/* LibTomMath, multiple-precision integer library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */

#ifndef BN_H_
#define BN_H_

#include <stdint.h>
#include <stddef.h>
#include <limits.h>

#ifdef LTM_NO_FILE
#warning LTM_NO_FILE has been deprecated, use MP_NO_FILE.
#define MP_NO_FILE
#endif

#ifndef MP_NO_FILE
#include <stdio.h>
#endif

#ifdef MP_8BIT
#ifdef _MSC_VER
#pragma message("8-bit (MP_8BIT) support is deprecated and will be dropped completely in the next version.")
#else
#warning "8-bit (MP_8BIT) support is deprecated and will be dropped completely in the next version."
#endif
#endif

#ifdef __cplusplus
extern "C" {
#endif

/* MS Visual C++ doesn't have a 128bit type for words, so fall back to 32bit MPI's (where words are 64bit) */
#if (defined(_MSC_VER) || defined(__LLP64__) || defined(__e2k__) || defined(__LCC__)) && !defined(MP_64BIT)
#define MP_32BIT
#endif

/* detect 64-bit mode if possible */
#if defined(__x86_64__) || defined(_M_X64) || defined(_M_AMD64) || \
    defined(__powerpc64__) || defined(__ppc64__) || defined(__PPC64__) || \
    defined(__s390x__) || defined(__arch64__) || defined(__aarch64__) || \
    defined(__sparcv9) || defined(__sparc_v9__) || defined(__sparc64__) || \
    defined(__ia64) || defined(__ia64__) || defined(__itanium__) || defined(_M_IA64) || \
    defined(__LP64__) || defined(_LP64) || defined(__64BIT__)
#if !(defined(MP_64BIT) || defined(MP_32BIT) || defined(MP_16BIT) || defined(MP_8BIT))
#if defined(__GNUC__) && !defined(__hppa)
/* we support 128bit integers only via: __attribute__((mode(TI))) */
#define MP_64BIT
#else
/* otherwise we fall back to MP_32BIT even on 64bit platforms */
#define MP_32BIT
#endif
#endif
#endif

#ifdef MP_DIGIT_BIT
#error Defining MP_DIGIT_BIT is disallowed, use MP_8/16/31/32/64BIT
#endif

/* some default configurations.
 *
 * A "mp_digit" must be able to hold MP_DIGIT_BIT + 1 bits
 * A "mp_word" must be able to hold 2*MP_DIGIT_BIT + 1 bits
 *
 * At the very least a mp_digit must be able to hold 7 bits
 * [any size beyond that is ok provided it doesn't overflow the data type]
 */

#ifdef MP_8BIT
  typedef uint8_t mp_digit;
  typedef uint16_t private_mp_word;
#define MP_DIGIT_BIT 7
#elif defined(MP_16BIT)
  typedef uint16_t mp_digit;
  typedef uint32_t private_mp_word;
#define MP_DIGIT_BIT 15
#elif defined(MP_64BIT)
/* for GCC only on supported platforms */
  typedef uint64_t mp_digit;
#if defined(__GNUC__)
  typedef unsigned long private_mp_word __attribute__((mode(TI)));
#endif
#define MP_DIGIT_BIT 60
#else
  typedef uint32_t mp_digit;
  typedef uint64_t private_mp_word;
#ifdef MP_31BIT
/*
 * This is an extension that uses 31-bit digits.
 * Please be aware that not all functions support this size, especially s_mp_mul_digs_fast
 * will be reduced to work on small numbers only:
 * Up to 8 limbs, 248 bits instead of up to 512 limbs, 15872 bits with MP_28BIT.
 */
#define MP_DIGIT_BIT 31
#else
/* default case is 28-bit digits, defines MP_28BIT as a handy macro to test */
#define MP_DIGIT_BIT 28
#define MP_28BIT
#endif
#endif

/* mp_word is a private type */
#define mp_word MP_DEPRECATED_PRAGMA("mp_word has been made private") private_mp_word

#define MP_SIZEOF_MP_DIGIT (MP_DEPRECATED_PRAGMA("MP_SIZEOF_MP_DIGIT has been deprecated, use sizeof (mp_digit)") sizeof (mp_digit))

#define MP_MASK          ((((mp_digit)1)<<((mp_digit)MP_DIGIT_BIT))-((mp_digit)1))
#define MP_DIGIT_MAX     MP_MASK

/* Primality generation flags */
#define MP_PRIME_BBS      0x0001        /* BBS style prime */
#define MP_PRIME_SAFE     0x0002        /* Safe prime (p-1)/2 == prime */
#define MP_PRIME_2MSB_ON  0x0008        /* force 2nd MSB to 1 */

#define LTM_PRIME_BBS      (MP_DEPRECATED_PRAGMA("LTM_PRIME_BBS has been deprecated, use MP_PRIME_BBS") MP_PRIME_BBS)
#define LTM_PRIME_SAFE     (MP_DEPRECATED_PRAGMA("LTM_PRIME_SAFE has been deprecated, use MP_PRIME_SAFE") MP_PRIME_SAFE)
#define LTM_PRIME_2MSB_ON  (MP_DEPRECATED_PRAGMA("LTM_PRIME_2MSB_ON has been deprecated, use MP_PRIME_2MSB_ON") MP_PRIME_2MSB_ON)

