Mercurial > dropbear

annotate libtomcrypt/src/mac/pmac/pmac_done.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 #include "tomcrypt.h"
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10
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11 /**
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12 @file pmac_done.c
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13 PMAC implementation, terminate a session, by Tom St Denis
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14 */
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16 #ifdef LTC_PMAC
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18 int pmac_done(pmac_state *state, unsigned char *out, unsigned long *outlen)
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19 {
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20 int err, x;
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22 LTC_ARGCHK(state != NULL);
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23 LTC_ARGCHK(out != NULL);
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24 if ((err = cipher_is_valid(state->cipher_idx)) != CRYPT_OK) {
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25 return err;
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26 }
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28 if ((state->buflen > (int)sizeof(state->block)) || (state->buflen < 0) ||
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29 (state->block_len > (int)sizeof(state->block)) || (state->buflen > state->block_len)) {
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30 return CRYPT_INVALID_ARG;
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31 }
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34 /* handle padding. If multiple xor in L/x */
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36 if (state->buflen == state->block_len) {
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37 /* xor Lr against the checksum */
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38 for (x = 0; x < state->block_len; x++) {
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39 state->checksum[x] ^= state->block[x] ^ state->Lr[x];
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40 }
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41 } else {
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42 /* otherwise xor message bytes then the 0x80 byte */
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43 for (x = 0; x < state->buflen; x++) {
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44 state->checksum[x] ^= state->block[x];
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45 }
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46 state->checksum[x] ^= 0x80;
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47 }
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49 /* encrypt it */
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50 if ((err = cipher_descriptor[state->cipher_idx].ecb_encrypt(state->checksum, state->checksum, &state->key)) != CRYPT_OK) {
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51 return err;
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52 }
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53 cipher_descriptor[state->cipher_idx].done(&state->key);
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54
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55 /* store it */
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56 for (x = 0; x < state->block_len && x < (int)*outlen; x++) {
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57 out[x] = state->checksum[x];
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58 }
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59 *outlen = x;
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61 #ifdef LTC_CLEAN_STACK
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62 zeromem(state, sizeof(*state));
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63 #endif
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64 return CRYPT_OK;
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65 }
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67 #endif
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69
1471
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70 /* ref: $Format:%D$ */
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71 /* git commit: $Format:%H$ */
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72 /* commit time: $Format:%ai$ */