Mercurial > dropbear

annotate src/pk/dsa/dsa_import.c @ 222:36160290a1b2 libtomcrypt LTC_DB_0.46

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* change include path of options.h * don't use the constant ROL/ROR operations, since compilers seem to have problems
author Matt Johnston <matt@ucc.asn.au>
date Fri, 08 Jul 2005 19:13:24 +0000
parents 39d5d58461d6
children
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191
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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 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file dsa_import.c
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15 DSA implementation, import a DSA key, Tom St Denis
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16 */
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17
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18 #ifdef MDSA
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19
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20 /**
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21 Import a DSA key
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22 @param in The binary packet to import from
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23 @param inlen The length of the binary packet
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24 @param key [out] Where to store the imported key
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25 @return CRYPT_OK if successful, upon error this function will free all allocated memory
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26 */
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27 int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key)
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28 {
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29 unsigned char flags[1];
191
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30 int err;
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31
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32 LTC_ARGCHK(in != NULL);
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33 LTC_ARGCHK(key != NULL);
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34
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35 /* init key */
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36 if (mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL) != MP_OKAY) {
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37 return CRYPT_MEM;
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38 }
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39
209
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40 /* get key type */
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41 if ((err = der_decode_sequence_multi(in, inlen,
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42 LTC_ASN1_BIT_STRING, 1UL, flags,
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43 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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44 goto error;
191
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45 }
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46
209
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47 if (flags[0] == 1) {
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48 if ((err = der_decode_sequence_multi(in, inlen,
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49 LTC_ASN1_BIT_STRING, 1UL, flags,
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50 LTC_ASN1_INTEGER, 1UL, &key->g,
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51 LTC_ASN1_INTEGER, 1UL, &key->p,
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52 LTC_ASN1_INTEGER, 1UL, &key->q,
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53 LTC_ASN1_INTEGER, 1UL, &key->y,
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54 LTC_ASN1_INTEGER, 1UL, &key->x,
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55 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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56 goto error;
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57 }
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58 key->type = PK_PRIVATE;
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59 } else {
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60 if ((err = der_decode_sequence_multi(in, inlen,
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61 LTC_ASN1_BIT_STRING, 1UL, flags,
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62 LTC_ASN1_INTEGER, 1UL, &key->g,
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63 LTC_ASN1_INTEGER, 1UL, &key->p,
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64 LTC_ASN1_INTEGER, 1UL, &key->q,
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65 LTC_ASN1_INTEGER, 1UL, &key->y,
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66 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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67 goto error;
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68 }
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69 key->type = PK_PUBLIC;
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70 }
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71 key->qord = mp_unsigned_bin_size(&key->q);
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72
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73 if (key->qord >= MDSA_MAX_GROUP || key->qord <= 15 ||
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74 key->qord >= mp_unsigned_bin_size(&key->p) || (mp_unsigned_bin_size(&key->p) - key->qord) >= MDSA_DELTA) {
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75 err = CRYPT_INVALID_PACKET;
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76 goto error;
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77 }
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78
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79 return CRYPT_OK;
191
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80 error:
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81 mp_clear_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL);
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82 return err;
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83 }
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84
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85 #endif
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86
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87 /* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_import.c,v $ */
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88 /* $Revision: 1.7 $ */
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89 /* $Date: 2005/06/08 23:31:17 $ */