Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_init.c @ 1918:863f31b4cf3c

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Document supported formats for dropbearconvert
author Matt Johnston <matt@ucc.asn.au>
date Wed, 30 Mar 2022 12:03:50 +0800
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: $Format:%ai$ */