Mercurial > dropbear
annotate libtomcrypt/src/encauth/gcm/gcm_memory.c @ 758:1c607a62d235 ecc
Set LTC_SOURCE for proper ltm_desc etc
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 29 Mar 2013 00:26:46 +0800 (2013-03-28) |
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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, tomstdenis@gmail.com, http://libtomcrypt.com |
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10 */ |
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11 |
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12 /** |
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13 @file gcm_memory.c |
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14 GCM implementation, process a packet, by Tom St Denis |
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15 */ |
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16 #include "tomcrypt.h" |
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17 |
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18 #ifdef GCM_MODE |
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19 |
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20 /** |
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21 Process an entire GCM packet in one call. |
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22 @param cipher Index of cipher to use |
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23 @param key The secret key |
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24 @param keylen The length of the secret key |
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25 @param IV The initial vector |
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26 @param IVlen The length of the initial vector |
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27 @param adata The additional authentication data (header) |
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28 @param adatalen The length of the adata |
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29 @param pt The plaintext |
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30 @param ptlen The length of the plaintext (ciphertext length is the same) |
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31 @param ct The ciphertext |
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32 @param tag [out] The MAC tag |
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33 @param taglen [in/out] The MAC tag length |
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34 @param direction Encrypt or Decrypt mode (GCM_ENCRYPT or GCM_DECRYPT) |
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35 @return CRYPT_OK on success |
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36 */ |
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37 int gcm_memory( int cipher, |
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38 const unsigned char *key, unsigned long keylen, |
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39 const unsigned char *IV, unsigned long IVlen, |
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40 const unsigned char *adata, unsigned long adatalen, |
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41 unsigned char *pt, unsigned long ptlen, |
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42 unsigned char *ct, |
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43 unsigned char *tag, unsigned long *taglen, |
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44 int direction) |
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45 { |
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46 void *orig; |
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47 gcm_state *gcm; |
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48 int err; |
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49 |
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50 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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51 return err; |
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52 } |
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53 |
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54 if (cipher_descriptor[cipher].accel_gcm_memory != NULL) { |
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55 return |
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56 cipher_descriptor[cipher].accel_gcm_memory |
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57 (key, keylen, |
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58 IV, IVlen, |
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59 adata, adatalen, |
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60 pt, ptlen, |
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61 ct, |
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62 tag, taglen, |
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63 direction); |
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64 } |
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65 |
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66 |
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67 |
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68 #ifndef GCM_TABLES_SSE2 |
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69 orig = gcm = XMALLOC(sizeof(*gcm)); |
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70 #else |
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71 orig = gcm = XMALLOC(sizeof(*gcm) + 16); |
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72 #endif |
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73 if (gcm == NULL) { |
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74 return CRYPT_MEM; |
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75 } |
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76 |
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77 /* Force GCM to be on a multiple of 16 so we can use 128-bit aligned operations |
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78 * note that we only modify gcm and keep orig intact. This code is not portable |
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79 * but again it's only for SSE2 anyways, so who cares? |
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80 */ |
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81 #ifdef GCM_TABLES_SSE2 |
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82 if ((unsigned long)gcm & 15) { |
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83 gcm = (gcm_state *)((unsigned long)gcm + (16 - ((unsigned long)gcm & 15))); |
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84 } |
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85 #endif |
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86 |
285
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87 if ((err = gcm_init(gcm, cipher, key, keylen)) != CRYPT_OK) { |
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88 goto LTC_ERR; |
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89 } |
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90 if ((err = gcm_add_iv(gcm, IV, IVlen)) != CRYPT_OK) { |
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91 goto LTC_ERR; |
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92 } |
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93 if ((err = gcm_add_aad(gcm, adata, adatalen)) != CRYPT_OK) { |
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94 goto LTC_ERR; |
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95 } |
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96 if ((err = gcm_process(gcm, pt, ptlen, ct, direction)) != CRYPT_OK) { |
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97 goto LTC_ERR; |
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98 } |
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99 err = gcm_done(gcm, tag, taglen); |
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100 LTC_ERR: |
382
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101 XFREE(orig); |
285
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102 return err; |
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103 } |
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104 #endif |
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105 |
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106 |
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107 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/gcm/gcm_memory.c,v $ */ |
382
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108 /* $Revision: 1.23 $ */ |
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109 /* $Date: 2006/09/07 10:00:57 $ */ |