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simplesshd/dropbear/libtommath/tommath_private.h

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/* LibTomMath, multiple-precision integer library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */
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#ifndef TOMMATH_PRIV_H_
#define TOMMATH_PRIV_H_
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#include "tommath.h"
#include "tommath_class.h"
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/*
* Private symbols
* ---------------
*
* On Unix symbols can be marked as hidden if libtommath is compiled
* as a shared object. By default, symbols are visible.
* As of now, this feature is opt-in via the MP_PRIVATE_SYMBOLS define.
*
* On Win32 a .def file must be used to specify the exported symbols.
*/
#if defined (MP_PRIVATE_SYMBOLS) && defined(__GNUC__) && __GNUC__ >= 4
# define MP_PRIVATE __attribute__ ((visibility ("hidden")))
#else
# define MP_PRIVATE
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#endif
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/* Hardening libtommath
* --------------------
*
* By default memory is zeroed before calling
* MP_FREE to avoid leaking data. This is good
* practice in cryptographical applications.
*
* Note however that memory allocators used
* in cryptographical applications can often
* be configured by itself to clear memory,
* rendering the clearing in tommath unnecessary.
* See for example https://github.com/GrapheneOS/hardened_malloc
* and the option CONFIG_ZERO_ON_FREE.
*
* Furthermore there are applications which
* value performance more and want this
* feature to be disabled. For such applications
* define MP_NO_ZERO_ON_FREE during compilation.
*/
#ifdef MP_NO_ZERO_ON_FREE
# define MP_FREE_BUFFER(mem, size) MP_FREE((mem), (size))
# define MP_FREE_DIGITS(mem, digits) MP_FREE((mem), sizeof (mp_digit) * (size_t)(digits))
#else
# define MP_FREE_BUFFER(mem, size) \
do { \
size_t fs_ = (size); \
void* fm_ = (mem); \
if (fm_ != NULL) { \
MP_ZERO_BUFFER(fm_, fs_); \
MP_FREE(fm_, fs_); \
} \
} while (0)
# define MP_FREE_DIGITS(mem, digits) \
do { \
int fd_ = (digits); \
void* fm_ = (mem); \
if (fm_ != NULL) { \
size_t fs_ = sizeof (mp_digit) * (size_t)fd_; \
MP_ZERO_BUFFER(fm_, fs_); \
MP_FREE(fm_, fs_); \
} \
} while (0)
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#endif
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#ifdef MP_USE_MEMSET
# include <string.h>
# define MP_ZERO_BUFFER(mem, size) memset((mem), 0, (size))
# define MP_ZERO_DIGITS(mem, digits) \
do { \
int zd_ = (digits); \
if (zd_ > 0) { \
memset((mem), 0, sizeof(mp_digit) * (size_t)zd_); \
} \
} while (0)
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#else
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# define MP_ZERO_BUFFER(mem, size) \
do { \
size_t zs_ = (size); \
char* zm_ = (char*)(mem); \
while (zs_-- > 0u) { \
*zm_++ = '\0'; \
} \
} while (0)
# define MP_ZERO_DIGITS(mem, digits) \
do { \
int zd_ = (digits); \
mp_digit* zm_ = (mem); \
while (zd_-- > 0) { \
*zm_++ = 0; \
} \
} while (0)
#endif
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/* Tunable cutoffs
* ---------------
*
* - In the default settings, a cutoff X can be modified at runtime
* by adjusting the corresponding X_CUTOFF variable.
*
* - Tunability of the library can be disabled at compile time
* by defining the MP_FIXED_CUTOFFS macro.
*
* - There is an additional file tommath_cutoffs.h, which defines
* the default cutoffs. These can be adjusted manually or by the
* autotuner.