#ifdef MP_USE_ENUMS
  typedef enum {
    MP_ZPOS = 0,                /* positive */
    MP_NEG = 1                  /* negative */
  } mp_sign;
  typedef enum {
    MP_LT = -1,                 /* less than */
    MP_EQ = 0,                  /* equal */
    MP_GT = 1                   /* greater than */
  } mp_ord;
  typedef enum {
    MP_NO = 0,
    MP_YES = 1
  } mp_bool;
  typedef enum {
    MP_OKAY = 0,                /* no error */
    MP_ERR = -1,                /* unknown error */
    MP_MEM = -2,                /* out of mem */
    MP_VAL = -3,                /* invalid input */
    MP_ITER = -4,               /* maximum iterations reached */
    MP_BUF = -5                 /* buffer overflow, supplied buffer too small */
  } mp_err;
  typedef enum {
    MP_LSB_FIRST = -1,
    MP_MSB_FIRST = 1
  } mp_order;
  typedef enum {
    MP_LITTLE_ENDIAN = -1,
    MP_NATIVE_ENDIAN = 0,
    MP_BIG_ENDIAN = 1
  } mp_endian;
#else
  typedef int mp_sign;
#define MP_ZPOS       0         /* positive integer */
#define MP_NEG        1         /* negative */
  typedef int mp_ord;
#define MP_LT        -1         /* less than */
#define MP_EQ         0         /* equal to */
#define MP_GT         1         /* greater than */
  typedef int mp_bool;
#define MP_YES        1
#define MP_NO         0
  typedef int mp_err;
#define MP_OKAY       0         /* no error */
#define MP_ERR        -1        /* unknown error */
#define MP_MEM        -2        /* out of mem */
#define MP_VAL        -3        /* invalid input */
#define MP_RANGE      (MP_DEPRECATED_PRAGMA("MP_RANGE has been deprecated in favor of MP_VAL") MP_VAL)
#define MP_ITER       -4        /* maximum iterations reached */
#define MP_BUF        -5        /* buffer overflow, supplied buffer too small */
  typedef int mp_order;
#define MP_LSB_FIRST -1
#define MP_MSB_FIRST  1
  typedef int mp_endian;
#define MP_LITTLE_ENDIAN  -1
#define MP_NATIVE_ENDIAN  0
#define MP_BIG_ENDIAN     1
#endif

/* tunable cutoffs */

#ifndef MP_FIXED_CUTOFFS
  extern int
   KARATSUBA_MUL_CUTOFF, KARATSUBA_SQR_CUTOFF, TOOM_MUL_CUTOFF, TOOM_SQR_CUTOFF;
#endif

/* define this to use lower memory usage routines (exptmods mostly) */
/* #define MP_LOW_MEM */

/* default precision */
#ifndef MP_PREC
#ifndef MP_LOW_MEM
#define PRIVATE_MP_PREC 32      /* default digits of precision */
#elif defined(MP_8BIT)
#define PRIVATE_MP_PREC 16      /* default digits of precision */
#else
#define PRIVATE_MP_PREC 8       /* default digits of precision */
#endif
#define MP_PREC (MP_DEPRECATED_PRAGMA("MP_PREC is an internal macro") PRIVATE_MP_PREC)
#endif

/* size of comba arrays, should be at least 2 * 2**(BITS_PER_WORD - BITS_PER_DIGIT*2) */
#define PRIVATE_MP_WARRAY (int)(1uLL << (((CHAR_BIT * sizeof(private_mp_word)) - (2 * MP_DIGIT_BIT)) + 1))
#define MP_WARRAY (MP_DEPRECATED_PRAGMA("MP_WARRAY is an internal macro") PRIVATE_MP_WARRAY)

#if defined(__GNUC__) && __GNUC__ >= 4
#define MP_NULL_TERMINATED __attribute__((sentinel))
#else
#define MP_NULL_TERMINATED
#endif

/*
 * MP_WUR - warn unused result
 * ---------------------------
 *
 * The result of functions annotated with MP_WUR must be
 * checked and cannot be ignored.
 *
 * Most functions in libtommath return an error code.
 * This error code must be checked in order to prevent crashes or invalid
 * results.
 *
 * If you still want to avoid the error checks for quick and dirty programs
 * without robustness guarantees, you can `#define MP_WUR` before including
 * tommath.h, disabling the warnings.
 */
#ifndef MP_WUR
#if defined(__GNUC__) && __GNUC__ >= 4
#define MP_WUR __attribute__((warn_unused_result))
#else
#define MP_WUR
#endif
#endif

#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 405)
#define MP_DEPRECATED(x) __attribute__((deprecated("replaced by " #x)))
#define PRIVATE_MP_DEPRECATED_PRAGMA(s) _Pragma(#s)
#define MP_DEPRECATED_PRAGMA(s) PRIVATE_MP_DEPRECATED_PRAGMA(GCC warning s)
#elif defined(_MSC_VER) && _MSC_VER >= 1500
#define MP_DEPRECATED(x) __declspec(deprecated("replaced by " #x))
#define MP_DEPRECATED_PRAGMA(s) __pragma(message(s))
#else
#define MP_DEPRECATED(s)
#define MP_DEPRECATED_PRAGMA(s)
#endif

