Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_ansi_x963_export.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 6dba84798cd5
children
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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: $Format:%ai$ */