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include/ssl/ssl_bigint_impl.h

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+/*
+ * 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 */
+#ifdef WIN32
+#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 sint64_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