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annotate libtomcrypt/src/pk/dsa/dsa_set_pqg_dsaparam.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +0800
parents 6dba84798cd5
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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 dsaparam
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16
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17 dsaparam data: openssl dsaparam -outform DER -out dsaparam.der 2048
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18
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19 @param dsaparam The DSA param DER encoded data
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20 @param dsaparamlen The length of dhparam data
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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 dsa_set_pqg_dsaparam(const unsigned char *dsaparam, unsigned long dsaparamlen,
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25 dsa_key *key)
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26 {
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27 int err, stat;
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28
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29 LTC_ARGCHK(dsaparam != NULL);
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30 LTC_ARGCHK(key != NULL);
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31 LTC_ARGCHK(ltc_mp.name != NULL);
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32
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33 /* init key */
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34 err = mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL);
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35 if (err != CRYPT_OK) return err;
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36
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37 if ((err = der_decode_sequence_multi(dsaparam, dsaparamlen,
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38 LTC_ASN1_INTEGER, 1UL, key->p,
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39 LTC_ASN1_INTEGER, 1UL, key->q,
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40 LTC_ASN1_INTEGER, 1UL, key->g,
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41 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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42 goto LBL_ERR;
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43 }
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44
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45 key->qord = mp_unsigned_bin_size(key->q);
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46
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47 /* quick p, q, g validation, without primality testing */
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48 if ((err = dsa_int_validate_pqg(key, &stat)) != CRYPT_OK) {
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49 goto LBL_ERR;
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50 }
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51 if (stat == 0) {
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52 err = CRYPT_INVALID_PACKET;
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53 goto LBL_ERR;
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54 }
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55
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56 return CRYPT_OK;
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57
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58 LBL_ERR:
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59 dsa_free(key);
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60 return err;
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61 }
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62
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63 #endif
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64
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65 /* ref: $Format:%D$ */
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66 /* git commit: $Format:%H$ */
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67 /* commit time: $Format:%ai$ */