Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_shared_secret.c @ 476:df7f7da7f6e4 pubkey-options

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- Rework pubkey options to be more careful about buffer lengths. Needs review.
author Matt Johnston <matt@ucc.asn.au>
date Fri, 12 Sep 2008 17:23:56 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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diff changeset
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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diff changeset
5 *
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6 * The library is free for all purposes without any express
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diff changeset
7 * guarantee it works.
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8 *
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diff changeset
9 * Tom St Denis, [email protected], http://libtomcrypt.com
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diff changeset
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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diff changeset
13 *
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diff changeset
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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diff changeset
16 */
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diff changeset
17 #include "tomcrypt.h"
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18
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diff changeset
19 /**
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diff changeset
20 @file ecc_shared_secret.c
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diff changeset
21 ECC Crypto, Tom St Denis
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22 */
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23
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24 #ifdef MECC
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25
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
26 /**
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diff changeset
27 Create an ECC shared secret between two keys
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28 @param private_key The private ECC key
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diff changeset
29 @param public_key The public key
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Matt Johnston <matt@ucc.asn.au>
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30 @param out [out] Destination of the shared secret (Conforms to EC-DH from ANSI X9.63)
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31 @param outlen [in/out] The max size and resulting size of the shared secret
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32 @return CRYPT_OK if successful
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33 */
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34 int ecc_shared_secret(ecc_key *private_key, ecc_key *public_key,
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35 unsigned char *out, unsigned long *outlen)
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36 {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
37 unsigned long x;
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Matt Johnston <matt@ucc.asn.au>
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38 ecc_point *result;
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39 void *prime;
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40 int err;
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41
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42 LTC_ARGCHK(private_key != NULL);
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43 LTC_ARGCHK(public_key != NULL);
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44 LTC_ARGCHK(out != NULL);
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45 LTC_ARGCHK(outlen != NULL);
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46
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47 /* type valid? */
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48 if (private_key->type != PK_PRIVATE) {
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49 return CRYPT_PK_NOT_PRIVATE;
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50 }
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51
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
52 if (ltc_ecc_is_valid_idx(private_key->idx) == 0 || ltc_ecc_is_valid_idx(public_key->idx) == 0) {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
53 return CRYPT_INVALID_ARG;
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54 }
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55
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
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56 if (XSTRCMP(private_key->dp->name, public_key->dp->name) != 0) {
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Matt Johnston <matt@ucc.asn.au>
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57 return CRYPT_PK_TYPE_MISMATCH;
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58 }
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59
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diff changeset
60 /* make new point */
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diff changeset
61 result = ltc_ecc_new_point();
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62 if (result == NULL) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
63 return CRYPT_MEM;
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64 }
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65
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
66 if ((err = mp_init(&prime)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
67 ltc_ecc_del_point(result);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
68 return err;
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Matt Johnston <matt@ucc.asn.au>
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69 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
70
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
71 if ((err = mp_read_radix(prime, (char *)private_key->dp->prime, 16)) != CRYPT_OK) { goto done; }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
72 if ((err = ltc_mp.ecc_ptmul(private_key->k, &public_key->pubkey, result, prime, 1)) != CRYPT_OK) { goto done; }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
73
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
74 x = (unsigned long)mp_unsigned_bin_size(prime);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75 if (*outlen < x) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
76 *outlen = x;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
77 err = CRYPT_BUFFER_OVERFLOW;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
78 goto done;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80 zeromem(out, x);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
81 if ((err = mp_to_unsigned_bin(result->x, out + (x - mp_unsigned_bin_size(result->x)))) != CRYPT_OK) { goto done; }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
82
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83 err = CRYPT_OK;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 *outlen = x;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 done:
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 mp_clear(prime);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 ltc_ecc_del_point(result);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 return err;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 }
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 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 /* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ecc_shared_secret.c,v $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 /* $Revision: 1.8 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 /* $Date: 2006/12/04 02:19:48 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95