Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_init.c @ 1663:c795520269f9

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Fallback for key gen without hard link support (#89) Add a non-atomic fallback for key generation on platforms where link() is not permitted (such as most stock Android installs) or on filesystems without hard link support (such as FAT).
author Matt Robinson <git@nerdoftheherd.com>
date Sat, 14 Mar 2020 14:37:35 +0000
parents 6dba84798cd5
children
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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
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10 /**
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11 @file gcm_init.c
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12 GCM implementation, initialize state, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
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16 #ifdef LTC_GCM_MODE
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17
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18 /**
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19 Initialize a GCM state
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20 @param gcm The GCM state to initialize
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21 @param cipher The index of the cipher to use
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22 @param key The secret key
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23 @param keylen The length of the secret key
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24 @return CRYPT_OK on success
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25 */
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26 int gcm_init(gcm_state *gcm, int cipher,
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27 const unsigned char *key, int keylen)
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28 {
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29 int err;
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30 unsigned char B[16];
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31 #ifdef LTC_GCM_TABLES
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32 int x, y, z, t;
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33 #endif
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34
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35 LTC_ARGCHK(gcm != NULL);
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36 LTC_ARGCHK(key != NULL);
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37
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38 #ifdef LTC_FAST
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39 if (16 % sizeof(LTC_FAST_TYPE)) {
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40 return CRYPT_INVALID_ARG;
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41 }
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42 #endif
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43
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44 /* is cipher valid? */
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45 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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46 return err;
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47 }
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48 if (cipher_descriptor[cipher].block_length != 16) {
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49 return CRYPT_INVALID_CIPHER;
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50 }
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51
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52 /* schedule key */
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53 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &gcm->K)) != CRYPT_OK) {
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54 return err;
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55 }
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56
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57 /* H = E(0) */
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58 zeromem(B, 16);
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59 if ((err = cipher_descriptor[cipher].ecb_encrypt(B, gcm->H, &gcm->K)) != CRYPT_OK) {
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60 return err;
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61 }
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62
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63 /* setup state */
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64 zeromem(gcm->buf, sizeof(gcm->buf));
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65 zeromem(gcm->X, sizeof(gcm->X));
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66 gcm->cipher = cipher;
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67 gcm->mode = LTC_GCM_MODE_IV;
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68 gcm->ivmode = 0;
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69 gcm->buflen = 0;
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70 gcm->totlen = 0;
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71 gcm->pttotlen = 0;
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72
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73 #ifdef LTC_GCM_TABLES
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74 /* setup tables */
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75
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76 /* generate the first table as it has no shifting (from which we make the other tables) */
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77 zeromem(B, 16);
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78 for (y = 0; y < 256; y++) {
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79 B[0] = y;
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80 gcm_gf_mult(gcm->H, B, &gcm->PC[0][y][0]);
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81 }
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82
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83 /* now generate the rest of the tables based the previous table */
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84 for (x = 1; x < 16; x++) {
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85 for (y = 0; y < 256; y++) {
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86 /* now shift it right by 8 bits */
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87 t = gcm->PC[x-1][y][15];
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88 for (z = 15; z > 0; z--) {
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89 gcm->PC[x][y][z] = gcm->PC[x-1][y][z-1];
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90 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 gcm->PC[x][y][0] = gcm_shift_table[t<<1];
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 gcm->PC[x][y][1] ^= gcm_shift_table[(t<<1)+1];
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
93 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
94 }
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
103 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
104 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
105 /* commit time: $Format:%ai$ */