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annotate libtomcrypt/src/pk/dsa/dsa_set.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 6dba84798cd5
children
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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);
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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: $Format:%ai$ */