Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_export.c @ 774:e8b2ca448928

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Document escape chars
author Matt Johnston <matt@ucc.asn.au>
date Sun, 14 Apr 2013 23:08:57 +0800
parents 0cbe8f6dbf9e
children ac2158e3e403
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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