Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_memory.c @ 1734:73646de50f13 DROPBEAR_2020.80

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version 2020.80
author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 Jun 2020 21:45:59 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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
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10 /**
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11 @file gcm_memory.c
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12 GCM implementation, process a packet, 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 Process an entire GCM packet in one call.
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20 @param cipher Index of cipher to use
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21 @param key The secret key
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22 @param keylen The length of the secret key
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23 @param IV The initialization vector
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24 @param IVlen The length of the initialization vector
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25 @param adata The additional authentication data (header)
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26 @param adatalen The length of the adata
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27 @param pt The plaintext
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28 @param ptlen The length of the plaintext (ciphertext length is the same)
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29 @param ct The ciphertext
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30 @param tag [out] The MAC tag
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31 @param taglen [in/out] The MAC tag length
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32 @param direction Encrypt or Decrypt mode (GCM_ENCRYPT or GCM_DECRYPT)
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33 @return CRYPT_OK on success
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34 */
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35 int gcm_memory( int cipher,
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36 const unsigned char *key, unsigned long keylen,
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37 const unsigned char *IV, unsigned long IVlen,
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38 const unsigned char *adata, unsigned long adatalen,
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39 unsigned char *pt, unsigned long ptlen,
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40 unsigned char *ct,
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41 unsigned char *tag, unsigned long *taglen,
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42 int direction)
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43 {
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44 void *orig;
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45 gcm_state *gcm;
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46 int err;
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47
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48 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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49 return err;
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50 }
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51
285
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52 if (cipher_descriptor[cipher].accel_gcm_memory != NULL) {
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53 return cipher_descriptor[cipher].accel_gcm_memory
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54 (key, keylen,
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55 IV, IVlen,
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56 adata, adatalen,
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57 pt, ptlen,
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58 ct,
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59 tag, taglen,
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60 direction);
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61 }
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62
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63
382
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64
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65 #ifndef LTC_GCM_TABLES_SSE2
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66 orig = gcm = XMALLOC(sizeof(*gcm));
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67 #else
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68 orig = gcm = XMALLOC(sizeof(*gcm) + 16);
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69 #endif
285
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70 if (gcm == NULL) {
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71 return CRYPT_MEM;
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72 }
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73
382
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74 /* Force GCM to be on a multiple of 16 so we can use 128-bit aligned operations
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75 * note that we only modify gcm and keep orig intact. This code is not portable
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76 * but again it's only for SSE2 anyways, so who cares?
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77 */
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78 #ifdef LTC_GCM_TABLES_SSE2
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79 if ((unsigned long)gcm & 15) {
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80 gcm = (gcm_state *)((unsigned long)gcm + (16 - ((unsigned long)gcm & 15)));
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81 }
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82 #endif
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83
285
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84 if ((err = gcm_init(gcm, cipher, key, keylen)) != CRYPT_OK) {
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85 goto LTC_ERR;
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86 }
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87 if ((err = gcm_add_iv(gcm, IV, IVlen)) != CRYPT_OK) {
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88 goto LTC_ERR;
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89 }
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90 if ((err = gcm_add_aad(gcm, adata, adatalen)) != CRYPT_OK) {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 goto LTC_ERR;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 if ((err = gcm_process(gcm, pt, ptlen, ct, direction)) != CRYPT_OK) {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 goto LTC_ERR;
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 err = gcm_done(gcm, tag, taglen);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 LTC_ERR:
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
98 XFREE(orig);
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 return err;
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
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
104 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
105 /* 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
106 /* commit time: $Format:%ai$ */