nettle-bugs

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2219 discussions

Support for ML-KEM (Kyber)
by Daiki Ueno 04 Mar '24

04 Mar '24

Hello, I created a draft patch to support ML-KEM (a post-quantum key encapsulation mechanism, formerly known as Kyber)[1], based on the explanation in the corresponding IETF draft[2]. There are probably a lot of rooms for improvements (performance, side-channel safety), but I'm sharing the code at: https://git.lysator.liu.se/nettle/nettle/-/merge_requests/62 Any comments or suggestions would be appreciated. Footnotes: [1] https://csrc.nist.gov/pubs/fips/203/ipd [2] https://datatracker.ietf.org/doc/draft-cfrg-schwabe-kyber/ Regards, -- Daiki Ueno

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reply: reply: A new realization of ecc-sm2
by zhongxuan (A) 14 Feb '24

14 Feb '24

> "zhongxuan (A)" <zhongxuan2(a)huawei.com> writes: >> Where should I commit my patch? The access request to fork in Nettle / nettle * GitLab (liu.se)<https://git.lysator.liu.se/nettle/nettle> was denied. > Hi, I think you asked for "developer access" in the Nettle repo, which would allow you to push any changes you like to the repository. You can't have that, but unfortunately, I couldn't add any explanatory message when pushing the deny button in gitlab. > The usual way to contribute code in gitlab (as well as on github), is that you make your own "fork" of the repository, where you have full permissions. You commit your changes to a branch in that fork, and then create a merge request asking for changes to be merged into the original repo. Yes, I've tried to make a fork in https://git.lysator.liu.se/nettle/nettle/-/forks/new but failed, it just reports ' An error occurred while forking the project. Please try again. '. I replied a long email but tragically didn’t attach my patch. Here I attach my new patch of ecc-sm2. Besides, could you help me figure out what's wrong with my fork? I preferred to commit in fork mode, too. > See > https://docs.gitlab.com/ee/user/project/repository/forking_workflow.html > on how to create a fork from the gitlab ui. > When you work with git locally, you can have both your own "fork" repo and the original repo as git "remotes". > And if gitlab doesn't work out for you, you could also send the updated patch to this list. > Best regards, > /Niels > -- > Niels Möller. PGP key CB4962D070D77D7FCB8BA36271D8F1FF368C6677. > Internet email is subject to wholesale government surveillance.

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Question on s390x AES acceleration
by Niels Möller 27 Jan '24

27 Jan '24

When I look at the logic in https://git.lysator.liu.se/nettle/nettle/-/blob/master/fat-s390x.c?ref_type…, automatic detection of hardware acceleration for aes128, aes192 and aes256 is done independently for each key size, based on corresponding bits in the "km status" words. While when configured manually, at configure time or using NETTLE_FAT_OVERRIDE, there are instead two flags, "msa_x1" enabling aes128 (and sha256), and "msa_x2" enabling aes192, aes256 (and sha512). I'm thinking that if we could enable all or none of the s390x aes assembly, then we could make things a bit simpler, only overriding the internal _nettle_aes_set_key and _nettle_aes_invert_key, instead of all 9 of aes{128,192,256}_{set_encrypt,set_decrypt,invert}_key. Are there s390x machines out there that have hardware support for just some of the aes key sizes but not all? Regards, /Niels -- Niels Möller. PGP key CB4962D070D77D7FCB8BA36271D8F1FF368C6677. Internet email is subject to wholesale government surveillance.

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Sparc assembly
by Niels Möller 24 Jan '24

24 Jan '24

Hi, I just pushed changes to the ci script to enable sparc64 tests. It turned out to be rather easy with current debian-based tools, despite sparc64 no longer being a release architecture. (Install gcc-sparc64-linux-gnu cross compiler, use qemu-sparc64, only workaround (similar to some other archs) was that QEMU_LD_PREFIX had to be set explicitly). I don't now if anyone is interested in sparc performance, or contributing more sparc64 code (I'd consider this architecture rather obscure by now). But these tests should at least make it rather easy to maintain the code for the time being. Even as I consider some changes to the handling aes decryption subkeys that will require updates to this code. On the other hand, I'm considering deleting the sparc32 assembly code. Related machines like the sparc stations (I don't remember if I had a SS-5, SS-10 or SS-20 at the time I wrote this code, but I remember I had redhat linux installed on it rather than solaris) are out of support since the late 1990s. 64-bit sparcs, aka sparc v9, were introduced with the ultrasparc machines from 1995. Regards, /Niels -- Niels Möller. PGP key CB4962D070D77D7FCB8BA36271D8F1FF368C6677. Internet email is subject to wholesale government surveillance.

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A new realization of ecc-sm2
by zhongxuan (A) 23 Jan '24

23 Jan '24

Hi Niels, I have sent a new version of ecc-sm2 realization patch cause that I'm not sure which git repository should I commit (gitlab or github?). I have tried the ecc_mod_inv and it works well in FP. Where should I commit my patch? The access request to fork in Nettle / nettle * GitLab (liu.se)<https://git.lysator.liu.se/nettle/nettle> was denied. Best regards

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reply: reply: a realization of SM2 and questions about my subscription request of mailinglist
by zhongxuan (A) 22 Jan '24

