2 * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 * EC_METHOD low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
18 #include <openssl/err.h>
19 #include <openssl/rand.h>
21 #include "s390x_arch.h"
23 /* Size of parameter blocks */
24 #define S390X_SIZE_PARAM 4096
26 /* Size of fields in parameter blocks */
27 #define S390X_SIZE_P256 32
28 #define S390X_SIZE_P384 48
29 #define S390X_SIZE_P521 80
31 /* Offsets of fields in PCC parameter blocks */
32 #define S390X_OFF_RES_X(n) (0 * n)
33 #define S390X_OFF_RES_Y(n) (1 * n)
34 #define S390X_OFF_SRC_X(n) (2 * n)
35 #define S390X_OFF_SRC_Y(n) (3 * n)
36 #define S390X_OFF_SCALAR(n) (4 * n)
38 /* Offsets of fields in KDSA parameter blocks */
39 #define S390X_OFF_R(n) (0 * n)
40 #define S390X_OFF_S(n) (1 * n)
41 #define S390X_OFF_H(n) (2 * n)
42 #define S390X_OFF_K(n) (3 * n)
43 #define S390X_OFF_X(n) (3 * n)
44 #define S390X_OFF_RN(n) (4 * n)
45 #define S390X_OFF_Y(n) (4 * n)
47 static int ec_GFp_s390x_nistp_mul(const EC_GROUP *group, EC_POINT *r,
49 size_t num, const EC_POINT *points[],
50 const BIGNUM *scalars[],
51 BN_CTX *ctx, unsigned int fc, int len)
53 unsigned char param[S390X_SIZE_PARAM];
55 const EC_POINT *point_ptr = NULL;
56 const BIGNUM *scalar_ptr = NULL;
57 BN_CTX *new_ctx = NULL;
61 ctx = new_ctx = BN_CTX_new_ex(group->libctx);
70 if (x == NULL || y == NULL) {
76 * Use PCC for EC keygen and ECDH key derivation:
77 * scalar * generator and scalar * peer public key,
78 * scalar in [0,order).
80 if ((scalar != NULL && num == 0 && BN_is_negative(scalar) == 0)
81 || (scalar == NULL && num == 1 && BN_is_negative(scalars[0]) == 0)) {
84 point_ptr = EC_GROUP_get0_generator(group);
87 point_ptr = points[0];
88 scalar_ptr = scalars[0];
91 if (EC_POINT_is_at_infinity(group, point_ptr) == 1
92 || BN_is_zero(scalar_ptr)) {
93 rc = EC_POINT_set_to_infinity(group, r);
97 memset(¶m, 0, sizeof(param));
99 if (group->meth->point_get_affine_coordinates(group, point_ptr,
101 || BN_bn2binpad(x, param + S390X_OFF_SRC_X(len), len) == -1
102 || BN_bn2binpad(y, param + S390X_OFF_SRC_Y(len), len) == -1
103 || BN_bn2binpad(scalar_ptr,
104 param + S390X_OFF_SCALAR(len), len) == -1
105 || s390x_pcc(fc, param) != 0
106 || BN_bin2bn(param + S390X_OFF_RES_X(len), len, x) == NULL
107 || BN_bin2bn(param + S390X_OFF_RES_Y(len), len, y) == NULL
108 || group->meth->point_set_affine_coordinates(group, r,
116 /* Otherwise use default. */
118 rc = ossl_ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
119 OPENSSL_cleanse(param + S390X_OFF_SCALAR(len), len);
121 BN_CTX_free(new_ctx);
125 static ECDSA_SIG *ecdsa_s390x_nistp_sign_sig(const unsigned char *dgst,
130 unsigned int fc, int len)
132 unsigned char param[S390X_SIZE_PARAM];
136 const EC_GROUP *group;
137 const BIGNUM *privkey;
140 group = EC_KEY_get0_group(eckey);
141 privkey = EC_KEY_get0_private_key(eckey);
142 if (group == NULL || privkey == NULL) {
143 ERR_raise(ERR_LIB_EC, EC_R_MISSING_PARAMETERS);
147 if (!EC_KEY_can_sign(eckey)) {
148 ERR_raise(ERR_LIB_EC, EC_R_CURVE_DOES_NOT_SUPPORT_SIGNING);
153 sig = ECDSA_SIG_new();
154 if (k == NULL || sig == NULL) {
155 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
161 if (sig->r == NULL || sig->s == NULL) {
162 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
166 memset(param, 0, sizeof(param));
167 off = len - (dgstlen > len ? len : dgstlen);
168 memcpy(param + S390X_OFF_H(len) + off, dgst, len - off);
170 if (BN_bn2binpad(privkey, param + S390X_OFF_K(len), len) == -1) {
171 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
175 if (r == NULL || kinv == NULL) {
177 * Generate random k and copy to param param block. RAND_priv_bytes_ex
178 * is used instead of BN_priv_rand_range or BN_generate_dsa_nonce
179 * because kdsa instruction constructs an in-range, invertible nonce
180 * internally implementing counter-measures for RNG weakness.
