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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 |
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12 #include "mycrypt.h" |
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13 |
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14 #ifdef MRSA |
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15 |
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16 int rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key) |
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17 { |
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18 unsigned long x, y; |
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19 int err; |
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20 |
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21 _ARGCHK(in != NULL); |
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22 _ARGCHK(key != NULL); |
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23 |
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24 /* check length */ |
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25 if (inlen < (1+PACKET_SIZE)) { |
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26 return CRYPT_INVALID_PACKET; |
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27 } |
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28 |
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29 /* test packet header */ |
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30 if ((err = packet_valid_header((unsigned char *)in, PACKET_SECT_RSA, PACKET_SUB_KEY)) != CRYPT_OK) { |
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31 return err; |
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32 } |
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33 |
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34 /* init key */ |
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35 if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, &key->qP, |
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36 &key->pQ, &key->p, &key->q, NULL)) != MP_OKAY) { |
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37 return mpi_to_ltc_error(err); |
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38 } |
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39 |
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40 /* get key type */ |
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41 y = PACKET_SIZE; |
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42 key->type = (int)in[y++]; |
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43 |
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44 /* load the modulus */ |
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45 INPUT_BIGNUM(&key->N, in, x, y, inlen); |
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46 |
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47 /* load public exponent */ |
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48 INPUT_BIGNUM(&key->e, in, x, y, inlen); |
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49 |
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50 /* get private exponent */ |
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51 if (key->type == PK_PRIVATE || key->type == PK_PRIVATE_OPTIMIZED) { |
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52 INPUT_BIGNUM(&key->d, in, x, y, inlen); |
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53 } |
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54 |
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55 /* get CRT private data if required */ |
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56 if (key->type == PK_PRIVATE_OPTIMIZED) { |
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57 INPUT_BIGNUM(&key->dQ, in, x, y, inlen); |
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58 INPUT_BIGNUM(&key->dP, in, x, y, inlen); |
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59 INPUT_BIGNUM(&key->pQ, in, x, y, inlen); |
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60 INPUT_BIGNUM(&key->qP, in, x, y, inlen); |
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61 INPUT_BIGNUM(&key->p, in, x, y, inlen); |
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62 INPUT_BIGNUM(&key->q, in, x, y, inlen); |
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63 } |
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64 |
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65 /* free up ram not required */ |
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66 if (key->type != PK_PRIVATE_OPTIMIZED) { |
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67 mp_clear_multi(&key->dQ, &key->dP, &key->pQ, &key->qP, &key->p, &key->q, NULL); |
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68 } |
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69 if (key->type != PK_PRIVATE && key->type != PK_PRIVATE_OPTIMIZED) { |
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70 mp_clear(&key->d); |
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71 } |
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72 |
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73 return CRYPT_OK; |
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74 error: |
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75 mp_clear_multi(&key->d, &key->e, &key->N, &key->dQ, &key->dP, |
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76 &key->pQ, &key->qP, &key->p, &key->q, NULL); |
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77 return err; |
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78 } |
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79 |
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80 #endif /* MRSA */ |
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81 |
