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annotate libtomcrypt/src/encauth/ccm/ccm_add_nonce.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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rev   line source
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: $Format:%ai$ */