Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_mult_h.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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9
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10 /**
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11 @file gcm_mult_h.c
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12 GCM implementation, do the GF mult, 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 #if defined(LTC_GCM_MODE)
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17 /**
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18 GCM multiply by H
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19 @param gcm The GCM state which holds the H value
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20 @param I The value to multiply H by
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21 */
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22 void gcm_mult_h(gcm_state *gcm, unsigned char *I)
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23 {
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24 unsigned char T[16];
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25 #ifdef LTC_GCM_TABLES
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26 int x;
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27 #ifdef LTC_GCM_TABLES_SSE2
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28 asm("movdqa (%0),%%xmm0"::"r"(&gcm->PC[0][I[0]][0]));
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29 for (x = 1; x < 16; x++) {
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30 asm("pxor (%0),%%xmm0"::"r"(&gcm->PC[x][I[x]][0]));
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31 }
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32 asm("movdqa %%xmm0,(%0)"::"r"(&T));
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33 #else
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34 int y;
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35 XMEMCPY(T, &gcm->PC[0][I[0]][0], 16);
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36 for (x = 1; x < 16; x++) {
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37 #ifdef LTC_FAST
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38 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
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39 *(LTC_FAST_TYPE_PTR_CAST(T + y)) ^= *(LTC_FAST_TYPE_PTR_CAST(&gcm->PC[x][I[x]][y]));
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40 }
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41 #else
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42 for (y = 0; y < 16; y++) {
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43 T[y] ^= gcm->PC[x][I[x]][y];
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44 }
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45 #endif /* LTC_FAST */
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46 }
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47 #endif /* LTC_GCM_TABLES_SSE2 */
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48 #else
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49 gcm_gf_mult(gcm->H, I, T);
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50 #endif
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51 XMEMCPY(I, T, 16);
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52 }
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53 #endif
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54
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55 /* ref: $Format:%D$ */
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56 /* git commit: $Format:%H$ */
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57 /* commit time: $Format:%ai$ */