1 /*
2 * Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved.
3 *
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
8 */
9
10 #include <openssl/crypto.h>
11 #include <openssl/core_dispatch.h>
12 #include <openssl/core_names.h>
13 #include <openssl/err.h>
14 #include <openssl/params.h>
15 #include <openssl/evp.h>
16 #include <openssl/err.h>
17 #include <openssl/proverr.h>
18 #include "internal/nelem.h"
19 #include "internal/sizes.h"
20 #include "prov/providercommon.h"
21 #include "prov/implementations.h"
22 #include "prov/provider_ctx.h"
23 #include "prov/der_ecx.h"
24 #include "crypto/ecx.h"
25
26 #ifdef S390X_EC_ASM
27 # include "s390x_arch.h"
28
29 # define S390X_CAN_SIGN(edtype) \
30 ((OPENSSL_s390xcap_P.pcc[1] & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_##edtype)) \
31 && (OPENSSL_s390xcap_P.kdsa[0] & S390X_CAPBIT(S390X_EDDSA_SIGN_##edtype)) \
32 && (OPENSSL_s390xcap_P.kdsa[0] & S390X_CAPBIT(S390X_EDDSA_VERIFY_##edtype)))
33
34 static int s390x_ed25519_digestsign(const ECX_KEY *edkey, unsigned char *sig,
35 const unsigned char *tbs, size_t tbslen);
36 static int s390x_ed448_digestsign(const ECX_KEY *edkey, unsigned char *sig,
37 const unsigned char *tbs, size_t tbslen);
38 static int s390x_ed25519_digestverify(const ECX_KEY *edkey,
39 const unsigned char *sig,
40 const unsigned char *tbs, size_t tbslen);
41 static int s390x_ed448_digestverify(const ECX_KEY *edkey,
42 const unsigned char *sig,
43 const unsigned char *tbs, size_t tbslen);
44
45 #endif /* S390X_EC_ASM */
46
47 static OSSL_FUNC_signature_newctx_fn eddsa_newctx;
48 static OSSL_FUNC_signature_digest_sign_init_fn eddsa_digest_signverify_init;
49 static OSSL_FUNC_signature_digest_sign_fn ed25519_digest_sign;
50 static OSSL_FUNC_signature_digest_sign_fn ed448_digest_sign;
51 static OSSL_FUNC_signature_digest_verify_fn ed25519_digest_verify;
52 static OSSL_FUNC_signature_digest_verify_fn ed448_digest_verify;
53 static OSSL_FUNC_signature_freectx_fn eddsa_freectx;
54 static OSSL_FUNC_signature_dupctx_fn eddsa_dupctx;
55 static OSSL_FUNC_signature_get_ctx_params_fn eddsa_get_ctx_params;
56 static OSSL_FUNC_signature_gettable_ctx_params_fn eddsa_gettable_ctx_params;
57
58 typedef struct {
59 OSSL_LIB_CTX *libctx;
60 ECX_KEY *key;
61
62 /* The Algorithm Identifier of the signature algorithm */
63 unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
64 unsigned char *aid;
65 size_t aid_len;
66 } PROV_EDDSA_CTX;
67
eddsa_newctx(void * provctx,const char * propq_unused)68 static void *eddsa_newctx(void *provctx, const char *propq_unused)
69 {
70 PROV_EDDSA_CTX *peddsactx;
71
72 if (!ossl_prov_is_running())
73 return NULL;
74
75 peddsactx = OPENSSL_zalloc(sizeof(PROV_EDDSA_CTX));
76 if (peddsactx == NULL) {
77 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
78 return NULL;
79 }
80
81 peddsactx->libctx = PROV_LIBCTX_OF(provctx);
82
83 return peddsactx;
84 }
85
eddsa_digest_signverify_init(void * vpeddsactx,const char * mdname,void * vedkey,ossl_unused const OSSL_PARAM params[])86 static int eddsa_digest_signverify_init(void *vpeddsactx, const char *mdname,
87 void *vedkey,
88 ossl_unused const OSSL_PARAM params[])
89 {
90 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
91 ECX_KEY *edkey = (ECX_KEY *)vedkey;
92 WPACKET pkt;
93 int ret;
94
95 if (!ossl_prov_is_running())
96 return 0;
97
98 if (mdname != NULL && mdname[0] != '\0') {
99 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST);
100 return 0;
101 }
102
103 if (edkey == NULL) {
104 if (peddsactx->key != NULL)
105 /* there is nothing to do on reinit */
106 return 1;
107 ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);
108 return 0;
109 }
110
111 if (!ossl_ecx_key_up_ref(edkey)) {
112 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
113 return 0;
114 }
115
116 /*
117 * We do not care about DER writing errors.
