1994, 1996, 1998, 1999,
34  *                    2000, 2001 Free Software Foundation, Inc.
45  *
56  * This file is part of GNUPG.
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- *
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- * GNUPG is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * GNUPG is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
207  *
218  * Note: This code is heavily based on the GNU MP Library.
229  *	 Actually it's the same code with only minor changes in the
....@@ -53,21 +40,79 @@
5340 typedef struct gcry_mpi *MPI;
5441 
5542 #define mpi_get_nlimbs(a)     ((a)->nlimbs)
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+#define mpi_has_sign(a)       ((a)->sign)
5644 
5745 /*-- mpiutil.c --*/
5846 MPI mpi_alloc(unsigned nlimbs);
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+void mpi_clear(MPI a);
5948 void mpi_free(MPI a);
6049 int mpi_resize(MPI a, unsigned nlimbs);
6150 
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+static inline MPI mpi_new(unsigned int nbits)
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+{
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+	return mpi_alloc((nbits + BITS_PER_MPI_LIMB - 1) / BITS_PER_MPI_LIMB);
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+}
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+
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+MPI mpi_copy(MPI a);
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+MPI mpi_alloc_like(MPI a);
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+void mpi_snatch(MPI w, MPI u);
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+MPI mpi_set(MPI w, MPI u);
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+MPI mpi_set_ui(MPI w, unsigned long u);
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+MPI mpi_alloc_set_ui(unsigned long u);
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+void mpi_swap_cond(MPI a, MPI b, unsigned long swap);
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+
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+/* Constants used to return constant MPIs.  See mpi_init if you
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+ * want to add more constants.
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+ */
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+#define MPI_NUMBER_OF_CONSTANTS 6
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+enum gcry_mpi_constants {
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+	MPI_C_ZERO,
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+	MPI_C_ONE,
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+	MPI_C_TWO,
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+	MPI_C_THREE,
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+	MPI_C_FOUR,
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+	MPI_C_EIGHT
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+};
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+
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+MPI mpi_const(enum gcry_mpi_constants no);
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+
6279 /*-- mpicoder.c --*/
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+
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+/* Different formats of external big integer representation. */
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+enum gcry_mpi_format {
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+	GCRYMPI_FMT_NONE = 0,
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+	GCRYMPI_FMT_STD = 1,    /* Twos complement stored without length. */
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+	GCRYMPI_FMT_PGP = 2,    /* As used by OpenPGP (unsigned only). */
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+	GCRYMPI_FMT_SSH = 3,    /* As used by SSH (like STD but with length). */
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+	GCRYMPI_FMT_HEX = 4,    /* Hex format. */
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+	GCRYMPI_FMT_USG = 5,    /* Like STD but unsigned. */
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+	GCRYMPI_FMT_OPAQUE = 8  /* Opaque format (some functions only). */
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+};
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+
6392 MPI mpi_read_raw_data(const void *xbuffer, size_t nbytes);
6493 MPI mpi_read_from_buffer(const void *buffer, unsigned *ret_nread);
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+int mpi_fromstr(MPI val, const char *str);
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+MPI mpi_scanval(const char *string);
6596 MPI mpi_read_raw_from_sgl(struct scatterlist *sgl, unsigned int len);
6697 void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign);
6798 int mpi_read_buffer(MPI a, uint8_t *buf, unsigned buf_len, unsigned *nbytes,
6899 		    int *sign);
69100 int mpi_write_to_sgl(MPI a, struct scatterlist *sg, unsigned nbytes,
70101 		     int *sign);
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+int mpi_print(enum gcry_mpi_format format, unsigned char *buffer,
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+			size_t buflen, size_t *nwritten, MPI a);
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+
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+/*-- mpi-mod.c --*/
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+void mpi_mod(MPI rem, MPI dividend, MPI divisor);
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+
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+/* Context used with Barrett reduction.  */
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+struct barrett_ctx_s;
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+typedef struct barrett_ctx_s *mpi_barrett_t;
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+
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+mpi_barrett_t mpi_barrett_init(MPI m, int copy);
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+void mpi_barrett_free(mpi_barrett_t ctx);
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+void mpi_mod_barrett(MPI r, MPI x, mpi_barrett_t ctx);
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+void mpi_mul_barrett(MPI w, MPI u, MPI v, mpi_barrett_t ctx);
71116 
72117 /*-- mpi-pow.c --*/
73118 int mpi_powm(MPI res, MPI base, MPI exp, MPI mod);
....@@ -75,10 +120,147 @@
75120 /*-- mpi-cmp.c --*/
76121 int mpi_cmp_ui(MPI u, ulong v);
77122 int mpi_cmp(MPI u, MPI v);
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+int mpi_cmpabs(MPI u, MPI v);
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+
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+/*-- mpi-sub-ui.c --*/
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+int mpi_sub_ui(MPI w, MPI u, unsigned long vval);
78127 
79128 /*-- mpi-bit.c --*/
80129 void mpi_normalize(MPI a);
81130 unsigned mpi_get_nbits(MPI a);
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+int mpi_test_bit(MPI a, unsigned int n);
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+void mpi_set_bit(MPI a, unsigned int n);
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+void mpi_set_highbit(MPI a, unsigned int n);
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+void mpi_clear_highbit(MPI a, unsigned int n);
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+void mpi_clear_bit(MPI a, unsigned int n);
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+void mpi_rshift_limbs(MPI a, unsigned int count);
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+void mpi_rshift(MPI x, MPI a, unsigned int n);
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+void mpi_lshift_limbs(MPI a, unsigned int count);
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+void mpi_lshift(MPI x, MPI a, unsigned int n);
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+
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+/*-- mpi-add.c --*/
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+void mpi_add_ui(MPI w, MPI u, unsigned long v);
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+void mpi_add(MPI w, MPI u, MPI v);
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+void mpi_sub(MPI w, MPI u, MPI v);
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+void mpi_addm(MPI w, MPI u, MPI v, MPI m);
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+void mpi_subm(MPI w, MPI u, MPI v, MPI m);
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+
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+/*-- mpi-mul.c --*/
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+void mpi_mul(MPI w, MPI u, MPI v);
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+void mpi_mulm(MPI w, MPI u, MPI v, MPI m);
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+
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+/*-- mpi-div.c --*/
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+void mpi_tdiv_r(MPI rem, MPI num, MPI den);
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+void mpi_fdiv_r(MPI rem, MPI dividend, MPI divisor);
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+void mpi_fdiv_q(MPI quot, MPI dividend, MPI divisor);
