Mercurial > dropbear
annotate libtomcrypt/src/mac/xcbc/xcbc_init.c @ 1496:da3bed08607b
fix compile warnings
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 14 Feb 2018 23:09:28 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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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 /** |
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12 @file xcbc_init.c |
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13 XCBC Support, start an XCBC state |
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14 */ |
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15 |
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16 #ifdef LTC_XCBC |
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17 |
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18 /** Initialize XCBC-MAC state |
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19 @param xcbc [out] XCBC state to initialize |
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20 @param cipher Index of cipher to use |
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21 @param key [in] Secret key |
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22 @param keylen Length of secret key in octets |
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23 Return CRYPT_OK on success |
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24 */ |
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25 int xcbc_init(xcbc_state *xcbc, int cipher, const unsigned char *key, unsigned long keylen) |
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26 { |
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27 int x, y, err; |
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28 symmetric_key *skey; |
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29 unsigned long k1; |
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30 |
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31 LTC_ARGCHK(xcbc != NULL); |
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32 LTC_ARGCHK(key != NULL); |
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33 |
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34 /* schedule the key */ |
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35 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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36 return err; |
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37 } |
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38 |
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39 #ifdef LTC_FAST |
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40 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) { |
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41 return CRYPT_INVALID_ARG; |
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42 } |
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43 #endif |
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44 |
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45 skey = NULL; |
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46 |
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47 /* are we in pure XCBC mode with three keys? */ |
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48 if (keylen & LTC_XCBC_PURE) { |
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49 keylen &= ~LTC_XCBC_PURE; |
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50 |
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51 if (keylen < 2UL*cipher_descriptor[cipher].block_length) { |
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52 return CRYPT_INVALID_ARG; |
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53 } |
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54 |
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55 k1 = keylen - 2*cipher_descriptor[cipher].block_length; |
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56 XMEMCPY(xcbc->K[0], key, k1); |
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57 XMEMCPY(xcbc->K[1], key+k1, cipher_descriptor[cipher].block_length); |
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58 XMEMCPY(xcbc->K[2], key+k1 + cipher_descriptor[cipher].block_length, cipher_descriptor[cipher].block_length); |
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59 } else { |
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60 /* use the key expansion */ |
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61 k1 = cipher_descriptor[cipher].block_length; |
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62 |
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63 /* schedule the user key */ |
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64 skey = XCALLOC(1, sizeof(*skey)); |
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65 if (skey == NULL) { |
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66 return CRYPT_MEM; |
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67 } |
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68 |
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69 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, skey)) != CRYPT_OK) { |
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70 goto done; |
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71 } |
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72 |
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73 /* make the three keys */ |
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74 for (y = 0; y < 3; y++) { |
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75 for (x = 0; x < cipher_descriptor[cipher].block_length; x++) { |
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76 xcbc->K[y][x] = y + 1; |
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77 } |
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78 cipher_descriptor[cipher].ecb_encrypt(xcbc->K[y], xcbc->K[y], skey); |
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79 } |
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80 } |
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81 |
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82 /* setup K1 */ |
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83 err = cipher_descriptor[cipher].setup(xcbc->K[0], k1, 0, &xcbc->key); |
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84 |
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85 /* setup struct */ |
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86 zeromem(xcbc->IV, cipher_descriptor[cipher].block_length); |
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87 xcbc->blocksize = cipher_descriptor[cipher].block_length; |
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88 xcbc->cipher = cipher; |
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89 xcbc->buflen = 0; |
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90 done: |
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91 cipher_descriptor[cipher].done(skey); |
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92 if (skey != NULL) { |
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93 #ifdef LTC_CLEAN_STACK |
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94 zeromem(skey, sizeof(*skey)); |
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95 #endif |
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96 XFREE(skey); |
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97 } |
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98 return err; |
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99 } |
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100 |
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101 #endif |
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102 |
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103 /* ref: $Format:%D$ */ |
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104 /* git commit: $Format:%H$ */ |
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105 /* commit time: $Format:%ai$ */ |
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106 |