Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_done.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 6dba84798cd5
children
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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
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10 /**
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11 @file gcm_done.c
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12 GCM implementation, Terminate the stream, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
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16 #ifdef LTC_GCM_MODE
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18 /**
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19 Terminate a GCM stream
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20 @param gcm The GCM state
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21 @param tag [out] The destination for the MAC tag
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22 @param taglen [in/out] The length of the MAC tag
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23 @return CRYPT_OK on success
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24 */
1471
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25 int gcm_done(gcm_state *gcm,
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26 unsigned char *tag, unsigned long *taglen)
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27 {
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28 unsigned long x;
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29 int err;
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30
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31 LTC_ARGCHK(gcm != NULL);
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32 LTC_ARGCHK(tag != NULL);
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33 LTC_ARGCHK(taglen != NULL);
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34
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35 if (gcm->buflen > 16 || gcm->buflen < 0) {
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36 return CRYPT_INVALID_ARG;
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37 }
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39 if ((err = cipher_is_valid(gcm->cipher)) != CRYPT_OK) {
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40 return err;
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41 }
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42
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43 if (gcm->mode == LTC_GCM_MODE_IV) {
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44 /* let's process the IV */
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45 if ((err = gcm_add_aad(gcm, NULL, 0)) != CRYPT_OK) return err;
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46 }
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47
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48 if (gcm->mode == LTC_GCM_MODE_AAD) {
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49 /* let's process the AAD */
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50 if ((err = gcm_process(gcm, NULL, 0, NULL, 0)) != CRYPT_OK) return err;
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51 }
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52
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53 if (gcm->mode != LTC_GCM_MODE_TEXT) {
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54 return CRYPT_INVALID_ARG;
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55 }
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56
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57 /* handle remaining ciphertext */
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58 if (gcm->buflen) {
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59 gcm->pttotlen += gcm->buflen * CONST64(8);
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60 gcm_mult_h(gcm, gcm->X);
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61 }
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63 /* length */
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64 STORE64H(gcm->totlen, gcm->buf);
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65 STORE64H(gcm->pttotlen, gcm->buf+8);
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66 for (x = 0; x < 16; x++) {
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67 gcm->X[x] ^= gcm->buf[x];
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68 }
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69 gcm_mult_h(gcm, gcm->X);
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70
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71 /* encrypt original counter */
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72 if ((err = cipher_descriptor[gcm->cipher].ecb_encrypt(gcm->Y_0, gcm->buf, &gcm->K)) != CRYPT_OK) {
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73 return err;
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74 }
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75 for (x = 0; x < 16 && x < *taglen; x++) {
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76 tag[x] = gcm->buf[x] ^ gcm->X[x];
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77 }
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78 *taglen = x;
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79
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80 cipher_descriptor[gcm->cipher].done(&gcm->K);
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81
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82 return CRYPT_OK;
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83 }
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85 #endif
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87
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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88 /* ref: $Format:%D$ */
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89 /* git commit: $Format:%H$ */
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90 /* commit time: $Format:%ai$ */