#define DIGIT_BIT   (MP_DEPRECATED_PRAGMA("DIGIT_BIT macro is deprecated, MP_DIGIT_BIT instead") MP_DIGIT_BIT)
#define USED(m)     (MP_DEPRECATED_PRAGMA("USED macro is deprecated, use z->used instead") (m)->used)
#define DIGIT(m, k) (MP_DEPRECATED_PRAGMA("DIGIT macro is deprecated, use z->dp instead") (m)->dp[(k)])
#define SIGN(m)     (MP_DEPRECATED_PRAGMA("SIGN macro is deprecated, use z->sign instead") (m)->sign)

/* the infamous mp_int structure */
  typedef struct {
    int used, alloc;
    mp_sign sign;
    mp_digit *dp;
  } mp_int;

/* callback for mp_prime_random, should fill dst with random bytes and return how many read [upto len] */
  typedef int private_mp_prime_callback(unsigned char *dst, int len, void *dat);
  typedef private_mp_prime_callback MP_DEPRECATED(mp_rand_source)
      ltm_prime_callback;

/* error code to char* string */
  const char *mp_error_to_string(mp_err code) MP_WUR;

/* ---> init and deinit bignum functions <--- */
/* init a bignum */
  mp_err mp_init(mp_int * a) MP_WUR;

/* free a bignum */
  void mp_clear(mp_int * a);

/* init a null terminated series of arguments */
  mp_err mp_init_multi(mp_int * mp, ...) MP_NULL_TERMINATED MP_WUR;

/* clear a null terminated series of arguments */
  void mp_clear_multi(mp_int * mp, ...) MP_NULL_TERMINATED;

/* exchange two ints */
  void mp_exch(mp_int * a, mp_int * b);

/* shrink ram required for a bignum */
  mp_err mp_shrink(mp_int * a) MP_WUR;

/* grow an int to a given size */
  mp_err mp_grow(mp_int * a, int size) MP_WUR;

/* init to a given number of digits */
  mp_err mp_init_size(mp_int * a, int size) MP_WUR;

/* ---> Basic Manipulations <--- */
#define mp_iszero(a) (((a)->used == 0) ? MP_YES : MP_NO)
  mp_bool mp_iseven(const mp_int * a) MP_WUR;
  mp_bool mp_isodd(const mp_int * a) MP_WUR;
#define mp_isneg(a)  (((a)->sign != MP_ZPOS) ? MP_YES : MP_NO)

/* set to zero */
  void mp_zero(mp_int * a);

/* get and set doubles */
  double mp_get_double(const mp_int * a) MP_WUR;
  mp_err mp_set_double(mp_int * a, double b) MP_WUR;

/* get integer, set integer and init with integer (int32_t) */
  int32_t mp_get_i32(const mp_int * a) MP_WUR;
  void mp_set_i32(mp_int * a, int32_t b);
  mp_err mp_init_i32(mp_int * a, int32_t b) MP_WUR;

/* get integer, set integer and init with integer, behaves like two complement for negative numbers (uint32_t) */
#define mp_get_u32(a) ((uint32_t)mp_get_i32(a))
  void mp_set_u32(mp_int * a, uint32_t b);
  mp_err mp_init_u32(mp_int * a, uint32_t b) MP_WUR;

/* get integer, set integer and init with integer (int64_t) */
  int64_t mp_get_i64(const mp_int * a) MP_WUR;
  void mp_set_i64(mp_int * a, int64_t b);
  mp_err mp_init_i64(mp_int * a, int64_t b) MP_WUR;

/* get integer, set integer and init with integer, behaves like two complement for negative numbers (uint64_t) */
#define mp_get_u64(a) ((uint64_t)mp_get_i64(a))
  void mp_set_u64(mp_int * a, uint64_t b);
  mp_err mp_init_u64(mp_int * a, uint64_t b) MP_WUR;

/* get magnitude */
  uint32_t mp_get_mag_u32(const mp_int * a) MP_WUR;
  uint64_t mp_get_mag_u64(const mp_int * a) MP_WUR;
  unsigned long mp_get_mag_ul(const mp_int * a) MP_WUR;
  unsigned long long mp_get_mag_ull(const mp_int * a) MP_WUR;

/* get integer, set integer (long) */
  long mp_get_l(const mp_int * a) MP_WUR;
  void mp_set_l(mp_int * a, long b);
  mp_err mp_init_l(mp_int * a, long b) MP_WUR;

/* get integer, set integer (unsigned long) */
#define mp_get_ul(a) ((unsigned long)mp_get_l(a))
  void mp_set_ul(mp_int * a, unsigned long b);
  mp_err mp_init_ul(mp_int * a, unsigned long b) MP_WUR;

