Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_done.c @ 1520:84578193ef47

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draft CHANGES
author Matt Johnston <matt@ucc.asn.au>
date Sun, 18 Feb 2018 23:48:32 +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 */
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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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38
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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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62
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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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84
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85 #endif
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87
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88 /* ref: $Format:%D$ */
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89 /* git commit: $Format:%H$ */
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90 /* commit time: $Format:%ai$ */