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annotate libtomcrypt/src/pk/dsa/dsa_set.c @ 1857:6022df862942

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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>
date Tue, 25 Jan 2022 17:32:20 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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 #include "tomcrypt.h"
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10
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11
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12 #ifdef LTC_MDSA
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13
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14 /**
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15 Import DSA's p, q & g from raw numbers
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16 @param p DSA's p in binary representation
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17 @param plen The length of p
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18 @param q DSA's q in binary representation
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19 @param qlen The length of q
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20 @param g DSA's g in binary representation
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21 @param glen The length of g
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22 @param key [out] the destination for the imported key
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23 @return CRYPT_OK if successful.
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24 */
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25 int dsa_set_pqg(const unsigned char *p, unsigned long plen,
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26 const unsigned char *q, unsigned long qlen,
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27 const unsigned char *g, unsigned long glen,
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28 dsa_key *key)
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29 {
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30 int err, stat;
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31
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32 LTC_ARGCHK(p != NULL);
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33 LTC_ARGCHK(q != NULL);
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34 LTC_ARGCHK(g != NULL);
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35 LTC_ARGCHK(key != NULL);
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36 LTC_ARGCHK(ltc_mp.name != NULL);
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37
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38 /* init key */
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39 err = mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL);
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40 if (err != CRYPT_OK) return err;
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41
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42 if ((err = mp_read_unsigned_bin(key->p, (unsigned char *)p , plen)) != CRYPT_OK) { goto LBL_ERR; }
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43 if ((err = mp_read_unsigned_bin(key->g, (unsigned char *)g , glen)) != CRYPT_OK) { goto LBL_ERR; }
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44 if ((err = mp_read_unsigned_bin(key->q, (unsigned char *)q , qlen)) != CRYPT_OK) { goto LBL_ERR; }
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45
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46 key->qord = mp_unsigned_bin_size(key->q);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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47
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48 /* do only a quick validation, without primality testing */
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49 if ((err = dsa_int_validate_pqg(key, &stat)) != CRYPT_OK) { goto LBL_ERR; }
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50 if (stat == 0) {
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51 err = CRYPT_INVALID_PACKET;
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52 goto LBL_ERR;
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53 }
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54
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55 return CRYPT_OK;
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56
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57 LBL_ERR:
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58 dsa_free(key);
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59 return err;
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60 }
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61
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62 /**
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63 Import DSA public or private key-part from raw numbers
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64
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65 NB: The p, q & g parts must be set beforehand
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66
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67 @param in The key-part to import, either public or private.
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68 @param inlen The key-part's length
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69 @param type Which type of key (PK_PRIVATE or PK_PUBLIC)
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70 @param key [out] the destination for the imported key
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71 @return CRYPT_OK if successful.
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72 */
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73 int dsa_set_key(const unsigned char *in, unsigned long inlen, int type, dsa_key *key)
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74 {
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75 int err, stat = 0;
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76
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77 LTC_ARGCHK(key != NULL);
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78 LTC_ARGCHK(key->x != NULL);
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79 LTC_ARGCHK(key->y != NULL);
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80 LTC_ARGCHK(key->p != NULL);
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81 LTC_ARGCHK(key->g != NULL);
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82 LTC_ARGCHK(key->q != NULL);
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83 LTC_ARGCHK(ltc_mp.name != NULL);
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84
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85 if (type == PK_PRIVATE) {
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86 key->type = PK_PRIVATE;
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87 if ((err = mp_read_unsigned_bin(key->x, (unsigned char *)in, inlen)) != CRYPT_OK) { goto LBL_ERR; }
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88 if ((err = mp_exptmod(key->g, key->x, key->p, key->y)) != CRYPT_OK) { goto LBL_ERR; }
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89 }
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90 else {
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91 key->type = PK_PUBLIC;
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92 if ((err = mp_read_unsigned_bin(key->y, (unsigned char *)in, inlen)) != CRYPT_OK) { goto LBL_ERR; }
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93 }
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94
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95 if ((err = dsa_int_validate_xy(key, &stat)) != CRYPT_OK) { goto LBL_ERR; }
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96 if (stat == 0) {
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97 err = CRYPT_INVALID_PACKET;
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98 goto LBL_ERR;
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99 }
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100
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101 return CRYPT_OK;
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102
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103 LBL_ERR:
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104 dsa_free(key);
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105 return err;
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106 }
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107
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108 #endif
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109
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110 /* ref: $Format:%D$ */
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111 /* git commit: $Format:%H$ */
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112 /* commit time: $Format:%ai$ */