/* get integer, set integer (long long) */
  long long mp_get_ll(const mp_int * a) MP_WUR;
  void mp_set_ll(mp_int * a, long long b);
  mp_err mp_init_ll(mp_int * a, long long b) MP_WUR;

/* get integer, set integer (unsigned long long) */
#define mp_get_ull(a) ((unsigned long long)mp_get_ll(a))
  void mp_set_ull(mp_int * a, unsigned long long b);
  mp_err mp_init_ull(mp_int * a, unsigned long long b) MP_WUR;

/* set to single unsigned digit, up to MP_DIGIT_MAX */
  void mp_set(mp_int * a, mp_digit b);
  mp_err mp_init_set(mp_int * a, mp_digit b) MP_WUR;

/* get integer, set integer and init with integer (deprecated) */
   MP_DEPRECATED(mp_get_mag_u32 /
                 mp_get_u32) unsigned long mp_get_int(const mp_int * a) MP_WUR;
   MP_DEPRECATED(mp_get_mag_ul /
                 mp_get_ul) unsigned long mp_get_long(const mp_int * a) MP_WUR;
   MP_DEPRECATED(mp_get_mag_ull /
                 mp_get_ull) unsigned long long mp_get_long_long(const mp_int *
                                                                 a) MP_WUR;
   MP_DEPRECATED(mp_set_ul) mp_err mp_set_int(mp_int * a, unsigned long b);
   MP_DEPRECATED(mp_set_ul) mp_err mp_set_long(mp_int * a, unsigned long b);
   MP_DEPRECATED(mp_set_ull) mp_err mp_set_long_long(mp_int * a,
                                                     unsigned long long b);
   MP_DEPRECATED(mp_init_ul) mp_err mp_init_set_int(mp_int * a,
                                                    unsigned long b) MP_WUR;

/* copy, b = a */
  mp_err mp_copy(const mp_int * a, mp_int * b) MP_WUR;

/* inits and copies, a = b */
  mp_err mp_init_copy(mp_int * a, const mp_int * b) MP_WUR;

/* trim unused digits */
  void mp_clamp(mp_int * a);

/* export binary data */
   MP_DEPRECATED(mp_pack) mp_err mp_export(void *rop, size_t *countp, int order,
                                           size_t size, int endian,
                                           size_t nails,
                                           const mp_int * op) MP_WUR;

/* import binary data */
   MP_DEPRECATED(mp_unpack) mp_err mp_import(mp_int * rop, size_t count,
                                             int order, size_t size, int endian,
                                             size_t nails,
                                             const void *op) MP_WUR;

/* unpack binary data */
  mp_err mp_unpack(mp_int * rop, size_t count, mp_order order, size_t size,
                   mp_endian endian, size_t nails, const void *op) MP_WUR;

/* pack binary data */
  size_t mp_pack_count(const mp_int * a, size_t nails, size_t size) MP_WUR;
  mp_err mp_pack(void *rop, size_t maxcount, size_t *written, mp_order order,
                 size_t size, mp_endian endian, size_t nails,
                 const mp_int * op) MP_WUR;

/* ---> digit manipulation <--- */

/* right shift by "b" digits */
  void mp_rshd(mp_int * a, int b);

/* left shift by "b" digits */
  mp_err mp_lshd(mp_int * a, int b) MP_WUR;

/* c = a / 2**b, implemented as c = a >> b */
  mp_err mp_div_2d(const mp_int * a, int b, mp_int * c, mp_int * d) MP_WUR;

/* b = a/2 */
  mp_err mp_div_2(const mp_int * a, mp_int * b) MP_WUR;

/* a/3 => 3c + d == a */
  mp_err mp_div_3(const mp_int * a, mp_int * c, mp_digit * d) MP_WUR;

/* c = a * 2**b, implemented as c = a << b */
  mp_err mp_mul_2d(const mp_int * a, int b, mp_int * c) MP_WUR;

/* b = a*2 */
  mp_err mp_mul_2(const mp_int * a, mp_int * b) MP_WUR;

/* c = a mod 2**b */
  mp_err mp_mod_2d(const mp_int * a, int b, mp_int * c) MP_WUR;

/* computes a = 2**b */
  mp_err mp_2expt(mp_int * a, int b) MP_WUR;

/* Counts the number of lsbs which are zero before the first zero bit */
  int mp_cnt_lsb(const mp_int * a) MP_WUR;

/* I Love Earth! */

/* makes a pseudo-random mp_int of a given size */
  mp_err mp_rand(mp_int * a, int digits) MP_WUR;
/* makes a pseudo-random small int of a given size */
   MP_DEPRECATED(mp_rand) mp_err mp_rand_digit(mp_digit * r) MP_WUR;
/* use custom random data source instead of source provided the platform */
  void mp_rand_source(mp_err(*source) (void *out, size_t size));

#ifdef MP_PRNG_ENABLE_LTM_RNG
#warning MP_PRNG_ENABLE_LTM_RNG has been deprecated, use mp_rand_source instead.
/* A last resort to provide random data on systems without any of the other
 * implemented ways to gather entropy.
 * It is compatible with `rng_get_bytes()` from libtomcrypt so you could
 * provide that one and then set `ltm_rng = rng_get_bytes;` */
  extern unsigned long (*ltm_rng)(unsigned char *out, unsigned long outlen,
                                  void(*callback)(void));
  extern void (*ltm_rng_callback)(void);
#endif

