Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_add_iv.c @ 1672:3a97f14c0235

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Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93) * Add Chacha20-Poly1305 authenticated encryption * Add general AEAD approach. * Add [email protected] algo using LibTomCrypt chacha and poly1305 routines. Chacha20-Poly1305 is generally faster than AES256 on CPU w/o dedicated AES instructions, having the same key size. Compiling in will add ~5,5kB to binary size on x86-64. function old new delta chacha_crypt - 1397 +1397 _poly1305_block - 608 +608 poly1305_done - 595 +595 dropbear_chachapoly_crypt - 457 +457 .rodata 26976 27392 +416 poly1305_process - 290 +290 poly1305_init - 221 +221 chacha_setup - 218 +218 encrypt_packet 1068 1270 +202 dropbear_chachapoly_getlength - 147 +147 decrypt_packet 756 897 +141 chacha_ivctr64 - 137 +137 read_packet 543 637 +94 dropbear_chachapoly_start - 94 +94 read_kex_algos 792 880 +88 chacha_keystream - 69 +69 dropbear_mode_chachapoly - 48 +48 sshciphers 280 320 +40 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_chachapoly_mac - 24 +24 dropbear_chachapoly - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 5388/0) Total: 5388 bytes * Add AES128-GCM and AES256-GCM authenticated encryption * Add general AES-GCM mode. * Add [email protected] and [email protected] algo using LibTomCrypt gcm routines. AES-GCM is combination of AES CTR mode and GHASH, slower than AES-CTR on CPU w/o dedicated AES/GHASH instructions therefore disabled by default. Compiling in will add ~6kB to binary size on x86-64. function old new delta gcm_process - 1060 +1060 .rodata 26976 27808 +832 gcm_gf_mult - 820 +820 gcm_add_aad - 660 +660 gcm_shift_table - 512 +512 gcm_done - 471 +471 gcm_add_iv - 384 +384 gcm_init - 347 +347 dropbear_gcm_crypt - 309 +309 encrypt_packet 1068 1270 +202 decrypt_packet 756 897 +141 gcm_reset - 118 +118 read_packet 543 637 +94 read_kex_algos 792 880 +88 sshciphers 280 360 +80 gcm_mult_h - 80 +80 dropbear_gcm_start - 62 +62 dropbear_mode_gcm - 48 +48 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_ghash - 24 +24 dropbear_gcm_getlength - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 6434/0) Total: 6434 bytes
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 25 May 2020 20:50:25 +0500
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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10 /**
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11 @file gcm_add_iv.c
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12 GCM implementation, add IV data to the 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 Add IV data to the GCM state
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20 @param gcm The GCM state
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21 @param IV The initial value data to add
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22 @param IVlen The length of the IV
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23 @return CRYPT_OK on success
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24 */
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25 int gcm_add_iv(gcm_state *gcm,
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26 const unsigned char *IV, unsigned long IVlen)
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27 {
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28 unsigned long x, y;
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29 int err;
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30
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31 LTC_ARGCHK(gcm != NULL);
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32 if (IVlen > 0) {
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33 LTC_ARGCHK(IV != NULL);
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34 }
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36 /* must be in IV mode */
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37 if (gcm->mode != LTC_GCM_MODE_IV) {
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38 return CRYPT_INVALID_ARG;
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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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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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50 /* trip the ivmode flag */
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51 if (IVlen + gcm->buflen > 12) {
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52 gcm->ivmode |= 1;
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53 }
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54
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55 x = 0;
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56 #ifdef LTC_FAST
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57 if (gcm->buflen == 0) {
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58 for (x = 0; x < (IVlen & ~15); x += 16) {
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59 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
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60 *(LTC_FAST_TYPE_PTR_CAST(&gcm->X[y])) ^= *(LTC_FAST_TYPE_PTR_CAST(&IV[x + y]));
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61 }
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62 gcm_mult_h(gcm, gcm->X);
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63 gcm->totlen += 128;
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64 }
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65 IV += x;
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66 }
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67 #endif
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68
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69 /* start adding IV data to the state */
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70 for (; x < IVlen; x++) {
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71 gcm->buf[gcm->buflen++] = *IV++;
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72
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73 if (gcm->buflen == 16) {
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74 /* GF mult it */
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75 for (y = 0; y < 16; y++) {
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76 gcm->X[y] ^= gcm->buf[y];
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77 }
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78 gcm_mult_h(gcm, gcm->X);
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79 gcm->buflen = 0;
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80 gcm->totlen += 128;
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81 }
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82 }
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83
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 #endif
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
88
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
90 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
91 /* 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
92 /* commit time: $Format:%ai$ */