Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_add_iv.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
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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 /**
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13 @file gcm_add_iv.c
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14 GCM implementation, add IV data to the state, by Tom St Denis
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15 */
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16 #include "tomcrypt.h"
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17
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18 #ifdef GCM_MODE
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19
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20 /**
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21 Add IV data to the GCM state
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22 @param gcm The GCM state
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23 @param IV The initial value data to add
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24 @param IVlen The length of the IV
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25 @return CRYPT_OK on success
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26 */
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27 int gcm_add_iv(gcm_state *gcm,
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28 const unsigned char *IV, unsigned long IVlen)
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29 {
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30 unsigned long x, y;
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31 int err;
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33 LTC_ARGCHK(gcm != NULL);
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34 if (IVlen > 0) {
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35 LTC_ARGCHK(IV != NULL);
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36 }
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37
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38 /* must be in IV mode */
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39 if (gcm->mode != GCM_MODE_IV) {
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40 return CRYPT_INVALID_ARG;
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41 }
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43 if (gcm->buflen >= 16 || gcm->buflen < 0) {
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44 return CRYPT_INVALID_ARG;
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45 }
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47 if ((err = cipher_is_valid(gcm->cipher)) != CRYPT_OK) {
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48 return err;
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49 }
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51
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52 /* trip the ivmode flag */
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53 if (IVlen + gcm->buflen > 12) {
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54 gcm->ivmode |= 1;
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55 }
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56
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57 x = 0;
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58 #ifdef LTC_FAST
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59 if (gcm->buflen == 0) {
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60 for (x = 0; x < (IVlen & ~15); x += 16) {
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61 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
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62 *((LTC_FAST_TYPE*)(&gcm->X[y])) ^= *((LTC_FAST_TYPE*)(&IV[x + y]));
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63 }
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64 gcm_mult_h(gcm, gcm->X);
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65 gcm->totlen += 128;
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66 }
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67 IV += x;
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68 }
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69 #endif
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70
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71 /* start adding IV data to the state */
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72 for (; x < IVlen; x++) {
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73 gcm->buf[gcm->buflen++] = *IV++;
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74
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75 if (gcm->buflen == 16) {
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76 /* GF mult it */
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77 for (y = 0; y < 16; y++) {
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78 gcm->X[y] ^= gcm->buf[y];
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79 }
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80 gcm_mult_h(gcm, gcm->X);
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81 gcm->buflen = 0;
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82 gcm->totlen += 128;
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83 }
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84 }
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85
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86 return CRYPT_OK;
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87 }
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88
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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89 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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91
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/gcm/gcm_add_iv.c,v $ */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
93 /* $Revision: 1.7 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
94 /* $Date: 2006/03/31 14:15:35 $ */