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annotate libtommath/bn_s_mp_sqr.c @ 1930:299f4f19ba19

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Add /usr/sbin and /sbin to default root PATH When dropbear is used in a very restricted environment (such as in a initrd), the default user shell is often also very restricted and doesn't take care of setting the PATH so the user ends up with the PATH set by dropbear. Unfortunately, dropbear always sets "/usr/bin:/bin" as default PATH even for the root user which should have /usr/sbin and /sbin too. For a concrete instance of this problem, see the "Remote Unlocking" section in this tutorial: https://paxswill.com/blog/2013/11/04/encrypted-raspberry-pi/ It speaks of a bug in the initramfs script because it's written "blkid" instead of "/sbin/blkid"... this is just because the scripts from the initramfs do not expect to have a PATH without the sbin directories and because dropbear is not setting the PATH appropriately for the root user. I'm thus suggesting to use the attached patch to fix this misbehaviour (I did not test it, but it's easy enough). It might seem anecdotic but multiple Kali users have been bitten by this. From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
author Raphael Hertzog <hertzog@debian.org>
date Mon, 09 Jul 2018 16:27:53 +0200
parents 1051e4eea25a
children
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1 #include "tommath_private.h"
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2 #ifdef BN_S_MP_SQR_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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6 /* low level squaring, b = a*a, HAC pp.596-597, Algorithm 14.16 */
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7 mp_err s_mp_sqr(const mp_int *a, mp_int *b)
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8 {
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9 mp_int t;
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10 int ix, iy, pa;
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11 mp_err err;
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12 mp_word r;
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13 mp_digit u, tmpx, *tmpt;
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14
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15 pa = a->used;
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16 if ((err = mp_init_size(&t, (2 * pa) + 1)) != MP_OKAY) {
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17 return err;
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18 }
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20 /* default used is maximum possible size */
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21 t.used = (2 * pa) + 1;
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23 for (ix = 0; ix < pa; ix++) {
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24 /* first calculate the digit at 2*ix */
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25 /* calculate double precision result */
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26 r = (mp_word)t.dp[2*ix] +
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27 ((mp_word)a->dp[ix] * (mp_word)a->dp[ix]);
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29 /* store lower part in result */
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30 t.dp[ix+ix] = (mp_digit)(r & (mp_word)MP_MASK);
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32 /* get the carry */
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33 u = (mp_digit)(r >> (mp_word)MP_DIGIT_BIT);
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35 /* left hand side of A[ix] * A[iy] */
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36 tmpx = a->dp[ix];
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38 /* alias for where to store the results */
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39 tmpt = t.dp + ((2 * ix) + 1);
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41 for (iy = ix + 1; iy < pa; iy++) {
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42 /* first calculate the product */
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43 r = (mp_word)tmpx * (mp_word)a->dp[iy];
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45 /* now calculate the double precision result, note we use
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46 * addition instead of *2 since it's easier to optimize
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47 */
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48 r = (mp_word)*tmpt + r + r + (mp_word)u;
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50 /* store lower part */
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51 *tmpt++ = (mp_digit)(r & (mp_word)MP_MASK);
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53 /* get carry */
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54 u = (mp_digit)(r >> (mp_word)MP_DIGIT_BIT);
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55 }
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56 /* propagate upwards */
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57 while (u != 0uL) {
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58 r = (mp_word)*tmpt + (mp_word)u;
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59 *tmpt++ = (mp_digit)(r & (mp_word)MP_MASK);
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60 u = (mp_digit)(r >> (mp_word)MP_DIGIT_BIT);
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61 }
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62 }
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64 mp_clamp(&t);
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65 mp_exch(&t, b);
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66 mp_clear(&t);
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67 return MP_OKAY;
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68 }
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69 #endif