/* ---> binary operations <--- */

/* Checks the bit at position b and returns MP_YES
 * if the bit is 1, MP_NO if it is 0 and MP_VAL
 * in case of error
 */
   MP_DEPRECATED(s_mp_get_bit) int mp_get_bit(const mp_int * a, int b) MP_WUR;

/* c = a XOR b (two complement) */
   MP_DEPRECATED(mp_xor) mp_err mp_tc_xor(const mp_int * a, const mp_int * b,
                                          mp_int * c) MP_WUR;
  mp_err mp_xor(const mp_int * a, const mp_int * b, mp_int * c) MP_WUR;

/* c = a OR b (two complement) */
   MP_DEPRECATED(mp_or) mp_err mp_tc_or(const mp_int * a, const mp_int * b,
                                        mp_int * c) MP_WUR;
  mp_err mp_or(const mp_int * a, const mp_int * b, mp_int * c) MP_WUR;

/* c = a AND b (two complement) */
   MP_DEPRECATED(mp_and) mp_err mp_tc_and(const mp_int * a, const mp_int * b,
                                          mp_int * c) MP_WUR;
  mp_err mp_and(const mp_int * a, const mp_int * b, mp_int * c) MP_WUR;

/* b = ~a (bitwise not, two complement) */
  mp_err mp_complement(const mp_int * a, mp_int * b) MP_WUR;

/* right shift with sign extension */
   MP_DEPRECATED(mp_signed_rsh) mp_err mp_tc_div_2d(const mp_int * a, int b,
                                                    mp_int * c) MP_WUR;
  mp_err mp_signed_rsh(const mp_int * a, int b, mp_int * c) MP_WUR;

/* ---> Basic arithmetic <--- */

/* b = -a */
  mp_err mp_neg(const mp_int * a, mp_int * b) MP_WUR;

/* b = |a| */
  mp_err mp_abs(const mp_int * a, mp_int * b) MP_WUR;

/* compare a to b */
  mp_ord mp_cmp(const mp_int * a, const mp_int * b) MP_WUR;

/* compare |a| to |b| */
  mp_ord mp_cmp_mag(const mp_int * a, const mp_int * b) MP_WUR;

/* c = a + b */
  mp_err mp_add(const mp_int * a, const mp_int * b, mp_int * c) MP_WUR;

/* c = a - b */
  mp_err mp_sub(const mp_int * a, const mp_int * b, mp_int * c) MP_WUR;

/* c = a * b */
  mp_err mp_mul(const mp_int * a, const mp_int * b, mp_int * c) MP_WUR;

/* b = a*a  */
  mp_err mp_sqr(const mp_int * a, mp_int * b) MP_WUR;

/* a/b => cb + d == a */
  mp_err mp_div(const mp_int * a, const mp_int * b, mp_int * c,
                mp_int * d) MP_WUR;

/* c = a mod b, 0 <= c < b  */
  mp_err mp_mod(const mp_int * a, const mp_int * b, mp_int * c) MP_WUR;

/* Increment "a" by one like "a++". Changes input! */
  mp_err mp_incr(mp_int * a) MP_WUR;

/* Decrement "a" by one like "a--". Changes input! */
  mp_err mp_decr(mp_int * a) MP_WUR;

/* ---> single digit functions <--- */

/* compare against a single digit */
  mp_ord mp_cmp_d(const mp_int * a, mp_digit b) MP_WUR;

/* c = a + b */
  mp_err mp_add_d(const mp_int * a, mp_digit b, mp_int * c) MP_WUR;

/* c = a - b */
  mp_err mp_sub_d(const mp_int * a, mp_digit b, mp_int * c) MP_WUR;

/* c = a * b */
  mp_err mp_mul_d(const mp_int * a, mp_digit b, mp_int * c) MP_WUR;

/* a/b => cb + d == a */
  mp_err mp_div_d(const mp_int * a, mp_digit b, mp_int * c,
                  mp_digit * d) MP_WUR;

/* c = a mod b, 0 <= c < b  */
  mp_err mp_mod_d(const mp_int * a, mp_digit b, mp_digit * c) MP_WUR;

/* ---> number theory <--- */

/* d = a + b (mod c) */
  mp_err mp_addmod(const mp_int * a, const mp_int * b, const mp_int * c,
                   mp_int * d) MP_WUR;

/* d = a - b (mod c) */
  mp_err mp_submod(const mp_int * a, const mp_int * b, const mp_int * c,
                   mp_int * d) MP_WUR;

/* d = a * b (mod c) */
  mp_err mp_mulmod(const mp_int * a, const mp_int * b, const mp_int * c,
                   mp_int * d) MP_WUR;

/* c = a * a (mod b) */
  mp_err mp_sqrmod(const mp_int * a, const mp_int * b, mp_int * c) MP_WUR;

/* c = 1/a (mod b) */
  mp_err mp_invmod(const mp_int * a, const mp_int * b, mp_int * c) MP_WUR;

