Mercurial > dropbear
annotate libtomcrypt/src/modes/ctr/ctr_encrypt.c @ 1125:7cb1f49d89a8
a bit more changelog
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 12 Jun 2015 22:55:10 +0800 |
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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_encrypt.c |
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15 CTR implementation, encrypt data, 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 CTR encrypt |
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23 @param pt Plaintext |
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24 @param ct [out] Ciphertext |
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25 @param len Length of plaintext (octets) |
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26 @param ctr CTR state |
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27 @return CRYPT_OK if successful |
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28 */ |
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29 int ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CTR *ctr) |
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30 { |
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31 int x, err; |
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32 |
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33 LTC_ARGCHK(pt != NULL); |
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34 LTC_ARGCHK(ct != NULL); |
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35 LTC_ARGCHK(ctr != NULL); |
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36 |
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37 if ((err = cipher_is_valid(ctr->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 /* is blocklen/padlen valid? */ |
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42 if (ctr->blocklen < 1 || ctr->blocklen > (int)sizeof(ctr->ctr) || |
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43 ctr->padlen < 0 || ctr->padlen > (int)sizeof(ctr->pad)) { |
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44 return CRYPT_INVALID_ARG; |
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45 } |
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46 |
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47 #ifdef LTC_FAST |
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48 if (ctr->blocklen % sizeof(LTC_FAST_TYPE)) { |
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49 return CRYPT_INVALID_ARG; |
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50 } |
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51 #endif |
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52 |
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53 /* handle acceleration only if pad is empty, accelerator is present and length is >= a block size */ |
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54 if ((ctr->padlen == ctr->blocklen) && cipher_descriptor[ctr->cipher].accel_ctr_encrypt != NULL && (len >= (unsigned long)ctr->blocklen)) { |
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55 if ((err = cipher_descriptor[ctr->cipher].accel_ctr_encrypt(pt, ct, len/ctr->blocklen, ctr->ctr, ctr->mode, &ctr->key)) != CRYPT_OK) { |
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56 return err; |
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57 } |
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58 len %= ctr->blocklen; |
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59 } |
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60 |
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61 while (len) { |
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62 /* is the pad empty? */ |
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63 if (ctr->padlen == ctr->blocklen) { |
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64 /* increment counter */ |
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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 /* encrypt it */ |
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84 if ((err = cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key)) != CRYPT_OK) { |
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85 return err; |
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86 } |
285
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87 ctr->padlen = 0; |
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88 } |
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89 #ifdef LTC_FAST |
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90 if (ctr->padlen == 0 && len >= (unsigned long)ctr->blocklen) { |
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91 for (x = 0; x < ctr->blocklen; x += sizeof(LTC_FAST_TYPE)) { |
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92 *((LTC_FAST_TYPE*)((unsigned char *)ct + x)) = *((LTC_FAST_TYPE*)((unsigned char *)pt + x)) ^ |
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93 *((LTC_FAST_TYPE*)((unsigned char *)ctr->pad + x)); |
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94 } |
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95 pt += ctr->blocklen; |
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96 ct += ctr->blocklen; |
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97 len -= ctr->blocklen; |
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98 ctr->padlen = ctr->blocklen; |
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99 continue; |
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100 } |
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101 #endif |
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102 *ct++ = *pt++ ^ ctr->pad[ctr->padlen++]; |
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103 --len; |
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104 } |
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105 return CRYPT_OK; |
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106 } |
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107 |
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108 #endif |
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109 |
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110 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_encrypt.c,v $ */ |
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111 /* $Revision: 1.20 $ */ |
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112 /* $Date: 2006/11/21 00:18:23 $ */ |