Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_export.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 0cbe8f6dbf9e
children ac2158e3e403
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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diff changeset
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
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24 #ifdef MECC
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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