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 if (edkey->privkey == NULL) {
168 ERR_raise(ERR_LIB_PROV, PROV_R_NOT_A_PRIVATE_KEY);
169 return 0;
170 }
171 #ifdef S390X_EC_ASM
172 if (S390X_CAN_SIGN(ED25519)) {
173 if (s390x_ed25519_digestsign(edkey, sigret, tbs, tbslen) == 0) {
174 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SIGN);
175 return 0;
176 }
177 *siglen = ED25519_SIGSIZE;
178 return 1;
179 }
180 #endif /* S390X_EC_ASM */
181 if (ossl_ed25519_sign(sigret, tbs, tbslen, edkey->pubkey, edkey->privkey,
182 peddsactx->libctx, NULL) == 0) {
183 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SIGN);
184 return 0;
185 }
186 *siglen = ED25519_SIGSIZE;
187 return 1;
188 }
189
ed448_digest_sign(void * vpeddsactx,unsigned char * sigret,size_t * siglen,size_t sigsize,const unsigned char * tbs,size_t tbslen)190 int ed448_digest_sign(void *vpeddsactx, unsigned char *sigret,
191 size_t *siglen, size_t sigsize,
192 const unsigned char *tbs, size_t tbslen)
193 {
194 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
195 const ECX_KEY *edkey = peddsactx->key;
196
197 if (!ossl_prov_is_running())
198 return 0;
199
200 if (sigret == NULL) {
201 *siglen = ED448_SIGSIZE;
202 return 1;
203 }
204 if (sigsize < ED448_SIGSIZE) {
205 ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
206 return 0;
207 }
208 if (edkey->privkey == NULL) {
209 ERR_raise(ERR_LIB_PROV, PROV_R_NOT_A_PRIVATE_KEY);
210 return 0;
211 }
212 #ifdef S390X_EC_ASM
213 if (S390X_CAN_SIGN(ED448)) {
214 if (s390x_ed448_digestsign(edkey, sigret, tbs, tbslen) == 0) {
215 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SIGN);
216 return 0;
217 }
218 *siglen = ED448_SIGSIZE;
219 return 1;
220 }
221 #endif /* S390X_EC_ASM */
222 if (ossl_ed448_sign(peddsactx->libctx, sigret, tbs, tbslen, edkey->pubkey,
223 edkey->privkey, NULL, 0, edkey->propq) == 0) {
224 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SIGN);
225 return 0;
226 }
227 *siglen = ED448_SIGSIZE;
228 return 1;
229 }
230
ed25519_digest_verify(void * vpeddsactx,const unsigned char * sig,size_t siglen,const unsigned char * tbs,size_t tbslen)231 int ed25519_digest_verify(void *vpeddsactx, const unsigned char *sig,
232 size_t siglen, const unsigned char *tbs,
233 size_t tbslen)
234 {
235 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
236 const ECX_KEY *edkey = peddsactx->key;
237
238 if (!ossl_prov_is_running() || siglen != ED25519_SIGSIZE)
239 return 0;
240
241 #ifdef S390X_EC_ASM
242 if (S390X_CAN_SIGN(ED25519))
243 return s390x_ed25519_digestverify(edkey, sig, tbs, tbslen);
244 #endif /* S390X_EC_ASM */
245
246 return ossl_ed25519_verify(tbs, tbslen, sig, edkey->pubkey,
247 peddsactx->libctx, edkey->propq);
248 }
249
ed448_digest_verify(void * vpeddsactx,const unsigned char * sig,size_t siglen,const unsigned char * tbs,size_t tbslen)250 int ed448_digest_verify(void *vpeddsactx, const unsigned char *sig,
251 size_t siglen, const unsigned char *tbs,
252 size_t tbslen)
253 {
254 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
255 const ECX_KEY *edkey = peddsactx->key;
256
257 if (!ossl_prov_is_running() || siglen != ED448_SIGSIZE)
258 return 0;
259
260 #ifdef S390X_EC_ASM
261 if (S390X_CAN_SIGN(ED448))
262 return s390x_ed448_digestverify(edkey, sig, tbs, tbslen);
263 #endif /* S390X_EC_ASM */
264
265 return ossl_ed448_verify(peddsactx->libctx, tbs, tbslen, sig, edkey->pubkey,
266 NULL, 0, edkey->propq);
267 }
268