*
*/
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#ifdef MP_FIXED_CUTOFFS
# include "tommath_cutoffs.h"
# define MP_KARATSUBA_MUL_CUTOFF MP_DEFAULT_KARATSUBA_MUL_CUTOFF
# define MP_KARATSUBA_SQR_CUTOFF MP_DEFAULT_KARATSUBA_SQR_CUTOFF
# define MP_TOOM_MUL_CUTOFF MP_DEFAULT_TOOM_MUL_CUTOFF
# define MP_TOOM_SQR_CUTOFF MP_DEFAULT_TOOM_SQR_CUTOFF
#else
# define MP_KARATSUBA_MUL_CUTOFF KARATSUBA_MUL_CUTOFF
# define MP_KARATSUBA_SQR_CUTOFF KARATSUBA_SQR_CUTOFF
# define MP_TOOM_MUL_CUTOFF TOOM_MUL_CUTOFF
# define MP_TOOM_SQR_CUTOFF TOOM_SQR_CUTOFF
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#endif
/* define heap macros */
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#ifndef MP_MALLOC
/* default to libc stuff */
# include <stdlib.h>
# define MP_MALLOC(size) malloc(size)
# define MP_REALLOC(mem, oldsize, newsize) realloc((mem), (newsize))
# define MP_CALLOC(nmemb, size) calloc((nmemb), (size))
# define MP_FREE(mem, size) free(mem)
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#else
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/* prototypes for our heap functions */
extern void *MP_MALLOC(size_t size);
extern void *MP_REALLOC(void *mem, size_t oldsize, size_t newsize);
extern void *MP_CALLOC(size_t nmemb, size_t size);
extern void MP_FREE(void *mem, size_t size);
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#endif
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/* feature detection macro */
#ifdef _MSC_VER
/* Prevent false positive: not enough arguments for function-like macro invocation */
#pragma warning(disable: 4003)
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#endif
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#define MP_STRINGIZE(x) MP__STRINGIZE(x)
#define MP__STRINGIZE(x) ""#x""
#define MP_HAS(x) (sizeof(MP_STRINGIZE(BN_##x##_C)) == 1u)
/* TODO: Remove private_mp_word as soon as deprecated mp_word is removed from tommath. */
#undef mp_word
typedef private_mp_word mp_word;
#define MP_MIN(x, y) (((x) < (y)) ? (x) : (y))
#define MP_MAX(x, y) (((x) > (y)) ? (x) : (y))
/* Static assertion */
#define MP_STATIC_ASSERT(msg, cond) typedef char mp_static_assert_##msg[(cond) ? 1 : -1];
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/* ---> Basic Manipulations <--- */
#define MP_IS_ZERO(a) ((a)->used == 0)
#define MP_IS_EVEN(a) (((a)->used == 0) || (((a)->dp[0] & 1u) == 0u))
#define MP_IS_ODD(a) (((a)->used > 0) && (((a)->dp[0] & 1u) == 1u))
#define MP_SIZEOF_BITS(type) ((size_t)CHAR_BIT * sizeof(type))
#define MP_MAXFAST (int)(1uL << (MP_SIZEOF_BITS(mp_word) - (2u * (size_t)MP_DIGIT_BIT)))
/* TODO: Remove PRIVATE_MP_WARRAY as soon as deprecated MP_WARRAY is removed from tommath.h */
#undef MP_WARRAY
#define MP_WARRAY PRIVATE_MP_WARRAY
/* TODO: Remove PRIVATE_MP_PREC as soon as deprecated MP_PREC is removed from tommath.h */
#ifdef PRIVATE_MP_PREC
