Mercurial > dropbear
annotate libtomcrypt/src/mac/omac/omac_init.c @ 1620:572a7aefa188 bugfix
FIx remote forward listeners
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 07 Sep 2018 23:02:20 +0800 |
parents | 6dba84798cd5 |
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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 omac_init.c |
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13 OMAC1 support, initialize state, by Tom St Denis |
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14 */ |
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15 |
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16 |
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17 #ifdef LTC_OMAC |
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18 |
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19 /** |
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20 Initialize an OMAC state |
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21 @param omac The OMAC state to initialize |
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22 @param cipher The index of the desired cipher |
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23 @param key The secret key |
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24 @param keylen The length of the secret key (octets) |
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25 @return CRYPT_OK if successful |
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26 */ |
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27 int omac_init(omac_state *omac, int cipher, const unsigned char *key, unsigned long keylen) |
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28 { |
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29 int err, x, y, mask, msb, len; |
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30 |
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31 LTC_ARGCHK(omac != 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 /* now setup the system */ |
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46 switch (cipher_descriptor[cipher].block_length) { |
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47 case 8: mask = 0x1B; |
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48 len = 8; |
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49 break; |
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50 case 16: mask = 0x87; |
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51 len = 16; |
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52 break; |
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53 default: return CRYPT_INVALID_ARG; |
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54 } |
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55 |
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56 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &omac->key)) != CRYPT_OK) { |
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57 return err; |
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58 } |
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59 |
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60 /* ok now we need Lu and Lu^2 [calc one from the other] */ |
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61 |
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62 /* first calc L which is Ek(0) */ |
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63 zeromem(omac->Lu[0], cipher_descriptor[cipher].block_length); |
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64 if ((err = cipher_descriptor[cipher].ecb_encrypt(omac->Lu[0], omac->Lu[0], &omac->key)) != CRYPT_OK) { |
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65 return err; |
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66 } |
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67 |
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68 /* now do the mults, whoopy! */ |
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69 for (x = 0; x < 2; x++) { |
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70 /* if msb(L * u^(x+1)) = 0 then just shift, otherwise shift and xor constant mask */ |
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71 msb = omac->Lu[x][0] >> 7; |
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72 |
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73 /* shift left */ |
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74 for (y = 0; y < (len - 1); y++) { |
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75 omac->Lu[x][y] = ((omac->Lu[x][y] << 1) | (omac->Lu[x][y+1] >> 7)) & 255; |
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76 } |
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77 omac->Lu[x][len - 1] = ((omac->Lu[x][len - 1] << 1) ^ (msb ? mask : 0)) & 255; |
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78 |
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79 /* copy up as require */ |
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80 if (x == 0) { |
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81 XMEMCPY(omac->Lu[1], omac->Lu[0], sizeof(omac->Lu[0])); |
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82 } |
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83 } |
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84 |
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85 /* setup state */ |
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86 omac->cipher_idx = cipher; |
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87 omac->buflen = 0; |
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88 omac->blklen = len; |
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89 zeromem(omac->prev, sizeof(omac->prev)); |
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90 zeromem(omac->block, sizeof(omac->block)); |
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91 |
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92 return CRYPT_OK; |
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93 } |
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94 |
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95 #endif |
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96 |
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97 /* ref: $Format:%D$ */ |
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98 /* git commit: $Format:%H$ */ |
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99 /* commit time: $Format:%ai$ */ |