Mercurial > dropbear
annotate libtommath/bn_mp_gcd.c @ 994:5c5ade336926
Prefer stronger algorithms in algorithm negotiation.
Prefer diffie-hellman-group14-sha1 (2048 bit) over
diffie-hellman-group1-sha1 (1024 bit).
Due to meet-in-the-middle attacks the effective key length of
three key 3DES is 112 bits. AES is stronger and faster then 3DES.
Prefer to delay the start of compression until after authentication
has completed. This avoids exposing compression code to attacks
from unauthenticated users.
(github pull request #9)
author | Fedor Brunner <fedor.brunner@azet.sk> |
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date | Fri, 23 Jan 2015 23:00:25 +0800 |
parents | 5ff8218bcee9 |
children | 60fc6476e044 |
rev | line source |
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1 #include <tommath.h> |
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2 #ifdef BN_MP_GCD_C |
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
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4 * |
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5 * LibTomMath is a library that provides multiple-precision |
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6 * integer arithmetic as well as number theoretic functionality. |
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7 * |
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8 * The library was designed directly after the MPI library by |
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9 * Michael Fromberger but has been written from scratch with |
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10 * additional optimizations in place. |
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11 * |
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12 * The library is free for all purposes without any express |
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13 * guarantee it works. |
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14 * |
389
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.com |
284
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16 */ |
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17 |
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18 /* Greatest Common Divisor using the binary method */ |
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19 int mp_gcd (mp_int * a, mp_int * b, mp_int * c) |
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20 { |
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21 mp_int u, v; |
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22 int k, u_lsb, v_lsb, res; |
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23 |
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24 /* either zero than gcd is the largest */ |
389
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25 if (mp_iszero (a) == MP_YES) { |
284
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26 return mp_abs (b, c); |
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27 } |
389
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28 if (mp_iszero (b) == MP_YES) { |
284
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29 return mp_abs (a, c); |
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30 } |
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31 |
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32 /* get copies of a and b we can modify */ |
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33 if ((res = mp_init_copy (&u, a)) != MP_OKAY) { |
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34 return res; |
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35 } |
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36 |
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37 if ((res = mp_init_copy (&v, b)) != MP_OKAY) { |
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38 goto LBL_U; |
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39 } |
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40 |
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41 /* must be positive for the remainder of the algorithm */ |
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42 u.sign = v.sign = MP_ZPOS; |
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43 |
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44 /* B1. Find the common power of two for u and v */ |
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45 u_lsb = mp_cnt_lsb(&u); |
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46 v_lsb = mp_cnt_lsb(&v); |
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47 k = MIN(u_lsb, v_lsb); |
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48 |
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49 if (k > 0) { |
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50 /* divide the power of two out */ |
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51 if ((res = mp_div_2d(&u, k, &u, NULL)) != MP_OKAY) { |
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52 goto LBL_V; |
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53 } |
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54 |
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55 if ((res = mp_div_2d(&v, k, &v, NULL)) != MP_OKAY) { |
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56 goto LBL_V; |
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57 } |
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58 } |
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59 |
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60 /* divide any remaining factors of two out */ |
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61 if (u_lsb != k) { |
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62 if ((res = mp_div_2d(&u, u_lsb - k, &u, NULL)) != MP_OKAY) { |
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63 goto LBL_V; |
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64 } |
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65 } |
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66 |
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67 if (v_lsb != k) { |
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68 if ((res = mp_div_2d(&v, v_lsb - k, &v, NULL)) != MP_OKAY) { |
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69 goto LBL_V; |
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70 } |
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71 } |
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72 |
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73 while (mp_iszero(&v) == 0) { |
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74 /* make sure v is the largest */ |
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75 if (mp_cmp_mag(&u, &v) == MP_GT) { |
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76 /* swap u and v to make sure v is >= u */ |
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77 mp_exch(&u, &v); |
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78 } |
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79 |
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80 /* subtract smallest from largest */ |
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81 if ((res = s_mp_sub(&v, &u, &v)) != MP_OKAY) { |
eed26cff980b
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Matt Johnston <matt@ucc.asn.au>
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82 goto LBL_V; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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83 } |
eed26cff980b
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parents:
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84 |
eed26cff980b
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Matt Johnston <matt@ucc.asn.au>
parents:
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85 /* Divide out all factors of two */ |
eed26cff980b
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Matt Johnston <matt@ucc.asn.au>
parents:
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86 if ((res = mp_div_2d(&v, mp_cnt_lsb(&v), &v, NULL)) != MP_OKAY) { |
eed26cff980b
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Matt Johnston <matt@ucc.asn.au>
parents:
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87 goto LBL_V; |
eed26cff980b
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
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88 } |
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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changeset
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89 } |
eed26cff980b
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Matt Johnston <matt@ucc.asn.au>
parents:
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changeset
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90 |
eed26cff980b
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Matt Johnston <matt@ucc.asn.au>
parents:
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91 /* multiply by 2**k which we divided out at the beginning */ |
eed26cff980b
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Matt Johnston <matt@ucc.asn.au>
parents:
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92 if ((res = mp_mul_2d (&u, k, c)) != MP_OKAY) { |
eed26cff980b
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Matt Johnston <matt@ucc.asn.au>
parents:
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93 goto LBL_V; |
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
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94 } |
eed26cff980b
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Matt Johnston <matt@ucc.asn.au>
parents:
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95 c->sign = MP_ZPOS; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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changeset
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96 res = MP_OKAY; |
eed26cff980b
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Matt Johnston <matt@ucc.asn.au>
parents:
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97 LBL_V:mp_clear (&u); |
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Matt Johnston <matt@ucc.asn.au>
parents:
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98 LBL_U:mp_clear (&v); |
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Matt Johnston <matt@ucc.asn.au>
parents:
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99 return res; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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100 } |
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propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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101 #endif |
389
5ff8218bcee9
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents:
284
diff
changeset
|
102 |
5ff8218bcee9
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents:
284
diff
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103 /* $Source: /cvs/libtom/libtommath/bn_mp_gcd.c,v $ */ |
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Matt Johnston <matt@ucc.asn.au>
parents:
284
diff
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104 /* $Revision: 1.4 $ */ |
5ff8218bcee9
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents:
284
diff
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105 /* $Date: 2006/03/31 14:18:44 $ */ |