Mercurial > dropbear
annotate libtommath/bn_mp_prime_random_ex.c @ 1156:a8f4dade70e5
avoid getpass when not used
some systems (like android's bionic) do not provide getpass. you can
disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid
its use (and rely on pubkey auth), but the link still fails because
the support file calls getpass. do not define this func if both of
those auth methods are not used.
author | Mike Frysinger <vapier@gentoo.org> |
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date | Wed, 21 Oct 2015 22:39:55 +0800 |
parents | 5ff8218bcee9 |
children | 60fc6476e044 |
rev | line source |
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284
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1 #include <tommath.h> |
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2 #ifdef BN_MP_PRIME_RANDOM_EX_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 /* makes a truly random prime of a given size (bits), |
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19 * |
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20 * Flags are as follows: |
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21 * |
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22 * LTM_PRIME_BBS - make prime congruent to 3 mod 4 |
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23 * LTM_PRIME_SAFE - make sure (p-1)/2 is prime as well (implies LTM_PRIME_BBS) |
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24 * LTM_PRIME_2MSB_OFF - make the 2nd highest bit zero |
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25 * LTM_PRIME_2MSB_ON - make the 2nd highest bit one |
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26 * |
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27 * You have to supply a callback which fills in a buffer with random bytes. "dat" is a parameter you can |
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28 * have passed to the callback (e.g. a state or something). This function doesn't use "dat" itself |
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29 * so it can be NULL |
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30 * |
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31 */ |
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32 |
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33 /* This is possibly the mother of all prime generation functions, muahahahahaha! */ |
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34 int mp_prime_random_ex(mp_int *a, int t, int size, int flags, ltm_prime_callback cb, void *dat) |
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35 { |
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36 unsigned char *tmp, maskAND, maskOR_msb, maskOR_lsb; |
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37 int res, err, bsize, maskOR_msb_offset; |
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38 |
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39 /* sanity check the input */ |
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40 if (size <= 1 || t <= 0) { |
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41 return MP_VAL; |
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42 } |
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43 |
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44 /* LTM_PRIME_SAFE implies LTM_PRIME_BBS */ |
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45 if (flags & LTM_PRIME_SAFE) { |
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46 flags |= LTM_PRIME_BBS; |
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47 } |
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48 |
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49 /* calc the byte size */ |
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50 bsize = (size>>3) + ((size&7)?1:0); |
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51 |
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52 /* we need a buffer of bsize bytes */ |
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53 tmp = OPT_CAST(unsigned char) XMALLOC(bsize); |
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54 if (tmp == NULL) { |
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55 return MP_MEM; |
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56 } |
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57 |
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58 /* calc the maskAND value for the MSbyte*/ |
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59 maskAND = ((size&7) == 0) ? 0xFF : (0xFF >> (8 - (size & 7))); |
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60 |
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61 /* calc the maskOR_msb */ |
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62 maskOR_msb = 0; |
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63 maskOR_msb_offset = ((size & 7) == 1) ? 1 : 0; |
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64 if (flags & LTM_PRIME_2MSB_ON) { |
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65 maskOR_msb |= 0x80 >> ((9 - size) & 7); |
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66 } |
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67 |
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68 /* get the maskOR_lsb */ |
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69 maskOR_lsb = 1; |
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70 if (flags & LTM_PRIME_BBS) { |
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71 maskOR_lsb |= 3; |
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72 } |
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73 |
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74 do { |
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75 /* read the bytes */ |
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76 if (cb(tmp, bsize, dat) != bsize) { |
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77 err = MP_VAL; |
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78 goto error; |
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79 } |
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80 |
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81 /* work over the MSbyte */ |
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Matt Johnston <matt@ucc.asn.au>
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82 tmp[0] &= maskAND; |
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Matt Johnston <matt@ucc.asn.au>
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83 tmp[0] |= 1 << ((size - 1) & 7); |
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Matt Johnston <matt@ucc.asn.au>
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84 |
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Matt Johnston <matt@ucc.asn.au>
parents:
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85 /* mix in the maskORs */ |
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Matt Johnston <matt@ucc.asn.au>
parents:
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86 tmp[maskOR_msb_offset] |= maskOR_msb; |
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Matt Johnston <matt@ucc.asn.au>
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87 tmp[bsize-1] |= maskOR_lsb; |
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Matt Johnston <matt@ucc.asn.au>
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88 |
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Matt Johnston <matt@ucc.asn.au>
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89 /* read it in */ |
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Matt Johnston <matt@ucc.asn.au>
parents:
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90 if ((err = mp_read_unsigned_bin(a, tmp, bsize)) != MP_OKAY) { goto error; } |
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Matt Johnston <matt@ucc.asn.au>
parents:
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91 |
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Matt Johnston <matt@ucc.asn.au>
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92 /* is it prime? */ |
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Matt Johnston <matt@ucc.asn.au>
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93 if ((err = mp_prime_is_prime(a, t, &res)) != MP_OKAY) { goto error; } |
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Matt Johnston <matt@ucc.asn.au>
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94 if (res == MP_NO) { |
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Matt Johnston <matt@ucc.asn.au>
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95 continue; |
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96 } |
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97 |
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98 if (flags & LTM_PRIME_SAFE) { |
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Matt Johnston <matt@ucc.asn.au>
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99 /* see if (a-1)/2 is prime */ |
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Matt Johnston <matt@ucc.asn.au>
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100 if ((err = mp_sub_d(a, 1, a)) != MP_OKAY) { goto error; } |
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Matt Johnston <matt@ucc.asn.au>
parents:
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101 if ((err = mp_div_2(a, a)) != MP_OKAY) { goto error; } |
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Matt Johnston <matt@ucc.asn.au>
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102 |
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103 /* is it prime? */ |
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Matt Johnston <matt@ucc.asn.au>
parents:
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104 if ((err = mp_prime_is_prime(a, t, &res)) != MP_OKAY) { goto error; } |
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Matt Johnston <matt@ucc.asn.au>
parents:
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105 } |
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106 } while (res == MP_NO); |
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Matt Johnston <matt@ucc.asn.au>
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107 |
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108 if (flags & LTM_PRIME_SAFE) { |
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Matt Johnston <matt@ucc.asn.au>
parents:
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109 /* restore a to the original value */ |
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Matt Johnston <matt@ucc.asn.au>
parents:
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110 if ((err = mp_mul_2(a, a)) != MP_OKAY) { goto error; } |
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Matt Johnston <matt@ucc.asn.au>
parents:
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111 if ((err = mp_add_d(a, 1, a)) != MP_OKAY) { goto error; } |
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
112 } |
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parents:
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113 |
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
114 err = MP_OKAY; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
115 error: |
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
116 XFREE(tmp); |
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Matt Johnston <matt@ucc.asn.au>
parents:
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117 return err; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
118 } |
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Matt Johnston <matt@ucc.asn.au>
parents:
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119 |
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Matt Johnston <matt@ucc.asn.au>
parents:
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120 |
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Matt Johnston <matt@ucc.asn.au>
parents:
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121 #endif |
389
5ff8218bcee9
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Matt Johnston <matt@ucc.asn.au>
parents:
284
diff
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|
122 |
5ff8218bcee9
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Matt Johnston <matt@ucc.asn.au>
parents:
284
diff
changeset
|
123 /* $Source: /cvs/libtom/libtommath/bn_mp_prime_random_ex.c,v $ */ |
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propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents:
284
diff
changeset
|
124 /* $Revision: 1.4 $ */ |
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Matt Johnston <matt@ucc.asn.au>
parents:
284
diff
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|
125 /* $Date: 2006/03/31 14:18:44 $ */ |