182 if (RAND_priv_bytes_ex(eckey->libctx, param + S390X_OFF_RN(len),
184 ERR_raise(ERR_LIB_EC, EC_R_RANDOM_NUMBER_GENERATION_FAILED);
188 /* Reconstruct k = (k^-1)^-1. */
189 if (ossl_ec_group_do_inverse_ord(group, k, kinv, NULL) == 0
190 || BN_bn2binpad(k, param + S390X_OFF_RN(len), len) == -1) {
191 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
194 /* Turns KDSA internal nonce-generation off. */
198 if (s390x_kdsa(fc, param, NULL, 0) != 0) {
199 ERR_raise(ERR_LIB_EC, ERR_R_ECDSA_LIB);
203 if (BN_bin2bn(param + S390X_OFF_R(len), len, sig->r) == NULL
204 || BN_bin2bn(param + S390X_OFF_S(len), len, sig->s) == NULL) {
205 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
211 OPENSSL_cleanse(param + S390X_OFF_K(len), 2 * len);
220 static int ecdsa_s390x_nistp_verify_sig(const unsigned char *dgst, int dgstlen,
221 const ECDSA_SIG *sig, EC_KEY *eckey,
222 unsigned int fc, int len)
224 unsigned char param[S390X_SIZE_PARAM];
228 const EC_GROUP *group;
229 const EC_POINT *pubkey;
232 group = EC_KEY_get0_group(eckey);
233 pubkey = EC_KEY_get0_public_key(eckey);
234 if (eckey == NULL || group == NULL || pubkey == NULL || sig == NULL) {
235 ERR_raise(ERR_LIB_EC, EC_R_MISSING_PARAMETERS);
239 if (!EC_KEY_can_sign(eckey)) {
240 ERR_raise(ERR_LIB_EC, EC_R_CURVE_DOES_NOT_SUPPORT_SIGNING);
244 ctx = BN_CTX_new_ex(group->libctx);
246 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
254 if (x == NULL || y == NULL) {
255 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
259 memset(param, 0, sizeof(param));
260 off = len - (dgstlen > len ? len : dgstlen);
261 memcpy(param + S390X_OFF_H(len) + off, dgst, len - off);
263 if (group->meth->point_get_affine_coordinates(group, pubkey,
265 || BN_bn2binpad(sig->r, param + S390X_OFF_R(len), len) == -1
266 || BN_bn2binpad(sig->s, param + S390X_OFF_S(len), len) == -1
267 || BN_bn2binpad(x, param + S390X_OFF_X(len), len) == -1
268 || BN_bn2binpad(y, param + S390X_OFF_Y(len), len) == -1) {
269 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
273 rc = s390x_kdsa(fc, param, NULL, 0) == 0 ? 1 : 0;
280 #define EC_GFP_S390X_NISTP_METHOD(bits) \
282 static int ec_GFp_s390x_nistp##bits##_mul(const EC_GROUP *group, \
284 const BIGNUM *scalar, \
286 const EC_POINT *points[], \
287 const BIGNUM *scalars[], \
290 return ec_GFp_s390x_nistp_mul(group, r, scalar, num, points, \
292 S390X_SCALAR_MULTIPLY_P##bits, \
293 S390X_SIZE_P##bits); \
296 static ECDSA_SIG *ecdsa_s390x_nistp##bits##_sign_sig(const unsigned \
303 return ecdsa_s390x_nistp_sign_sig(dgst, dgstlen, kinv, r, eckey, \
304 S390X_ECDSA_SIGN_P##bits, \
305 S390X_SIZE_P##bits); \
308 static int ecdsa_s390x_nistp##bits##_verify_sig(const \
309 unsigned char *dgst, \
311 const ECDSA_SIG *sig, \
314 return ecdsa_s390x_nistp_verify_sig(dgst, dgstlen, sig, eckey, \