# undef MP_PREC
# define MP_PREC PRIVATE_MP_PREC
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#endif
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/* Minimum number of available digits in mp_int, MP_PREC >= MP_MIN_PREC */
#define MP_MIN_PREC ((((int)MP_SIZEOF_BITS(long long) + MP_DIGIT_BIT) - 1) / MP_DIGIT_BIT)
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MP_STATIC_ASSERT(prec_geq_min_prec, MP_PREC >= MP_MIN_PREC)
/* random number source */
extern MP_PRIVATE mp_err(*s_mp_rand_source)(void *out, size_t size);
/* lowlevel functions, do not call! */
MP_PRIVATE mp_bool s_mp_get_bit(const mp_int *a, unsigned int b);
MP_PRIVATE mp_err s_mp_add(const mp_int *a, const mp_int *b, mp_int *c) MP_WUR;
MP_PRIVATE mp_err s_mp_sub(const mp_int *a, const mp_int *b, mp_int *c) MP_WUR;
MP_PRIVATE mp_err s_mp_mul_digs_fast(const mp_int *a, const mp_int *b, mp_int *c, int digs) MP_WUR;
MP_PRIVATE mp_err s_mp_mul_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs) MP_WUR;
MP_PRIVATE mp_err s_mp_mul_high_digs_fast(const mp_int *a, const mp_int *b, mp_int *c, int digs) MP_WUR;
MP_PRIVATE mp_err s_mp_mul_high_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs) MP_WUR;
MP_PRIVATE mp_err s_mp_sqr_fast(const mp_int *a, mp_int *b) MP_WUR;
MP_PRIVATE mp_err s_mp_sqr(const mp_int *a, mp_int *b) MP_WUR;
MP_PRIVATE mp_err s_mp_balance_mul(const mp_int *a, const mp_int *b, mp_int *c) MP_WUR;
MP_PRIVATE mp_err s_mp_karatsuba_mul(const mp_int *a, const mp_int *b, mp_int *c) MP_WUR;
MP_PRIVATE mp_err s_mp_toom_mul(const mp_int *a, const mp_int *b, mp_int *c) MP_WUR;
MP_PRIVATE mp_err s_mp_karatsuba_sqr(const mp_int *a, mp_int *b) MP_WUR;
MP_PRIVATE mp_err s_mp_toom_sqr(const mp_int *a, mp_int *b) MP_WUR;
MP_PRIVATE mp_err s_mp_invmod_fast(const mp_int *a, const mp_int *b, mp_int *c) MP_WUR;
MP_PRIVATE mp_err s_mp_invmod_slow(const mp_int *a, const mp_int *b, mp_int *c) MP_WUR;
MP_PRIVATE mp_err s_mp_montgomery_reduce_fast(mp_int *x, const mp_int *n, mp_digit rho) MP_WUR;
MP_PRIVATE mp_err s_mp_exptmod_fast(const mp_int *G, const mp_int *X, const mp_int *P, mp_int *Y, int redmode) MP_WUR;
MP_PRIVATE mp_err s_mp_exptmod(const mp_int *G, const mp_int *X, const mp_int *P, mp_int *Y, int redmode) MP_WUR;
MP_PRIVATE mp_err s_mp_rand_platform(void *p, size_t n) MP_WUR;
MP_PRIVATE mp_err s_mp_prime_random_ex(mp_int *a, int t, int size, int flags, private_mp_prime_callback cb, void *dat);
MP_PRIVATE void s_mp_reverse(unsigned char *s, size_t len);
MP_PRIVATE mp_err s_mp_prime_is_divisible(const mp_int *a, mp_bool *result);
/* TODO: jenkins prng is not thread safe as of now */
MP_PRIVATE mp_err s_mp_rand_jenkins(void *p, size_t n) MP_WUR;
MP_PRIVATE void s_mp_rand_jenkins_init(uint64_t seed);
extern MP_PRIVATE const char *const mp_s_rmap;
extern MP_PRIVATE const uint8_t mp_s_rmap_reverse[];
extern MP_PRIVATE const size_t mp_s_rmap_reverse_sz;
