Mercurial > dropbear

annotate libtommath/bn_mp_tc_and.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 f52919ffd3b1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_TC_AND_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* two complement and */
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16 int mp_tc_and(const mp_int *a, const mp_int *b, mp_int *c)
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17 {
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18 int res = MP_OKAY, bits, abits, bbits;
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19 int as = mp_isneg(a), bs = mp_isneg(b);
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20 mp_int *mx = NULL, _mx, acpy, bcpy;
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21
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22 if ((as != MP_NO) || (bs != MP_NO)) {
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23 abits = mp_count_bits(a);
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24 bbits = mp_count_bits(b);
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25 bits = MAX(abits, bbits);
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26 res = mp_init_set_int(&_mx, 1uL);
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27 if (res != MP_OKAY) {
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28 goto end;
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29 }
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30
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31 mx = &_mx;
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32 res = mp_mul_2d(mx, bits + 1, mx);
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33 if (res != MP_OKAY) {
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34 goto end;
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35 }
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36
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37 if (as != MP_NO) {
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38 res = mp_init(&acpy);
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39 if (res != MP_OKAY) {
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40 goto end;
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41 }
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42
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43 res = mp_add(mx, a, &acpy);
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44 if (res != MP_OKAY) {
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45 mp_clear(&acpy);
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46 goto end;
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47 }
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48 a = &acpy;
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49 }
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50 if (bs != MP_NO) {
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51 res = mp_init(&bcpy);
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52 if (res != MP_OKAY) {
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53 goto end;
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54 }
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55
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56 res = mp_add(mx, b, &bcpy);
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57 if (res != MP_OKAY) {
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58 mp_clear(&bcpy);
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59 goto end;
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60 }
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61 b = &bcpy;
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62 }
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63 }
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64
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65 res = mp_and(a, b, c);
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66
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67 if ((as != MP_NO) && (bs != MP_NO) && (res == MP_OKAY)) {
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68 res = mp_sub(c, mx, c);
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69 }
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70
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71 end:
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72 if (a == &acpy) {
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73 mp_clear(&acpy);
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74 }
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75
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76 if (b == &bcpy) {
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77 mp_clear(&bcpy);
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78 }
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79
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80 if (mx == &_mx) {
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81 mp_clear(mx);
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82 }
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83
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84 return res;
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85 }
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86 #endif
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87
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88 /* ref: HEAD -> master, tag: v1.1.0 */
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89 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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90 /* commit time: 2019-01-28 20:32:32 +0100 */