315 S390X_ECDSA_VERIFY_P##bits, \
316 S390X_SIZE_P##bits); \
319 const EC_METHOD *EC_GFp_s390x_nistp##bits##_method(void) \
321 static const EC_METHOD EC_GFp_s390x_nistp##bits##_meth = { \
322 EC_FLAGS_DEFAULT_OCT, \
323 NID_X9_62_prime_field, \
324 ossl_ec_GFp_simple_group_init, \
325 ossl_ec_GFp_simple_group_finish, \
326 ossl_ec_GFp_simple_group_clear_finish, \
327 ossl_ec_GFp_simple_group_copy, \
328 ossl_ec_GFp_simple_group_set_curve, \
329 ossl_ec_GFp_simple_group_get_curve, \
330 ossl_ec_GFp_simple_group_get_degree, \
331 ossl_ec_group_simple_order_bits, \
332 ossl_ec_GFp_simple_group_check_discriminant, \
333 ossl_ec_GFp_simple_point_init, \
334 ossl_ec_GFp_simple_point_finish, \
335 ossl_ec_GFp_simple_point_clear_finish, \
336 ossl_ec_GFp_simple_point_copy, \
337 ossl_ec_GFp_simple_point_set_to_infinity, \
338 ossl_ec_GFp_simple_point_set_affine_coordinates, \
339 ossl_ec_GFp_simple_point_get_affine_coordinates, \
340 NULL, /* point_set_compressed_coordinates */ \
341 NULL, /* point2oct */ \
342 NULL, /* oct2point */ \
343 ossl_ec_GFp_simple_add, \
344 ossl_ec_GFp_simple_dbl, \
345 ossl_ec_GFp_simple_invert, \
346 ossl_ec_GFp_simple_is_at_infinity, \
347 ossl_ec_GFp_simple_is_on_curve, \
348 ossl_ec_GFp_simple_cmp, \
349 ossl_ec_GFp_simple_make_affine, \
350 ossl_ec_GFp_simple_points_make_affine, \
351 ec_GFp_s390x_nistp##bits##_mul, \
352 NULL, /* precompute_mult */ \
353 NULL, /* have_precompute_mult */ \
354 ossl_ec_GFp_simple_field_mul, \
355 ossl_ec_GFp_simple_field_sqr, \
356 NULL, /* field_div */ \
357 ossl_ec_GFp_simple_field_inv, \
358 NULL, /* field_encode */ \
359 NULL, /* field_decode */ \
360 NULL, /* field_set_to_one */ \
361 ossl_ec_key_simple_priv2oct, \
362 ossl_ec_key_simple_oct2priv, \
363 NULL, /* set_private */ \
364 ossl_ec_key_simple_generate_key, \
365 ossl_ec_key_simple_check_key, \
366 ossl_ec_key_simple_generate_public_key, \
367 NULL, /* keycopy */ \
368 NULL, /* keyfinish */ \
369 ossl_ecdh_simple_compute_key, \
370 ossl_ecdsa_simple_sign_setup, \
371 ecdsa_s390x_nistp##bits##_sign_sig, \
372 ecdsa_s390x_nistp##bits##_verify_sig, \
373 NULL, /* field_inverse_mod_ord */ \
374 ossl_ec_GFp_simple_blind_coordinates, \
375 ossl_ec_GFp_simple_ladder_pre, \
376 ossl_ec_GFp_simple_ladder_step, \
377 ossl_ec_GFp_simple_ladder_post \
379 static const EC_METHOD *ret; \
381 if ((OPENSSL_s390xcap_P.pcc[1] \
382 & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_P##bits)) \
383 && (OPENSSL_s390xcap_P.kdsa[0] \
384 & S390X_CAPBIT(S390X_ECDSA_VERIFY_P##bits)) \
385 && (OPENSSL_s390xcap_P.kdsa[0] \
386 & S390X_CAPBIT(S390X_ECDSA_SIGN_P##bits))) \
387 ret = &EC_GFp_s390x_nistp##bits##_meth; \
389 ret = EC_GFp_mont_method(); \
394 EC_GFP_S390X_NISTP_METHOD(256)
395 EC_GFP_S390X_NISTP_METHOD(384)
396 EC_GFP_S390X_NISTP_METHOD(521)