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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_export(unsigned char *out, unsigned long *outlen, int type, rsa_key *key) |
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17 { |
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18 unsigned long y, z; |
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19 int err; |
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20 |
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21 _ARGCHK(out != NULL); |
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22 _ARGCHK(outlen != NULL); |
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23 _ARGCHK(key != NULL); |
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24 |
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25 /* can we store the static header? */ |
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26 if (*outlen < (PACKET_SIZE + 1)) { |
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27 return CRYPT_BUFFER_OVERFLOW; |
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28 } |
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29 |
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30 /* type valid? */ |
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31 if (!(key->type == PK_PRIVATE || key->type == PK_PRIVATE_OPTIMIZED) && |
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32 (type == PK_PRIVATE || type == PK_PRIVATE_OPTIMIZED)) { |
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33 return CRYPT_PK_INVALID_TYPE; |
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34 } |
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35 |
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36 /* start at offset y=PACKET_SIZE */ |
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37 y = PACKET_SIZE; |
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38 |
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39 /* output key type */ |
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40 out[y++] = type; |
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41 |
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42 /* output modulus */ |
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43 OUTPUT_BIGNUM(&key->N, out, y, z); |
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44 |
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45 /* output public key */ |
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46 OUTPUT_BIGNUM(&key->e, out, y, z); |
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47 |
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48 if (type == PK_PRIVATE || type == PK_PRIVATE_OPTIMIZED) { |
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49 OUTPUT_BIGNUM(&key->d, out, y, z); |
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50 } |
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51 |
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52 if (type == PK_PRIVATE_OPTIMIZED) { |
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53 OUTPUT_BIGNUM(&key->dQ, out, y, z); |
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54 OUTPUT_BIGNUM(&key->dP, out, y, z); |
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55 OUTPUT_BIGNUM(&key->pQ, out, y, z); |
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56 OUTPUT_BIGNUM(&key->qP, out, y, z); |
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57 OUTPUT_BIGNUM(&key->p, out, y, z); |
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58 OUTPUT_BIGNUM(&key->q, out, y, z); |
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59 } |
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60 |
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61 /* store packet header */ |
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62 packet_store_header(out, PACKET_SECT_RSA, PACKET_SUB_KEY); |
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63 |
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64 /* copy to the user buffer */ |
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65 *outlen = y; |
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66 |
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67 /* clear stack and return */ |
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68 return CRYPT_OK; |
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69 } |
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70 |
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71 #endif /* MRSA */ |
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72 |
