Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_ansi_x963_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_ansi_x963_export.c
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19 ECC Crypto, Tom St Denis
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20 */
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21
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22 #ifdef LTC_MECC
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23
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24 /** ECC X9.63 (Sec. 4.3.6) uncompressed export
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25 @param key Key to export
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26 @param out [out] destination of export
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27 @param outlen [in/out] Length of destination and final output size
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28 Return CRYPT_OK on success
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29 */
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30 int ecc_ansi_x963_export(ecc_key *key, unsigned char *out, unsigned long *outlen)
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31 {
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32 unsigned char buf[ECC_BUF_SIZE];
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33 unsigned long numlen, xlen, ylen;
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34
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35 LTC_ARGCHK(key != NULL);
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36 LTC_ARGCHK(outlen != NULL);
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37
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38 if (ltc_ecc_is_valid_idx(key->idx) == 0) {
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39 return CRYPT_INVALID_ARG;
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40 }
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41 numlen = key->dp->size;
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42 xlen = mp_unsigned_bin_size(key->pubkey.x);
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43 ylen = mp_unsigned_bin_size(key->pubkey.y);
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44
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45 if (xlen > numlen || ylen > numlen || sizeof(buf) < numlen) {
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46 return CRYPT_BUFFER_OVERFLOW;
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47 }
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48
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49 if (*outlen < (1 + 2*numlen)) {
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50 *outlen = 1 + 2*numlen;
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51 return CRYPT_BUFFER_OVERFLOW;
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52 }
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53
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54 LTC_ARGCHK(out != NULL);
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55
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56 /* store byte 0x04 */
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57 out[0] = 0x04;
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58
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59 /* pad and store x */
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60 zeromem(buf, sizeof(buf));
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61 mp_to_unsigned_bin(key->pubkey.x, buf + (numlen - xlen));
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62 XMEMCPY(out+1, buf, numlen);
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63
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64 /* pad and store y */
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65 zeromem(buf, sizeof(buf));
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66 mp_to_unsigned_bin(key->pubkey.y, buf + (numlen - ylen));
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67 XMEMCPY(out+1+numlen, buf, numlen);
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68
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69 *outlen = 1 + 2*numlen;
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70 return CRYPT_OK;
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71 }
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72
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73 #endif
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74
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75 /* ref: $Format:%D$ */
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76 /* git commit: $Format:%H$ */
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77 /* commit time: $Format:%ai$ */