Mercurial > dropbear
annotate libtommath/bn_mp_reduce_2k.c @ 1672:3a97f14c0235
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 |
| rev | line source |
|---|---|
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_REDUCE_2K_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 /* reduces a modulo n where n is of the form 2**p - d */ |
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16 int mp_reduce_2k(mp_int *a, const mp_int *n, mp_digit d) |
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17 { |
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18 mp_int q; |
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19 int p, res; |
| 1436 | 20 |
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21 if ((res = mp_init(&q)) != MP_OKAY) { |
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22 return res; |
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23 } |
| 1436 | 24 |
| 25 p = mp_count_bits(n); | |
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26 top: |
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27 /* q = a/2**p, a = a mod 2**p */ |
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28 if ((res = mp_div_2d(a, p, &q, a)) != MP_OKAY) { |
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29 goto LBL_ERR; |
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30 } |
| 1436 | 31 |
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32 if (d != 1u) { |
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33 /* q = q * d */ |
| 1436 | 34 if ((res = mp_mul_d(&q, d, &q)) != MP_OKAY) { |
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35 goto LBL_ERR; |
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36 } |
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37 } |
| 1436 | 38 |
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39 /* a = a + q */ |
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40 if ((res = s_mp_add(a, &q, a)) != MP_OKAY) { |
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41 goto LBL_ERR; |
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42 } |
| 1436 | 43 |
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44 if (mp_cmp_mag(a, n) != MP_LT) { |
| 1436 | 45 if ((res = s_mp_sub(a, n, a)) != MP_OKAY) { |
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46 goto LBL_ERR; |
| 1436 | 47 } |
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48 goto top; |
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49 } |
| 1436 | 50 |
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51 LBL_ERR: |
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52 mp_clear(&q); |
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53 return res; |
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54 } |
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55 |
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56 #endif |
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57 |
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58 /* ref: HEAD -> master, tag: v1.1.0 */ |
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59 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ |
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60 /* commit time: 2019-01-28 20:32:32 +0100 */ |