diff options
Diffstat (limited to 'src/ltm/bn_s_mp_toom_sqr.c')
| -rw-r--r-- | src/ltm/bn_s_mp_toom_sqr.c | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/src/ltm/bn_s_mp_toom_sqr.c b/src/ltm/bn_s_mp_toom_sqr.c deleted file mode 100644 index a6bf85e9..00000000 --- a/src/ltm/bn_s_mp_toom_sqr.c +++ /dev/null @@ -1,194 +0,0 @@ -#include "tommath_private.h" -#ifdef BN_S_MP_TOOM_SQR_C -/* LibTomMath, multiple-precision integer library -- Tom St Denis */ -/* SPDX-License-Identifier: Unlicense */ - -/* squaring using Toom-Cook 3-way algorithm */ - -/* - This file contains code from J. Arndt's book "Matters Computational" - and the accompanying FXT-library with permission of the author. -*/ - -/* squaring using Toom-Cook 3-way algorithm */ -/* - Setup and interpolation from algorithm SQR_3 in - - Chung, Jaewook, and M. Anwar Hasan. "Asymmetric squaring formulae." - 18th IEEE Symposium on Computer Arithmetic (ARITH'07). IEEE, 2007. - -*/ -mp_err s_mp_toom_sqr(const mp_int *a, mp_int *b) -{ - mp_int S0, a0, a1, a2; - mp_digit *tmpa, *tmpc; - mp_err err, B, count; - - - /* init temps */ - if ((err = mp_init(&S0)) != MP_OKAY) { - return err; - } - - /* B */ - B = a->used / 3; - - /** a = a2 * x^2 + a1 * x + a0; */ - if ((err = mp_init_size(&a0, B)) != MP_OKAY) { - goto LTM_ERRa0; - } - a0.used = B; - if ((err = mp_init_size(&a1, B)) != MP_OKAY) { - goto LTM_ERRa1; - } - a1.used = B; - if ((err = mp_init_size(&a2, B + (a->used - (3 * B)))) != MP_OKAY) { - goto LTM_ERRa2; - } - tmpa = a->dp; - tmpc = a0.dp; - for (count = 0; count < B; count++) { - *tmpc++ = *tmpa++; - } - tmpc = a1.dp; - for (; count < (2 * B); count++) { - *tmpc++ = *tmpa++; - } - tmpc = a2.dp; - for (; count < a->used; count++) { - *tmpc++ = *tmpa++; - a2.used++; - } - mp_clamp(&a0); - mp_clamp(&a1); - - /** S0 = a0^2; */ - if ((err = mp_sqr(&a0, &S0)) != MP_OKAY) { - goto LTM_ERR; - } - /** \\S1 = (a2 + a1 + a0)^2 */ - /** \\S2 = (a2 - a1 + a0)^2 */ - /** \\S1 = a0 + a2; */ - /** a0 = a0 + a2; */ - if ((err = mp_add(&a0, &a2, &a0)) != MP_OKAY) { - goto LTM_ERR; - } - /** \\S2 = S1 - a1; */ - /** b = a0 - a1; */ - if ((err = mp_sub(&a0, &a1, b)) != MP_OKAY) { - goto LTM_ERR; - } - /** \\S1 = S1 + a1; */ - /** a0 = a0 + a1; */ - if ((err = mp_add(&a0, &a1, &a0)) != MP_OKAY) { - goto LTM_ERR; - } - /** \\S1 = S1^2; */ - /** a0 = a0^2; */ - if ((err = mp_sqr(&a0, &a0)) != MP_OKAY) { - goto LTM_ERR; - } - /** \\S2 = S2^2; */ - /** b = b^2; */ - if ((err = mp_sqr(b, b)) != MP_OKAY) { - goto LTM_ERR; - } - - /** \\ S3 = 2 * a1 * a2 */ - /** \\S3 = a1 * a2; */ - /** a1 = a1 * a2; */ - if ((err = mp_mul(&a1, &a2, &a1)) != MP_OKAY) { - goto LTM_ERR; - } - /** \\S3 = S3 << 1; */ - /** a1 = a1 << 1; */ - if ((err = mp_mul_2(&a1, &a1)) != MP_OKAY) { - goto LTM_ERR; - } - - /** \\S4 = a2^2; */ - /** a2 = a2^2; */ - if ((err = mp_sqr(&a2, &a2)) != MP_OKAY) { - goto LTM_ERR; - } - - /** \\ tmp = (S1 + S2)/2 */ - /** \\tmp = S1 + S2; */ - /** b = a0 + b; */ - if ((err = mp_add(&a0, b, b)) != MP_OKAY) { - goto LTM_ERR; - } - /** \\tmp = tmp >> 1; */ - /** b = b >> 1; */ - if ((err = mp_div_2(b, b)) != MP_OKAY) { - goto LTM_ERR; - } - - /** \\ S1 = S1 - tmp - S3 */ - /** \\S1 = S1 - tmp; */ - /** a0 = a0 - b; */ - if ((err = mp_sub(&a0, b, &a0)) != MP_OKAY) { - goto LTM_ERR; - } - /** \\S1 = S1 - S3; */ - /** a0 = a0 - a1; */ - if ((err = mp_sub(&a0, &a1, &a0)) != MP_OKAY) { - goto LTM_ERR; - } - - /** \\S2 = tmp - S4 -S0 */ - /** \\S2 = tmp - S4; */ - /** b = b - a2; */ - if ((err = mp_sub(b, &a2, b)) != MP_OKAY) { - goto LTM_ERR; - } - /** \\S2 = S2 - S0; */ - /** b = b - S0; */ - if ((err = mp_sub(b, &S0, b)) != MP_OKAY) { - goto LTM_ERR; - } - - - /** \\P = S4*x^4 + S3*x^3 + S2*x^2 + S1*x + S0; */ - /** P = a2*x^4 + a1*x^3 + b*x^2 + a0*x + S0; */ - - if ((err = mp_lshd(&a2, 4 * B)) != MP_OKAY) { - goto LTM_ERR; - } - if ((err = mp_lshd(&a1, 3 * B)) != MP_OKAY) { - goto LTM_ERR; - } - if ((err = mp_lshd(b, 2 * B)) != MP_OKAY) { - goto LTM_ERR; - } - if ((err = mp_lshd(&a0, 1 * B)) != MP_OKAY) { - goto LTM_ERR; - } - if ((err = mp_add(&a2, &a1, &a2)) != MP_OKAY) { - goto LTM_ERR; - } - if ((err = mp_add(&a2, b, b)) != MP_OKAY) { - goto LTM_ERR; - } - if ((err = mp_add(b, &a0, b)) != MP_OKAY) { - goto LTM_ERR; - } - if ((err = mp_add(b, &S0, b)) != MP_OKAY) { - goto LTM_ERR; - } - /** a^2 - P */ - - -LTM_ERR: - mp_clear(&a2); -LTM_ERRa2: - mp_clear(&a1); -LTM_ERRa1: - mp_clear(&a0); -LTM_ERRa0: - mp_clear(&S0); - - return err; -} - -#endif |