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Diffstat (limited to 'ccast/axTLS/bigint_impl.h')
| -rw-r--r-- | ccast/axTLS/bigint_impl.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/ccast/axTLS/bigint_impl.h b/ccast/axTLS/bigint_impl.h new file mode 100644 index 0000000..820620d --- /dev/null +++ b/ccast/axTLS/bigint_impl.h @@ -0,0 +1,131 @@ +/* + * Copyright (c) 2007, Cameron Rich + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * * Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * * Neither the name of the axTLS project nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef BIGINT_IMPL_HEADER +#define BIGINT_IMPL_HEADER + +/* Maintain a number of precomputed variables when doing reduction */ +#define BIGINT_M_OFFSET 0 /**< Normal modulo offset. */ +#ifdef CONFIG_BIGINT_CRT +#define BIGINT_P_OFFSET 1 /**< p modulo offset. */ +#define BIGINT_Q_OFFSET 2 /**< q module offset. */ +#define BIGINT_NUM_MODS 3 /**< The number of modulus constants used. */ +#else +#define BIGINT_NUM_MODS 1 +#endif + +/* Architecture specific functions for big ints */ +#if defined(CONFIG_INTEGER_8BIT) +#define COMP_RADIX 256U /**< Max component + 1 */ +#define COMP_MAX 0xFFFFU/**< (Max dbl comp -1) */ +#define COMP_BIT_SIZE 8 /**< Number of bits in a component. */ +#define COMP_BYTE_SIZE 1 /**< Number of bytes in a component. */ +#define COMP_NUM_NIBBLES 2 /**< Used For diagnostics only. */ +typedef uint8_t comp; /**< A single precision component. */ +typedef uint16_t long_comp; /**< A double precision component. */ +typedef int16_t slong_comp; /**< A signed double precision component. */ +#elif defined(CONFIG_INTEGER_16BIT) +#define COMP_RADIX 65536U /**< Max component + 1 */ +#define COMP_MAX 0xFFFFFFFFU/**< (Max dbl comp -1) */ +#define COMP_BIT_SIZE 16 /**< Number of bits in a component. */ +#define COMP_BYTE_SIZE 2 /**< Number of bytes in a component. */ +#define COMP_NUM_NIBBLES 4 /**< Used For diagnostics only. */ +typedef uint16_t comp; /**< A single precision component. */ +typedef uint32_t long_comp; /**< A double precision component. */ +typedef int32_t slong_comp; /**< A signed double precision component. */ +#else /* regular 32 bit */ +#if defined(WIN32) && !defined(__GNUC__) +#define COMP_RADIX 4294967296i64 +#define COMP_MAX 0xFFFFFFFFFFFFFFFFui64 +#else +#define COMP_RADIX 4294967296ULL /**< Max component + 1 */ +#define COMP_MAX 0xFFFFFFFFFFFFFFFFULL/**< (Max dbl comp -1) */ +#endif +#define COMP_BIT_SIZE 32 /**< Number of bits in a component. */ +#define COMP_BYTE_SIZE 4 /**< Number of bytes in a component. */ +#define COMP_NUM_NIBBLES 8 /**< Used For diagnostics only. */ +typedef uint32_t comp; /**< A single precision component. */ +typedef uint64_t long_comp; /**< A double precision component. */ +typedef int64_t slong_comp; /**< A signed double precision component. */ +#endif + +/** + * @struct _bigint + * @brief A big integer basic object + */ +struct _bigint +{ + struct _bigint* next; /**< The next bigint in the cache. */ + short size; /**< The number of components in this bigint. */ + short max_comps; /**< The heapsize allocated for this bigint */ + int refs; /**< An internal reference count. */ + comp* comps; /**< A ptr to the actual component data */ +}; + +typedef struct _bigint bigint; /**< An alias for _bigint */ + +/** + * Maintains the state of the cache, and a number of variables used in + * reduction. + */ +typedef struct /**< A big integer "session" context. */ +{ + bigint *active_list; /**< Bigints currently used. */ + bigint *free_list; /**< Bigints not used. */ + bigint *bi_radix; /**< The radix used. */ + bigint *bi_mod[BIGINT_NUM_MODS]; /**< modulus */ + +#if defined(CONFIG_BIGINT_MONTGOMERY) + bigint *bi_RR_mod_m[BIGINT_NUM_MODS]; /**< R^2 mod m */ + bigint *bi_R_mod_m[BIGINT_NUM_MODS]; /**< R mod m */ + comp N0_dash[BIGINT_NUM_MODS]; +#elif defined(CONFIG_BIGINT_BARRETT) + bigint *bi_mu[BIGINT_NUM_MODS]; /**< Storage for mu */ +#endif + bigint *bi_normalised_mod[BIGINT_NUM_MODS]; /**< Normalised mod storage. */ + bigint **g; /**< Used by sliding-window. */ + int window; /**< The size of the sliding window */ + int active_count; /**< Number of active bigints. */ + int free_count; /**< Number of free bigints. */ + +#ifdef CONFIG_BIGINT_MONTGOMERY + uint8_t use_classical; /**< Use classical reduction. */ +#endif + uint8_t mod_offset; /**< The mod offset we are using */ +} BI_CTX; + +#ifndef WIN32 +#define max(a,b) ((a)>(b)?(a):(b)) /**< Find the maximum of 2 numbers. */ +#define min(a,b) ((a)<(b)?(a):(b)) /**< Find the minimum of 2 numbers. */ +#endif + +#define PERMANENT 0x7FFF55AA /**< A magic number for permanents. */ + +#endif |