--- /dev/null
+/**
+ * \file bignum.h
+ *
+ * Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
+ *
+ * Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/* $Cambridge: exim/src/src/pdkim/bignum.h,v 1.2 2009/06/10 07:34:05 tom Exp $ */
+
+#ifndef POLARSSL_BIGNUM_H
+#define POLARSSL_BIGNUM_H
+
+#include <stdio.h>
+
+#define POLARSSL_ERR_MPI_FILE_IO_ERROR -0x0002
+#define POLARSSL_ERR_MPI_BAD_INPUT_DATA -0x0004
+#define POLARSSL_ERR_MPI_INVALID_CHARACTER -0x0006
+#define POLARSSL_ERR_MPI_BUFFER_TOO_SMALL -0x0008
+#define POLARSSL_ERR_MPI_NEGATIVE_VALUE -0x000A
+#define POLARSSL_ERR_MPI_DIVISION_BY_ZERO -0x000C
+#define POLARSSL_ERR_MPI_NOT_ACCEPTABLE -0x000E
+
+#define MPI_CHK(f) if( ( ret = f ) != 0 ) goto cleanup
+
+/*
+ * Define the base integer type, architecture-wise
+ */
+#if defined(POLARSSL_HAVE_INT8)
+typedef unsigned char t_int;
+typedef unsigned short t_dbl;
+#else
+#if defined(POLARSSL_HAVE_INT16)
+typedef unsigned short t_int;
+typedef unsigned long t_dbl;
+#else
+ typedef unsigned long t_int;
+ #if defined(_MSC_VER) && defined(_M_IX86)
+ typedef unsigned __int64 t_dbl;
+ #else
+ #if defined(__amd64__) || defined(__x86_64__) || \
+ defined(__ppc64__) || defined(__powerpc64__) || \
+ defined(__ia64__) || defined(__alpha__)
+ typedef unsigned int t_dbl __attribute__((mode(TI)));
+ #else
+ typedef unsigned long long t_dbl;
+ #endif
+ #endif
+#endif
+#endif
+
+/**
+ * \brief MPI structure
+ */
+typedef struct
+{
+ int s; /*!< integer sign */
+ int n; /*!< total # of limbs */
+ t_int *p; /*!< pointer to limbs */
+}
+mpi;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief Initialize one or more mpi
+ */
+void mpi_init( mpi *X, ... );
+
+/**
+ * \brief Unallocate one or more mpi
+ */
+void mpi_free( mpi *X, ... );
+
+/**
+ * \brief Enlarge to the specified number of limbs
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed
+ */
+int mpi_grow( mpi *X, int nblimbs );
+
+/**
+ * \brief Copy the contents of Y into X
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed
+ */
+int mpi_copy( mpi *X, mpi *Y );
+
+/**
+ * \brief Swap the contents of X and Y
+ */
+void mpi_swap( mpi *X, mpi *Y );
+
+/**
+ * \brief Set value from integer
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed
+ */
+int mpi_lset( mpi *X, int z );
+
+/**
+ * \brief Return the number of least significant bits
+ */
+int mpi_lsb( mpi *X );
+
+/**
+ * \brief Return the number of most significant bits
+ */
+int mpi_msb( mpi *X );
+
+/**
+ * \brief Return the total size in bytes
+ */
+int mpi_size( mpi *X );
+
+/**
+ * \brief Import from an ASCII string
+ *
+ * \param X destination mpi
+ * \param radix input numeric base
+ * \param s null-terminated string buffer
+ *
+ * \return 0 if successful, or an POLARSSL_ERR_MPI_XXX error code
+ */
+int mpi_read_string( mpi *X, int radix, char *s );
+
+/**
+ * \brief Export into an ASCII string
+ *
+ * \param X source mpi
+ * \param radix output numeric base
+ * \param s string buffer
+ * \param slen string buffer size
+ *
+ * \return 0 if successful, or an POLARSSL_ERR_MPI_XXX error code
+ *
+ * \note Call this function with *slen = 0 to obtain the
+ * minimum required buffer size in *slen.
+ */
+int mpi_write_string( mpi *X, int radix, char *s, int *slen );
+
+/**
+ * \brief Read X from an opened file
+ *
+ * \param X destination mpi
+ * \param radix input numeric base
+ * \param fin input file handle
+ *
+ * \return 0 if successful, or an POLARSSL_ERR_MPI_XXX error code
+ */
+int mpi_read_file( mpi *X, int radix, FILE *fin );
+
+/**
+ * \brief Write X into an opened file, or stdout
+ *
+ * \param p prefix, can be NULL
+ * \param X source mpi
+ * \param radix output numeric base
+ * \param fout output file handle
+ *
+ * \return 0 if successful, or an POLARSSL_ERR_MPI_XXX error code
+ *
+ * \note Set fout == NULL to print X on the console.
+ */
+int mpi_write_file( char *p, mpi *X, int radix, FILE *fout );
+
+/**
+ * \brief Import X from unsigned binary data, big endian
+ *
+ * \param X destination mpi
+ * \param buf input buffer
+ * \param buflen input buffer size
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed
+ */
+int mpi_read_binary( mpi *X, unsigned char *buf, int buflen );
+
+/**
+ * \brief Export X into unsigned binary data, big endian
+ *
+ * \param X source mpi
+ * \param buf output buffer
+ * \param buflen output buffer size
+ *
+ * \return 0 if successful,
+ * POLARSSL_ERR_MPI_BUFFER_TOO_SMALL if buf isn't large enough
+ *
+ * \note Call this function with *buflen = 0 to obtain the
+ * minimum required buffer size in *buflen.
