Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_ansi_x963_import.c @ 1461:fb90a5ba84e0

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Merge pull request #49 from fperrad/20170812_lint Some linting, const parameters
author Matt Johnston <matt@ucc.asn.au>
date Thu, 25 Jan 2018 21:55:25 +0800
parents f849a5ca2efc
children 6dba84798cd5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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diff changeset
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 *
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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diff changeset
9 * Tom St Denis, [email protected], http://libtom.org
382
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10 */
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11
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diff changeset
12 /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b
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13 *
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14 * All curves taken from NIST recommendation paper of July 1999
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15 * Available at http://csrc.nist.gov/cryptval/dss.htm
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16 */
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17 #include "tomcrypt.h"
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18
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19 /**
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20 @file ecc_ansi_x963_import.c
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21 ECC Crypto, Tom St Denis
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22 */
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23
1435
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24 #ifdef LTC_MECC
382
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25
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26 /** Import an ANSI X9.63 format public key
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27 @param in The input data to read
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28 @param inlen The length of the input data
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29 @param key [out] destination to store imported key \
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30 */
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31 int ecc_ansi_x963_import(const unsigned char *in, unsigned long inlen, ecc_key *key)
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32 {
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33 return ecc_ansi_x963_import_ex(in, inlen, key, NULL);
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34 }
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35
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36 int ecc_ansi_x963_import_ex(const unsigned char *in, unsigned long inlen, ecc_key *key, ltc_ecc_set_type *dp)
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37 {
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38 int x, err;
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39
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40 LTC_ARGCHK(in != NULL);
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41 LTC_ARGCHK(key != NULL);
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42
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43 /* must be odd */
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44 if ((inlen & 1) == 0) {
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45 return CRYPT_INVALID_ARG;
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46 }
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47
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48 /* init key */
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49 if (mp_init_multi(&key->pubkey.x, &key->pubkey.y, &key->pubkey.z, &key->k, NULL) != CRYPT_OK) {
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50 return CRYPT_MEM;
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51 }
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52
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53 /* check for 4, 6 or 7 */
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54 if (in[0] != 4 && in[0] != 6 && in[0] != 7) {
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55 err = CRYPT_INVALID_PACKET;
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56 goto error;
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57 }
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58
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59 /* read data */
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60 if ((err = mp_read_unsigned_bin(key->pubkey.x, (unsigned char *)in+1, (inlen-1)>>1)) != CRYPT_OK) {
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61 goto error;
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62 }
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63
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diff changeset
64 if ((err = mp_read_unsigned_bin(key->pubkey.y, (unsigned char *)in+1+((inlen-1)>>1), (inlen-1)>>1)) != CRYPT_OK) {
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65 goto error;
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66 }
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67 if ((err = mp_set(key->pubkey.z, 1)) != CRYPT_OK) { goto error; }
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68
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69 if (dp == NULL) {
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70 /* determine the idx */
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parents:
diff changeset
71 for (x = 0; ltc_ecc_sets[x].size != 0; x++) {
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diff changeset
72 if ((unsigned)ltc_ecc_sets[x].size >= ((inlen-1)>>1)) {
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parents:
diff changeset
73 break;
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diff changeset
74 }
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75 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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parents:
diff changeset
76 if (ltc_ecc_sets[x].size == 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
77 err = CRYPT_INVALID_PACKET;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
78 goto error;
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parents:
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79 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80 /* set the idx */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
81 key->idx = x;
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parents:
diff changeset
82 key->dp = &ltc_ecc_sets[x];
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parents:
diff changeset
83 } else {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 if (((inlen-1)>>1) != (unsigned long) dp->size) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 err = CRYPT_INVALID_PACKET;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 goto error;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 key->idx = -1;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 key->dp = dp;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 key->type = PK_PUBLIC;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 /* we're done */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 return CRYPT_OK;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 error:
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 mp_clear_multi(key->pubkey.x, key->pubkey.y, key->pubkey.z, key->k, NULL);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 return err;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
102 /* $Source$ */
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
103 /* $Revision$ */
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
104 /* $Date$ */