extern MP_PRIVATE const mp_digit *s_mp_prime_tab;
/* deprecated functions */
MP_DEPRECATED(s_mp_invmod_fast) mp_err fast_mp_invmod(const mp_int *a, const mp_int *b, mp_int *c);
MP_DEPRECATED(s_mp_montgomery_reduce_fast) mp_err fast_mp_montgomery_reduce(mp_int *x, const mp_int *n,
mp_digit rho);
MP_DEPRECATED(s_mp_mul_digs_fast) mp_err fast_s_mp_mul_digs(const mp_int *a, const mp_int *b, mp_int *c,
int digs);
MP_DEPRECATED(s_mp_mul_high_digs_fast) mp_err fast_s_mp_mul_high_digs(const mp_int *a, const mp_int *b,
mp_int *c,
int digs);
MP_DEPRECATED(s_mp_sqr_fast) mp_err fast_s_mp_sqr(const mp_int *a, mp_int *b);
MP_DEPRECATED(s_mp_balance_mul) mp_err mp_balance_mul(const mp_int *a, const mp_int *b, mp_int *c);
MP_DEPRECATED(s_mp_exptmod_fast) mp_err mp_exptmod_fast(const mp_int *G, const mp_int *X, const mp_int *P,
mp_int *Y,
int redmode);
MP_DEPRECATED(s_mp_invmod_slow) mp_err mp_invmod_slow(const mp_int *a, const mp_int *b, mp_int *c);
MP_DEPRECATED(s_mp_karatsuba_mul) mp_err mp_karatsuba_mul(const mp_int *a, const mp_int *b, mp_int *c);
MP_DEPRECATED(s_mp_karatsuba_sqr) mp_err mp_karatsuba_sqr(const mp_int *a, mp_int *b);
MP_DEPRECATED(s_mp_toom_mul) mp_err mp_toom_mul(const mp_int *a, const mp_int *b, mp_int *c);
MP_DEPRECATED(s_mp_toom_sqr) mp_err mp_toom_sqr(const mp_int *a, mp_int *b);
MP_DEPRECATED(s_mp_reverse) void bn_reverse(unsigned char *s, int len);
#define MP_GET_ENDIANNESS(x) \
do{\
int16_t n = 0x1; \
char *p = (char *)&n; \
x = (p[0] == '\x01') ? MP_LITTLE_ENDIAN : MP_BIG_ENDIAN; \
} while (0)
/* code-generating macros */
#define MP_SET_UNSIGNED(name, type) \
void name(mp_int * a, type b) \
{ \
int i = 0; \
while (b != 0u) { \
a->dp[i++] = ((mp_digit)b & MP_MASK); \
if (MP_SIZEOF_BITS(type) <= MP_DIGIT_BIT) { break; } \
b >>= ((MP_SIZEOF_BITS(type) <= MP_DIGIT_BIT) ? 0 : MP_DIGIT_BIT); \
} \
a->used = i; \
a->sign = MP_ZPOS; \
MP_ZERO_DIGITS(a->dp + a->used, a->alloc - a->used); \
}
#define MP_SET_SIGNED(name, uname, type, utype) \
void name(mp_int * a, type b) \
{ \
uname(a, (b < 0) ? -(utype)b : (utype)b); \
if (b < 0) { a->sign = MP_NEG; } \
}
#define MP_INIT_INT(name , set, type) \
mp_err name(mp_int * a, type b) \
{ \
mp_err err; \
if ((err = mp_init(a)) != MP_OKAY) { \
return err; \
} \
set(a, b); \
return MP_OKAY; \
}
#define MP_GET_MAG(name, type) \
type name(const mp_int* a) \
{ \
unsigned i = MP_MIN((unsigned)a->used, (unsigned)((MP_SIZEOF_BITS(type) + MP_DIGIT_BIT - 1) / MP_DIGIT_BIT)); \
type res = 0u; \
while (i --> 0u) { \
res <<= ((MP_SIZEOF_BITS(type) <= MP_DIGIT_BIT) ? 0 : MP_DIGIT_BIT); \
res |= (type)a->dp[i]; \
if (MP_SIZEOF_BITS(type) <= MP_DIGIT_BIT) { break; } \
} \
return res; \
}
#define MP_GET_SIGNED(name, mag, type, utype) \
type name(const mp_int* a) \
{ \
utype res = mag(a); \
return (a->sign == MP_NEG) ? (type)-res : (type)res; \
}
#endif
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