118 * All it really means is that for some reason, there's no
119 * AlgorithmIdentifier to be had, but the operation itself is
120 * still valid, just as long as it's not used to construct
121 * anything that needs an AlgorithmIdentifier.
122 */
123 peddsactx->aid_len = 0;
124 ret = WPACKET_init_der(&pkt, peddsactx->aid_buf, sizeof(peddsactx->aid_buf));
125 switch (edkey->type) {
126 case ECX_KEY_TYPE_ED25519:
127 ret = ret && ossl_DER_w_algorithmIdentifier_ED25519(&pkt, -1, edkey);
128 break;
129 case ECX_KEY_TYPE_ED448:
130 ret = ret && ossl_DER_w_algorithmIdentifier_ED448(&pkt, -1, edkey);
131 break;
132 default:
133 /* Should never happen */
134 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
135 ossl_ecx_key_free(edkey);
136 return 0;
137 }
138 if (ret && WPACKET_finish(&pkt)) {
139 WPACKET_get_total_written(&pkt, &peddsactx->aid_len);
140 peddsactx->aid = WPACKET_get_curr(&pkt);
141 }
142 WPACKET_cleanup(&pkt);
143
144 peddsactx->key = edkey;
145
146 return 1;
147 }
148
ed25519_digest_sign(void * vpeddsactx,unsigned char * sigret,size_t * siglen,size_t sigsize,const unsigned char * tbs,size_t tbslen)149 int ed25519_digest_sign(void *vpeddsactx, unsigned char *sigret,
150 size_t *siglen, size_t sigsize,
151 const unsigned char *tbs, size_t tbslen)
152 {
153 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
154 const ECX_KEY *edkey = peddsactx->key;
155
156 if (!ossl_prov_is_running())
157 return 0;
158
159 if (sigret == NULL) {
160 *siglen = ED25519_SIGSIZE;
161 return 1;
162 }
163 if (sigsize < ED25519_SIGSIZE) {
164 ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
165 return 0;
166 }
167 #ifdef S390X_EC_ASM
168 if (S390X_CAN_SIGN(ED25519)) {
169 if (s390x_ed25519_digestsign(edkey, sigret, tbs, tbslen) == 0) {
170 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SIGN);
171 return 0;
172 }
173 *siglen = ED25519_SIGSIZE;
174 return 1;
175 }
176 #endif /* S390X_EC_ASM */
177 if (ossl_ed25519_sign(sigret, tbs, tbslen, edkey->pubkey, edkey->privkey,
178 peddsactx->libctx, NULL) == 0) {
179 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SIGN);
180 return 0;
181 }
182 *siglen = ED25519_SIGSIZE;
183 return 1;
184 }
185
ed448_digest_sign(void * vpeddsactx,unsigned char * sigret,size_t * siglen,size_t sigsize,const unsigned char * tbs,size_t tbslen)186 int ed448_digest_sign(void *vpeddsactx, unsigned char *sigret,
187 size_t *siglen, size_t sigsize,
188 const unsigned char *tbs, size_t tbslen)
189 {
190 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
191 const ECX_KEY *edkey = peddsactx->key;
192
193 if (!ossl_prov_is_running())
194 return 0;
195
196 if (sigret == NULL) {
197 *siglen = ED448_SIGSIZE;
198 return 1;
199 }
200 if (sigsize < ED448_SIGSIZE) {
201 ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
202 return 0;
203 }
204 #ifdef S390X_EC_ASM
205 if (S390X_CAN_SIGN(ED448)) {
206 if (s390x_ed448_digestsign(edkey, sigret, tbs, tbslen) == 0) {
207 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SIGN);
208 return 0;
209 }
210 *siglen = ED448_SIGSIZE;
211 return 1;
212 }
213 #endif /* S390X_EC_ASM */
214 if (ossl_ed448_sign(peddsactx->libctx, sigret, tbs, tbslen, edkey->pubkey,
215 edkey->privkey, NULL, 0, edkey->propq) == 0) {
216 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SIGN);
217 return 0;
218 }
219 *siglen = ED448_SIGSIZE;
220 return 1;
221 }
222
ed25519_digest_verify(void * vpeddsactx,const unsigned char * sig,size_t siglen,const unsigned char * tbs,size_t tbslen)223 int ed25519_digest_verify(void *vpeddsactx, const unsigned char *sig,
224 size_t siglen, const unsigned char *tbs,
225 size_t tbslen)
226 {
227 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
228 const ECX_KEY *edkey = peddsactx->key;
229
230 if (!ossl_prov_is_running() || siglen != ED25519_SIGSIZE)
231 return 0;
232
233 #ifdef S390X_EC_ASM
234 if (S390X_CAN_SIGN(ED25519))
235 return s390x_ed25519_digestverify(edkey, sig, tbs, tbslen);
