Mercurial > dropbear
annotate libtomcrypt/src/encauth/ccm/ccm_add_nonce.c @ 1905:77e5c8f778d3
Add build test with DEBUG_TRACE 5
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 24 Mar 2022 16:47:20 +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 Add nonce data to the CCM state |
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15 @param ccm The CCM state |
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16 @param nonce The nonce data to add |
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17 @param noncelen The length of the nonce |
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18 @return CRYPT_OK on success |
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19 */ |
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20 int ccm_add_nonce(ccm_state *ccm, |
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21 const unsigned char *nonce, unsigned long noncelen) |
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22 { |
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23 unsigned long x, y, len; |
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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 LTC_ARGCHK(nonce != NULL); |
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28 |
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29 /* increase L to match the nonce len */ |
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30 ccm->noncelen = (noncelen > 13) ? 13 : noncelen; |
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31 if ((15 - ccm->noncelen) > ccm->L) { |
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32 ccm->L = 15 - ccm->noncelen; |
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33 } |
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34 |
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35 /* decrease noncelen to match L */ |
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36 if ((ccm->noncelen + ccm->L) > 15) { |
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37 ccm->noncelen = 15 - ccm->L; |
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38 } |
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39 |
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40 /* form B_0 == flags | Nonce N | l(m) */ |
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41 x = 0; |
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42 ccm->PAD[x++] = (unsigned char)(((ccm->aadlen > 0) ? (1<<6) : 0) | |
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43 (((ccm->taglen - 2)>>1)<<3) | |
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44 (ccm->L-1)); |
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45 |
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46 /* nonce */ |
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47 for (y = 0; y < (16 - (ccm->L + 1)); y++) { |
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48 ccm->PAD[x++] = nonce[y]; |
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49 } |
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50 |
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51 /* store len */ |
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52 len = ccm->ptlen; |
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53 |
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54 /* shift len so the upper bytes of len are the contents of the length */ |
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55 for (y = ccm->L; y < 4; y++) { |
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56 len <<= 8; |
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57 } |
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58 |
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59 /* store l(m) (only store 32-bits) */ |
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60 for (y = 0; ccm->L > 4 && (ccm->L-y)>4; y++) { |
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61 ccm->PAD[x++] = 0; |
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62 } |
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63 for (; y < ccm->L; y++) { |
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64 ccm->PAD[x++] = (unsigned char)((len >> 24) & 255); |
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65 len <<= 8; |
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66 } |
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67 |
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68 /* encrypt PAD */ |
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69 if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->PAD, ccm->PAD, &ccm->K)) != CRYPT_OK) { |
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70 return err; |
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71 } |
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72 |
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73 /* handle header */ |
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74 ccm->x = 0; |
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75 if (ccm->aadlen > 0) { |
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76 /* store length */ |
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77 if (ccm->aadlen < ((1UL<<16) - (1UL<<8))) { |
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78 ccm->PAD[ccm->x++] ^= (ccm->aadlen>>8) & 255; |
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79 ccm->PAD[ccm->x++] ^= ccm->aadlen & 255; |
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80 } else { |
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81 ccm->PAD[ccm->x++] ^= 0xFF; |
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82 ccm->PAD[ccm->x++] ^= 0xFE; |
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83 ccm->PAD[ccm->x++] ^= (ccm->aadlen>>24) & 255; |
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84 ccm->PAD[ccm->x++] ^= (ccm->aadlen>>16) & 255; |
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85 ccm->PAD[ccm->x++] ^= (ccm->aadlen>>8) & 255; |
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86 ccm->PAD[ccm->x++] ^= ccm->aadlen & 255; |
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87 } |
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88 } |
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89 |
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90 /* setup the ctr counter */ |
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91 x = 0; |
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92 |
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93 /* flags */ |
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94 ccm->ctr[x++] = (unsigned char)ccm->L-1; |
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95 |
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96 /* nonce */ |
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97 for (y = 0; y < (16 - (ccm->L+1)); ++y) { |
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98 ccm->ctr[x++] = nonce[y]; |
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99 } |
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100 /* offset */ |
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101 while (x < 16) { |
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102 ccm->ctr[x++] = 0; |
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103 } |
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104 |
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105 ccm->CTRlen = 16; |
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106 return CRYPT_OK; |
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107 } |
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108 |
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109 #endif |
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110 |
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111 /* ref: $Format:%D$ */ |
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112 /* git commit: $Format:%H$ */ |
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113 /* commit time: $Format:%ai$ */ |