22 Jan '24

Sorry for so long to reply, I tried to fork a branch in gitlab(https://git.lysator.liu.se/nettle/nettle) but failed, seemed that I don’t have enough permissions, or should I push my code in github(https://github.com/gnutls/nettle) ? Here are the replies: >"zhongxuan (A)" <zhongxuan2(a)huawei.com> writes: > >> Anyway, I made a realization of SM2, Here is the first part of it, >> including the curve and sm2_add and sm2_mul in affine coordinate. > >Thanks, I'm having a first read, see comments below. It would be good to have a link to the best english-language (and freely available) reference. I think you have told me earlier, and I've found https://datatracker.ietf.org/doc/html/draft-shen-sm2-ecdsa. It would be helpful with a reference in a comment, e.g., at the top of ecc-sm2.c. Insert a opensource link of this elliptic curve at the top of ecc-sm2.c > >> And if it's convenient to you, I can push the other parts including >> keygen, crypt and sign. > >I think it's a good first step to get basic scalar multiplication working, i.e., ecc_point_mul and ecc_point_mul_g working and tested. Thus this sm2 is also a 'a + 3 mod p = 0' elliptic curve, the mul_a and mul_g function of secp256r1 can also work. We have tested the result with the geometric method like what in eccdata.c. > >For signatures, are they similar to ECDSA, or something different? For encryption, how does that work? Yes its similar to ECDSA, you can refer to this page: https://datatracker.ietf.org/doc/html/draft-shen-sm2-ecdsa Or there is an official public manual about this curve: http://www.gmbz.org.cn/main/postDetail.html?id=20180724110812 I'm not sure whether could you access these pdfs. > >My initial comments on your patch inline below. > >Regards, >/Niels > >> --- /dev/null >> +++ b/ecc-sm2.c >> @@ -0,0 +1,261 @@ >> +/* ecc-sm2.c >> + >> + Compile time constant (but machine dependent) tables. > >Anything that is machine dependent should be in ecc-sm2.h, generated by eccdata. Removed. > >> + Copyright (c) Huawei Technologies Co., Ltd. 2022-2022. All rights reserved. >> + >> + This file is part of GNU Nettle. >> + >> + GNU Nettle is free software: you can redistribute it and/or >> + modify it under the terms of either: >> + >> + * the GNU Lesser General Public License as published by the Free >> + Software Foundation; either version 3 of the License, or (at your >> + option) any later version. >> + >> + or >> + >> + * the GNU General Public License as published by the Free >> + Software Foundation; either version 2 of the License, or (at your >> + option) any later version. >> + >> + or both in parallel, as here. >> + >> + GNU Nettle is distributed in the hope that it will be useful, >> + but WITHOUT ANY WARRANTY; without even the implied warranty of >> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU >> + General Public License for more details. >> + >> + You should have received copies of the GNU General Public License and >> + the GNU Lesser General Public License along with this program. If >> + not, see http://www.gnu.org/licenses/. >> +*/ >> + >> +/* Development of Nettle's ECC support was funded by the .SE >> +Internet Fund. */ >> + >> +#if HAVE_CONFIG_H >> +# include "config.h" >> +#endif >> + >> +#include <string.h> >> +#include <assert.h> >> + >> +#include "sm2.h" >> +#include "sm2-internal.h" >> +#include "ecc-internal.h" >> +#include "ecc-sm2.h" >> +#include "ecc-curve.h" >> + >> +const char *nettle_sm2_a = >> +"fffffffeffffffffffffffffffffffffffffffff00000000fffffffffffffffc"; >> +const char *nettle_sm2_xG = >> +"32c4ae2c1f1981195f9904466a39c9948fe30bbff2660be1715a4589334c74c7"; >> +const char *nettle_sm2_yG = >> +"bc3736a2f4f6779c59bdcee36b692153d0a9877cc62a474002df32e52139f0a0"; > >These strings appear unused. Yep, this base point is unused, removed. The nettle_sm2_a used to check whether a point is in sm2 curve, by checking y^2 = x^3 + ax + b. > >> +static void >> +ecc_sm2_inv (const struct ecc_modulo *p, >> + mp_limb_t *rp, const mp_limb_t *ap, >> + mp_limb_t *scratch) { #define a5m1 scratch >> +#define >> +t0 (scratch + ECC_LIMB_SIZE) #define a15m1 t0 #define a32m1 a5m1 >> +#define a62m1 (scratch + 2*ECC_LIMB_SIZE) #define a96m1 t0 #define >> +a3 (scratch + 3*ECC_LIMB_SIZE) #define tp (scratch + >> +4*ECC_LIMB_SIZE) >> +/* >> + Addition chain for p - 2 = 2^{256} - 2^{224} + 2^{192} + 2^{96} - >> +3 >> + >> + 2^5 - 1 = 1 + 2 (2^4 - 1) = 1 + 2 (2^2+1)(2 + 1) 4 S + 3 M >> + 2^{15} - 1 = (2^5 - 1) (1 + 2^5 (1 + 2^5) 10 S + 2 M >> + 2^{16} - 1 = 1 + 2 (2^{15} - 1) S + M >> + 2^{32} - 1 = (2^{16} + 1) (2^{16} - 1) 16 S + M >> + >> + 2^{31} - 1 = (2^{16} - 1) * 2^{15} + 2^{15} - 1 >> + 2^{62} - 1 = (2^{31} - 1) * 2^{31} + 2^{31} - 1 >> + 2^{94} - 1 = (2^{62} - 1) * 2^{32} + 2^{32} - 1 >> + 2^{96} - 1 = (2^{94} - 1) * 2^{2} + 3 >> + >> + 2^{64} - 2^{32} - 1 = (2^{32} - 2) * 2^{32} + 2^{32} - 1 >> + 2^{160} - 2^{128} - 1 = (2^{64} - 2^{32} - 1) * 2^{96} + 2^{96} - 1 >> + 2^{254} - 2^{222} - 2^{94} + 2^{62} - 1 = (2^{160} - 2^{128} - 1) * 2^{94} + 2^{62} - 1 >> + 2^{256} - 2^{224} - 2^{96} + 2^{64} - 3 = (2^{254} - 2^{222} - >> + 2^{94} + 2^{62} - 1) * 2^{2} + 1 >> + >> + */ >> + ecc_mod_sqr (p, rp, ap, tp); /* a^2 */ >> + ecc_mod_mul (p, a3, rp, ap, tp); /* a^3 */ >> + ecc_mod_pow_2kp1 (p, t0, a3, 2, tp); /* a^{2^4 - 1} */ >> + ecc_mod_sqr (p, rp, t0, tp); /* a^{2^5 - 2} */ >> + ecc_mod_mul (p, a5m1, rp, ap, tp); /* a^{2^5 - 1}, a5m1 */ >> + >> + ecc_mod_pow_2kp1 (p, rp, a5m1, 5, tp); /* a^{2^{10} - 1, a5m1*/ >> + ecc_mod_pow_2k_mul (p, a15m1, rp, 5, a5m1, tp); /* a^{2^{15} - 1}, a5m1 a15m1 */ >> + ecc_mod_sqr (p, rp, a15m1, tp); /* a^{2^{16} - 2}, a15m1 */ >> + ecc_mod_mul (p, rp, rp, ap, tp); /* a^{2^{16} - 1}, a15m1 */ >> + ecc_mod_pow_2kp1 (p, a32m1, rp, 16, tp); /* a^{2^{32} - 1}, a15m1, a32m1 */ >> + ecc_mod_pow_2k_mul (p, rp, rp, 15, a15m1, tp); /* a^{2^{31} - 1}, >> + a15m1 */ >> + >> + ecc_mod_pow_2kp1 (p, a62m1, rp, 31, tp); /* a^{2^{62} - 1}, a62m1 >> + */ ecc_mod_pow_2k_mul (p, a96m1, a62m1, 32, a32m1, tp); /* >> + a^{2^{94} - 1}, a62m1, a32m1 */ ecc_mod_pow_2k_mul (p, a96m1, >> + a96m1, 2, a3, tp); /* a^{2^{96} - 1}, a96m1, a3 */ >> + >> + ecc_mod_sqr (p, rp, rp, tp); /* a^{2^{32} - 2} */ >> + ecc_mod_pow_2k_mul (p, rp, rp, 32, a32m1, tp); /* a^{2^{64} - >> +2^{32} - 1 */ >> + ecc_mod_pow_2k_mul (p, rp, rp, 96, a96m1, tp); /* a^{2^{160} - >> +2^{128} - 