Mercurial > dropbear
annotate libtomcrypt/src/modes/ctr/ctr_start.c @ 384:a05fb340a95d
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to branch 'au.asn.ucc.matt.dropbear' (head 52ccb0ad0587a62bc64aecb939adbb76546aac16)
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 11 Jan 2007 03:05:30 +0000 |
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children | f849a5ca2efc |
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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 $ */ |