Mercurial > dropbear
annotate libtomcrypt/src/modes/ctr/ctr_start.c @ 1156:a8f4dade70e5
avoid getpass when not used
some systems (like android's bionic) do not provide getpass. you can
disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid
its use (and rely on pubkey auth), but the link still fails because
the support file calls getpass. do not define this func if both of
those auth methods are not used.
author | Mike Frysinger <vapier@gentoo.org> |
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date | Wed, 21 Oct 2015 22:39:55 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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 * Tom St Denis, [email protected], http://libtomcrypt.com |
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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 ctr_start.c |
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15 CTR implementation, start chain, Tom St Denis |
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16 */ |
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17 |
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18 |
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19 #ifdef LTC_CTR_MODE |
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20 |
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21 /** |
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22 Initialize a CTR context |
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23 @param cipher The index of the cipher desired |
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24 @param IV The initial vector |
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25 @param key The secret key |
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26 @param keylen The length of the secret key (octets) |
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27 @param num_rounds Number of rounds in the cipher desired (0 for default) |
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28 @param ctr_mode The counter mode (CTR_COUNTER_LITTLE_ENDIAN or CTR_COUNTER_BIG_ENDIAN) |
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29 @param ctr The CTR state to initialize |
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30 @return CRYPT_OK if successful |
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31 */ |
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32 int ctr_start( int cipher, |
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33 const unsigned char *IV, |
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34 const unsigned char *key, int keylen, |
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35 int num_rounds, int ctr_mode, |
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36 symmetric_CTR *ctr) |
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37 { |
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38 int x, err; |
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39 |
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40 LTC_ARGCHK(IV != NULL); |
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41 LTC_ARGCHK(key != NULL); |
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42 LTC_ARGCHK(ctr != NULL); |
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43 |
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44 /* bad param? */ |
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45 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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46 return err; |
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47 } |
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48 |
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49 /* setup cipher */ |
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50 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ctr->key)) != CRYPT_OK) { |
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51 return err; |
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52 } |
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53 |
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54 /* copy ctr */ |
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55 ctr->blocklen = cipher_descriptor[cipher].block_length; |
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56 ctr->cipher = cipher; |
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57 ctr->padlen = 0; |
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58 ctr->mode = ctr_mode & 1; |
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59 for (x = 0; x < ctr->blocklen; x++) { |
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60 ctr->ctr[x] = IV[x]; |
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61 } |
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62 |
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63 if (ctr_mode & LTC_CTR_RFC3686) { |
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64 /* increment the IV as per RFC 3686 */ |
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65 if (ctr->mode == CTR_COUNTER_LITTLE_ENDIAN) { |
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66 /* little-endian */ |
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67 for (x = 0; x < ctr->blocklen; x++) { |
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68 ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255; |
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69 if (ctr->ctr[x] != (unsigned char)0) { |
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70 break; |
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71 } |
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72 } |
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73 } else { |
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74 /* big-endian */ |
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75 for (x = ctr->blocklen-1; x >= 0; x--) { |
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76 ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255; |
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77 if (ctr->ctr[x] != (unsigned char)0) { |
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78 break; |
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79 } |
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80 } |
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81 } |
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82 } |
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83 |
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84 return cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key); |
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85 } |
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86 |
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87 #endif |
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88 |
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89 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_start.c,v $ */ |
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90 /* $Revision: 1.11 $ */ |
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91 /* $Date: 2006/11/05 01:46:35 $ */ |