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73dfbb7568
git-svn-id: svn://svn.code.sf.net/p/axtls/code/trunk@78 9a5d90b5-6617-0410-8a86-bb477d3ed2e3
106 lines
4.3 KiB
C
106 lines
4.3 KiB
C
/*
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* Copyright(C) 2006 Cameron Rich
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef BIGINT_IMPL_HEADER
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#define BIGINT_IMPL_HEADER
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/* Maintain a number of precomputed variables when doing reduction */
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#define BIGINT_M_OFFSET 0 /**< Normal modulo offset. */
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#ifdef CONFIG_BIGINT_CRT
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#define BIGINT_P_OFFSET 1 /**< p modulo offset. */
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#define BIGINT_Q_OFFSET 2 /**< q module offset. */
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#define BIGINT_NUM_MODS 3 /**< The number of modulus constants used. */
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#else
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#define BIGINT_NUM_MODS 1
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#endif
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/* Architecture specific functions for big ints */
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#ifdef WIN32
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#define COMP_RADIX 4294967296i64
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#define COMP_BIG_MSB 0x8000000000000000i64
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#else
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#define COMP_RADIX 4294967296ULL /**< Max component + 1 */
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#define COMP_BIG_MSB 0x8000000000000000ULL /**< (Max dbl comp + 1)/ 2 */
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#endif
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#define COMP_BIT_SIZE 32 /**< Number of bits in a component. */
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#define COMP_BYTE_SIZE 4 /**< Number of bytes in a component. */
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#define COMP_NUM_NIBBLES 8 /**< Used For diagnostics only. */
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typedef uint32_t comp; /**< A single precision component. */
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typedef uint64_t long_comp; /**< A double precision component. */
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typedef int64_t slong_comp; /**< A signed double precision component. */
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/**
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* @struct _bigint
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* @brief A big integer basic object
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*/
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struct _bigint
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{
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struct _bigint* next; /**< The next bigint in the cache. */
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short size; /**< The number of components in this bigint. */
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short max_comps; /**< The heapsize allocated for this bigint */
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int refs; /**< An internal reference count. */
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comp* comps; /**< A ptr to the actual component data */
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};
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typedef struct _bigint bigint; /**< An alias for _bigint */
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/**
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* Maintains the state of the cache, and a number of variables used in
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* reduction.
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*/
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typedef struct /**< A big integer "session" context. */
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{
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bigint *active_list; /**< Bigints currently used. */
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bigint *free_list; /**< Bigints not used. */
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bigint *bi_radix; /**< The radix used. */
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bigint *bi_mod[BIGINT_NUM_MODS]; /**< modulus */
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#if defined(CONFIG_BIGINT_MONTGOMERY)
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bigint *bi_RR_mod_m[BIGINT_NUM_MODS]; /**< R^2 mod m */
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bigint *bi_R_mod_m[BIGINT_NUM_MODS]; /**< R mod m */
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comp N0_dash[BIGINT_NUM_MODS];
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#elif defined(CONFIG_BIGINT_BARRETT)
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bigint *bi_mu[BIGINT_NUM_MODS]; /**< Storage for mu */
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#endif
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bigint *bi_normalised_mod[BIGINT_NUM_MODS]; /**< Normalised mod storage. */
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bigint **g; /**< Used by sliding-window. */
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int window; /**< The size of the sliding window */
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int active_count; /**< Number of active bigints. */
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int free_count; /**< Number of free bigints. */
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#ifdef CONFIG_BIGINT_MONTGOMERY
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uint8_t use_classical; /**< Use classical reduction. */
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#endif
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uint8_t mod_offset; /**< The mod offset we are using */
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} BI_CTX;
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#ifndef WIN32
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#define max(a,b) ((a)>(b)?(a):(b)) /**< Find the maximum of 2 numbers. */
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#define min(a,b) ((a)<(b)?(a):(b)) /**< Find the minimum of 2 numbers. */
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#endif
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#define PERMANENT 0x7FFF55AA /**< A magic number for permanents. */
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#define V1 v->comps[v->size-1] /**< v1 for division */
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#define V2 v->comps[v->size-2] /**< v2 for division */
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#define U(j) tmp_u->comps[tmp_u->size-j-1] /**< uj for division */
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#define Q(j) quotient->comps[quotient->size-j-1] /**< qj for division */
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#endif
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