Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_export.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +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