236 #endif /* S390X_EC_ASM */
237
238 return ossl_ed25519_verify(tbs, tbslen, sig, edkey->pubkey,
239 peddsactx->libctx, edkey->propq);
240 }
241
ed448_digest_verify(void * vpeddsactx,const unsigned char * sig,size_t siglen,const unsigned char * tbs,size_t tbslen)242 int ed448_digest_verify(void *vpeddsactx, const unsigned char *sig,
243 size_t siglen, const unsigned char *tbs,
244 size_t tbslen)
245 {
246 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
247 const ECX_KEY *edkey = peddsactx->key;
248
249 if (!ossl_prov_is_running() || siglen != ED448_SIGSIZE)
250 return 0;
251
252 #ifdef S390X_EC_ASM
253 if (S390X_CAN_SIGN(ED448))
254 return s390x_ed448_digestverify(edkey, sig, tbs, tbslen);
255 #endif /* S390X_EC_ASM */
256
257 return ossl_ed448_verify(peddsactx->libctx, tbs, tbslen, sig, edkey->pubkey,
258 NULL, 0, edkey->propq);
259 }
260
eddsa_freectx(void * vpeddsactx)261 static void eddsa_freectx(void *vpeddsactx)
262 {
263 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
264
265 ossl_ecx_key_free(peddsactx->key);
266
267 OPENSSL_free(peddsactx);
268 }
269
eddsa_dupctx(void * vpeddsactx)270 static void *eddsa_dupctx(void *vpeddsactx)
271 {
272 PROV_EDDSA_CTX *srcctx = (PROV_EDDSA_CTX *)vpeddsactx;
273 PROV_EDDSA_CTX *dstctx;
274
275 if (!ossl_prov_is_running())
276 return NULL;
277
278 dstctx = OPENSSL_zalloc(sizeof(*srcctx));
279 if (dstctx == NULL)
280 return NULL;
281
282 *dstctx = *srcctx;
283 dstctx->key = NULL;
284
285 if (srcctx->key != NULL && !ossl_ecx_key_up_ref(srcctx->key)) {
286 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
287 goto err;
288 }
289 dstctx->key = srcctx->key;
290
291 return dstctx;
292 err:
293 eddsa_freectx(dstctx);
294 return NULL;
295 }
296
eddsa_get_ctx_params(void * vpeddsactx,OSSL_PARAM * params)297 static int eddsa_get_ctx_params(void *vpeddsactx, OSSL_PARAM *params)
298 {
299 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
300 OSSL_PARAM *p;
301
302 if (peddsactx == NULL)
303 return 0;
304
305 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
306 if (p != NULL && !OSSL_PARAM_set_octet_string(p, peddsactx->aid,
307 peddsactx->aid_len))
308 return 0;
309
310 return 1;
311 }
312
313 static const OSSL_PARAM known_gettable_ctx_params[] = {
314 OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
315 OSSL_PARAM_END
316 };
317
eddsa_gettable_ctx_params(ossl_unused void * vpeddsactx,ossl_unused void * provctx)318 static const OSSL_PARAM *eddsa_gettable_ctx_params(ossl_unused void *vpeddsactx,
319 ossl_unused void *provctx)
320 {
321 return known_gettable_ctx_params;
322 }
323
324 const OSSL_DISPATCH ossl_ed25519_signature_functions[] = {
325 { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))eddsa_newctx },
326 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
327 (void (*)(void))eddsa_digest_signverify_init },
328 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN,
329 (void (*)(void))ed25519_digest_sign },
330 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
331 (void (*)(void))eddsa_digest_signverify_init },
332 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY,
333 (void (*)(void))ed25519_digest_verify },
334 { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))eddsa_freectx },
335 { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))eddsa_dupctx },
336 { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))eddsa_get_ctx_params },
337 { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
338 (void (*)(void))eddsa_gettable_ctx_params },
339 { 0, NULL }
340 };
341
342 const OSSL_DISPATCH ossl_ed448_signature_functions[] = {
343 { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))eddsa_newctx },
344 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
345 (void (*)(void))eddsa_digest_signverify_init },
346 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN,
347 (void (*)(void))ed448_digest_sign },
