Mercurial > dropbear
annotate libtomcrypt/src/encauth/ccm/ccm_process.c @ 1593:c8c20fb57a9a
Don't read uninitialised value.
From https://github.com/libtom/libtommath/commit/1d03522625f46214733e8e143a4765c01fc146f9
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 05 Mar 2018 16:50:24 +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 Process plaintext/ciphertext through CCM |
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15 @param ccm The CCM state |
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16 @param pt The plaintext |
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17 @param ptlen The plaintext length (ciphertext length is the same) |
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18 @param ct The ciphertext |
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19 @param direction Encrypt or Decrypt mode (CCM_ENCRYPT or CCM_DECRYPT) |
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20 @return CRYPT_OK on success |
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21 */ |
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22 int ccm_process(ccm_state *ccm, |
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23 unsigned char *pt, unsigned long ptlen, |
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24 unsigned char *ct, |
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25 int direction) |
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26 { |
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27 unsigned char z, b; |
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28 unsigned long y; |
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29 int err; |
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30 |
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31 LTC_ARGCHK(ccm != NULL); |
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32 |
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33 /* Check aad has been correctly added */ |
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34 if (ccm->aadlen != ccm->current_aadlen) { |
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35 return CRYPT_ERROR; |
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36 } |
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37 |
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38 /* Check we do not process too much data */ |
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39 if (ccm->ptlen < ccm->current_ptlen + ptlen) { |
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40 return CRYPT_ERROR; |
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41 } |
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42 ccm->current_ptlen += ptlen; |
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43 |
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44 /* now handle the PT */ |
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45 if (ptlen > 0) { |
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46 LTC_ARGCHK(pt != NULL); |
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47 LTC_ARGCHK(ct != NULL); |
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48 |
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49 for (y = 0; y < ptlen; y++) { |
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50 /* increment the ctr? */ |
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51 if (ccm->CTRlen == 16) { |
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52 for (z = 15; z > 15-ccm->L; z--) { |
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53 ccm->ctr[z] = (ccm->ctr[z] + 1) & 255; |
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54 if (ccm->ctr[z]) break; |
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55 } |
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56 if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->ctr, ccm->CTRPAD, &ccm->K)) != CRYPT_OK) { |
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57 return err; |
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58 } |
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59 ccm->CTRlen = 0; |
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60 } |
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61 |
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62 /* if we encrypt we add the bytes to the MAC first */ |
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63 if (direction == CCM_ENCRYPT) { |
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64 b = pt[y]; |
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65 ct[y] = b ^ ccm->CTRPAD[ccm->CTRlen++]; |
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66 } else { |
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67 b = ct[y] ^ ccm->CTRPAD[ccm->CTRlen++]; |
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68 pt[y] = b; |
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69 } |
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70 |
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71 if (ccm->x == 16) { |
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72 if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->PAD, ccm->PAD, &ccm->K)) != CRYPT_OK) { |
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73 return err; |
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74 } |
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75 ccm->x = 0; |
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76 } |
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77 ccm->PAD[ccm->x++] ^= b; |
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78 } |
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79 } |
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80 |
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81 return CRYPT_OK; |
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82 } |
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83 |
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84 #endif |
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85 |
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86 /* ref: $Format:%D$ */ |
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87 /* git commit: $Format:%H$ */ |
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88 /* commit time: $Format:%ai$ */ |