Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_export.c @ 1711:e9dba7abd939

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Merge libtomcrypt v1.18.2
author Matt Johnston <matt@ucc.asn.au>
date Wed, 10 Jun 2020 23:16:13 +0800
parents 6dba84798cd5
children
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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: $Format:%ai$ */
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80