Mercurial > dropbear
annotate libtomcrypt/src/pk/dsa/dsa_verify_key.c @ 447:278805938dcf
Patch from Nicolai Ehemann to try binding before going to the background,
so that if it exits early (because something's already listening etc)
then it will return an exitcode of 1.
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Thu, 19 Jul 2007 15:54:18 +0000 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
rev | line source |
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 * |
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9 * Tom St Denis, [email protected], http://libtomcrypt.com |
285
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10 */ |
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11 #include "tomcrypt.h" |
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12 |
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13 /** |
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14 @file dsa_verify_key.c |
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15 DSA implementation, verify a key, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef MDSA |
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19 |
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20 /** |
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21 Verify a DSA key for validity |
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22 @param key The key to verify |
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23 @param stat [out] Result of test, 1==valid, 0==invalid |
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24 @return CRYPT_OK if successful |
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25 */ |
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26 int dsa_verify_key(dsa_key *key, int *stat) |
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27 { |
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28 void *tmp, *tmp2; |
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29 int res, err; |
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30 |
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31 LTC_ARGCHK(key != NULL); |
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32 LTC_ARGCHK(stat != NULL); |
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33 |
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34 /* default to an invalid key */ |
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35 *stat = 0; |
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36 |
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37 /* first make sure key->q and key->p are prime */ |
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38 if ((err = mp_prime_is_prime(key->q, 8, &res)) != CRYPT_OK) { |
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39 return err; |
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40 } |
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41 if (res == 0) { |
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42 return CRYPT_OK; |
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43 } |
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44 |
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45 if ((err = mp_prime_is_prime(key->p, 8, &res)) != CRYPT_OK) { |
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46 return err; |
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47 } |
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48 if (res == 0) { |
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49 return CRYPT_OK; |
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50 } |
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51 |
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52 /* now make sure that g is not -1, 0 or 1 and <p */ |
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53 if (mp_cmp_d(key->g, 0) == LTC_MP_EQ || mp_cmp_d(key->g, 1) == LTC_MP_EQ) { |
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54 return CRYPT_OK; |
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55 } |
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56 if ((err = mp_init_multi(&tmp, &tmp2, NULL)) != CRYPT_OK) { return err; } |
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57 if ((err = mp_sub_d(key->p, 1, tmp)) != CRYPT_OK) { goto error; } |
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58 if (mp_cmp(tmp, key->g) == LTC_MP_EQ || mp_cmp(key->g, key->p) != LTC_MP_LT) { |
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59 err = CRYPT_OK; |
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60 goto error; |
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61 } |
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62 |
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63 /* 1 < y < p-1 */ |
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64 if (!(mp_cmp_d(key->y, 1) == LTC_MP_GT && mp_cmp(key->y, tmp) == LTC_MP_LT)) { |
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65 err = CRYPT_OK; |
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66 goto error; |
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67 } |
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68 |
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69 /* now we have to make sure that g^q = 1, and that p-1/q gives 0 remainder */ |
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70 if ((err = mp_div(tmp, key->q, tmp, tmp2)) != CRYPT_OK) { goto error; } |
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71 if (mp_iszero(tmp2) != LTC_MP_YES) { |
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72 err = CRYPT_OK; |
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73 goto error; |
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74 } |
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75 |
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76 if ((err = mp_exptmod(key->g, key->q, key->p, tmp)) != CRYPT_OK) { goto error; } |
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77 if (mp_cmp_d(tmp, 1) != LTC_MP_EQ) { |
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78 err = CRYPT_OK; |
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79 goto error; |
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80 } |
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81 |
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82 /* now we have to make sure that y^q = 1, this makes sure y \in g^x mod p */ |
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83 if ((err = mp_exptmod(key->y, key->q, key->p, tmp)) != CRYPT_OK) { goto error; } |
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84 if (mp_cmp_d(tmp, 1) != LTC_MP_EQ) { |
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85 err = CRYPT_OK; |
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86 goto error; |
285
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87 } |
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88 |
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89 /* at this point we are out of tests ;-( */ |
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90 err = CRYPT_OK; |
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91 *stat = 1; |
382
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92 error: |
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93 mp_clear_multi(tmp, tmp2, NULL); |
285
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94 return err; |
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95 } |
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96 #endif |
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97 |
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98 /* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_verify_key.c,v $ */ |
382
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99 /* $Revision: 1.6 $ */ |
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100 /* $Date: 2006/12/04 03:18:43 $ */ |