eddsa_freectx(void * vpeddsactx)269 static void eddsa_freectx(void *vpeddsactx)
270 {
271 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
272
273 ossl_ecx_key_free(peddsactx->key);
274
275 OPENSSL_free(peddsactx);
276 }
277
eddsa_dupctx(void * vpeddsactx)278 static void *eddsa_dupctx(void *vpeddsactx)
279 {
280 PROV_EDDSA_CTX *srcctx = (PROV_EDDSA_CTX *)vpeddsactx;
281 PROV_EDDSA_CTX *dstctx;
282
283 if (!ossl_prov_is_running())
284 return NULL;
285
286 dstctx = OPENSSL_zalloc(sizeof(*srcctx));
287 if (dstctx == NULL)
288 return NULL;
289
290 *dstctx = *srcctx;
291 dstctx->key = NULL;
292
293 if (srcctx->key != NULL && !ossl_ecx_key_up_ref(srcctx->key)) {
294 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
295 goto err;
296 }
297 dstctx->key = srcctx->key;
298
299 return dstctx;
300 err:
301 eddsa_freectx(dstctx);
302 return NULL;
303 }
304
eddsa_get_ctx_params(void * vpeddsactx,OSSL_PARAM * params)305 static int eddsa_get_ctx_params(void *vpeddsactx, OSSL_PARAM *params)
306 {
307 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
308 OSSL_PARAM *p;
309
310 if (peddsactx == NULL)
311 return 0;
312
313 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
314 if (p != NULL && !OSSL_PARAM_set_octet_string(p, peddsactx->aid,
315 peddsactx->aid_len))
316 return 0;
317
318 return 1;
319 }
320
321 static const OSSL_PARAM known_gettable_ctx_params[] = {
322 OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
323 OSSL_PARAM_END
324 };
325
eddsa_gettable_ctx_params(ossl_unused void * vpeddsactx,ossl_unused void * provctx)326 static const OSSL_PARAM *eddsa_gettable_ctx_params(ossl_unused void *vpeddsactx,
327 ossl_unused void *provctx)
328 {
329 return known_gettable_ctx_params;
330 }
331
332 const OSSL_DISPATCH ossl_ed25519_signature_functions[] = {
333 { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))eddsa_newctx },
334 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
335 (void (*)(void))eddsa_digest_signverify_init },
336 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN,
337 (void (*)(void))ed25519_digest_sign },
338 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
339 (void (*)(void))eddsa_digest_signverify_init },
340 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY,
341 (void (*)(void))ed25519_digest_verify },
342 { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))eddsa_freectx },
343 { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))eddsa_dupctx },
344 { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))eddsa_get_ctx_params },
345 { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
346 (void (*)(void))eddsa_gettable_ctx_params },
347 { 0, NULL }
348 };
349
350 const OSSL_DISPATCH ossl_ed448_signature_functions[] = {
351 { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))eddsa_newctx },
352 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
353 (void (*)(void))eddsa_digest_signverify_init },
354 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN,
355 (void (*)(void))ed448_digest_sign },
356 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
357 (void (*)(void))eddsa_digest_signverify_init },
358 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY,
359 (void (*)(void))ed448_digest_verify },
360 { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))eddsa_freectx },
361 { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))eddsa_dupctx },
362 { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))eddsa_get_ctx_params },