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+
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+/*-- mpi-inv.c --*/
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+int mpi_invm(MPI x, MPI a, MPI n);
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+
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+/*-- ec.c --*/
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+
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+/* Object to represent a point in projective coordinates */
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+struct gcry_mpi_point {
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+	MPI x;
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+	MPI y;
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+	MPI z;
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+};
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+
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+typedef struct gcry_mpi_point *MPI_POINT;
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+
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+/* Models describing an elliptic curve */
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+enum gcry_mpi_ec_models {
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+	/* The Short Weierstrass equation is
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+	 *      y^2 = x^3 + ax + b
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+	 */
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+	MPI_EC_WEIERSTRASS = 0,
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+	/* The Montgomery equation is
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+	 *      by^2 = x^3 + ax^2 + x
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+	 */
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+	MPI_EC_MONTGOMERY,
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+	/* The Twisted Edwards equation is
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+	 *      ax^2 + y^2 = 1 + bx^2y^2
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+	 * Note that we use 'b' instead of the commonly used 'd'.
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+	 */
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+	MPI_EC_EDWARDS
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+};
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+
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+/* Dialects used with elliptic curves */
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+enum ecc_dialects {
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+	ECC_DIALECT_STANDARD = 0,
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+	ECC_DIALECT_ED25519,
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+	ECC_DIALECT_SAFECURVE
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+};
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+
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+/* This context is used with all our EC functions. */
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+struct mpi_ec_ctx {
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+	enum gcry_mpi_ec_models model; /* The model describing this curve. */
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+	enum ecc_dialects dialect;     /* The ECC dialect used with the curve. */
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+	int flags;                     /* Public key flags (not always used). */
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+	unsigned int nbits;            /* Number of bits.  */
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+
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+	/* Domain parameters.  Note that they may not all be set and if set
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+	 * the MPIs may be flaged as constant.
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+	 */
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+	MPI p;         /* Prime specifying the field GF(p).  */
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+	MPI a;         /* First coefficient of the Weierstrass equation.  */
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+	MPI b;         /* Second coefficient of the Weierstrass equation.  */
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+	MPI_POINT G;   /* Base point (generator).  */
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+	MPI n;         /* Order of G.  */
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+	unsigned int h;       /* Cofactor.  */
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+
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+	/* The actual key.  May not be set.  */
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+	MPI_POINT Q;   /* Public key.   */
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+	MPI d;         /* Private key.  */
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+
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+	const char *name;      /* Name of the curve.  */
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+
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+	/* This structure is private to mpi/ec.c! */
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+	struct {
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+		struct {
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+			unsigned int a_is_pminus3:1;
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+			unsigned int two_inv_p:1;
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+		} valid; /* Flags to help setting the helper vars below.  */
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+
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+		int a_is_pminus3;  /* True if A = P - 3. */
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+
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+		MPI two_inv_p;
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+
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+		mpi_barrett_t p_barrett;
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+
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+		/* Scratch variables.  */
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+		MPI scratch[11];
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+
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+		/* Helper for fast reduction.  */
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+		/*   int nist_nbits; /\* If this is a NIST curve, the # of bits. *\/ */
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+		/*   MPI s[10]; */
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+		/*   MPI c; */
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+	} t;
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+
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+	/* Curve specific computation routines for the field.  */
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+	void (*addm)(MPI w, MPI u, MPI v, struct mpi_ec_ctx *ctx);
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+	void (*subm)(MPI w, MPI u, MPI v, struct mpi_ec_ctx *ec);
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+	void (*mulm)(MPI w, MPI u, MPI v, struct mpi_ec_ctx *ctx);
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+	void (*pow2)(MPI w, const MPI b, struct mpi_ec_ctx *ctx);
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+	void (*mul2)(MPI w, MPI u, struct mpi_ec_ctx *ctx);
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+};
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+
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+void mpi_ec_init(struct mpi_ec_ctx *ctx, enum gcry_mpi_ec_models model,
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+			enum ecc_dialects dialect,
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+			int flags, MPI p, MPI a, MPI b);
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+void mpi_ec_deinit(struct mpi_ec_ctx *ctx);
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+MPI_POINT mpi_point_new(unsigned int nbits);
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+void mpi_point_release(MPI_POINT p);
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+void mpi_point_init(MPI_POINT p);
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+void mpi_point_free_parts(MPI_POINT p);
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+int mpi_ec_get_affine(MPI x, MPI y, MPI_POINT point, struct mpi_ec_ctx *ctx);
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+void mpi_ec_add_points(MPI_POINT result,
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+			MPI_POINT p1, MPI_POINT p2,
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+			struct mpi_ec_ctx *ctx);
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+void mpi_ec_mul_point(MPI_POINT result,
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+			MPI scalar, MPI_POINT point,
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+			struct mpi_ec_ctx *ctx);
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+int mpi_ec_curve_point(MPI_POINT point, struct mpi_ec_ctx *ctx);
82264 
83265 /* inline functions */
84266