Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_mult_h.c @ 1659:d32bcb5c557d

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Add Ed25519 support (#91) * Add support for Ed25519 as a public key type Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. OpenSSH key import and fuzzer are not supported yet. Initially inspired by Peter Szabo. * Add curve25519 and ed25519 fuzzers * Add import and export of Ed25519 keys
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Wed, 11 Mar 2020 21:09:45 +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: $Format:%ai$ */