Mercurial > dropbear
annotate libtomcrypt/src/mac/xcbc/xcbc_init.c @ 1449:ea150e3e95a6 fuzz
fix DROBPEAR_FUZZ auth delay
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 30 Jun 2017 21:10:57 +0800 |
parents | f849a5ca2efc |
children | 6dba84798cd5 |
rev | line source |
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382
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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 * Tom St Denis, [email protected], http://libtom.org |
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10 */ |
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11 #include "tomcrypt.h" |
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12 |
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13 /** |
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14 @file xcbc_init.c |
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15 XCBC Support, start an XCBC state |
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16 */ |
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17 |
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18 #ifdef LTC_XCBC |
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19 |
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20 /** Initialize XCBC-MAC state |
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21 @param xcbc [out] XCBC state to initialize |
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22 @param cipher Index of cipher to use |
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23 @param key [in] Secret key |
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24 @param keylen Length of secret key in octets |
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25 Return CRYPT_OK on success |
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26 */ |
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27 int xcbc_init(xcbc_state *xcbc, int cipher, const unsigned char *key, unsigned long keylen) |
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28 { |
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29 int x, y, err; |
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30 symmetric_key *skey; |
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31 unsigned long k1; |
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32 |
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33 LTC_ARGCHK(xcbc != NULL); |
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34 LTC_ARGCHK(key != NULL); |
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35 |
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36 /* schedule the key */ |
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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 |
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41 #ifdef LTC_FAST |
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42 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) { |
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43 return CRYPT_INVALID_ARG; |
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44 } |
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45 #endif |
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46 |
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47 skey = NULL; |
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48 |
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49 /* are we in pure XCBC mode with three keys? */ |
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50 if (keylen & LTC_XCBC_PURE) { |
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51 keylen &= ~LTC_XCBC_PURE; |
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52 |
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53 if (keylen < 2UL*cipher_descriptor[cipher].block_length) { |
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54 return CRYPT_INVALID_ARG; |
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55 } |
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56 |
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57 k1 = keylen - 2*cipher_descriptor[cipher].block_length; |
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58 XMEMCPY(xcbc->K[0], key, k1); |
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59 XMEMCPY(xcbc->K[1], key+k1, cipher_descriptor[cipher].block_length); |
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60 XMEMCPY(xcbc->K[2], key+k1 + cipher_descriptor[cipher].block_length, cipher_descriptor[cipher].block_length); |
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61 } else { |
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62 /* use the key expansion */ |
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63 k1 = cipher_descriptor[cipher].block_length; |
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64 |
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65 /* schedule the user key */ |
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66 skey = XCALLOC(1, sizeof(*skey)); |
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67 if (skey == NULL) { |
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68 return CRYPT_MEM; |
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69 } |
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70 |
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71 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, skey)) != CRYPT_OK) { |
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72 goto done; |
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73 } |
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74 |
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75 /* make the three keys */ |
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76 for (y = 0; y < 3; y++) { |
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77 for (x = 0; x < cipher_descriptor[cipher].block_length; x++) { |
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78 xcbc->K[y][x] = y + 1; |
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79 } |
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80 cipher_descriptor[cipher].ecb_encrypt(xcbc->K[y], xcbc->K[y], skey); |
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81 } |
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82 } |
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83 |
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84 /* setup K1 */ |
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85 err = cipher_descriptor[cipher].setup(xcbc->K[0], k1, 0, &xcbc->key); |
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86 |
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87 /* setup struct */ |
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88 zeromem(xcbc->IV, cipher_descriptor[cipher].block_length); |
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89 xcbc->blocksize = cipher_descriptor[cipher].block_length; |
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90 xcbc->cipher = cipher; |
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91 xcbc->buflen = 0; |
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92 done: |
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93 cipher_descriptor[cipher].done(skey); |
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94 if (skey != NULL) { |
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95 #ifdef LTC_CLEAN_STACK |
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96 zeromem(skey, sizeof(*skey)); |
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97 #endif |
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98 XFREE(skey); |
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99 } |
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100 return err; |
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101 } |
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102 |
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103 #endif |
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104 |
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105 /* $Source$ */ |
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106 /* $Revision$ */ |
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107 /* $Date$ */ |
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108 |