/* c = (a, b) */
  mp_err mp_gcd(const mp_int * a, const mp_int * b, mp_int * c) MP_WUR;

/* produces value such that U1*a + U2*b = U3 */
  mp_err mp_exteuclid(const mp_int * a, const mp_int * b, mp_int * U1,
                      mp_int * U2, mp_int * U3) MP_WUR;

/* c = [a, b] or (a*b)/(a, b) */
  mp_err mp_lcm(const mp_int * a, const mp_int * b, mp_int * c) MP_WUR;

/* finds one of the b'th root of a, such that |c|**b <= |a|
 *
 * returns error if a < 0 and b is even
 */
  mp_err mp_root_u32(const mp_int * a, uint32_t b, mp_int * c) MP_WUR;
   MP_DEPRECATED(mp_root_u32) mp_err mp_n_root(const mp_int * a, mp_digit b,
                                               mp_int * c) MP_WUR;
   MP_DEPRECATED(mp_root_u32) mp_err mp_n_root_ex(const mp_int * a, mp_digit b,
                                                  mp_int * c, int fast) MP_WUR;

/* special sqrt algo */
  mp_err mp_sqrt(const mp_int * arg, mp_int * ret) MP_WUR;

/* special sqrt (mod prime) */
  mp_err mp_sqrtmod_prime(const mp_int * n, const mp_int * prime,
                          mp_int * ret) MP_WUR;

/* is number a square? */
  mp_err mp_is_square(const mp_int * arg, mp_bool * ret) MP_WUR;

/* computes the jacobi c = (a | n) (or Legendre if b is prime)  */
   MP_DEPRECATED(mp_kronecker) mp_err mp_jacobi(const mp_int * a,
                                                const mp_int * n,
                                                int *c) MP_WUR;

/* computes the Kronecker symbol c = (a | p) (like jacobi() but with {a,p} in Z */
  mp_err mp_kronecker(const mp_int * a, const mp_int * p, int *c) MP_WUR;

/* used to setup the Barrett reduction for a given modulus b */
  mp_err mp_reduce_setup(mp_int * a, const mp_int * b) MP_WUR;

/* Barrett Reduction, computes a (mod b) with a precomputed value c
 *
 * Assumes that 0 < x <= m*m, note if 0 > x > -(m*m) then you can merely
 * compute the reduction as -1 * mp_reduce(mp_abs(x)) [pseudo code].
 */
  mp_err mp_reduce(mp_int * x, const mp_int * m, const mp_int * mu) MP_WUR;

/* setups the montgomery reduction */
  mp_err mp_montgomery_setup(const mp_int * n, mp_digit * rho) MP_WUR;

/* computes a = B**n mod b without division or multiplication useful for
 * normalizing numbers in a Montgomery system.
 */
  mp_err mp_montgomery_calc_normalization(mp_int * a, const mp_int * b) MP_WUR;

/* computes x/R == x (mod N) via Montgomery Reduction */
  mp_err mp_montgomery_reduce(mp_int * x, const mp_int * n,
                              mp_digit rho) MP_WUR;

/* returns 1 if a is a valid DR modulus */
  mp_bool mp_dr_is_modulus(const mp_int * a) MP_WUR;

/* sets the value of "d" required for mp_dr_reduce */
  void mp_dr_setup(const mp_int * a, mp_digit * d);

/* reduces a modulo n using the Diminished Radix method */
  mp_err mp_dr_reduce(mp_int * x, const mp_int * n, mp_digit k) MP_WUR;

/* returns true if a can be reduced with mp_reduce_2k */
  mp_bool mp_reduce_is_2k(const mp_int * a) MP_WUR;

/* determines k value for 2k reduction */
  mp_err mp_reduce_2k_setup(const mp_int * a, mp_digit * d) MP_WUR;

/* reduces a modulo b where b is of the form 2**p - k [0 <= a] */
  mp_err mp_reduce_2k(mp_int * a, const mp_int * n, mp_digit d) MP_WUR;

/* returns true if a can be reduced with mp_reduce_2k_l */
  mp_bool mp_reduce_is_2k_l(const mp_int * a) MP_WUR;

/* determines k value for 2k reduction */
  mp_err mp_reduce_2k_setup_l(const mp_int * a, mp_int * d) MP_WUR;

/* reduces a modulo b where b is of the form 2**p - k [0 <= a] */
  mp_err mp_reduce_2k_l(mp_int * a, const mp_int * n, const mp_int * d) MP_WUR;

/* Y = G**X (mod P) */
  mp_err mp_exptmod(const mp_int * G, const mp_int * X, const mp_int * P,
                    mp_int * Y) MP_WUR;

/* ---> Primes <--- */

/* number of primes */
#ifdef MP_8BIT
#define PRIVATE_MP_PRIME_TAB_SIZE 31
#else
#define PRIVATE_MP_PRIME_TAB_SIZE 256
#endif
#define PRIME_SIZE (MP_DEPRECATED_PRAGMA("PRIME_SIZE has been made internal") PRIVATE_MP_PRIME_TAB_SIZE)

