Mercurial > dropbear
annotate libtomcrypt/src/encauth/gcm/gcm_init.c @ 1332:6aaec171e88e
add CVEs and patch urls
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 15 Sep 2016 21:43:57 +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 * |
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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_init.c |
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14 GCM implementation, initialize state, 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 Initialize a GCM state |
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22 @param gcm The GCM state to initialize |
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23 @param cipher The index of the cipher to use |
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24 @param key The secret key |
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25 @param keylen The length of the secret key |
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26 @return CRYPT_OK on success |
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27 */ |
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28 int gcm_init(gcm_state *gcm, int cipher, |
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29 const unsigned char *key, int keylen) |
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30 { |
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31 int err; |
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32 unsigned char B[16]; |
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33 #ifdef GCM_TABLES |
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34 int x, y, z, t; |
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35 #endif |
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36 |
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37 LTC_ARGCHK(gcm != NULL); |
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38 LTC_ARGCHK(key != NULL); |
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39 |
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40 #ifdef LTC_FAST |
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41 if (16 % sizeof(LTC_FAST_TYPE)) { |
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42 return CRYPT_INVALID_ARG; |
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43 } |
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44 #endif |
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45 |
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46 /* is cipher valid? */ |
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47 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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48 return err; |
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49 } |
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50 if (cipher_descriptor[cipher].block_length != 16) { |
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51 return CRYPT_INVALID_CIPHER; |
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52 } |
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53 |
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54 /* schedule key */ |
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55 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &gcm->K)) != CRYPT_OK) { |
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56 return err; |
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57 } |
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58 |
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59 /* H = E(0) */ |
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60 zeromem(B, 16); |
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61 if ((err = cipher_descriptor[cipher].ecb_encrypt(B, gcm->H, &gcm->K)) != CRYPT_OK) { |
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62 return err; |
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63 } |
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64 |
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65 /* setup state */ |
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66 zeromem(gcm->buf, sizeof(gcm->buf)); |
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67 zeromem(gcm->X, sizeof(gcm->X)); |
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68 gcm->cipher = cipher; |
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69 gcm->mode = GCM_MODE_IV; |
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70 gcm->ivmode = 0; |
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71 gcm->buflen = 0; |
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72 gcm->totlen = 0; |
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73 gcm->pttotlen = 0; |
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74 |
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75 #ifdef GCM_TABLES |
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76 /* setup tables */ |
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77 |
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78 /* generate the first table as it has no shifting (from which we make the other tables) */ |
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79 zeromem(B, 16); |
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80 for (y = 0; y < 256; y++) { |
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81 B[0] = y; |
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82 gcm_gf_mult(gcm->H, B, &gcm->PC[0][y][0]); |
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83 } |
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84 |
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85 /* now generate the rest of the tables based the previous table */ |
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86 for (x = 1; x < 16; x++) { |
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87 for (y = 0; y < 256; y++) { |
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88 /* now shift it right by 8 bits */ |
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89 t = gcm->PC[x-1][y][15]; |
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90 for (z = 15; z > 0; z--) { |
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91 gcm->PC[x][y][z] = gcm->PC[x-1][y][z-1]; |
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92 } |
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93 gcm->PC[x][y][0] = gcm_shift_table[t<<1]; |
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94 gcm->PC[x][y][1] ^= gcm_shift_table[(t<<1)+1]; |
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95 } |
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96 } |
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97 |
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98 #endif |
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99 |
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100 return CRYPT_OK; |
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101 } |
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102 |
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103 #endif |
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104 |
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105 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/gcm/gcm_init.c,v $ */ |
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106 /* $Revision: 1.18 $ */ |
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107 /* $Date: 2006/03/31 14:15:35 $ */ |