Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_ansi_x963_export.c @ 647:939cd3e22c87 dropbear-tfm

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- Fix constraints so we don't get warned about uninitialised variable (it isn't used as input by the asm)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 30 Nov 2011 23:15:21 +0800
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 $ */