Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_done.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
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 *
382
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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_done.c
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14 GCM implementation, Terminate the stream, 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 Terminate a GCM stream
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22 @param gcm The GCM state
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23 @param tag [out] The destination for the MAC tag
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24 @param taglen [in/out] The length of the MAC tag
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25 @return CRYPT_OK on success
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26 */
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27 int gcm_done(gcm_state *gcm,
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28 unsigned char *tag, unsigned long *taglen)
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29 {
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30 unsigned long x;
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31 int err;
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32
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33 LTC_ARGCHK(gcm != NULL);
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34 LTC_ARGCHK(tag != NULL);
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35 LTC_ARGCHK(taglen != NULL);
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36
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37 if (gcm->buflen > 16 || gcm->buflen < 0) {
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38 return CRYPT_INVALID_ARG;
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39 }
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40
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41 if ((err = cipher_is_valid(gcm->cipher)) != CRYPT_OK) {
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42 return err;
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43 }
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45
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46 if (gcm->mode != GCM_MODE_TEXT) {
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47 return CRYPT_INVALID_ARG;
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48 }
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49
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50 /* handle remaining ciphertext */
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51 if (gcm->buflen) {
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52 gcm->pttotlen += gcm->buflen * CONST64(8);
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53 gcm_mult_h(gcm, gcm->X);
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54 }
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55
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56 /* length */
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57 STORE64H(gcm->totlen, gcm->buf);
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58 STORE64H(gcm->pttotlen, gcm->buf+8);
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59 for (x = 0; x < 16; x++) {
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60 gcm->X[x] ^= gcm->buf[x];
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61 }
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62 gcm_mult_h(gcm, gcm->X);
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63
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64 /* encrypt original counter */
382
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65 if ((err = cipher_descriptor[gcm->cipher].ecb_encrypt(gcm->Y_0, gcm->buf, &gcm->K)) != CRYPT_OK) {
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66 return err;
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67 }
285
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68 for (x = 0; x < 16 && x < *taglen; x++) {
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69 tag[x] = gcm->buf[x] ^ gcm->X[x];
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70 }
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71 *taglen = x;
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72
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73 cipher_descriptor[gcm->cipher].done(&gcm->K);
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74
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75 return CRYPT_OK;
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76 }
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78 #endif
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80
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81 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/gcm/gcm_done.c,v $ */
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82 /* $Revision: 1.9 $ */
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83 /* $Date: 2006/03/31 14:15:35 $ */