Mercurial > dropbear

annotate libtommath/bn_mp_div_2d.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 1051e4eea25a
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_DIV_2D_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 /* shift right by a certain bit count (store quotient in c, optional remainder in d) */
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16 int mp_div_2d(const mp_int *a, int b, mp_int *c, mp_int *d)
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17 {
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18 mp_digit D, r, rr;
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19 int x, res;
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21 /* if the shift count is <= 0 then we do no work */
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22 if (b <= 0) {
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23 res = mp_copy(a, c);
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24 if (d != NULL) {
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25 mp_zero(d);
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26 }
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27 return res;
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28 }
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30 /* copy */
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31 if ((res = mp_copy(a, c)) != MP_OKAY) {
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32 return res;
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33 }
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34 /* 'a' should not be used after here - it might be the same as d */
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35
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36 /* get the remainder */
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37 if (d != NULL) {
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38 if ((res = mp_mod_2d(a, b, d)) != MP_OKAY) {
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39 return res;
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40 }
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41 }
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43 /* shift by as many digits in the bit count */
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44 if (b >= DIGIT_BIT) {
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45 mp_rshd(c, b / DIGIT_BIT);
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46 }
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48 /* shift any bit count < DIGIT_BIT */
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49 D = (mp_digit)(b % DIGIT_BIT);
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50 if (D != 0u) {
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51 mp_digit *tmpc, mask, shift;
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53 /* mask */
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54 mask = ((mp_digit)1 << D) - 1uL;
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55
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56 /* shift for lsb */
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57 shift = (mp_digit)DIGIT_BIT - D;
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58
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59 /* alias */
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60 tmpc = c->dp + (c->used - 1);
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61
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62 /* carry */
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63 r = 0;
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64 for (x = c->used - 1; x >= 0; x--) {
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65 /* get the lower bits of this word in a temp */
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66 rr = *tmpc & mask;
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67
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68 /* shift the current word and mix in the carry bits from the previous word */
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69 *tmpc = (*tmpc >> D) | (r << shift);
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70 --tmpc;
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71
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72 /* set the carry to the carry bits of the current word found above */
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73 r = rr;
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74 }
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75 }
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76 mp_clamp(c);
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77 return MP_OKAY;
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78 }
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79 #endif
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80
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81 /* ref: HEAD -> master, tag: v1.1.0 */
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82 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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83 /* commit time: 2019-01-28 20:32:32 +0100 */