+ */
+int mpi_write_binary( mpi *X, unsigned char *buf, int buflen );
+
+/**
+ * \brief Left-shift: X <<= count
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed
+ */
+int mpi_shift_l( mpi *X, int count );
+
+/**
+ * \brief Right-shift: X >>= count
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed
+ */
+int mpi_shift_r( mpi *X, int count );
+
+/**
+ * \brief Compare unsigned values
+ *
+ * \return 1 if |X| is greater than |Y|,
+ * -1 if |X| is lesser than |Y| or
+ * 0 if |X| is equal to |Y|
+ */
+int mpi_cmp_abs( mpi *X, mpi *Y );
+
+/**
+ * \brief Compare signed values
+ *
+ * \return 1 if X is greater than Y,
+ * -1 if X is lesser than Y or
+ * 0 if X is equal to Y
+ */
+int mpi_cmp_mpi( mpi *X, mpi *Y );
+
+/**
+ * \brief Compare signed values
+ *
+ * \return 1 if X is greater than z,
+ * -1 if X is lesser than z or
+ * 0 if X is equal to z
+ */
+int mpi_cmp_int( mpi *X, int z );
+
+/**
+ * \brief Unsigned addition: X = |A| + |B|
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed
+ */
+int mpi_add_abs( mpi *X, mpi *A, mpi *B );
+
+/**
+ * \brief Unsigned substraction: X = |A| - |B|
+ *
+ * \return 0 if successful,
+ * POLARSSL_ERR_MPI_NEGATIVE_VALUE if B is greater than A
+ */
+int mpi_sub_abs( mpi *X, mpi *A, mpi *B );
+
+/**
+ * \brief Signed addition: X = A + B
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed
+ */
+int mpi_add_mpi( mpi *X, mpi *A, mpi *B );
+
+/**
+ * \brief Signed substraction: X = A - B
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed
+ */
+int mpi_sub_mpi( mpi *X, mpi *A, mpi *B );
+
+/**
+ * \brief Signed addition: X = A + b
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed
+ */
+int mpi_add_int( mpi *X, mpi *A, int b );
+
+/**
+ * \brief Signed substraction: X = A - b
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed
+ */
+int mpi_sub_int( mpi *X, mpi *A, int b );
+
+/**
+ * \brief Baseline multiplication: X = A * B
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed
+ */
+int mpi_mul_mpi( mpi *X, mpi *A, mpi *B );
+
+/**
+ * \brief Baseline multiplication: X = A * b
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed
+ */
+int mpi_mul_int( mpi *X, mpi *A, t_int b );
+
+/**
+ * \brief Division by mpi: A = Q * B + R
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed,
+ * POLARSSL_ERR_MPI_DIVISION_BY_ZERO if B == 0
+ *
+ * \note Either Q or R can be NULL.
+ */
+int mpi_div_mpi( mpi *Q, mpi *R, mpi *A, mpi *B );
+
+/**
+ * \brief Division by int: A = Q * b + R
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed,
+ * POLARSSL_ERR_MPI_DIVISION_BY_ZERO if b == 0
+ *
+ * \note Either Q or R can be NULL.
+ */
+int mpi_div_int( mpi *Q, mpi *R, mpi *A, int b );
+
+/**
+ * \brief Modulo: R = A mod B
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed,
+ * POLARSSL_ERR_MPI_DIVISION_BY_ZERO if B == 0
+ */
+int mpi_mod_mpi( mpi *R, mpi *A, mpi *B );
+
+/**
+ * \brief Modulo: r = A mod b
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed,
+ * POLARSSL_ERR_MPI_DIVISION_BY_ZERO if b == 0
+ */
+int mpi_mod_int( t_int *r, mpi *A, int b );
+
+/**
+ * \brief Sliding-window exponentiation: X = A^E mod N
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed,
+ * POLARSSL_ERR_MPI_BAD_INPUT_DATA if N is negative or even
+ *
+ * \note _RR is used to avoid re-computing R*R mod N across
+ * multiple calls, which speeds up things a bit. It can
+ * be set to NULL if the extra performance is unneeded.
+ */
+int mpi_exp_mod( mpi *X, mpi *A, mpi *E, mpi *N, mpi *_RR );
+
+/**
+ * \brief Greatest common divisor: G = gcd(A, B)
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed
+ */
+int mpi_gcd( mpi *G, mpi *A, mpi *B );
+
+/**
+ * \brief Modular inverse: X = A^-1 mod N
+ *
+ * \return 0 if successful,
+ * 1 if memory allocation failed,
+ * POLARSSL_ERR_MPI_BAD_INPUT_DATA if N is negative or nil
+ * POLARSSL_ERR_MPI_NOT_ACCEPTABLE if A has no inverse mod N
+ */
+int mpi_inv_mod( mpi *X, mpi *A, mpi *N );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* bignum.h */
git://git.exim.org / users / jgh / exim.git / blobdiff