Mercurial > dropbear
annotate libtomcrypt/src/encauth/ccm/ccm_init.c @ 1870:0dcc5b0d93fa
Make re-exec work with "dropbearmulti dropbear"
The re-exec needs to know to use the dropbearmulti binary instead.
Add a test for this case.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 01 Feb 2022 22:18:23 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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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 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: $Format:%ai$ */ |