Mercurial > dropbear
annotate libtommath/bn_mp_montgomery_calc_normalization.c @ 1723:5386011b740d
Disable toom and karatsuba for new libtommath
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 18 Jun 2020 19:12:07 +0800 |
parents | 1051e4eea25a |
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update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_MONTGOMERY_CALC_NORMALIZATION_C |
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */ |
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4 /* SPDX-License-Identifier: Unlicense */ |
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5 |
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6 /* |
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7 * shifts with subtractions when the result is greater than b. |
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8 * |
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9 * The method is slightly modified to shift B unconditionally upto just under |
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10 * the leading bit of b. This saves alot of multiple precision shifting. |
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11 */ |
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12 mp_err mp_montgomery_calc_normalization(mp_int *a, const mp_int *b) |
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13 { |
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14 int x, bits; |
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15 mp_err err; |
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16 |
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17 /* how many bits of last digit does b use */ |
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18 bits = mp_count_bits(b) % MP_DIGIT_BIT; |
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19 |
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20 if (b->used > 1) { |
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21 if ((err = mp_2expt(a, ((b->used - 1) * MP_DIGIT_BIT) + bits - 1)) != MP_OKAY) { |
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22 return err; |
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23 } |
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24 } else { |
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25 mp_set(a, 1uL); |
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26 bits = 1; |
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27 } |
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28 |
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29 |
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30 /* now compute C = A * B mod b */ |
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31 for (x = bits - 1; x < (int)MP_DIGIT_BIT; x++) { |
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32 if ((err = mp_mul_2(a, a)) != MP_OKAY) { |
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33 return err; |
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34 } |
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35 if (mp_cmp_mag(a, b) != MP_LT) { |
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36 if ((err = s_mp_sub(a, b, a)) != MP_OKAY) { |
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37 return err; |
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38 } |
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parents:
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39 } |
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40 } |
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41 |
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42 return MP_OKAY; |
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43 } |
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44 #endif |