Mercurial > dropbear

annotate src/encauth/gcm/gcm_memory.c @ 381:999a5eb4ed10 libtomcrypt-dropbear

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propagate from branch 'au.asn.ucc.matt.ltc.orig' (head 52840647ac7f5c707c3bd158d119a15734a7ef28) to branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:39:21 +0000
parents d5faf4814ddb
children
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rev   line source
280
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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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
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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
280
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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
280
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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
280
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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:
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101 XFREE(orig);
280
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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 $ */
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108 /* $Revision: 1.23 $ */
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109 /* $Date: 2006/09/07 10:00:57 $ */