Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_ansi_x963_export.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
parents 6dba84798cd5
children
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
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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: $Format:%ai$ */