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annotate libtommath/bn_mp_montgomery_reduce.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_MONTGOMERY_REDUCE_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 /* computes xR**-1 == x (mod N) via Montgomery Reduction */
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7 mp_err mp_montgomery_reduce(mp_int *x, const mp_int *n, mp_digit rho)
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8 {
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9 int ix, digs;
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10 mp_err err;
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11 mp_digit mu;
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12
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13 /* can the fast reduction [comba] method be used?
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14 *
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15 * Note that unlike in mul you're safely allowed *less*
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16 * than the available columns [255 per default] since carries
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17 * are fixed up in the inner loop.
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18 */
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19 digs = (n->used * 2) + 1;
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20 if ((digs < MP_WARRAY) &&
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21 (x->used <= MP_WARRAY) &&
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22 (n->used < MP_MAXFAST)) {
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23 return s_mp_montgomery_reduce_fast(x, n, rho);
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24 }
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26 /* grow the input as required */
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27 if (x->alloc < digs) {
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28 if ((err = mp_grow(x, digs)) != MP_OKAY) {
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29 return err;
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30 }
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31 }
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32 x->used = digs;
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34 for (ix = 0; ix < n->used; ix++) {
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35 /* mu = ai * rho mod b
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36 *
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37 * The value of rho must be precalculated via
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38 * montgomery_setup() such that
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39 * it equals -1/n0 mod b this allows the
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40 * following inner loop to reduce the
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41 * input one digit at a time
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42 */
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43 mu = (mp_digit)(((mp_word)x->dp[ix] * (mp_word)rho) & MP_MASK);
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45 /* a = a + mu * m * b**i */
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46 {
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47 int iy;
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48 mp_digit *tmpn, *tmpx, u;
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49 mp_word r;
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51 /* alias for digits of the modulus */
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52 tmpn = n->dp;
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54 /* alias for the digits of x [the input] */
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55 tmpx = x->dp + ix;
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57 /* set the carry to zero */
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58 u = 0;
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59
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60 /* Multiply and add in place */
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61 for (iy = 0; iy < n->used; iy++) {
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62 /* compute product and sum */
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63 r = ((mp_word)mu * (mp_word)*tmpn++) +
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64 (mp_word)u + (mp_word)*tmpx;
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65
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66 /* get carry */
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67 u = (mp_digit)(r >> (mp_word)MP_DIGIT_BIT);
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69 /* fix digit */
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70 *tmpx++ = (mp_digit)(r & (mp_word)MP_MASK);
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71 }
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72 /* At this point the ix'th digit of x should be zero */
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75 /* propagate carries upwards as required*/
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76 while (u != 0u) {
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77 *tmpx += u;
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78 u = *tmpx >> MP_DIGIT_BIT;
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79 *tmpx++ &= MP_MASK;
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80 }
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81 }
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82 }
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83
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84 /* at this point the n.used'th least
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85 * significant digits of x are all zero
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86 * which means we can shift x to the
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87 * right by n.used digits and the
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88 * residue is unchanged.
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89 */
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90
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91 /* x = x/b**n.used */
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92 mp_clamp(x);
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93 mp_rshd(x, n->used);
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94
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95 /* if x >= n then x = x - n */
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96 if (mp_cmp_mag(x, n) != MP_LT) {
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97 return s_mp_sub(x, n, x);
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98 }
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99
1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
100 return MP_OKAY;
284
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 #endif