348 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
349 (void (*)(void))eddsa_digest_signverify_init },
350 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY,
351 (void (*)(void))ed448_digest_verify },
352 { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))eddsa_freectx },
353 { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))eddsa_dupctx },
354 { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))eddsa_get_ctx_params },
355 { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
356 (void (*)(void))eddsa_gettable_ctx_params },
357 { 0, NULL }
358 };
359
360 #ifdef S390X_EC_ASM
361
s390x_ed25519_digestsign(const ECX_KEY * edkey,unsigned char * sig,const unsigned char * tbs,size_t tbslen)362 static int s390x_ed25519_digestsign(const ECX_KEY *edkey, unsigned char *sig,
363 const unsigned char *tbs, size_t tbslen)
364 {
365 int rc;
366 union {
367 struct {
368 unsigned char sig[64];
369 unsigned char priv[32];
370 } ed25519;
371 unsigned long long buff[512];
372 } param;
373
374 memset(¶m, 0, sizeof(param));
375 memcpy(param.ed25519.priv, edkey->privkey, sizeof(param.ed25519.priv));
376
377 rc = s390x_kdsa(S390X_EDDSA_SIGN_ED25519, ¶m.ed25519, tbs, tbslen);
378 OPENSSL_cleanse(param.ed25519.priv, sizeof(param.ed25519.priv));
379 if (rc != 0)
380 return 0;
381
382 s390x_flip_endian32(sig, param.ed25519.sig);
383 s390x_flip_endian32(sig + 32, param.ed25519.sig + 32);
384 return 1;
385 }
386
s390x_ed448_digestsign(const ECX_KEY * edkey,unsigned char * sig,const unsigned char * tbs,size_t tbslen)387 static int s390x_ed448_digestsign(const ECX_KEY *edkey, unsigned char *sig,
388 const unsigned char *tbs, size_t tbslen)
389 {
390 int rc;
391 union {
392 struct {
393 unsigned char sig[128];
394 unsigned char priv[64];
395 } ed448;
396 unsigned long long buff[512];
397 } param;
398
399 memset(¶m, 0, sizeof(param));
400 memcpy(param.ed448.priv + 64 - 57, edkey->privkey, 57);
401
402 rc = s390x_kdsa(S390X_EDDSA_SIGN_ED448, ¶m.ed448, tbs, tbslen);
403 OPENSSL_cleanse(param.ed448.priv, sizeof(param.ed448.priv));
404 if (rc != 0)
405 return 0;
406
407 s390x_flip_endian64(param.ed448.sig, param.ed448.sig);
408 s390x_flip_endian64(param.ed448.sig + 64, param.ed448.sig + 64);
409 memcpy(sig, param.ed448.sig, 57);
410 memcpy(sig + 57, param.ed448.sig + 64, 57);
411 return 1;
412 }
413
s390x_ed25519_digestverify(const ECX_KEY * edkey,const unsigned char * sig,const unsigned char * tbs,size_t tbslen)414 static int s390x_ed25519_digestverify(const ECX_KEY *edkey,
415 const unsigned char *sig,
416 const unsigned char *tbs, size_t tbslen)
417 {
418 union {
419 struct {
420 unsigned char sig[64];
421 unsigned char pub[32];
422 } ed25519;
423 unsigned long long buff[512];
424 } param;
425
426 memset(¶m, 0, sizeof(param));
427 s390x_flip_endian32(param.ed25519.sig, sig);
428 s390x_flip_endian32(param.ed25519.sig + 32, sig + 32);
429 s390x_flip_endian32(param.ed25519.pub, edkey->pubkey);
430
431 return s390x_kdsa(S390X_EDDSA_VERIFY_ED25519,
432 ¶m.ed25519, tbs, tbslen) == 0 ? 1 : 0;
433 }
434
s390x_ed448_digestverify(const ECX_KEY * edkey,const unsigned char * sig,const unsigned char * tbs,size_t tbslen)435 static int s390x_ed448_digestverify(const ECX_KEY *edkey,
436 const unsigned char *sig,
437 const unsigned char *tbs,
438 size_t tbslen)
439 {
440 union {
441 struct {
442 unsigned char sig[128];
443 unsigned char pub[64];
444 } ed448;
445 unsigned long long buff[512];
446 } param;
447
448 memset(¶m, 0, sizeof(param));
449 memcpy(param.ed448.sig, sig, 57);
450 s390x_flip_endian64(param.ed448.sig, param.ed448.sig);
451 memcpy(param.ed448.sig + 64, sig + 57, 57);
452 s390x_flip_endian64(param.ed448.sig + 64, param.ed448.sig + 64);
453 memcpy(param.ed448.pub, edkey->pubkey, 57);
454 s390x_flip_endian64(param.ed448.pub, param.ed448.pub);
455
456 return s390x_kdsa(S390X_EDDSA_VERIFY_ED448,
457 ¶m.ed448, tbs, tbslen) == 0 ? 1 : 0;
458 }
459
460 #endif /* S390X_EC_ASM */
461