1 */ >> + ecc_mod_pow_2k_mul (p, rp, rp, 94, a62m1, tp); /* a^{2^{254} - >> +2^{222} - 2^{94} + 2^{62} - 1}, a62m1 */ >> + ecc_mod_pow_2k_mul (p, rp, rp, 2, ap, tp); /* a^{2^{256} - 2^{224} >> +- 2^{96} + 2^{64} - 3} */ } >> + >> +void >> +sm2_get_order (mpz_t order) >> +{ >> + if (!order->_mp_d) >> + return; >> + const struct ecc_curve *ecc = nettle_get_sm2(); >> + mpz_set_n(order, ecc->q.m, ecc->q.size); } > >Why is the sm2_get_order needed? It appears unused in the current patch. Yes, this is a test interface, removed. > >> +static mp_limb_t SM2_P[8] = { >> + 0xffffffff, 0xffffffff, 0x00000000, 0xffffffff, >> + 0xffffffff, 0xffffffff, 0xffffffff, 0xfffffffe, }; > >Is this for 32-bit limb size? On which platform have you tested the code? Should probably use _nettle_sm2.p.m instead. No, its still a 64-bit limb size, we use it in fast reduction, we will try to use a nettle interface instead. > >I'm a bit confused, because this looks like 32-bit limbs, but elsewhere you shift by 32 bits which isn't valid for this limb size. > >> +static int sm2_bn_cmp(const mp_limb_t *a, const mp_limb_t *b) { >> + int i; >> + for (i = 7; i >= 0; i--) { >> + if (a[i] > b[i]) >> + return 1; >> + if (a[i] < b[i]) >> + return -1; >> + } >> + return 0; >> +} > >This will not be side-channel silent. Seems that we can use mpn_cmp instead, though I don’t get the difference between mpn_cmp and this sm2_bn_cmp, is mpn_cmp also not side-channel silent? > >> +static void sm2_bn_sub(mp_limb_t *ret, const mp_limb_t *a, const >> +mp_limb_t *b) { >> + int i; >> + mp_limb_t r[8]; >> + r[0] = ((uint64_t)1 << 32) + a[0] - b[0]; >> + for (i = 1; i < 7; i++) { >> + r[i] = 0xffffffff + a[i] - b[i] + (r[i - 1] >> 32); >> + r[i - 1] &= 0xffffffff; >> + } >> + r[i] = a[i] - b[i] + (r[i - 1] >> 32) - 1; >> + r[i - 1] &= 0xffffffff; >> + memcpy(ret, r, 64); >> +} > >Is there some reason the general ecc_mod_sub can't work work? Seems that it can't work. We use a fast reduction matrix, splitting a 64 bits limb into two 32 bits limbs. I also tried mpn_sub_n but seems it doesn’t work too. I am trying to optimize the calculation or use ecc_mod here instead. > >> +static void >> +ecc_sm2_modp (const struct ecc_modulo *p, mp_limb_t *rp, mp_limb_t >> +*xp) { >> + uint64_t s[16] = {0}; >> + uint64_t d[8] = {0}; >> + uint64_t r[8] = {0}; >> + >> + for (int i = 0; i < 8; i++) { >> + s[2*i] = xp[i] & 0xffffffff; >> + s[2*i+1] = xp[i] >> 32; >> + } >> + >> + r[0] = s[0] + s[8] + s[9] + s[10] + s[11] + s[12] + ((s[13] + >> + s[14] >> + + s[15]) << 1); r[1] = s[1] + s[9] + s[10] + s[11] + s[12] + s[13] >> + + ((s[14] + s[15]) << 1); r[2] = s[2]; r[3] = s[3] + s[8] + s[11] >> + + s[12] + s[14] + s[15] + (s[13] << 1); r[4] = s[4] + s[9] + s[12] >> + + s[13] + s[15] + (s[14] << 1); r[5] = s[5] + s[10] + s[13] + >> + + s[14] (s[15] << 1); r[6] = s[6] + s[11] + s[14] + s[15]; r[7] = >> + + s[7] + >> + s[8] + s[9] + s[10] + s[11] + s[15] + ((s[12] + s[13] + s[14] + >> + s[15]) << 1); >> + >> + for (int i = 1; i < 8; i++) { >> + r[i] += r[i - 1] >> 32; >> + r[i - 1] &= 0xffffffff; >> + } >> + >> + d[2] = s[8] + s[9] + s[13] + s[14]; d[3] = d[2] >> 32; d[2] &= >> + 0xffffffff; sm2_bn_sub(r, r, d); >> + >> + while (sm2_bn_cmp(r, SM2_P) >= 0) { >> + sm2_bn_sub(r, r, SM2_P); >> + } >> + >> + rp[0] = (r[0] & 0xffffffff) + ((r[1] & 0xffffffff) << 32); rp[1] >> + = (r[2] & 0xffffffff) + ((r[3] & 0xffffffff) << 32); rp[2] = (r[4] >> + & 0xffffffff) + ((r[5] & 0xffffffff) << 32); rp[3] = (r[6] & >> + 0xffffffff) + ((r[7] & 0xffffffff) << 32); } > >I would suggest starting with the general ecc_mod function (I think it should work for the modulo used with sm2). When that is in place, one can add optimized variants for 32-bit and/or 64-bit limbs to speed that up. Here is a problem, ecc_mod stop in ' assert (bn < mn); ' in ecc-mod.c line 56, is sm2 different from other weierstrass curves or I made some mistakes? To avoid this I still use ecc_sm2_modp but change the cmp functions with mpn functions. > >> +const struct ecc_curve _nettle_sm2 = { >> + { >> + 256, >> + ECC_LIMB_SIZE, >> + ECC_BMODP_SIZE, >> + ECC_REDC_SIZE, >> + 4 * ECC_LIMB_SIZE, >> + 4 * ECC_LIMB_SIZE, >> + 0, >> + >> + ecc_p, >> + ecc_Bmodp, >> + ecc_Bmodp_shifted, >> + ecc_redc_ppm1, >> + ecc_pp1h, >> + >> + NULL, >> + ecc_sm2_modp, >> + ecc_sm2_inv, >> + NULL, >> + NULL, >> + }, >> + { >> + 256, >> + ECC_LIMB_SIZE, >> + ECC_BMODQ_SIZE, >> + 0, >> + ECC_MOD_INV_ITCH (ECC_LIMB_SIZE), >> + 0, >> + 0, >> + >> + ecc_q, >> + ecc_Bmodq, >> + ecc_Bmodq_shifted, >> + NULL, >> + ecc_qp1h, >> + >> + NULL, >> + NULL, >> + ecc_mod_inv, >> + NULL, >> + NULL, >> + }, >> + >> + ECC_REDC_SIZE == 0, >> + ECC_PIPPENGER_K, >> + ECC_PIPPENGER_C, >> + >> + ECC_ADD_JJA_ITCH (ECC_LIMB_SIZE), >> + ECC_ADD_JJJ_ITCH (ECC_LIMB_SIZE), >> + ECC_DUP_JJ_ITCH (ECC_LIMB_SIZE), >> + ECC_MUL_A_ITCH (ECC_LIMB_SIZE), >> + ECC_MUL_G_ITCH (ECC_LIMB_SIZE), >> + ECC_J_TO_A_ITCH(ECC_LIMB_SIZE, 4 * ECC_LIMB_SIZE), >> + >> + ecc_add_jja, >> + ecc_add_jjj, >> + ecc_dup_jj, > >I had expected pointers to new add and dup functions here, since existing functions assume a = -3. Thus this sm2's p = 2^256 - x^224 - 2^96 + 2^64 - 1, which is also a 'a + 3 mod p = 0' elliptic curve, the add_jja, add_jjj, dup_jj can also work. We proved it by comparing with geometric method. > >> + ecc_mul_a, >> + ecc_mul_g, >> + ecc_j_to_a, >> + >> + ecc_b, >> + ecc_unit, >> + ecc_table >> +}; >> + >> +const struct ecc_curve *nettle_get_sm2(void) { >> + return &_nettle_sm2; >> +} >> diff --git a/eccdata.c b/eccdata.c >> index 4d8827f..71a524d 100644 >> --- a/eccdata.c >> +++ b/eccdata.c >> @@ -44,6 +44,9 @@ >> >> /* Affine coordinates, for simplicity. Infinity point, i.e., te >> neutral group element, is represented using the is_zero flag. */ >> + >> +const char *nettle_sm2_a = >> +"fffffffeffffffffffffffffffffffffffffffff00000000fffffffffffffffc"; > >Do I get it right that sm2 uses a weierstrass curve, but with a different a value than the a = -3 used for the other weierstrass curves? >For the eccdata program, I would suggest adding the a constant to the struct ecc_curve, and use the same formulas for all the weierstrass curves. E.g, add an argument to ecc_curve_init_str to set a, and let NULL mean the default of -3. Now we add param a in eccdata first. Besides, I let NULL in EDWARDS curve, which means also -3 although EDWARDS