Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_ansi_x963_import.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
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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diff changeset
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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diff changeset
8 */
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9
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diff changeset
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_import.c
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19 ECC Crypto, Tom St Denis
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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20 */
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21
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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22 #ifdef LTC_MECC
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23
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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24 /** Import an ANSI X9.63 format public key
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25 @param in The input data to read
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26 @param inlen The length of the input data
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27 @param key [out] destination to store imported key \
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28 */
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29 int ecc_ansi_x963_import(const unsigned char *in, unsigned long inlen, ecc_key *key)
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30 {
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31 return ecc_ansi_x963_import_ex(in, inlen, key, NULL);
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32 }
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33
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34 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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35 {
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36 int x, err;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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37
382
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38 LTC_ARGCHK(in != NULL);
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39 LTC_ARGCHK(key != NULL);
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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40
382
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41 /* must be odd */
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42 if ((inlen & 1) == 0) {
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43 return CRYPT_INVALID_ARG;
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44 }
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45
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46 /* init key */
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47 if (mp_init_multi(&key->pubkey.x, &key->pubkey.y, &key->pubkey.z, &key->k, NULL) != CRYPT_OK) {
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48 return CRYPT_MEM;
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49 }
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50
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51 /* check for 4, 6 or 7 */
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52 if (in[0] != 4 && in[0] != 6 && in[0] != 7) {
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53 err = CRYPT_INVALID_PACKET;
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54 goto error;
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55 }
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56
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57 /* read data */
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58 if ((err = mp_read_unsigned_bin(key->pubkey.x, (unsigned char *)in+1, (inlen-1)>>1)) != CRYPT_OK) {
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59 goto error;
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60 }
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61
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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62 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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63 goto error;
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64 }
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65 if ((err = mp_set(key->pubkey.z, 1)) != CRYPT_OK) { goto error; }
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66
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67 if (dp == NULL) {
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68 /* determine the idx */
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diff changeset
69 for (x = 0; ltc_ecc_sets[x].size != 0; x++) {
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diff changeset
70 if ((unsigned)ltc_ecc_sets[x].size >= ((inlen-1)>>1)) {
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parents:
diff changeset
71 break;
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72 }
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73 }
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parents:
diff changeset
74 if (ltc_ecc_sets[x].size == 0) {
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parents:
diff changeset
75 err = CRYPT_INVALID_PACKET;
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diff changeset
76 goto error;
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77 }
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parents:
diff changeset
78 /* set the idx */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79 key->idx = x;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80 key->dp = &ltc_ecc_sets[x];
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diff changeset
81 } else {
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parents:
diff changeset
82 if (((inlen-1)>>1) != (unsigned long) dp->size) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83 err = CRYPT_INVALID_PACKET;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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parents:
diff changeset
84 goto error;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 key->idx = -1;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 key->dp = dp;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 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
90
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 /* we're done */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 return CRYPT_OK;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 error:
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 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
95 return err;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
100 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
101 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
102 /* commit time: $Format:%ai$ */