/* table of first PRIME_SIZE primes */
   MP_DEPRECATED(internal) extern const mp_digit
      ltm_prime_tab[PRIVATE_MP_PRIME_TAB_SIZE];

/* result=1 if a is divisible by one of the first PRIME_SIZE primes */
   MP_DEPRECATED(mp_prime_is_prime) mp_err mp_prime_is_divisible(const mp_int *
                                                                 a,
                                                                 mp_bool *
                                                                 result) MP_WUR;

/* performs one Fermat test of "a" using base "b".
 * Sets result to 0 if composite or 1 if probable prime
 */
  mp_err mp_prime_fermat(const mp_int * a, const mp_int * b,
                         mp_bool * result) MP_WUR;

/* performs one Miller-Rabin test of "a" using base "b".
 * Sets result to 0 if composite or 1 if probable prime
 */
  mp_err mp_prime_miller_rabin(const mp_int * a, const mp_int * b,
                               mp_bool * result) MP_WUR;

/* This gives [for a given bit size] the number of trials required
 * such that Miller-Rabin gives a prob of failure lower than 2^-96
 */
  int mp_prime_rabin_miller_trials(int size) MP_WUR;

/* performs one strong Lucas-Selfridge test of "a".
 * Sets result to 0 if composite or 1 if probable prime
 */
  mp_err mp_prime_strong_lucas_selfridge(const mp_int * a,
                                         mp_bool * result) MP_WUR;

/* performs one Frobenius test of "a" as described by Paul Underwood.
 * Sets result to 0 if composite or 1 if probable prime
 */
  mp_err mp_prime_frobenius_underwood(const mp_int * N,
                                      mp_bool * result) MP_WUR;

/* performs t random rounds of Miller-Rabin on "a" additional to
 * bases 2 and 3.  Also performs an initial sieve of trial
 * division.  Determines if "a" is prime with probability
 * of error no more than (1/4)**t.
 * Both a strong Lucas-Selfridge to complete the BPSW test
 * and a separate Frobenius test are available at compile time.
 * With t<0 a deterministic test is run for primes up to
 * 318665857834031151167461. With t<13 (abs(t)-13) additional
 * tests with sequential small primes are run starting at 43.
 * Is Fips 186.4 compliant if called with t as computed by
 * mp_prime_rabin_miller_trials();
 *
 * Sets result to 1 if probably prime, 0 otherwise
 */
  mp_err mp_prime_is_prime(const mp_int * a, int t, mp_bool * result) MP_WUR;

/* finds the next prime after the number "a" using "t" trials
 * of Miller-Rabin.
 *
 * bbs_style = 1 means the prime must be congruent to 3 mod 4
 */
  mp_err mp_prime_next_prime(mp_int * a, int t, int bbs_style) MP_WUR;

/* makes a truly random prime of a given size (bytes),
 * call with bbs = 1 if you want it to be congruent to 3 mod 4
 *
 * You have to supply a callback which fills in a buffer with random bytes.  "dat" is a parameter you can
 * have passed to the callback (e.g. a state or something).  This function doesn't use "dat" itself
 * so it can be NULL
 *
 * The prime generated will be larger than 2^(8*size).
 */
#define mp_prime_random(a, t, size, bbs, cb, dat) (MP_DEPRECATED_PRAGMA("mp_prime_random has been deprecated, use mp_prime_rand instead") mp_prime_random_ex(a, t, ((size) * 8) + 1, (bbs==1)?MP_PRIME_BBS:0, cb, dat))

/* makes a truly random prime of a given size (bits),
 *
 * Flags are as follows:
 *
 *   MP_PRIME_BBS      - make prime congruent to 3 mod 4
 *   MP_PRIME_SAFE     - make sure (p-1)/2 is prime as well (implies MP_PRIME_BBS)
 *   MP_PRIME_2MSB_ON  - make the 2nd highest bit one
 *
 * You have to supply a callback which fills in a buffer with random bytes.  "dat" is a parameter you can
 * have passed to the callback (e.g. a state or something).  This function doesn't use "dat" itself
 * so it can be NULL
 *
 */
   MP_DEPRECATED(mp_prime_rand) mp_err mp_prime_random_ex(mp_int * a, int t,
                                                          int size, int flags,
                                                          private_mp_prime_callback
                                                          cb, void *dat) MP_WUR;
  mp_err mp_prime_rand(mp_int * a, int t, int size, int flags) MP_WUR;

/* Integer logarithm to integer base */
  mp_err mp_log_u32(const mp_int * a, uint32_t base, uint32_t * c) MP_WUR;

/* c = a**b */
  mp_err mp_expt_u32(const mp_int * a, uint32_t b, mp_int * c) MP_WUR;
   MP_DEPRECATED(mp_expt_u32) mp_err mp_expt_d(const mp_int * a, mp_digit b,
                                               mp_int * c) MP_WUR;
   MP_DEPRECATED(mp_expt_u32) mp_err mp_expt_d_ex(const mp_int * a, mp_digit b,
                                                  mp_int * c, int fast) MP_WUR;

/* ---> radix conversion <--- */
  int mp_count_bits(const mp_int * a) MP_WUR;

