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)