Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_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_export.c
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19 ECC Crypto, Tom St Denis
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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20 */
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21
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22 #if defined(LTC_MECC) && defined(LTC_DER)
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23
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24 /**
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25 Export an ECC key as a binary packet
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26 @param out [out] Destination for the key
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27 @param outlen [in/out] Max size and resulting size of the exported key
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28 @param type The type of key you want to export (PK_PRIVATE or PK_PUBLIC)
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29 @param key The key to export
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30 @return CRYPT_OK if successful
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31 */
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32 int ecc_export(unsigned char *out, unsigned long *outlen, int type, ecc_key *key)
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33 {
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34 int err;
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35 unsigned char flags[1];
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36 unsigned long key_size;
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37
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38 LTC_ARGCHK(out != NULL);
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39 LTC_ARGCHK(outlen != NULL);
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40 LTC_ARGCHK(key != NULL);
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41
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42 /* type valid? */
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43 if (key->type != PK_PRIVATE && type == PK_PRIVATE) {
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44 return CRYPT_PK_TYPE_MISMATCH;
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45 }
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46
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47 if (ltc_ecc_is_valid_idx(key->idx) == 0) {
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48 return CRYPT_INVALID_ARG;
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49 }
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50
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51 /* we store the NIST byte size */
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52 key_size = key->dp->size;
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53
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54 if (type == PK_PRIVATE) {
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55 flags[0] = 1;
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56 err = der_encode_sequence_multi(out, outlen,
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57 LTC_ASN1_BIT_STRING, 1UL, flags,
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58 LTC_ASN1_SHORT_INTEGER, 1UL, &key_size,
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59 LTC_ASN1_INTEGER, 1UL, key->pubkey.x,
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60 LTC_ASN1_INTEGER, 1UL, key->pubkey.y,
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61 LTC_ASN1_INTEGER, 1UL, key->k,
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62 LTC_ASN1_EOL, 0UL, NULL);
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63 } else {
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64 flags[0] = 0;
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65 err = der_encode_sequence_multi(out, outlen,
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66 LTC_ASN1_BIT_STRING, 1UL, flags,
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67 LTC_ASN1_SHORT_INTEGER, 1UL, &key_size,
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68 LTC_ASN1_INTEGER, 1UL, key->pubkey.x,
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69 LTC_ASN1_INTEGER, 1UL, key->pubkey.y,
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70 LTC_ASN1_EOL, 0UL, NULL);
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71 }
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72
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73 return err;
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74 }
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75
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76 #endif
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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77 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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78 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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79 /* commit time: $Format:%ai$ */
382
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80