Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_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 ac2158e3e403
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_export.c
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21 ECC Crypto, Tom St Denis
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22 */
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23
761
ac2158e3e403 ecc kind of works, needs fixing/testing
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24 #if defined(MECC) && defined(LTC_DER)
382
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25
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26 /**
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27 Export an ECC key as a binary packet
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28 @param out [out] Destination for the key
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29 @param outlen [in/out] Max size and resulting size of the exported key
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30 @param type The type of key you want to export (PK_PRIVATE or PK_PUBLIC)
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31 @param key The key to export
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32 @return CRYPT_OK if successful
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33 */
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34 int ecc_export(unsigned char *out, unsigned long *outlen, int type, ecc_key *key)
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35 {
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36 int err;
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37 unsigned char flags[1];
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38 unsigned long key_size;
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39
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40 LTC_ARGCHK(out != NULL);
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41 LTC_ARGCHK(outlen != NULL);
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42 LTC_ARGCHK(key != NULL);
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43
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44 /* type valid? */
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45 if (key->type != PK_PRIVATE && type == PK_PRIVATE) {
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46 return CRYPT_PK_TYPE_MISMATCH;
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47 }
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48
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49 if (ltc_ecc_is_valid_idx(key->idx) == 0) {
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50 return CRYPT_INVALID_ARG;
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51 }
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52
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53 /* we store the NIST byte size */
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54 key_size = key->dp->size;
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55
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56 if (type == PK_PRIVATE) {
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57 flags[0] = 1;
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58 err = der_encode_sequence_multi(out, outlen,
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59 LTC_ASN1_BIT_STRING, 1UL, flags,
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60 LTC_ASN1_SHORT_INTEGER, 1UL, &key_size,
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61 LTC_ASN1_INTEGER, 1UL, key->pubkey.x,
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62 LTC_ASN1_INTEGER, 1UL, key->pubkey.y,
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63 LTC_ASN1_INTEGER, 1UL, key->k,
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64 LTC_ASN1_EOL, 0UL, NULL);
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65 } else {
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66 flags[0] = 0;
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67 err = der_encode_sequence_multi(out, outlen,
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68 LTC_ASN1_BIT_STRING, 1UL, flags,
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69 LTC_ASN1_SHORT_INTEGER, 1UL, &key_size,
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70 LTC_ASN1_INTEGER, 1UL, key->pubkey.x,
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71 LTC_ASN1_INTEGER, 1UL, key->pubkey.y,
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72 LTC_ASN1_EOL, 0UL, NULL);
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73 }
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74
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75 return err;
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76 }
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77
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78 #endif
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79 /* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ecc_export.c,v $ */
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80 /* $Revision: 1.4 $ */
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81 /* $Date: 2006/11/21 00:10:18 $ */
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82