Mercurial > dropbear
annotate libtommath/bn_mp_or.c @ 1764:a339b1c4b9f2
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author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 26 Oct 2020 22:51:44 +0800 |
parents | 1051e4eea25a |
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_OR_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 /* two complement or */ |
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7 mp_err mp_or(const mp_int *a, const mp_int *b, mp_int *c) |
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8 { |
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9 int used = MP_MAX(a->used, b->used) + 1, i; |
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10 mp_err err; |
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11 mp_digit ac = 1, bc = 1, cc = 1; |
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12 mp_sign csign = ((a->sign == MP_NEG) || (b->sign == MP_NEG)) ? MP_NEG : MP_ZPOS; |
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13 |
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14 if (c->alloc < used) { |
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15 if ((err = mp_grow(c, used)) != MP_OKAY) { |
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16 return err; |
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17 } |
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18 } |
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19 |
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20 for (i = 0; i < used; i++) { |
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21 mp_digit x, y; |
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22 |
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23 /* convert to two complement if negative */ |
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24 if (a->sign == MP_NEG) { |
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25 ac += (i >= a->used) ? MP_MASK : (~a->dp[i] & MP_MASK); |
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26 x = ac & MP_MASK; |
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27 ac >>= MP_DIGIT_BIT; |
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28 } else { |
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29 x = (i >= a->used) ? 0uL : a->dp[i]; |
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30 } |
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31 |
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32 /* convert to two complement if negative */ |
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33 if (b->sign == MP_NEG) { |
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34 bc += (i >= b->used) ? MP_MASK : (~b->dp[i] & MP_MASK); |
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35 y = bc & MP_MASK; |
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36 bc >>= MP_DIGIT_BIT; |
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37 } else { |
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38 y = (i >= b->used) ? 0uL : b->dp[i]; |
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39 } |
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40 |
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41 c->dp[i] = x | y; |
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42 |
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43 /* convert to to sign-magnitude if negative */ |
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44 if (csign == MP_NEG) { |
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45 cc += ~c->dp[i] & MP_MASK; |
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46 c->dp[i] = cc & MP_MASK; |
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47 cc >>= MP_DIGIT_BIT; |
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48 } |
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49 } |
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50 |
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51 c->used = used; |
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52 c->sign = csign; |
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53 mp_clamp(c); |
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54 return MP_OKAY; |
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55 } |
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56 #endif |