Mercurial > dropbear
annotate libtomcrypt/src/pk/ecc/ecc_ansi_x963_import.c @ 994:5c5ade336926
Prefer stronger algorithms in algorithm negotiation.
Prefer diffie-hellman-group14-sha1 (2048 bit) over
diffie-hellman-group1-sha1 (1024 bit).
Due to meet-in-the-middle attacks the effective key length of
three key 3DES is 112 bits. AES is stronger and faster then 3DES.
Prefer to delay the start of compression until after authentication
has completed. This avoids exposing compression code to attacks
from unauthenticated users.
(github pull request #9)
author | Fedor Brunner <fedor.brunner@azet.sk> |
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date | Fri, 23 Jan 2015 23:00:25 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
rev | line source |
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382
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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 * Tom St Denis, [email protected], http://libtomcrypt.com |
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10 */ |
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11 |
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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 |
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24 #ifdef MECC |
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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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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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71 for (x = 0; ltc_ecc_sets[x].size != 0; x++) { |
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72 if ((unsigned)ltc_ecc_sets[x].size >= ((inlen-1)>>1)) { |
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73 break; |
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74 } |
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75 } |
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76 if (ltc_ecc_sets[x].size == 0) { |
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77 err = CRYPT_INVALID_PACKET; |
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parents:
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78 goto error; |
0cbe8f6dbf9e
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parents:
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79 } |
0cbe8f6dbf9e
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parents:
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80 /* set the idx */ |
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Matt Johnston <matt@ucc.asn.au>
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81 key->idx = x; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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82 key->dp = <c_ecc_sets[x]; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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83 } else { |
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84 if (((inlen-1)>>1) != (unsigned long) dp->size) { |
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Matt Johnston <matt@ucc.asn.au>
parents:
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85 err = CRYPT_INVALID_PACKET; |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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86 goto error; |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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87 } |
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Matt Johnston <matt@ucc.asn.au>
parents:
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88 key->idx = -1; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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89 key->dp = dp; |
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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90 } |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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91 key->type = PK_PUBLIC; |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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92 |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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93 /* we're done */ |
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Matt Johnston <matt@ucc.asn.au>
parents:
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94 return CRYPT_OK; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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95 error: |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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96 mp_clear_multi(key->pubkey.x, key->pubkey.y, key->pubkey.z, key->k, NULL); |
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Matt Johnston <matt@ucc.asn.au>
parents:
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97 return err; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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98 } |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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99 |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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100 #endif |
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Matt Johnston <matt@ucc.asn.au>
parents:
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101 |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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102 /* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ecc_ansi_x963_import.c,v $ */ |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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103 /* $Revision: 1.9 $ */ |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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104 /* $Date: 2006/12/04 22:17:46 $ */ |