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annotate libtomcrypt/src/pk/dsa/dsa_set.c @ 1844:7a3cd7b598d8

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author Matt Johnston <matt@ucc.asn.au>
date Mon, 18 Oct 2021 23:31:23 +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: $Format:%ai$ */