don’t have a param a, would it be fine? Did some changes to ecc_dup to use same formulas in all weierstrass curves. > >> struct ecc_point >> { >> int is_zero; >> @@ -59,6 +62,8 @@ enum ecc_type >> ECC_TYPE_EDWARDS, >> /* -x^2 + y^2 = 1 - d x^2 y^2 */ >> ECC_TYPE_TWISTED_EDWARDS, >> + /* y^2 = x^3 + ax + b (mod p) */ >> + ECC_TYPE_SM2, >> }; >> >> struct ecc_curve >> @@ -145,64 +150,111 @@ static void >> ecc_dup (const struct ecc_curve *ecc, >> struct ecc_point *r, const struct ecc_point *p) { >> - if (ecc->type != ECC_TYPE_WEIERSTRASS) >> - { >> - ecc_add (ecc, r, p, p); >> - return; >> - } >> + if (ecc->type != ECC_TYPE_WEIERSTRASS && ecc->type != >> + ECC_TYPE_SM2) { >> + ecc_add (ecc, r, p, p); >> + return; >> + } >> if (ecc_zero_p (p)) >> ecc_set_zero (ecc, r); >> >> + else if (ecc->type == ECC_TYPE_SM2) { >> + mpz_t m, t, x, y, a; >> + >> + mpz_init (m); >> + mpz_init (t); >> + mpz_init (x); >> + mpz_init (y); >> + mpz_init_set_str(a, nettle_sm2_a, 16); >> + >> + /* m = (2 y)^-1 */ >> + mpz_mul_ui (m, p->y, 2); >> + mpz_invert (m, m, ecc->p); >> + >> + /* t = 3x^2 + a */ >> + mpz_mul (t, p->x, p->x); >> + mpz_mod (t, t, ecc->p); >> + mpz_mul_ui (t, t, 3); >> + mpz_mod (t, t, ecc->p); >> + mpz_add(t, t, a); >> + mpz_mod (t, t, ecc->p); >> + >> + /* t = t * m */ >> + mpz_mul (t, t, m); >> + mpz_mod (t, t, ecc->p); >> + >> + /* x' = t^2 - 2 x */ >> + mpz_mul (x, t, t); >> + mpz_submul_ui (x, p->x, 2); >> + >> + mpz_mod (x, x, ecc->p); >> + >> + /* y' = (x - x') * t - y */ >> + mpz_sub (y, p->x, x); >> + mpz_mul (y, y, t); >> + mpz_sub (y, y, p->y); >> + mpz_mod (y, y, ecc->p); >> + >> + r->is_zero = 0; >> + mpz_swap (x, r->x); >> + mpz_swap (y, r->y); >> + >> + mpz_clear (m); >> + mpz_clear (t); >> + mpz_clear (x); >> + mpz_clear (y); >> + } >> else >> - { >> - mpz_t m, t, x, y; >> - >> - mpz_init (m); >> - mpz_init (t); >> - mpz_init (x); >> - mpz_init (y); >> - >> - /* m = (2 y)^-1 */ >> - mpz_mul_ui (m, p->y, 2); >> - mpz_invert (m, m, ecc->p); >> - >> - /* t = 3 (x^2 - 1) * m */ >> - mpz_mul (t, p->x, p->x); >> - mpz_mod (t, t, ecc->p); >> - mpz_sub_ui (t, t, 1); >> - mpz_mul_ui (t, t, 3); >> - >> - mpz_mul (t, t, m); >> - mpz_mod (t, t, ecc->p); >> - >> - /* x' = t^2 - 2 x */ >> - mpz_mul (x, t, t); >> - mpz_submul_ui (x, p->x, 2); >> - >> - mpz_mod (x, x, ecc->p); >> - >> - /* y' = (x - x') * t - y */ >> - mpz_sub (y, p->x, x); >> - mpz_mul (y, y, t); >> - mpz_sub (y, y, p->y); >> - mpz_mod (y, y, ecc->p); >> - >> - r->is_zero = 0; >> - mpz_swap (x, r->x); >> - mpz_swap (y, r->y); >> - >> - mpz_clear (m); >> - mpz_clear (t); >> - mpz_clear (x); >> - mpz_clear (y); >> - } >> + { >> + mpz_t m, t, x, y; >> + >> + mpz_init (m); >> + mpz_init (t); >> + mpz_init (x); >> + mpz_init (y); >> + >> + /* m = (2 y)^-1 */ >> + mpz_mul_ui (m, p->y, 2); >> + mpz_invert (m, m, ecc->p); >> + >> + /* t = 3 (x^2 - 1) * m */ >> + mpz_mul (t, p->x, p->x); >> + mpz_mod (t, t, ecc->p); >> + mpz_sub_ui (t, t, 1); >> + mpz_mul_ui (t, t, 3); >> + >> + mpz_mul (t, t, m); >> + mpz_mod (t, t, ecc->p); >> + >> + /* x' = t^2 - 2 x */ >> + mpz_mul (x, t, t); >> + mpz_submul_ui (x, p->x, 2); >> + >> + mpz_mod (x, x, ecc->p); >> + >> + /* y' = (x - x') * t - y */ >> + mpz_sub (y, p->x, x); >> + mpz_mul (y, y, t); >> + mpz_sub (y, y, p->y); >> + mpz_mod (y, y, ecc->p); >> + >> + r->is_zero = 0; >> + mpz_swap (x, r->x); >> + mpz_swap (y, r->y); >> + >> + mpz_clear (m); >> + mpz_clear (t); >> + mpz_clear (x); >> + mpz_clear (y); >> + } >> } >> >> static void >> ecc_add (const struct ecc_curve *ecc, struct ecc_point *r, >> const struct ecc_point *p, const struct ecc_point *q) { >> - if (ecc->type == ECC_TYPE_WEIERSTRASS) >> + if (ecc->type == ECC_TYPE_WEIERSTRASS || ecc->type == >> + ECC_TYPE_SM2) >> { >> if (ecc_zero_p (p)) >> ecc_set (r, q); >> @@ -760,6 +812,25 @@ ecc_curve_init (struct ecc_curve *ecc, const char *curve) >> "c0d8f97ea1ca9472b5d444285d0d4f5b" >> "32e236f86de51839"); >> } >> + else if (!strcmp (curve, "sm2")) >> + { >> + ecc_curve_init_str (ecc, ECC_TYPE_SM2, >> + /* p */ >> + "fffffffeffffffffffffffffffffffff" >> + "ffffffff00000000ffffffffffffffff", >> + /* b */ >> + "28e9fa9e9d9f5e344d5a9e4bcf6509a7" >> + "f39789f515ab8f92ddbcbd414d940e93", >> + /* q (order) */ >> + "fffffffeffffffffffffffffffffffff" >> + "7203df6b21c6052b53bbf40939d54123", >> + /* g_x */ >> + "32c4ae2c1f1981195f9904466a39c994" >> + "8fe30bbff2660be1715a4589334c74c7", >> + /* g_y */ >> + "bc3736a2f4f6779c59bdcee36b692153" >> + "d0a9877cc62a474002df32e52139f0a0"); >> + } >> else >> { >> fprintf (stderr, "No known curve with name %s\n", curve); diff >> --git a/sm2-add.c b/sm2-add.c new file mode 100644 index >> 0000000..f32676c >> --- /dev/null >> +++ b/sm2-add.c >> @@ -0,0 +1,67 @@ >> +/* sm2-mul.c >> + >> + Copyright (c) Huawei Technologies Co., Ltd. 2022-2022. All rights reserved. >> + >> + This file is part of GNU Nettle. >> + >> + GNU Nettle is free software: you can redistribute it and/or >> + modify it under the terms of either: >> + >> + * the GNU Lesser General Public License as published by the Free >> + Software Foundation; either version 3 of the License, or (at your >> + option) any later version. >> + >> + or >> + >> + * the GNU General Public License as published by the Free >> + Software Foundation; either version 2 of the License, or (at your >> + option) any later version. >> + >> + or both in parallel, as here. >> + >> + GNU Nettle is distributed in the hope that it will be useful, >> + but WITHOUT ANY WARRANTY; without even the implied warranty of >> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU >> + General Public License for more details. >> + >> + You should have received copies of the GNU General Public License and >> + the GNU Lesser General Public License along with this program. If >> + not, see http://www.gnu.org/licenses/. >> +*/ >> + >> +#if HAVE_CONFIG_H >> +# include "config.h" >> +#endif >> + >> +#include <string.h> >> + >> +#include "ecc.h" >> +#include "ecc-internal.h" >> + >> +#include "sm2.h" >> +#include "sm2-internal.h" >> + >> +int >> +sm2_add (struct ecc_point *r, const struct ecc_point *p, >> + const struct ecc_point *q) > >What's the usecase for this function? If it is needed, it might be better with a general ecc_point_add. Its just an encapsulation, we will remove it. > >> +{ >> + const struct ecc_curve *ecc = p->ecc; >> + if (!sm2_check_point(p) || !sm2_check_point(q)) { >> + return 0; >> + } >> + >> + mp_size_t itch = 3*SM2_LIMB_SIZE + ecc->mul_itch; mp_limb_t >> + *scratch = gmp_alloc_limbs (itch); mp_limb_t *pj = xalloc_limbs >> + (3*ecc->p.size); mp_limb_t *qj = xalloc_limbs (3*ecc->p.size); >> + ecc_a_to_j (ecc, pj, p->p); ecc_a_to_j (ecc, qj, q->p); >> + >> + ecc->add_hhh(p->ecc, scratch, pj, qj, scratch + 3*SM2_LIMB_SIZE); >> + ecc->h_to_a (ecc, 0, r->p, scratch, scratch + 3*SM2_LIMB_SIZE); >> + >> + gmp_free_limbs (scratch, itch); >> + free(pj); >> + free(qj); >> + return 1; >> +} >> diff --git a/sm2-internal.h b/sm2-internal.h new file mode 100644 >> index 0000000..adcc379 >> --- /dev/null >> +++ b/sm2-internal.h >> @@ -0,0 +1,69 @@ >> +/* sm2-internal.h >> + >> + Things that are used only by the testsuite and benchmark, and >> + not included in the library. > >Is that right? The file is included by library files, e.g., ecc-sm2.c. That’s not accurate, removed this. > >> + Copyright (c) Huawei Technologies Co., Ltd. 2022-2022. All rights reserved. >> + >> + This file is part of GNU Nettle. >> + >> + GNU Nettle is free software: you can redistribute it and/or >> + modify it under the terms of either: >> + >> + * the GNU Lesser General Public License as published by the Free >> + Software Foundation; either version 3 of the License, or (at your >> + option) any later version. >> + >> + or >> + >> + * the GNU General Public License as published by the Free >> + Software Foundation; either version 2 of the License, or (at your >> + option) any later version. >> + >> + or both in parallel, as here. >> + >> + GNU Nettle is distributed in the hope that it will be useful, >> + but WITHOUT ANY WARRANTY; without even the implied warranty of >> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU >> + General Public License for more details. >> + >> + You should have received copies of the GNU General Public License and >> + the GNU Lesser General Public License along with this program. If >> + not, see http://www.gnu.org/licenses/. >> +*/ >> + >> +#ifndef SM2_INTERNAL_H_INCLUDED >> +#define SM2_INTERNAL_H_INCLUDED >> + >> +#include <assert.h> >> + >> +#include "nettle-meta.h" >> + >> +#include "sm2.h" >> + >> +#ifdef __cplusplus >> +extern "C" { >> +#endif >> + >> +#define xalloc nettle_xalloc >> +#define xalloc_limbs nettle_xalloc_limbs >> + >> +#define SM2_LIMB_SIZE 4 >> +#define SM2_LIMB_BYTES 8 >> + >> +#define IS_ILLEG_KEY(key) \ >> + (!(key)) || (((key)->ecc) != &_nettle_sm2) || !((key)->p) >> + >> +extern const char *nettle_sm2_a; >> +extern const char *nettle_sm2_xG; >> +extern const char *nettle_sm2_yG; >> + >> +void *xalloc(size_t size); >> + >> +mp_limb_t *xalloc_limbs(mp_size_t n); > >Much of this looks questionable to me. SM2_LIMB_BYTES and SM2_LIMB_SIZE are machine dependent. Using corresponding elements of struct ecc_curve would be better than the nettle_sm2_a, nettle_sm2_xG and nettle_sm2_yG strings. (If there's no good place in the current struct ecc_curve to store the a constant, that should be added). Yep, this should be changed. ALL macros machine dependent moved, I tried add para a in ecc_curve. Here is a problem, in the point check of ecc_point_set and test_ecc_point_valid_p > >And xalloc functions are already defined for the testsuite and benchmark. Removed. > >> + >> +#ifdef __cplusplus >> +} >> +#endif >> + >> +#endif /* NETTLE_INTERNAL_H_INCLUDED */ >> diff --git a/sm2-lib.c b/sm2-lib.c >> new file mode 100644 >> index 0000000..0fefb20 >> --- /dev/null >> +++ b/sm2-lib.c >> @@ -0,0 +1,63 @@ >> +/* sm2-lib.c >> + >> + Things that are used only by the testsuite and benchmark, and >> + not included in the library. > >I'd prefer to not have this file. In particular, it's confusing with "lib" in the name when it's not part of the library. The description is not accurate, file removed. > >> + Copyright (c) Huawei Technologies Co., Ltd. 2022-2022. All rights reserved. >> + >> + This file is part of GNU Nettle. >> + >> + GNU Nettle is free software: you can redistribute it and/or >> + modify it under the terms of either: >> + >> + * the GNU Lesser General Public License as published by the Free >> + Software Foundation; either version 3 of the License, or (at your >> + option) any later version. >> + >> + or >> + >> + * the GNU General Public License as published by the Free >> + Software Foundation; either version 2 of the License, or (at your >> + option) any later version. >> + >> + or both in parallel, as here. >> + >> + GNU Nettle is distributed in the hope that it will be useful, >> + but WITHOUT ANY WARRANTY; without even the implied warranty of >> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU >> + General Public License for more details. >> + >> + You should have received copies of the GNU General Public License and >> + the GNU Lesser General Public License along with this program. If >> + not, see http://www.gnu.org/licenses/. >> +*/ >> + >> +#if HAVE_CONFIG_H >> +# include "config.h" >> +#endif >> + >> +#include <assert.h> >> +#include <stdlib.h> >> +#include <stdio.h> >> +#include <string.h> >> + >> +#include "sm2-internal.h" >> +#include "ecc-internal.h" >> + >> +void * >> +xalloc(size_t size) >> +{ >> + void *p = malloc(size); >> + if (size && !p) { >> + fprintf(stderr, "Virtual memory exhausted.\n"); >> + abort(); >> + } >> + >> + return p; >> +} >> + >> +mp_limb_t * >> +xalloc_limbs (mp_size_t n) >> +{ >> + return xalloc (n * sizeof (mp_limb_t)); } >> diff --git a/sm2-mul.c b/sm2-mul.c >> new file mode 100644 >> index 0000000..f65d196 >> --- /dev/null >> +++ b/sm2-mul.c >> @@ -0,0 +1,64 @@ >> +/* sm2-mul.c >> + >> + Copyright (c) Huawei Technologies Co., Ltd. 2022-2022. All rights reserved. >> + >> + This file is part of GNU Nettle. >> + >> + GNU Nettle is free software: you can redistribute it and/or >> + modify it under the terms of either: >> + >> + * the GNU Lesser General Public License as published by the Free >> + Software Foundation; either version 3 of the License, or (at your >> + option) any later version. >> + >> + or >> + >> + * the GNU General Public License as published by the Free >> + Software Foundation; either version 2 of the License, or (at your >> + option) any later version. >> + >> + or both in parallel, as here. >> + >> + GNU Nettle is distributed in the hope that it will be useful, >> + but WITHOUT ANY WARRANTY; without