bigint.h

00001 /*
00002  * Copyright (c) 2007, Cameron Rich
00003  * 
00004  * All rights reserved.
00005  * 
00006  * Redistribution and use in source and binary forms, with or without 
00007  * modification, are permitted provided that the following conditions are met:
00008  *
00009  * * Redistributions of source code must retain the above copyright notice, 
00010  *   this list of conditions and the following disclaimer.
00011  * * Redistributions in binary form must reproduce the above copyright notice, 
00012  *   this list of conditions and the following disclaimer in the documentation 
00013  *   and/or other materials provided with the distribution.
00014  * * Neither the name of the axTLS project nor the names of its contributors 
00015  *   may be used to endorse or promote products derived from this software 
00016  *   without specific prior written permission.
00017  *
00018  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00019  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00020  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
00021  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
00022  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00023  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00024  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00025  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00026  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00027  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00028  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00029  */
00030 
00031 #ifndef BIGINT_HEADER
00032 #define BIGINT_HEADER
00033 
00034 #include "crypto.h "
00035 
00036 BI_CTX *bi_initialize(void);
00037 void bi_terminate(BI_CTX *ctx);
00038 void bi_permanent(bigint *bi);
00039 void bi_depermanent(bigint *bi);
00040 void bi_clear_cache(BI_CTX *ctx);
00041 void bi_free(BI_CTX *ctx, bigint *bi);
00042 bigint *bi_copy(bigint *bi);
00043 bigint *bi_clone(BI_CTX *ctx, const bigint *bi);
00044 void bi_export(BI_CTX *ctx, bigint *bi, uint8_t *data, int size);
00045 bigint *bi_import(BI_CTX *ctx, const uint8_t *data, int len);
00046 bigint *int_to_bi(BI_CTX *ctx, comp i);
00047 
00048 /* the functions that actually do something interesting */
00049 bigint *bi_add(BI_CTX *ctx, bigint *bia, bigint *bib);
00050 bigint *bi_subtract(BI_CTX *ctx, bigint *bia, 
00051         bigint *bib, int *is_negative);
00052 bigint *bi_divide(BI_CTX *ctx, bigint *bia, bigint *bim, int is_mod);
00053 bigint *bi_multiply(BI_CTX *ctx, bigint *bia, bigint *bib);
00054 bigint *bi_mod_power(BI_CTX *ctx, bigint *bi, bigint *biexp);
00055 bigint *bi_mod_power2(BI_CTX *ctx, bigint *bi, bigint *bim, bigint *biexp);
00056 int bi_compare(bigint *bia, bigint *bib);
00057 void bi_set_mod(BI_CTX *ctx, bigint *bim, int mod_offset);
00058 void bi_free_mod(BI_CTX *ctx, int mod_offset);
00059 
00060 #ifdef CONFIG_SSL_FULL_MODE
00061 void bi_print(const char *label, bigint *bi);
00062 bigint *bi_str_import(BI_CTX *ctx, const char *data);
00063 #endif
00064 
00065 /**
00066  * @def bi_mod
00067  * Find the residue of B. bi_set_mod() must be called before hand.
00068  */
00069 #define bi_mod(A, B)      bi_divide(A, B, ctx->bi_mod[ctx->mod_offset], 1)
00070 
00071 /**
00072  * bi_residue() is technically the same as bi_mod(), but it uses the
00073  * appropriate reduction technique (which is bi_mod() when doing classical
00074  * reduction).
00075  */
00076 #if defined(CONFIG_BIGINT_MONTGOMERY)
00077 #define bi_residue(A, B)         bi_mont(A, B)
00078 bigint *bi_mont(BI_CTX *ctx, bigint *bixy);
00079 #elif defined(CONFIG_BIGINT_BARRETT)
00080 #define bi_residue(A, B)         bi_barrett(A, B)
00081 bigint *bi_barrett(BI_CTX *ctx, bigint *bi);
00082 #else /* if defined(CONFIG_BIGINT_CLASSICAL) */
00083 #define bi_residue(A, B)         bi_mod(A, B)
00084 #endif
00085 
00086 #ifdef CONFIG_BIGINT_SQUARE
00087 bigint *bi_square(BI_CTX *ctx, bigint *bi);
00088 #else
00089 #define bi_square(A, B)     bi_multiply(A, bi_copy(B), B)
00090 #endif
00091 
00092 #ifdef CONFIG_BIGINT_CRT
00093 bigint *bi_crt(BI_CTX *ctx, bigint *bi,
00094         bigint *dP, bigint *dQ,
00095         bigint *p, bigint *q,
00096         bigint *qInv);
00097 #endif
00098 
00099 #endif