lib/mpi: Introduce ec implementation to MPI library (d58bb7e5) · Commits · 戴 / test

include/linux/mpi.h

+105 −0

Original line number	Diff line number	Diff line
		@@ -157,6 +157,111 @@ void mpi_fdiv_q(MPI quot, MPI dividend, MPI divisor);
		/-- mpi-inv.c --/
		int mpi_invm(MPI x, MPI a, MPI n);

		/-- ec.c --/

		/* Object to represent a point in projective coordinates */
		struct gcry_mpi_point {
		MPI x;
		MPI y;
		MPI z;
		};

		typedef struct gcry_mpi_point *MPI_POINT;

		/* Models describing an elliptic curve */
		enum gcry_mpi_ec_models {
		/* The Short Weierstrass equation is
		* y^2 = x^3 + ax + b
		*/
		MPI_EC_WEIERSTRASS = 0,
		/* The Montgomery equation is
		* by^2 = x^3 + ax^2 + x
		*/
		MPI_EC_MONTGOMERY,
		/* The Twisted Edwards equation is
		* ax^2 + y^2 = 1 + bx^2y^2
		* Note that we use 'b' instead of the commonly used 'd'.
		*/
		MPI_EC_EDWARDS
		};

		/* Dialects used with elliptic curves */
		enum ecc_dialects {
		ECC_DIALECT_STANDARD = 0,
		ECC_DIALECT_ED25519,
		ECC_DIALECT_SAFECURVE
		};

		/* This context is used with all our EC functions. */
		struct mpi_ec_ctx {
		enum gcry_mpi_ec_models model; /* The model describing this curve. */
		enum ecc_dialects dialect; /* The ECC dialect used with the curve. */
		int flags; /* Public key flags (not always used). */
		unsigned int nbits; /* Number of bits. */

		/* Domain parameters. Note that they may not all be set and if set
		* the MPIs may be flaged as constant.
		*/
		MPI p; /* Prime specifying the field GF(p). */
		MPI a; /* First coefficient of the Weierstrass equation. */
		MPI b; /* Second coefficient of the Weierstrass equation. */
		MPI_POINT G; /* Base point (generator). */
		MPI n; /* Order of G. */
		unsigned int h; /* Cofactor. */

		/* The actual key. May not be set. */
		MPI_POINT Q; /* Public key. */
		MPI d; /* Private key. */

		const char name; / Name of the curve. */

		/* This structure is private to mpi/ec.c! */
		struct {
		struct {
		unsigned int a_is_pminus3:1;
		unsigned int two_inv_p:1;
		} valid; /* Flags to help setting the helper vars below. */

		int a_is_pminus3; /* True if A = P - 3. */

		MPI two_inv_p;

		mpi_barrett_t p_barrett;

		/* Scratch variables. */
		MPI scratch[11];

		/* Helper for fast reduction. */
		/* int nist_nbits; /\* If this is a NIST curve, the # of bits. \/ /
		/* MPI s[10]; */
		/* MPI c; */
		} t;

		/* Curve specific computation routines for the field. */
		void (addm)(MPI w, MPI u, MPI v, struct mpi_ec_ctx ctx);
		void (subm)(MPI w, MPI u, MPI v, struct mpi_ec_ctx ec);
		void (mulm)(MPI w, MPI u, MPI v, struct mpi_ec_ctx ctx);
		void (pow2)(MPI w, const MPI b, struct mpi_ec_ctx ctx);
		void (mul2)(MPI w, MPI u, struct mpi_ec_ctx ctx);
		};

		void mpi_ec_init(struct mpi_ec_ctx *ctx, enum gcry_mpi_ec_models model,
		enum ecc_dialects dialect,
		int flags, MPI p, MPI a, MPI b);
		void mpi_ec_deinit(struct mpi_ec_ctx *ctx);
		MPI_POINT mpi_point_new(unsigned int nbits);
		void mpi_point_release(MPI_POINT p);
		void mpi_point_init(MPI_POINT p);
		void mpi_point_free_parts(MPI_POINT p);
		int mpi_ec_get_affine(MPI x, MPI y, MPI_POINT point, struct mpi_ec_ctx *ctx);
		void mpi_ec_add_points(MPI_POINT result,
		MPI_POINT p1, MPI_POINT p2,
		struct mpi_ec_ctx *ctx);
		void mpi_ec_mul_point(MPI_POINT result,
		MPI scalar, MPI_POINT point,
		struct mpi_ec_ctx *ctx);
		int mpi_ec_curve_point(MPI_POINT point, struct mpi_ec_ctx *ctx);

		/* inline functions */

		/**

lib/mpi/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@ mpi-y = \
		generic_mpih-rshift.o \
		generic_mpih-sub1.o \
		generic_mpih-add1.o \
		ec.o \
		mpicoder.o \
		mpi-add.o \
		mpi-bit.o \

lib/mpi/ec.c

0 → 100644

+1509 −0

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