even the implied warranty of >> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU >> + General Public License for more details. >> + >> + You should have received copies of the GNU General Public License and >> + the GNU Lesser General Public License along with this program. If >> + not, see http://www.gnu.org/licenses/. >> +*/ >> + >> +#if HAVE_CONFIG_H >> +# include "config.h" >> +#endif >> + >> +#include <string.h> >> + >> +#include "ecc.h" >> +#include "ecc-internal.h" >> + >> +#include "sm2.h" >> +#include "sm2-internal.h" >> + >> +int >> +sm2_mul (struct ecc_point *q, const struct ecc_scalar *n, >> + const struct ecc_point *p) >> +{ >> + const struct ecc_curve *ecc = p->ecc; >> + if (!sm2_check_point(p)) { >> + return 0; >> + } >> + mp_size_t itch = 3*SM2_LIMB_SIZE + p->ecc->mul_itch; >> + mp_limb_t *scratch = gmp_alloc_limbs (itch); >> + >> + mp_limb_t *pj = xalloc_limbs (3*SM2_LIMB_SIZE); ecc_a_to_j >> + (p->ecc, pj, p->p); >> + >> + p->ecc->mul(p->ecc, scratch, n->p, pj, scratch + 3*SM2_LIMB_SIZE); >> + p->ecc->h_to_a (p->ecc, 0, q->p, scratch, scratch + >> + 3*SM2_LIMB_SIZE); >> + >> + gmp_free_limbs (scratch, itch); >> + free(pj); >> + return 1; >> +} > >I think the general ecc_point_mul (and other ecc_point_* functions) should be used also for sm2. The validation done by sm2_check_point should go in ecc_point_set (currently, handling various curves in that function is a bit messy handling, it would make sense to add a function pointer in ecc_curve for doing the point validation. These encapsulations are removed. Add an ecc_point_check function from ecc_point_set, I wonder is there necessary to add a function pointer in ecc_curve? > >> diff --git a/sm2-point.c b/sm2-point.c new file mode 100644 index >> 0000000..0146692 >> --- /dev/null >> +++ b/sm2-point.c >> @@ -0,0 +1,105 @@ >> +/* sm2-point.c >> + >> + Copyright (c) Huawei Technologies Co., Ltd. 2022-2022. All rights reserved. >> + >> + This file is part of GNU Nettle. >> + >> + GNU Nettle is free software: you can redistribute it and/or >> + modify it under the terms of either: >> + >> + * the GNU Lesser General Public License as published by the Free >> + Software Foundation; either version 3 of the License, or (at your >> + option) any later version. >> + >> + or >> + >> + * the GNU General Public License as published by the Free >> + Software Foundation; either version 2 of the License, or (at your >> + option) any later version. >> + >> + or both in parallel, as here. >> + >> + GNU Nettle is distributed in the hope that it will be useful, >> + but WITHOUT ANY WARRANTY; without even the implied warranty of >> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU >> + General Public License for more details. >> + >> + You should have received copies of the GNU General Public License and >> + the GNU Lesser General Public License along with this program. If >> + not, see http://www.gnu.org/licenses/. >> +*/ >> + >> +#if HAVE_CONFIG_H >> +# include "config.h" >> +#endif >> + >> +#include <stdio.h> >> +#include <string.h> >> +#include <stdlib.h> >> + >> +#include "ecc.h" >> +#include "ecc-internal.h" >> + >> +#include "sm2.h" >> +#include "sm2-internal.h" >> + >> +int >> +sm2_check_point(const struct ecc_point *point) { >> + mpz_t t, x, y, a; >> + mpz_t lhs, rhs; >> + int res; >> + mp_size_t size; >> + >> + if (IS_ILLEG_KEY(point) != 0) >> + return 0; >> + >> + size = point->ecc->p.size; >> + >> + /* First check range */ >> + if (mpn_cmp (point->p, point->ecc->p.m, size) >= 0 >> + || mpn_cmp (point->p + size, point->ecc->p.m, size) >= 0) >> + return 0; >> + >> + mpz_init (lhs); >> + mpz_init (rhs); >> + >> + mpz_init_set_str(a, nettle_sm2_a, 16); mpz_roinit_n (x, point->p, >> + size); mpz_roinit_n (y, point->p + size, size); >> + >> + mpz_mul (lhs, y, y); >> + >> + /* Check y^2 = x^3 + ax + b */ >> + mpz_mul (rhs, x, x); >> + mpz_add (rhs, rhs, a); >> + mpz_mul (rhs, rhs, x); >> + mpz_add (rhs, rhs, mpz_roinit_n (t, point->ecc->b, size)); >> + >> + res = mpz_congruent_p (lhs, rhs, mpz_roinit_n (t, point->ecc->p.m, >> + size)); >> + >> + mpz_clear (lhs); >> + mpz_clear (rhs); >> + mpz_clear (a); >> + >> + return res; >> +} >> + >> +int >> +sm2_point_set (struct ecc_point *p, const mpz_t x, const mpz_t y) { >> + if (p == NULL || p->p == NULL || x == NULL || y == NULL) >> + return 0; >> + >> + p->ecc = &_nettle_sm2; >> + mp_size_t size = p->ecc->p.size; >> + >> + mpz_limbs_copy (p->p, x, size); >> + mpz_limbs_copy (p->p + size, y, size); >> + >> + if (!sm2_check_point(p)) { >> + return 0; >> + } >> + >> + return 1; >> +} >> diff --git a/sm2.h b/sm2.h >> new file mode 100644 >> index 0000000..1443b68 >> --- /dev/null >> +++ b/sm2.h >> @@ -0,0 +1,65 @@ >> +/* sm2.h >> + Copyright (c) Huawei Technologies Co., Ltd. 2022-2022. All rights reserved. >> + This file is part of GNU Nettle. >> + GNU Nettle is free software: you can redistribute it and/or >> + modify it under the terms of either: >> + * the GNU Lesser General Public License as published by the Free >> + Software Foundation; either version 3 of the License, or (at your >> + option) any later version. >> + or >> + * the GNU General Public License as published by the Free >> + Software Foundation; either version 2 of the License, or (at your >> + option) any later version. >> + or both in parallel, as here. >> + GNU Nettle is distributed in the hope that it will be useful, >> + but WITHOUT ANY WARRANTY; without even the implied warranty of >> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU >> + General Public License for more details. >> + You should have received copies of the GNU General Public License and >> + the GNU Lesser General Public License along with this program. If >> + not, see http://www.gnu.org/licenses/. >> +*/ >> + >> +#ifndef NETTLE_SM2_H_INCLUDED >> +#define NETTLE_SM2_H_INCLUDED >> + >> +#include "nettle-types.h" >> +#include "nettle-meta.h" >> + >> +#include "ecc.h" >> + >> +#ifdef __cplusplus >> +extern "C" { >> +#endif >> + >> +#define sm2_get_order nettle_sm2_get_order #define sm2_check_point >> +nettle_sm2_check_point #define sm2_point_set nettle_sm2_point_set >> +#define sm2_add nettle_sm2_add #define sm2_mul nettle_sm2_mul >> + >> +void >> +sm2_get_order(mpz_t order); >> + >> +int >> +sm2_check_point(const struct ecc_point *point); >> + >> +int >> +sm2_point_set (struct ecc_point *p, const mpz_t x, const