Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_ansi_x963_export.c @ 1734:73646de50f13 DROPBEAR_2020.80

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version 2020.80
author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 Jun 2020 21:45:59 +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: $Format:%ai$ */