Mercurial > dropbear

annotate libtommath/bn_s_mp_add.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #include "tommath_private.h"
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2 #ifdef BN_S_MP_ADD_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 /* low level addition, based on HAC pp.594, Algorithm 14.7 */
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16 int s_mp_add(const mp_int *a, const mp_int *b, mp_int *c)
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17 {
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18 const mp_int *x;
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19 int olduse, res, min, max;
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20
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21 /* find sizes, we let |a| <= |b| which means we have to sort
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22 * them. "x" will point to the input with the most digits
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23 */
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24 if (a->used > b->used) {
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25 min = b->used;
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26 max = a->used;
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27 x = a;
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28 } else {
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29 min = a->used;
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30 max = b->used;
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31 x = b;
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32 }
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33
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34 /* init result */
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35 if (c->alloc < (max + 1)) {
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36 if ((res = mp_grow(c, max + 1)) != MP_OKAY) {
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37 return res;
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38 }
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39 }
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41 /* get old used digit count and set new one */
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42 olduse = c->used;
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43 c->used = max + 1;
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45 {
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46 mp_digit u, *tmpa, *tmpb, *tmpc;
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47 int i;
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49 /* alias for digit pointers */
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51 /* first input */
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52 tmpa = a->dp;
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53
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54 /* second input */
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55 tmpb = b->dp;
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56
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57 /* destination */
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58 tmpc = c->dp;
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59
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60 /* zero the carry */
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61 u = 0;
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62 for (i = 0; i < min; i++) {
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63 /* Compute the sum at one digit, T[i] = A[i] + B[i] + U */
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64 *tmpc = *tmpa++ + *tmpb++ + u;
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65
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66 /* U = carry bit of T[i] */
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67 u = *tmpc >> (mp_digit)DIGIT_BIT;
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69 /* take away carry bit from T[i] */
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70 *tmpc++ &= MP_MASK;
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71 }
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73 /* now copy higher words if any, that is in A+B
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74 * if A or B has more digits add those in
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75 */
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76 if (min != max) {
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77 for (; i < max; i++) {
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78 /* T[i] = X[i] + U */
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79 *tmpc = x->dp[i] + u;
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80
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81 /* U = carry bit of T[i] */
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82 u = *tmpc >> (mp_digit)DIGIT_BIT;
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83
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84 /* take away carry bit from T[i] */
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85 *tmpc++ &= MP_MASK;
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86 }
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87 }
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88
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89 /* add carry */
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90 *tmpc++ = u;
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91
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92 /* clear digits above oldused */
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93 for (i = c->used; i < olduse; i++) {
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94 *tmpc++ = 0;
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95 }
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parents: 1470
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96 }
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97
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98 mp_clamp(c);
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99 return MP_OKAY;
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100 }
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101 #endif
389
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102
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103 /* ref: HEAD -> master, tag: v1.1.0 */
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104 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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105 /* commit time: 2019-01-28 20:32:32 +0100 */