Mercurial > dropbear
annotate libtomcrypt/src/pk/katja/katja_make_key.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 #include "tomcrypt.h" |
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12 |
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13 /** |
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14 @file katja_make_key.c |
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15 Katja key generation, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef MKAT |
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19 |
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20 /** |
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21 Create a Katja key |
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22 @param prng An active PRNG state |
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23 @param wprng The index of the PRNG desired |
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24 @param size The size of the modulus (key size) desired (octets) |
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25 @param key [out] Destination of a newly created private key pair |
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26 @return CRYPT_OK if successful, upon error all allocated ram is freed |
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27 */ |
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28 int katja_make_key(prng_state *prng, int wprng, int size, katja_key *key) |
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29 { |
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30 void *p, *q, *tmp1, *tmp2; |
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31 int err; |
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32 |
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33 LTC_ARGCHK(key != NULL); |
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34 LTC_ARGCHK(ltc_mp.name != NULL); |
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35 |
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36 if ((size < (MIN_KAT_SIZE/8)) || (size > (MAX_KAT_SIZE/8))) { |
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37 return CRYPT_INVALID_KEYSIZE; |
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38 } |
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39 |
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40 if ((err = prng_is_valid(wprng)) != CRYPT_OK) { |
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41 return err; |
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42 } |
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43 |
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44 if ((err = mp_init_multi(&p, &q, &tmp1, &tmp2, NULL)) != CRYPT_OK) { |
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45 return err; |
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46 } |
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47 |
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48 /* divide size by three */ |
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49 size = (((size << 3) / 3) + 7) >> 3; |
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50 |
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51 /* make prime "q" (we negate size to make q == 3 mod 4) */ |
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52 if ((err = rand_prime(q, -size, prng, wprng)) != CRYPT_OK) { goto done; } |
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53 if ((err = mp_sub_d(q, 1, tmp1)) != CRYPT_OK) { goto done; } |
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54 |
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55 /* make prime "p" */ |
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56 do { |
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57 if ((err = rand_prime(p, size+1, prng, wprng)) != CRYPT_OK) { goto done; } |
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58 if ((err = mp_gcd(p, tmp1, tmp2)) != CRYPT_OK) { goto done; } |
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59 } while (mp_cmp_d(tmp2, 1) != LTC_MP_EQ); |
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60 |
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61 /* make key */ |
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62 if ((err = mp_init_multi(&key->d, &key->N, &key->dQ, &key->dP, |
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63 &key->qP, &key->p, &key->q, &key->pq, NULL)) != CRYPT_OK) { |
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64 goto error; |
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65 } |
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66 |
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67 /* n=p^2q and 1/n mod pq */ |
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68 if ((err = mp_copy( p, key->p)) != CRYPT_OK) { goto error2; } |
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69 if ((err = mp_copy( q, key->q)) != CRYPT_OK) { goto error2; } |
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70 if ((err = mp_mul(key->p, key->q, key->pq)) != CRYPT_OK) { goto error2; } /* tmp1 = pq */ |
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71 if ((err = mp_mul(key->pq, key->p, key->N)) != CRYPT_OK) { goto error2; } /* N = p^2q */ |
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72 if ((err = mp_sub_d( p, 1, tmp1)) != CRYPT_OK) { goto error2; } /* tmp1 = q-1 */ |
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73 if ((err = mp_sub_d( q, 1, tmp2)) != CRYPT_OK) { goto error2; } /* tmp2 = p-1 */ |
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74 if ((err = mp_lcm(tmp1, tmp2, key->d)) != CRYPT_OK) { goto error2; } /* tmp1 = lcd(p-1,q-1) */ |
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75 if ((err = mp_invmod( key->N, key->d, key->d)) != CRYPT_OK) { goto error2; } /* key->d = 1/N mod pq */ |
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76 |
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77 /* optimize for CRT now */ |
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78 /* find d mod q-1 and d mod p-1 */ |
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79 if ((err = mp_mod( key->d, tmp1, key->dP)) != CRYPT_OK) { goto error2; } /* dP = d mod p-1 */ |
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80 if ((err = mp_mod( key->d, tmp2, key->dQ)) != CRYPT_OK) { goto error2; } /* dQ = d mod q-1 */ |
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81 if ((err = mp_invmod( q, p, key->qP)) != CRYPT_OK) { goto error2; } /* qP = 1/q mod p */ |
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82 |
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83 /* set key type (in this case it's CRT optimized) */ |
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84 key->type = PK_PRIVATE; |
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85 |
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86 /* return ok and free temps */ |
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87 err = CRYPT_OK; |
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88 goto done; |
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89 error2: |
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Matt Johnston <matt@ucc.asn.au>
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90 mp_clear_multi( key->d, key->N, key->dQ, key->dP, key->qP, key->p, key->q, key->pq, NULL); |
0cbe8f6dbf9e
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91 error: |
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Matt Johnston <matt@ucc.asn.au>
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92 done: |
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Matt Johnston <matt@ucc.asn.au>
parents:
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93 mp_clear_multi( tmp2, tmp1, p, q, NULL); |
0cbe8f6dbf9e
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94 return err; |
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95 } |
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96 |
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97 #endif |
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98 |
0cbe8f6dbf9e
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99 /* $Source: /cvs/libtom/libtomcrypt/src/pk/katja/katja_make_key.c,v $ */ |
0cbe8f6dbf9e
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100 /* $Revision: 1.10 $ */ |
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101 /* $Date: 2006/03/31 14:15:35 $ */ |