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Reduce integrated LibTomMath size by dropping negative exponent support

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Current uses do not require support for negative exponent in exptmod, so we
can save about 1.5 kB in leaving out invmod.
This commit is contained in:
Jouni Malinen 2008-06-04 11:26:52 +03:00
parent a8e16edc86
commit 0527710dd3
1 changed files with 17 additions and 2 deletions
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19
src/tls/libtommath.c
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@ -30,6 +30,9 @@
#define BN_S_MP_MUL_HIGH_DIGS_C /* Note: #undef in tommath_superclass.h; this #define BN_S_MP_MUL_HIGH_DIGS_C /* Note: #undef in tommath_superclass.h; this
* would require other than mp_reduce */ * would require other than mp_reduce */
/* Current uses do not require support for negative exponent in exptmod, so we
* can save about 1.5 kB in leaving out invmod. */
#define LTM_NO_NEG_EXP
/* from tommath.h */ /* from tommath.h */
@ -122,16 +125,18 @@ static int mp_mod_2d(mp_int * a, int b, mp_int * c);
static int mp_div_2d(mp_int * a, int b, mp_int * c, mp_int * d); static int mp_div_2d(mp_int * a, int b, mp_int * c, mp_int * d);
static int mp_init_copy(mp_int * a, mp_int * b); static int mp_init_copy(mp_int * a, mp_int * b);
static int mp_mul_2d(mp_int * a, int b, mp_int * c); static int mp_mul_2d(mp_int * a, int b, mp_int * c);
#ifndef LTM_NO_NEG_EXP
static int mp_div_2(mp_int * a, mp_int * b); static int mp_div_2(mp_int * a, mp_int * b);
static int mp_invmod(mp_int * a, mp_int * b, mp_int * c);
static int mp_invmod_slow(mp_int * a, mp_int * b, mp_int * c);
#endif /* LTM_NO_NEG_EXP */
static int mp_copy(mp_int * a, mp_int * b); static int mp_copy(mp_int * a, mp_int * b);
static int mp_count_bits(mp_int * a); static int mp_count_bits(mp_int * a);
static int mp_div(mp_int * a, mp_int * b, mp_int * c, mp_int * d); static int mp_div(mp_int * a, mp_int * b, mp_int * c, mp_int * d);
static int mp_mod(mp_int * a, mp_int * b, mp_int * c); static int mp_mod(mp_int * a, mp_int * b, mp_int * c);
static int mp_grow(mp_int * a, int size); static int mp_grow(mp_int * a, int size);
static int mp_cmp_mag(mp_int * a, mp_int * b); static int mp_cmp_mag(mp_int * a, mp_int * b);
static int mp_invmod(mp_int * a, mp_int * b, mp_int * c);
static int mp_abs(mp_int * a, mp_int * b); static int mp_abs(mp_int * a, mp_int * b);
static int mp_invmod_slow(mp_int * a, mp_int * b, mp_int * c);
static int mp_sqr(mp_int * a, mp_int * b); static int mp_sqr(mp_int * a, mp_int * b);
static int mp_reduce_2k_l(mp_int *a, mp_int *n, mp_int *d); static int mp_reduce_2k_l(mp_int *a, mp_int *n, mp_int *d);
static int mp_reduce_2k_setup_l(mp_int *a, mp_int *d); static int mp_reduce_2k_setup_l(mp_int *a, mp_int *d);
@ -546,6 +551,9 @@ static int mp_exptmod (mp_int * G, mp_int * X, mp_int * P, mp_int * Y)
/* if exponent X is negative we have to recurse */ /* if exponent X is negative we have to recurse */
if (X->sign == MP_NEG) { if (X->sign == MP_NEG) {
#ifdef LTM_NO_NEG_EXP
return MP_VAL;
#else /* LTM_NO_NEG_EXP */
#ifdef BN_MP_INVMOD_C #ifdef BN_MP_INVMOD_C
mp_int tmpG, tmpX; mp_int tmpG, tmpX;
int err; int err;
@ -578,6 +586,7 @@ static int mp_exptmod (mp_int * G, mp_int * X, mp_int * P, mp_int * Y)
/* no invmod */ /* no invmod */
return MP_VAL; return MP_VAL;
#endif #endif
#endif /* LTM_NO_NEG_EXP */
} }
/* modified diminished radix reduction */ /* modified diminished radix reduction */
@ -668,6 +677,7 @@ static int mp_cmp_d(mp_int * a, mp_digit b)
} }
#ifndef LTM_NO_NEG_EXP
/* hac 14.61, pp608 */ /* hac 14.61, pp608 */
static int mp_invmod (mp_int * a, mp_int * b, mp_int * c) static int mp_invmod (mp_int * a, mp_int * b, mp_int * c)
{ {
@ -694,6 +704,7 @@ static int mp_invmod (mp_int * a, mp_int * b, mp_int * c)
#endif #endif
return MP_VAL; return MP_VAL;
} }
#endif /* LTM_NO_NEG_EXP */
/* get the size for an unsigned equivalent */ /* get the size for an unsigned equivalent */
@ -704,6 +715,7 @@ static int mp_unsigned_bin_size (mp_int * a)
} }
#ifndef LTM_NO_NEG_EXP
/* hac 14.61, pp608 */ /* hac 14.61, pp608 */
static int mp_invmod_slow (mp_int * a, mp_int * b, mp_int * c) static int mp_invmod_slow (mp_int * a, mp_int * b, mp_int * c)
{ {
@ -857,6 +869,7 @@ top:
LBL_ERR:mp_clear_multi (&x, &y, &u, &v, &A, &B, &C, &D, NULL); LBL_ERR:mp_clear_multi (&x, &y, &u, &v, &A, &B, &C, &D, NULL);
return res; return res;
} }
#endif /* LTM_NO_NEG_EXP */
/* compare maginitude of two ints (unsigned) */ /* compare maginitude of two ints (unsigned) */
@ -1264,6 +1277,7 @@ static void mp_set (mp_int * a, mp_digit b)
} }
#ifndef LTM_NO_NEG_EXP
/* b = a/2 */ /* b = a/2 */
static int mp_div_2(mp_int * a, mp_int * b) static int mp_div_2(mp_int * a, mp_int * b)
{ {
@ -1310,6 +1324,7 @@ static int mp_div_2(mp_int * a, mp_int * b)
mp_clamp (b); mp_clamp (b);
return MP_OKAY; return MP_OKAY;
} }
#endif /* LTM_NO_NEG_EXP */
/* shift left by a certain bit count */ /* shift left by a certain bit count */