Mercurial > dropbear
annotate libtomcrypt/src/pk/dh/dh_set.c @ 1857:6022df862942
Use DSCP for IP QoS traffic classes
The previous TOS values are deprecated and not used by modern traffic
classifiers. This sets AF21 for "interactive" traffic (with a tty).
Non-tty traffic sets AF11 - that indicates high throughput but is not
lowest priority (which would be CS1 or LE).
This differs from the CS1 used by OpenSSH, it lets interactive git over SSH
have higher priority than background least effort traffic. Dropbear's settings
here should be suitable with the diffservs used by CAKE qdisc.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 25 Jan 2022 17:32:20 +0800 |
parents | 6dba84798cd5 |
children |
rev | line source |
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1471
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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 |
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10 #include "tomcrypt.h" |
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11 |
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12 #ifdef LTC_MDH |
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13 |
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14 /** |
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15 Import DH key parts p and g from raw numbers |
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16 |
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17 @param p DH's p (prime) |
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18 @param plen DH's p's length |
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19 @param g DH's g (group) |
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20 @param glen DH's g's length |
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21 @param key [out] the destination for the imported key |
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22 @return CRYPT_OK if successful |
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23 */ |
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24 int dh_set_pg(const unsigned char *p, unsigned long plen, |
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25 const unsigned char *g, unsigned long glen, |
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26 dh_key *key) |
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27 { |
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28 int err; |
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29 |
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30 LTC_ARGCHK(key != NULL); |
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31 LTC_ARGCHK(p != NULL); |
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32 LTC_ARGCHK(g != NULL); |
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33 LTC_ARGCHK(ltc_mp.name != NULL); |
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34 |
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35 if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) { |
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36 return err; |
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37 } |
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38 |
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39 if ((err = mp_read_unsigned_bin(key->base, (unsigned char*)g, glen)) != CRYPT_OK) { goto LBL_ERR; } |
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40 if ((err = mp_read_unsigned_bin(key->prime, (unsigned char*)p, plen)) != CRYPT_OK) { goto LBL_ERR; } |
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41 |
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42 return CRYPT_OK; |
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43 |
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44 LBL_ERR: |
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45 dh_free(key); |
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46 return err; |
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47 } |
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48 |
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49 /** |
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50 Import DH key parts p and g from built-in DH groups |
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51 |
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52 @param groupsize The size of the DH group to use |
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53 @param key [out] Where the newly created DH key will be stored |
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54 @return CRYPT_OK if successful, note: on error all allocated memory will be freed automatically. |
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55 */ |
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56 int dh_set_pg_groupsize(int groupsize, dh_key *key) |
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57 { |
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58 int err, i; |
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59 |
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60 LTC_ARGCHK(key != NULL); |
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61 LTC_ARGCHK(ltc_mp.name != NULL); |
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62 LTC_ARGCHK(groupsize > 0); |
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63 |
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64 for (i = 0; (groupsize > ltc_dh_sets[i].size) && (ltc_dh_sets[i].size != 0); i++); |
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65 if (ltc_dh_sets[i].size == 0) return CRYPT_INVALID_KEYSIZE; |
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66 |
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67 if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) { |
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68 return err; |
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69 } |
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70 if ((err = mp_read_radix(key->base, ltc_dh_sets[i].base, 16)) != CRYPT_OK) { goto LBL_ERR; } |
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71 if ((err = mp_read_radix(key->prime, ltc_dh_sets[i].prime, 16)) != CRYPT_OK) { goto LBL_ERR; } |
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72 |
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73 return CRYPT_OK; |
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74 |
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75 LBL_ERR: |
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76 dh_free(key); |
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77 return err; |
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78 } |
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79 |
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80 /** |
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81 Import DH public or private key part from raw numbers |
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82 |
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83 NB: The p & g parts must be set beforehand |
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84 |
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85 @param in The key-part to import, either public or private. |
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86 @param inlen The key-part's length |
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87 @param type Which type of key (PK_PRIVATE or PK_PUBLIC) |
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88 @param key [out] the destination for the imported key |
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89 @return CRYPT_OK if successful |
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90 */ |
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91 int dh_set_key(const unsigned char *in, unsigned long inlen, int type, dh_key *key) |
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92 { |
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93 int err; |
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94 |
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95 LTC_ARGCHK(key != NULL); |
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96 LTC_ARGCHK(ltc_mp.name != NULL); |
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97 |
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98 if (type == PK_PRIVATE) { |
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99 key->type = PK_PRIVATE; |
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100 if ((err = mp_read_unsigned_bin(key->x, (unsigned char*)in, inlen)) != CRYPT_OK) { goto LBL_ERR; } |
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101 if ((err = mp_exptmod(key->base, key->x, key->prime, key->y)) != CRYPT_OK) { goto LBL_ERR; } |
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102 } |
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103 else { |
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104 key->type = PK_PUBLIC; |
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105 if ((err = mp_read_unsigned_bin(key->y, (unsigned char*)in, inlen)) != CRYPT_OK) { goto LBL_ERR; } |
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106 } |
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107 |
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108 /* check public key */ |
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109 if ((err = dh_check_pubkey(key)) != CRYPT_OK) { |
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110 goto LBL_ERR; |
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111 } |
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112 |
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113 return CRYPT_OK; |
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114 |
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115 LBL_ERR: |
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116 dh_free(key); |
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117 return err; |
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118 } |
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119 |
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120 #endif /* LTC_MDH */ |
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121 |
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122 /* ref: $Format:%D$ */ |
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123 /* git commit: $Format:%H$ */ |
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124 /* commit time: $Format:%ai$ */ |