mpz_t y); >> + >> +int >> +sm2_add (struct ecc_point *r, const struct ecc_point *p, >> + const struct ecc_point *q); >> + >> +int >> +sm2_mul (struct ecc_point *q, const struct ecc_scalar *n, >> + const struct ecc_point *p); > >There are no curve-specific public functions like this for any of the other curves, so it would be nice if we could eliminate them and just use the ecc_point_* functions. Sure. > >> +const struct ecc_curve * _NETTLE_ATTRIBUTE_PURE >> +nettle_get_sm2(void); > >I think this declaration belongs in ecc_curve.h. Moved. > >> +#ifdef __cplusplus >> +} >> +#endif >> + >> +#endif /* NETTLE_SM2_H_INCLUDED */ >> + >> diff --git a/testsuite/Makefile.in b/testsuite/Makefile.in index >> c266282..6bda2b7 100644 >> --- a/testsuite/Makefile.in >> +++ b/testsuite/Makefile.in >> @@ -56,7 +56,8 @@ TS_HOGWEED_SOURCES = sexp-test.c sexp-format-test.c \ >> eddsa-compress-test.c eddsa-sign-test.c \ >> eddsa-verify-test.c ed25519-test.c ed448-test.c \ >> gostdsa-sign-test.c gostdsa-verify-test.c \ >> - gostdsa-keygen-test.c gostdsa-vko-test.c >> + gostdsa-keygen-test.c gostdsa-vko-test.c \ >> + sm2-base-test.c \ >> >> TS_SOURCES = $(TS_NETTLE_SOURCES) $(TS_HOGWEED_SOURCES) CXX_SOURCES >> = cxx-test.cxx diff --git a/testsuite/sm2-base-test.c >> b/testsuite/sm2-base-test.c new file mode 100644 index >> 0000000..be03970 >> --- /dev/null >> +++ b/testsuite/sm2-base-test.c >> @@ -0,0 +1,161 @@ >> +#include "testutils.h" >> + >> +char *order = >> +"fffffffeffffffffffffffffffffffff7203df6b21c6052b53bbf40939d54123"; > >If you add sm2 to the list ecc_curves in testutils.c, existing ecc tests will test sm2 as well. You will need to also update the test_ecc_point_valid_p function and the ecc_ref list in the same file. Already added, seemed the ecc_mod is not compatible with sm2, I'm trying to figured out. > >> +char *pkey = >> +"81a2088f008d0e28dd4add66041cf1050cbaf053ab48f4284eb701152be5c310"; >> +char *xG = >> +"8ffdbc04ac27f21a41c878e171294962150fa9b3dece424d41abfa869260bbf0"; >> +char *yG = >> +"a6648a20e162a7ac07597f199d722ff965cfdfab1744aed669565b11bcf15cfe"; >> +char *xR = >> +"3e5641b3e68eb47e6fae1271057e1ea0faedbb49df0d690722eaca6e45f5a76c"; >> +char *yR = >> +"d0b0bf0d16a1e4dbc814a6e7b53c07a84997660b7ed0fa0cdeb93bf12000cdf6"; >> + >> +char *Px = >> +"8070905f2cf1118ec1d41a0d07dd8dd4ac663bdbe4ad85df101d0baa875d4699"; >> +char *Py = >> +"5a947c2c3b2a4bf6113e4e609190209b64f672ddca99b6a7dbf55e2fbf7019a3"; >> +char *Qx = >> +"3dd60d9474b46d903f3daf7f532eb9e81a5ea97e2676dfca39493a218a223feb"; >> +char *Qy = >> +"dd8fe0b3cf91c793d1df27a30f707d5d46b170478e210de110f6954749b40994"; >> +char *Rx = >> +"df86af4b5b7830ac4d6730e93bc3a4dd67e303c3e2824eb76dc61b26e2884f7f"; >> +char *Ry = >> +"23d8e385c6f7aea20d38df11de924427b3cea394e648e4b19b4ba086addc490a"; >> + >> +char *gx = >> +"32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7"; >> +char *gy = >> +"BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0"; >> + >> +void sm2_point_print (struct ecc_point *p); void test_get_order >> +(void); void test_add (void); void test_mul (void); >> + >> +void >> +sm2_point_print (struct ecc_point *p) { >> + char str[1024]; >> + mpz_t x, y; >> + mpz_init (x); >> + mpz_init (y); >> + ecc_point_get(p, x, y); >> + mpz_get_str(str, 16, x); >> + printf("Px : %s\n", str); >> + mpz_get_str(str, 16, y); >> + printf("Py : %s\n", str); >> + mpz_clear(x); >> + mpz_clear(y); >> +} >> + >> +void >> +test_get_order (void) >> +{ >> + int ret = 0; >> + mpz_t r, R; >> + >> + mpz_init(r); >> + mpz_init_set_str(R, order, 16); >> + >> + sm2_get_order(r); >> + >> + ret = mpz_cmp(r, R); >> + ASSERT(ret == 0); >> + >> + mpz_clear(r); >> + mpz_clear(R); >> +} >> + >> +void >> +test_get_order_NULL (void) >> +{ >> + mpz_t r; >> + >> + mpz_init(r); >> + >> + r->_mp_d = NULL; >> + sm2_get_order(r); >> + >> + mpz_clear(r); >> +} >> + >> +void >> +test_add (void) >> +{ >> + int ret = 0; >> + const struct ecc_curve *ecc = nettle_get_sm2(); >> + struct ecc_point pointp, pointq, Res; >> + mpz_t x, y; >> + >> + ecc_point_init (&pointp, ecc); >> + ecc_point_init (&pointq, ecc); >> + ecc_point_init (&Res, ecc); >> + mpz_init (x); >> + mpz_init (y); >> + mpz_set_str(x, Px, 16); >> + mpz_set_str(y, Py, 16); >> + sm2_point_set(&pointp, x, y); >> + mpz_set_str(x, Qx, 16); >> + mpz_set_str(y, Qy, 16); >> + sm2_point_set(&pointq, x, y); >> + >> + sm2_add(&Res, &pointp, &pointq); >> + >> + if (verbose) >> + sm2_point_print (&Res); >> + >> + mpz_set_str(x, Rx, 16); >> + mpz_set_str(y, Ry, 16); >> + sm2_point_set(&pointq, x, y); >> + >> + ret = mpn_cmp(Res.p, pointq.p, SM2_LIMB_BYTES); ASSERT(ret == 0); >> + >> + ecc_point_clear(&pointp); >> + ecc_point_clear(&pointq); >> + ecc_point_clear(&Res); >> + mpz_clear (x); >> + mpz_clear (y); >> +} >> + >> +void >> +test_mul (void) >> +{ >> + int ret = 0; >> + const struct ecc_curve *ecc = nettle_get_sm2(); >> + struct ecc_point pub, pr, Res; >> + struct ecc_scalar key; >> + mpz_t x, y; >> + >> + ecc_point_init (&pub, ecc); >> + ecc_point_init (&pr, ecc); >> + ecc_point_init (&Res, ecc); >> + ecc_scalar_init (&key, ecc); >> + mpz_init (x); >> + mpz_init (y); >> + >> + mpz_set_str(x, pkey, 16); >> + ecc_scalar_set(&key, x); >> + mpz_set_str(x, xG, 16); >> + mpz_set_str(y, yG, 16); >> + sm2_point_set(&pub, x, y); >> + >> + sm2_mul(&pr, &key, &pub); >> + >> + if (verbose) >> + sm2_point_print (&pr); >> + >> + mpz_set_str(x, xR, 16); >> + mpz_set_str(y, yR, 16); >> + sm2_point_set(&Res, x, y); >> + >> + ret = mpn_cmp(Res.p, pr.p, SM2_LIMB_BYTES); ASSERT(ret == 0); >> + >> + ecc_point_clear(&pub); >> + ecc_point_clear(&pr); >> + ecc_point_clear(&Res); >> + ecc_scalar_clear(&key); >> + mpz_clear (x); >> + mpz_clear (y); >> +} >> + >> +void >> +test_main (void) >> +{ >> + test_get_order(); >> + test_get_order_NULL(); >> + test_add(); >> + test_mul(); >> +} >> diff --git a/testsuite/testutils.h b/testsuite/testutils.h index >> 3e23978..c2cf5e1 100644 >> --- a/testsuite/testutils.h >> +++ b/testsuite/testutils.h >> @@ -22,6 +22,8 @@ >> # include "ecc.h" >> # include "ecc-internal.h" >> # include "ecdsa.h" >> +# include "sm2.h" >> +# include "sm2-internal.h" >> # include "gmp-glue.h" >> # if NETTLE_USE_MINI_GMP >> # include "knuth-lfib.h" > >-- >Niels Möller. PGP key CB4962D070D77D7FCB8BA36271D8F1FF368C6677. >Internet email is subject to wholesale government surveillance. > >

