1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis */
2 /* SPDX-License-Identifier: Unlicense */
3
4 #include "tomcrypt_private.h"
5
6 /**
7 @file ecc_ansi_x963_import.c
8 ECC Crypto, Tom St Denis
9 */
10
11 #ifdef LTC_MECC
12
13 /** Import an ANSI X9.63 format public key
14 @param in The input data to read
15 @param inlen The length of the input data
16 @param key [out] destination to store imported key \
17 */
ecc_ansi_x963_import(const unsigned char * in,unsigned long inlen,ecc_key * key)18 int ecc_ansi_x963_import(const unsigned char *in, unsigned long inlen, ecc_key *key)
19 {
20 return ecc_ansi_x963_import_ex(in, inlen, key, NULL);
21 }
22
ecc_ansi_x963_import_ex(const unsigned char * in,unsigned long inlen,ecc_key * key,const ltc_ecc_curve * cu)23 int ecc_ansi_x963_import_ex(const unsigned char *in, unsigned long inlen, ecc_key *key, const ltc_ecc_curve *cu)
24 {
25 int err;
26
27 LTC_ARGCHK(in != NULL);
28 LTC_ARGCHK(key != NULL);
29
30 /* must be odd */
31 if ((inlen & 1) == 0) {
32 return CRYPT_INVALID_ARG;
33 }
34
35 /* initialize key->dp */
36 if (cu == NULL) {
37 /* this case works only for uncompressed public keys */
38 if ((err = ecc_set_curve_by_size((inlen-1)>>1, key)) != CRYPT_OK) { return err; }
39 }
40 else {
41 /* this one works for both compressed / uncompressed pubkeys */
42 if ((err = ecc_set_curve(cu, key)) != CRYPT_OK) { return err; }
43 }
44
45 /* load public key */
46 if ((err = ecc_set_key((unsigned char *)in, inlen, PK_PUBLIC, key)) != CRYPT_OK) { return err; }
47
48 /* we're done */
49 return CRYPT_OK;
50 }
51
52 #endif
53