363 { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
364 (void (*)(void))eddsa_gettable_ctx_params },
365 { 0, NULL }
366 };
367
368 #ifdef S390X_EC_ASM
369
s390x_ed25519_digestsign(const ECX_KEY * edkey,unsigned char * sig,const unsigned char * tbs,size_t tbslen)370 static int s390x_ed25519_digestsign(const ECX_KEY *edkey, unsigned char *sig,
371 const unsigned char *tbs, size_t tbslen)
372 {
373 int rc;
374 union {
375 struct {
376 unsigned char sig[64];
377 unsigned char priv[32];
378 } ed25519;
379 unsigned long long buff[512];
380 } param;
381
382 memset(¶m, 0, sizeof(param));
383 memcpy(param.ed25519.priv, edkey->privkey, sizeof(param.ed25519.priv));
384
385 rc = s390x_kdsa(S390X_EDDSA_SIGN_ED25519, ¶m.ed25519, tbs, tbslen);
386 OPENSSL_cleanse(param.ed25519.priv, sizeof(param.ed25519.priv));
387 if (rc != 0)
388 return 0;
389
390 s390x_flip_endian32(sig, param.ed25519.sig);
391 s390x_flip_endian32(sig + 32, param.ed25519.sig + 32);
392 return 1;
393 }
394
s390x_ed448_digestsign(const ECX_KEY * edkey,unsigned char * sig,const unsigned char * tbs,size_t tbslen)395 static int s390x_ed448_digestsign(const ECX_KEY *edkey, unsigned char *sig,
396 const unsigned char *tbs, size_t tbslen)
397 {
398 int rc;
399 union {
400 struct {
401 unsigned char sig[128];
402 unsigned char priv[64];
403 } ed448;
404 unsigned long long buff[512];
405 } param;
406
407 memset(¶m, 0, sizeof(param));
408 memcpy(param.ed448.priv + 64 - 57, edkey->privkey, 57);
409
410 rc = s390x_kdsa(S390X_EDDSA_SIGN_ED448, ¶m.ed448, tbs, tbslen);
411 OPENSSL_cleanse(param.ed448.priv, sizeof(param.ed448.priv));
412 if (rc != 0)
413 return 0;
414
415 s390x_flip_endian64(param.ed448.sig, param.ed448.sig);
416 s390x_flip_endian64(param.ed448.sig + 64, param.ed448.sig + 64);
417 memcpy(sig, param.ed448.sig, 57);
418 memcpy(sig + 57, param.ed448.sig + 64, 57);
419 return 1;
420 }
421
s390x_ed25519_digestverify(const ECX_KEY * edkey,const unsigned char * sig,const unsigned char * tbs,size_t tbslen)422 static int s390x_ed25519_digestverify(const ECX_KEY *edkey,
423 const unsigned char *sig,
424 const unsigned char *tbs, size_t tbslen)
425 {
426 union {
427 struct {
428 unsigned char sig[64];
429 unsigned char pub[32];
430 } ed25519;
431 unsigned long long buff[512];
432 } param;
433
434 memset(¶m, 0, sizeof(param));
435 s390x_flip_endian32(param.ed25519.sig, sig);
436 s390x_flip_endian32(param.ed25519.sig + 32, sig + 32);
437 s390x_flip_endian32(param.ed25519.pub, edkey->pubkey);
438
439 return s390x_kdsa(S390X_EDDSA_VERIFY_ED25519,
440 ¶m.ed25519, tbs, tbslen) == 0 ? 1 : 0;
441 }
442
s390x_ed448_digestverify(const ECX_KEY * edkey,const unsigned char * sig,const unsigned char * tbs,size_t tbslen)443 static int s390x_ed448_digestverify(const ECX_KEY *edkey,
444 const unsigned char *sig,
445 const unsigned char *tbs,
446 size_t tbslen)
447 {
448 union {
449 struct {
450 unsigned char sig[128];
451 unsigned char pub[64];
452 } ed448;
453 unsigned long long buff[512];
454 } param;
455
456 memset(¶m, 0, sizeof(param));
457 memcpy(param.ed448.sig, sig, 57);
458 s390x_flip_endian64(param.ed448.sig, param.ed448.sig);
459 memcpy(param.ed448.sig + 64, sig + 57, 57);
460 s390x_flip_endian64(param.ed448.sig + 64, param.ed448.sig + 64);
461 memcpy(param.ed448.pub, edkey->pubkey, 57);
462 s390x_flip_endian64(param.ed448.pub, param.ed448.pub);
463
464 return s390x_kdsa(S390X_EDDSA_VERIFY_ED448,
465 ¶m.ed448, tbs, tbslen) == 0 ? 1 : 0;
466 }
467
468 #endif /* S390X_EC_ASM */
469