Mercurial > dropbear
annotate libtomcrypt/src/pk/ecc/ecc_ansi_x963_export.c @ 660:a842469ce8ad
- Fix minor leak
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 22 Feb 2012 22:05:24 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
rev | line source |
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382
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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 |
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12 /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b |
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13 * |
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14 * All curves taken from NIST recommendation paper of July 1999 |
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15 * Available at http://csrc.nist.gov/cryptval/dss.htm |
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16 */ |
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17 #include "tomcrypt.h" |
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18 |
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19 /** |
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20 @file ecc_ansi_x963_export.c |
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21 ECC Crypto, Tom St Denis |
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22 */ |
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23 |
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24 #ifdef MECC |
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25 |
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26 /** ECC X9.63 (Sec. 4.3.6) uncompressed export |
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27 @param key Key to export |
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28 @param out [out] destination of export |
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29 @param outlen [in/out] Length of destination and final output size |
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30 Return CRYPT_OK on success |
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31 */ |
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32 int ecc_ansi_x963_export(ecc_key *key, unsigned char *out, unsigned long *outlen) |
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33 { |
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34 unsigned char buf[ECC_BUF_SIZE]; |
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35 unsigned long numlen; |
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36 |
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37 LTC_ARGCHK(key != NULL); |
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38 LTC_ARGCHK(out != NULL); |
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39 LTC_ARGCHK(outlen != NULL); |
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40 |
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41 if (ltc_ecc_is_valid_idx(key->idx) == 0) { |
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42 return CRYPT_INVALID_ARG; |
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43 } |
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44 numlen = key->dp->size; |
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45 |
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46 if (*outlen < (1 + 2*numlen)) { |
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47 *outlen = 1 + 2*numlen; |
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48 return CRYPT_BUFFER_OVERFLOW; |
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49 } |
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50 |
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51 /* store byte 0x04 */ |
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52 out[0] = 0x04; |
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53 |
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54 /* pad and store x */ |
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55 zeromem(buf, sizeof(buf)); |
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56 mp_to_unsigned_bin(key->pubkey.x, buf + (numlen - mp_unsigned_bin_size(key->pubkey.x))); |
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57 XMEMCPY(out+1, buf, numlen); |
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58 |
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59 /* pad and store y */ |
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60 zeromem(buf, sizeof(buf)); |
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61 mp_to_unsigned_bin(key->pubkey.y, buf + (numlen - mp_unsigned_bin_size(key->pubkey.y))); |
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62 XMEMCPY(out+1+numlen, buf, numlen); |
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63 |
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64 *outlen = 1 + 2*numlen; |
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65 return CRYPT_OK; |
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66 } |
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67 |
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68 #endif |
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69 |
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70 /* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ecc_ansi_x963_export.c,v $ */ |
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71 /* $Revision: 1.4 $ */ |
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72 /* $Date: 2006/12/04 02:50:11 $ */ |