Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_import.c @ 994:5c5ade336926

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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>
date Fri, 23 Jan 2015 23:00:25 +0800
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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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_import.c
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15 Import a PKCS-style Katja key, 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 Import an KatjaPublicKey or KatjaPrivateKey [two-prime only, only support >= 1024-bit keys, defined in PKCS #1 v2.1]
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22 @param in The packet to import from
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23 @param inlen It's length (octets)
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24 @param key [out] Destination for newly imported key
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25 @return CRYPT_OK if successful, upon error allocated memory is freed
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26 */
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27 int katja_import(const unsigned char *in, unsigned long inlen, katja_key *key)
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28 {
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29 int err;
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30 void *zero;
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31
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32 LTC_ARGCHK(in != NULL);
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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 /* init key */
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37 if ((err = mp_init_multi(&zero, &key->d, &key->N, &key->dQ,
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38 &key->dP, &key->qP, &key->p, &key->q, &key->pq, NULL)) != CRYPT_OK) {
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39 return err;
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40 }
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41
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42 if ((err = der_decode_sequence_multi(in, inlen,
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43 LTC_ASN1_INTEGER, 1UL, key->N,
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44 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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45 goto LBL_ERR;
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46 }
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47
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48 if (mp_cmp_d(key->N, 0) == LTC_MP_EQ) {
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49 /* it's a private key */
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50 if ((err = der_decode_sequence_multi(in, inlen,
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51 LTC_ASN1_INTEGER, 1UL, zero,
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52 LTC_ASN1_INTEGER, 1UL, key->N,
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53 LTC_ASN1_INTEGER, 1UL, key->d,
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54 LTC_ASN1_INTEGER, 1UL, key->p,
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55 LTC_ASN1_INTEGER, 1UL, key->q,
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56 LTC_ASN1_INTEGER, 1UL, key->dP,
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57 LTC_ASN1_INTEGER, 1UL, key->dQ,
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58 LTC_ASN1_INTEGER, 1UL, key->qP,
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59 LTC_ASN1_INTEGER, 1UL, key->pq,
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60 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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61 goto LBL_ERR;
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62 }
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63 key->type = PK_PRIVATE;
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64 } else {
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65 /* public we have N */
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66 key->type = PK_PUBLIC;
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67 }
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68 mp_clear(zero);
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69 return CRYPT_OK;
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70 LBL_ERR:
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71 mp_clear_multi(zero, key->d, key->N, key->dQ, key->dP,
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72 key->qP, key->p, key->q, key->pq, NULL);
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73 return err;
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74 }
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75
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76 #endif /* MRSA */
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77
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78
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79 /* $Source: /cvs/libtom/libtomcrypt/src/pk/katja/katja_import.c,v $ */
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80 /* $Revision: 1.3 $ */
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81 /* $Date: 2006/03/31 14:15:35 $ */