Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_ansi_x963_export.c @ 994:5c5ade336926

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Prefer stronger algorithms in algorithm negotiation. Prefer diffie-hellman-group14-sha1 (2048 bit) over diffie-hellman-group1-sha1 (1024 bit). Due to meet-in-the-middle attacks the effective key length of three key 3DES is 112 bits. AES is stronger and faster then 3DES. Prefer to delay the start of compression until after authentication has completed. This avoids exposing compression code to attacks from unauthenticated users. (github pull request #9)
author Fedor Brunner <fedor.brunner@azet.sk>
date Fri, 23 Jan 2015 23:00:25 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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 $ */