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annotate libtomcrypt/src/encauth/ccm/ccm_init.c @ 1493:72fd994fe7bd

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Update build instructions for localoptions, and tidy
author Matt Johnston <matt@ucc.asn.au>
date Wed, 14 Feb 2018 00:24:32 +0800
parents 6dba84798cd5
children
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1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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 Initialize a CCM state
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15 @param ccm The CCM state to initialize
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16 @param cipher The index of the cipher to use
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17 @param key The secret key
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18 @param keylen The length of the secret key
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19 @param ptlen The length of the plain/cipher text that will be processed
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20 @param taglen The max length of the MAC tag
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21 @param aadlen The length of the AAD
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22
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23 @return CRYPT_OK on success
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24 */
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25 int ccm_init(ccm_state *ccm, int cipher,
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26 const unsigned char *key, int keylen, int ptlen, int taglen, int aadlen)
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27 {
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28 int err;
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29
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30 LTC_ARGCHK(ccm != NULL);
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31 LTC_ARGCHK(key != NULL);
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32 LTC_ARGCHK(taglen != 0);
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33
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34 XMEMSET(ccm, 0, sizeof(ccm_state));
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35
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36 /* check cipher input */
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37 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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38 return err;
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39 }
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40 if (cipher_descriptor[cipher].block_length != 16) {
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41 return CRYPT_INVALID_CIPHER;
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42 }
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43
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44 /* make sure the taglen is even and <= 16 */
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45 ccm->taglen = taglen;
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46 ccm->taglen &= ~1;
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47 if (ccm->taglen > 16) {
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48 ccm->taglen = 16;
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49 }
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50
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51 /* can't use < 4 */
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52 if (ccm->taglen < 4) {
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53 return CRYPT_INVALID_ARG;
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54 }
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55
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56 /* schedule key */
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57 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &ccm->K)) != CRYPT_OK) {
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58 return err;
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59 }
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60 ccm->cipher = cipher;
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61
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62 /* let's get the L value */
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63 ccm->ptlen = ptlen;
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64 ccm->L = 0;
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65 while (ptlen) {
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66 ++ccm->L;
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67 ptlen >>= 8;
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68 }
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69 if (ccm->L <= 1) {
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70 ccm->L = 2;
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71 }
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72
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73 ccm->aadlen = aadlen;
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74 return CRYPT_OK;
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75 }
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76
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77 #endif
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78
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79 /* ref: $Format:%D$ */
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80 /* git commit: $Format:%H$ */
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81 /* commit time: $Format:%ai$ */