bigint.c File Reference

#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <stdio.h>
#include <time.h>
#include "bigint.h"
#include "crypto.h"

Go to the source code of this file.

Functions
static bigint *	bi_int_multiply (BI_CTX *ctx, bigint *bia, comp b)
	Perform a multiply between a bigint an an (unsigned) integer.
static bigint *	bi_int_divide (BI_CTX *ctx, bigint *biR, comp denom)
static bigint __malloc *	alloc (BI_CTX *ctx, int size)
static bigint *	trim (bigint *bi)
static void	more_comps (bigint *bi, int n)
BI_CTX *	bi_initialize (void)
	Start a new bigint context.
void	bi_terminate (BI_CTX *ctx)
	Close the bigint context and free any resources.
bigint *	bi_copy (bigint *bi)
	Increment the number of references to this object.
void	bi_permanent (bigint *bi)
	Simply make a bigint object "unfreeable" if bi_free() is called on it.
void	bi_depermanent (bigint *bi)
	Take a permanent object and make it eligible for freedom.
void	bi_free (BI_CTX *ctx, bigint *bi)
	Free a bigint object so it can be used again.
bigint *	int_to_bi (BI_CTX *ctx, comp i)
	Convert an (unsigned) integer into a bigint.
bigint *	bi_clone (BI_CTX *ctx, const bigint *bi)
	Do a full copy of the bigint object.
bigint *	bi_add (BI_CTX *ctx, bigint *bia, bigint *bib)
	Perform an addition operation between two bigints.
bigint *	bi_subtract (BI_CTX *ctx, bigint *bia, bigint *bib, int *is_negative)
	Perform a subtraction operation between two bigints.
bigint *	bi_divide (BI_CTX *ctx, bigint *u, bigint *v, int is_mod)
	Does both division and modulo calculations.
static bigint *	bi_int_divide (BI_CTX *ctx __unused, bigint *biR, comp denom)
bigint *	bi_import (BI_CTX *ctx, const uint8_t *data, int size)
	Allow a binary sequence to be imported as a bigint.
void	bi_export (BI_CTX *ctx, bigint *x, uint8_t *data, int size)
	Take a bigint and convert it into a byte sequence.
void	bi_set_mod (BI_CTX *ctx, bigint *bim, int mod_offset)
	Pre-calculate some of the expensive steps in reduction.
void	bi_free_mod (BI_CTX *ctx, int mod_offset)
	Used when cleaning various bigints at the end of a session.
static bigint *	regular_multiply (BI_CTX *ctx, bigint *bia, bigint *bib)
	Perform a standard multiplication between two bigints.
bigint *	bi_multiply (BI_CTX *ctx, bigint *bia, bigint *bib)
	Perform a multiplication operation between two bigints.
int	bi_compare (bigint *bia, bigint *bib)
	Compare two bigints.
static int	find_max_exp_index (bigint *biexp)
static int	exp_bit_is_one (bigint *biexp, int offset)
bigint *	bi_mod_power (BI_CTX *ctx, bigint *bi, bigint *biexp)
	Perform a modular exponentiation.
bigint *	bi_mod_power2 (BI_CTX *ctx, bigint *bi, bigint *bim, bigint *biexp)
	Perform a modular exponentiation using a temporary modulus.