Mercurial > dropbear
annotate libtomcrypt/src/mac/xcbc/xcbc_init.c @ 1857:6022df862942
Use DSCP for IP QoS traffic classes
The previous TOS values are deprecated and not used by modern traffic
classifiers. This sets AF21 for "interactive" traffic (with a tty).
Non-tty traffic sets AF11 - that indicates high throughput but is not
lowest priority (which would be CS1 or LE).
This differs from the CS1 used by OpenSSH, it lets interactive git over SSH
have higher priority than background least effort traffic. Dropbear's settings
here should be suitable with the diffservs used by CAKE qdisc.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 25 Jan 2022 17:32:20 +0800 |
parents | 6dba84798cd5 |
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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 #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 |