Mercurial > dropbear
annotate libtomcrypt/src/encauth/gcm/gcm_add_aad.c @ 908:3ca7113936c1 asm
aes and sha1 for arm
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 06 Oct 2013 21:49:15 +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 * |
382
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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_add_aad.c |
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14 GCM implementation, Add AAD data to the stream, 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 Add AAD to the GCM state |
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22 @param gcm The GCM state |
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23 @param adata The additional authentication data to add to the GCM state |
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24 @param adatalen The length of the AAD data. |
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25 @return CRYPT_OK on success |
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26 */ |
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27 int gcm_add_aad(gcm_state *gcm, |
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28 const unsigned char *adata, unsigned long adatalen) |
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29 { |
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30 unsigned long x; |
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31 int err; |
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32 #ifdef LTC_FAST |
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33 unsigned long y; |
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34 #endif |
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35 |
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36 LTC_ARGCHK(gcm != NULL); |
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37 if (adatalen > 0) { |
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38 LTC_ARGCHK(adata != NULL); |
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39 } |
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40 |
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41 if (gcm->buflen > 16 || gcm->buflen < 0) { |
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42 return CRYPT_INVALID_ARG; |
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43 } |
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44 |
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45 if ((err = cipher_is_valid(gcm->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 /* in IV mode? */ |
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50 if (gcm->mode == GCM_MODE_IV) { |
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51 /* let's process the IV */ |
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52 if (gcm->ivmode || gcm->buflen != 12) { |
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53 for (x = 0; x < (unsigned long)gcm->buflen; x++) { |
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54 gcm->X[x] ^= gcm->buf[x]; |
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55 } |
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56 if (gcm->buflen) { |
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57 gcm->totlen += gcm->buflen * CONST64(8); |
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58 gcm_mult_h(gcm, gcm->X); |
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59 } |
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60 |
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61 /* mix in the length */ |
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62 zeromem(gcm->buf, 8); |
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63 STORE64H(gcm->totlen, gcm->buf+8); |
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64 for (x = 0; x < 16; x++) { |
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65 gcm->X[x] ^= gcm->buf[x]; |
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66 } |
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67 gcm_mult_h(gcm, gcm->X); |
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68 |
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69 /* copy counter out */ |
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70 XMEMCPY(gcm->Y, gcm->X, 16); |
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71 zeromem(gcm->X, 16); |
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72 } else { |
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73 XMEMCPY(gcm->Y, gcm->buf, 12); |
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74 gcm->Y[12] = 0; |
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75 gcm->Y[13] = 0; |
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76 gcm->Y[14] = 0; |
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77 gcm->Y[15] = 1; |
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78 } |
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79 XMEMCPY(gcm->Y_0, gcm->Y, 16); |
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80 zeromem(gcm->buf, 16); |
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81 gcm->buflen = 0; |
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82 gcm->totlen = 0; |
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83 gcm->mode = GCM_MODE_AAD; |
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84 } |
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85 |
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86 if (gcm->mode != GCM_MODE_AAD || gcm->buflen >= 16) { |
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87 return CRYPT_INVALID_ARG; |
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88 } |
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89 |
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90 x = 0; |
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91 #ifdef LTC_FAST |
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92 if (gcm->buflen == 0) { |
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93 for (x = 0; x < (adatalen & ~15); x += 16) { |
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94 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) { |
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95 *((LTC_FAST_TYPE*)(&gcm->X[y])) ^= *((LTC_FAST_TYPE*)(&adata[x + y])); |
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96 } |
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97 gcm_mult_h(gcm, gcm->X); |
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98 gcm->totlen += 128; |
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99 } |
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100 adata += x; |
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101 } |
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102 #endif |
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103 |
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104 |
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105 /* start adding AAD data to the state */ |
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106 for (; x < adatalen; x++) { |
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107 gcm->X[gcm->buflen++] ^= *adata++; |
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108 |
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109 if (gcm->buflen == 16) { |
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110 /* GF mult it */ |
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111 gcm_mult_h(gcm, gcm->X); |
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112 gcm->buflen = 0; |
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113 gcm->totlen += 128; |
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114 } |
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115 } |
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116 |
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117 return CRYPT_OK; |
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118 } |
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119 #endif |
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120 |
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121 |
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122 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/gcm/gcm_add_aad.c,v $ */ |
382
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123 /* $Revision: 1.16 $ */ |
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124 /* $Date: 2006/09/23 19:24:21 $ */ |