Mercurial > dropbear
annotate libtomcrypt/src/pk/ecc/ecc_ansi_x963_export.c @ 1524:d35cf9a5e0b5
rename default_options.h.in in docs too
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 20 Feb 2018 19:29:55 +0800 |
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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 |
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10 /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b |
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11 * |
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12 * All curves taken from NIST recommendation paper of July 1999 |
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13 * Available at http://csrc.nist.gov/cryptval/dss.htm |
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14 */ |
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15 #include "tomcrypt.h" |
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16 |
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17 /** |
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18 @file ecc_ansi_x963_export.c |
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19 ECC Crypto, Tom St Denis |
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20 */ |
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21 |
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22 #ifdef LTC_MECC |
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23 |
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24 /** ECC X9.63 (Sec. 4.3.6) uncompressed export |
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25 @param key Key to export |
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26 @param out [out] destination of export |
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27 @param outlen [in/out] Length of destination and final output size |
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28 Return CRYPT_OK on success |
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29 */ |
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30 int ecc_ansi_x963_export(ecc_key *key, unsigned char *out, unsigned long *outlen) |
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31 { |
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32 unsigned char buf[ECC_BUF_SIZE]; |
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33 unsigned long numlen, xlen, ylen; |
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34 |
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35 LTC_ARGCHK(key != NULL); |
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36 LTC_ARGCHK(outlen != NULL); |
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37 |
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38 if (ltc_ecc_is_valid_idx(key->idx) == 0) { |
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39 return CRYPT_INVALID_ARG; |
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40 } |
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41 numlen = key->dp->size; |
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42 xlen = mp_unsigned_bin_size(key->pubkey.x); |
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43 ylen = mp_unsigned_bin_size(key->pubkey.y); |
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44 |
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45 if (xlen > numlen || ylen > numlen || sizeof(buf) < numlen) { |
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46 return CRYPT_BUFFER_OVERFLOW; |
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47 } |
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48 |
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49 if (*outlen < (1 + 2*numlen)) { |
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50 *outlen = 1 + 2*numlen; |
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51 return CRYPT_BUFFER_OVERFLOW; |
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52 } |
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53 |
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54 LTC_ARGCHK(out != NULL); |
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55 |
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56 /* store byte 0x04 */ |
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57 out[0] = 0x04; |
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58 |
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59 /* pad and store x */ |
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60 zeromem(buf, sizeof(buf)); |
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61 mp_to_unsigned_bin(key->pubkey.x, buf + (numlen - xlen)); |
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62 XMEMCPY(out+1, buf, numlen); |
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63 |
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64 /* pad and store y */ |
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65 zeromem(buf, sizeof(buf)); |
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66 mp_to_unsigned_bin(key->pubkey.y, buf + (numlen - ylen)); |
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67 XMEMCPY(out+1+numlen, buf, numlen); |
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68 |
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69 *outlen = 1 + 2*numlen; |
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70 return CRYPT_OK; |
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71 } |
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72 |
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73 #endif |
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74 |
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75 /* ref: $Format:%D$ */ |
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76 /* git commit: $Format:%H$ */ |
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77 /* commit time: $Format:%ai$ */ |