Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_ansi_x963_export.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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 $ */