   MP_DEPRECATED(mp_ubin_size) int mp_unsigned_bin_size(const mp_int *
                                                        a) MP_WUR;
   MP_DEPRECATED(mp_from_ubin) mp_err mp_read_unsigned_bin(mp_int * a,
                                                           const unsigned char
                                                           *b, int c) MP_WUR;
   MP_DEPRECATED(mp_to_ubin) mp_err mp_to_unsigned_bin(const mp_int * a,
                                                       unsigned char *b) MP_WUR;
   MP_DEPRECATED(mp_to_ubin) mp_err mp_to_unsigned_bin_n(const mp_int * a,
                                                         unsigned char *b,
                                                         unsigned long *outlen)
      MP_WUR;

   MP_DEPRECATED(mp_sbin_size) int mp_signed_bin_size(const mp_int * a) MP_WUR;
   MP_DEPRECATED(mp_from_sbin) mp_err mp_read_signed_bin(mp_int * a,
                                                         const unsigned char *b,
                                                         int c) MP_WUR;
   MP_DEPRECATED(mp_to_sbin) mp_err mp_to_signed_bin(const mp_int * a,
                                                     unsigned char *b) MP_WUR;
   MP_DEPRECATED(mp_to_sbin) mp_err mp_to_signed_bin_n(const mp_int * a,
                                                       unsigned char *b,
                                                       unsigned long *outlen)
      MP_WUR;

  size_t mp_ubin_size(const mp_int * a) MP_WUR;
  mp_err mp_from_ubin(mp_int * a, const unsigned char *buf, size_t size) MP_WUR;
  mp_err mp_to_ubin(const mp_int * a, unsigned char *buf, size_t maxlen,
                    size_t *written) MP_WUR;

  size_t mp_sbin_size(const mp_int * a) MP_WUR;
  mp_err mp_from_sbin(mp_int * a, const unsigned char *buf, size_t size) MP_WUR;
  mp_err mp_to_sbin(const mp_int * a, unsigned char *buf, size_t maxlen,
                    size_t *written) MP_WUR;

  mp_err mp_read_radix(mp_int * a, const char *str, int radix) MP_WUR;
   MP_DEPRECATED(mp_to_radix) mp_err mp_toradix(const mp_int * a, char *str,
                                                int radix) MP_WUR;
   MP_DEPRECATED(mp_to_radix) mp_err mp_toradix_n(const mp_int * a, char *str,
                                                  int radix, int maxlen) MP_WUR;
  mp_err mp_to_radix(const mp_int * a, char *str, size_t maxlen,
                     size_t *written, int radix) MP_WUR;
  mp_err mp_radix_size(const mp_int * a, int radix, int *size) MP_WUR;

#ifndef MP_NO_FILE
  mp_err mp_fread(mp_int * a, int radix, FILE * stream) MP_WUR;
  mp_err mp_fwrite(const mp_int * a, int radix, FILE * stream) MP_WUR;
#endif

#define mp_read_raw(mp, str, len) (MP_DEPRECATED_PRAGMA("replaced by mp_read_signed_bin") mp_read_signed_bin((mp), (str), (len)))
#define mp_raw_size(mp)           (MP_DEPRECATED_PRAGMA("replaced by mp_signed_bin_size") mp_signed_bin_size(mp))
#define mp_toraw(mp, str)         (MP_DEPRECATED_PRAGMA("replaced by mp_to_signed_bin") mp_to_signed_bin((mp), (str)))
#define mp_read_mag(mp, str, len) (MP_DEPRECATED_PRAGMA("replaced by mp_read_unsigned_bin") mp_read_unsigned_bin((mp), (str), (len))
#define mp_mag_size(mp)           (MP_DEPRECATED_PRAGMA("replaced by mp_unsigned_bin_size") mp_unsigned_bin_size(mp))
#define mp_tomag(mp, str)         (MP_DEPRECATED_PRAGMA("replaced by mp_to_unsigned_bin") mp_to_unsigned_bin((mp), (str)))

#define mp_tobinary(M, S)  (MP_DEPRECATED_PRAGMA("replaced by mp_to_binary")  mp_toradix((M), (S), 2))
#define mp_tooctal(M, S)   (MP_DEPRECATED_PRAGMA("replaced by mp_to_octal")   mp_toradix((M), (S), 8))
#define mp_todecimal(M, S) (MP_DEPRECATED_PRAGMA("replaced by mp_to_decimal") mp_toradix((M), (S), 10))
#define mp_tohex(M, S)     (MP_DEPRECATED_PRAGMA("replaced by mp_to_hex")     mp_toradix((M), (S), 16))

#define mp_to_binary(M, S, N)  mp_to_radix((M), (S), (N), NULL, 2)
#define mp_to_octal(M, S, N)   mp_to_radix((M), (S), (N), NULL, 8)
#define mp_to_decimal(M, S, N) mp_to_radix((M), (S), (N), NULL, 10)
#define mp_to_hex(M, S, N)     mp_to_radix((M), (S), (N), NULL, 16)

#ifdef __cplusplus
}
#endif
#endif