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Re: ppc64: v2, AES/GCM Performance improvement with stitched implementation
by Danny Tsen 15 Jan '24

15 Jan '24

Hi Niels, Here is the version 2 for AES/GCM stitched patch. The stitched code is in all assembly and m4 macros are used. The overall performance improved around ~110% and 120% for encrypt and decrypt respectably. Please see the attached patch and aes benchmark. Thanks. -Danny > On Nov 22, 2023, at 2:27 AM, Niels Möller <nisse(a)lysator.liu.se> wrote: > > Danny Tsen <dtsen(a)us.ibm.com> writes: > >> Interleaving at the instructions level may be a good option but due to >> PPC instruction pipeline this may need to have sufficient >> registers/vectors. Use same vectors to change contents in successive >> instructions may require more cycles. In that case, more >> vectors/scalar will get involved and all vectors assignment may have >> to change. That’s the reason I avoided in this case. > > To investigate the potential, I would suggest some experiments with > software pipelining. > > Write a loop to do 4 blocks of ctr-aes128 at a time, fully unrolling the > round loop. I think that should be 44 instructions of aes mangling, plus > instructions to setup the counter input, and do the final xor and > endianness things with the message. Arrange so that it loads the AES > state in a set of registers we can call A, operating in-place on these > registers. But at the end, arrange the XORing so that the final > cryptotext is located in a different set of registers, B. > > Then, write the instructions to do ghash using the B registers as input, > I think that should be about 20-25 instructions. Interleave those as > well as possible with the AES instructions (say, two aes instructions, > one ghash instruction, etc). > > Software pipelining means that each iteration of the loop does aes-ctr > on four blocks, + ghash on the output for the four *previous* blocks (so > one needs extra code outside of the loop to deal with first and last 4 > blocks). Decrypt processing should be simpler. > > Then you can benchmark that loop in isolation. It doesn't need to be the > complete function, the handling of first and last blocks can be omitted, > and it doesn't even have to be completely correct, as long as it's the > right instruction mix and the right data dependencies. The benchmark > should give a good idea for the potential speedup, if any, from > instruction-level interleaving. > > I would hope 4-way is doable with available vector registers (and this > inner loop should be less than 100 instructions, so not too > unmanageable). Going up to 8-way (like the current AES code) would also > be interesting, but as you say, you might have a shortage of registers. > If you have to copy state between registers and memory in each iteration > of an 8-way loop (which it looks like you also have to do in your > current patch), that overhead cost may outweight the gains you have from > more independence in the AES rounds. > > Regards, > /Niels > > -- > Niels Möller. PGP key CB4962D070D77D7FCB8BA36271D8F1FF368C6677. > Internet email is subject to wholesale government surveillance.

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Re: Deleting obsolete assembly files?
by Niels Möller 08 Dec '23

08 Dec '23

nisse(a)lysator.liu.se (Niels Möller) writes: > Simon Josefsson <simon(a)josefsson.org> writes: > >> Also, remember that Niels proposal is not about removing these >> algorithms, just dropping the assembler variant. So they will continue >> to work fine on these platforms, but will take advantage of more code >> scrutiny. I think that is a reasonable trade-off. > And the only architectures that currently have any md5 assembly is x86 > and x86_64. On my x86_64 laptop, I see a rather modest performance gain > of about 6% over the C version. I don't expect anyone willing to work on > improved md5 performance, on x86_64 or on additional platforms. Getting back to this thread. I've pushed a change to delete md5 assembly on branch delete-md5-asm, for testing. I don't think carrying md5 assembly code is worth the complexity. The arcfour assembly was deleted in the 3.9 release. Deletion candidates remaining: 32-bit x86 (aes (non-aesni), sha1, camellia). 32-bit sparc. 32-bit ARM prior to ARMv6. Possibly also 64-bit sparc; currently, only sparc64-assembly is for aes, written in 2007 based on the sparc32 code. So unclear how relevant it is for current sparc processors). Regards, /Niels -- Niels Möller. PGP key CB4962D070D77D7FCB8BA36271D8F1FF368C6677. Internet email is subject to wholesale government surveillance.

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Re: [PATCH] Add DRBG-CTR-AES256.
by Niels Möller 06 Dec '23

06 Dec '23

Simon Josefsson <simon(a)josefsson.org> writes: > Please release 3.9 before looking at this! :-) > > This adds DRBG-CTR-AES256, what do you think? I've merged this onto a branch add-drbg-ctr-aes256. I've made some additional changes: use union nettle_block16 where that made sense, rename Key -> key, fixed typo in testsite/Makefile, and extracted the output logic to its own helper function. It could be optimized to call aes256_encrypt with more than one block at a time, when possible, but probably not worth the extra complexity. Please have a look. For your sntrup761 patch that depends on this, will you be doing any more work on that in the near future? In the meantime, I've reworked the testing for side-channel silence, so it should be rather straight-forward to add such tests for sntrup761. Regards, /Niels -- Niels Möller. PGP key CB4962D070D77D7FCB8BA36271D8F1FF368C6677. Internet email is subject to wholesale government surveillance.

1 0

Patch to detect on CPU capabilities on Apple Silicon
by Tim Kosse 05 Dec '23

05 Dec '23

Hi, after building Nettle natively for Apple devices running Apple Silicon, I noticed a drastic performance different between the native build, and an x86_64 build emulated via Apple's Rosetta. The latter, despite emulation, was over 10 times faster in some algorithms, e.g. AES-128-GCM. I found out that get_arm64_features did not at all detect the CPU capabilities on Apple devices. The attached patch fixes the issue for me, with it in place the CPU features are correctly detected. AES-128-GCM benchmark results: Native (pre-patch): 200MB/s Emulated: 3.2GB/s Native (patched): 5.2GB/s Regards, Tim Kosse

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