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annotate libtomcrypt/src/encauth/ccm/ccm_done.c @ 1659:d32bcb5c557d

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Add Ed25519 support (#91) * Add support for Ed25519 as a public key type Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. OpenSSH key import and fuzzer are not supported yet. Initially inspired by Peter Szabo. * Add curve25519 and ed25519 fuzzers * Add import and export of Ed25519 keys
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Wed, 11 Mar 2020 21:09:45 +0500
parents 6dba84798cd5
children
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1471
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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 #include "tomcrypt.h"
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10
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11 #ifdef LTC_CCM_MODE
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12
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13 /**
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14 Terminate a CCM stream
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15 @param ccm The CCM state
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16 @param tag [out] The destination for the MAC tag
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17 @param taglen [in/out] The length of the MAC tag
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18 @return CRYPT_OK on success
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19 */
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20 int ccm_done(ccm_state *ccm,
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21 unsigned char *tag, unsigned long *taglen)
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22 {
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23 unsigned long x, y;
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24 int err;
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25
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26 LTC_ARGCHK(ccm != NULL);
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27
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28 /* Check all data have been processed */
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29 if (ccm->ptlen != ccm->current_ptlen) {
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30 return CRYPT_ERROR;
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31 }
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32
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33 LTC_ARGCHK(tag != NULL);
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34 LTC_ARGCHK(taglen != NULL);
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35
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36 if (ccm->x != 0) {
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37 if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->PAD, ccm->PAD, &ccm->K)) != CRYPT_OK) {
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38 return err;
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39 }
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40 }
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41
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42 /* setup CTR for the TAG (zero the count) */
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43 for (y = 15; y > 15 - ccm->L; y--) {
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44 ccm->ctr[y] = 0x00;
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45 }
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46 if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->ctr, ccm->CTRPAD, &ccm->K)) != CRYPT_OK) {
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47 return err;
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48 }
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49
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50 cipher_descriptor[ccm->cipher].done(&ccm->K);
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51
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52 /* store the TAG */
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53 for (x = 0; x < 16 && x < *taglen; x++) {
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54 tag[x] = ccm->PAD[x] ^ ccm->CTRPAD[x];
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55 }
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56 *taglen = x;
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57
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58 return CRYPT_OK;
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59 }
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60
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61 #endif
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62
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63 /* ref: $Format:%D$ */
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64 /* git commit: $Format:%H$ */
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65 /* commit time: $Format:%ai$ */