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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.com |
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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 katja_import.c |
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15 Import a PKCS-style Katja key, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef MKAT |
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19 |
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20 /** |
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21 Import an KatjaPublicKey or KatjaPrivateKey [two-prime only, only support >= 1024-bit keys, defined in PKCS #1 v2.1] |
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22 @param in The packet to import from |
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23 @param inlen It's length (octets) |
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24 @param key [out] Destination for newly imported key |
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25 @return CRYPT_OK if successful, upon error allocated memory is freed |
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26 */ |
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27 int katja_import(const unsigned char *in, unsigned long inlen, katja_key *key) |
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28 { |
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29 int err; |
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30 void *zero; |
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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 LTC_ARGCHK(ltc_mp.name != NULL); |
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35 |
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36 /* init key */ |
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37 if ((err = mp_init_multi(&zero, &key->d, &key->N, &key->dQ, |
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38 &key->dP, &key->qP, &key->p, &key->q, &key->pq, NULL)) != CRYPT_OK) { |
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39 return err; |
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40 } |
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41 |
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42 if ((err = der_decode_sequence_multi(in, inlen, |
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43 LTC_ASN1_INTEGER, 1UL, key->N, |
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44 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
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45 goto LBL_ERR; |
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46 } |
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47 |
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48 if (mp_cmp_d(key->N, 0) == LTC_MP_EQ) { |
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49 /* it's a private key */ |
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50 if ((err = der_decode_sequence_multi(in, inlen, |
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51 LTC_ASN1_INTEGER, 1UL, zero, |
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52 LTC_ASN1_INTEGER, 1UL, key->N, |
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53 LTC_ASN1_INTEGER, 1UL, key->d, |
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54 LTC_ASN1_INTEGER, 1UL, key->p, |
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55 LTC_ASN1_INTEGER, 1UL, key->q, |
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56 LTC_ASN1_INTEGER, 1UL, key->dP, |
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57 LTC_ASN1_INTEGER, 1UL, key->dQ, |
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58 LTC_ASN1_INTEGER, 1UL, key->qP, |
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59 LTC_ASN1_INTEGER, 1UL, key->pq, |
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60 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
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61 goto LBL_ERR; |
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62 } |
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63 key->type = PK_PRIVATE; |
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64 } else { |
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65 /* public we have N */ |
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66 key->type = PK_PUBLIC; |
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67 } |
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68 mp_clear(zero); |
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69 return CRYPT_OK; |
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70 LBL_ERR: |
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71 mp_clear_multi(zero, key->d, key->N, key->dQ, key->dP, |
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72 key->qP, key->p, key->q, key->pq, NULL); |
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73 return err; |
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74 } |
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75 |
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76 #endif /* MRSA */ |
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77 |
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78 |
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79 /* $Source: /cvs/libtom/libtomcrypt/src/pk/katja/katja_import.c,v $ */ |
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80 /* $Revision: 1.3 $ */ |
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81 /* $Date: 2006/03/31 14:15:35 $ */ |
