1 /*
2 * Copyright 2020-2021 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 return s390x_ed25519_digestsign(edkey, sigret, tbs, tbslen);
170 #endif /* S390X_EC_ASM */
171 if (ossl_ed25519_sign(sigret, tbs, tbslen, edkey->pubkey, edkey->privkey,
172 peddsactx->libctx, NULL) == 0) {
173 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SIGN);
174 return 0;
175 }
176 *siglen = ED25519_SIGSIZE;
177 return 1;
178 }
179
ed448_digest_sign(void * vpeddsactx,unsigned char * sigret,size_t * siglen,size_t sigsize,const unsigned char * tbs,size_t tbslen)180 int ed448_digest_sign(void *vpeddsactx, unsigned char *sigret,
181 size_t *siglen, size_t sigsize,
182 const unsigned char *tbs, size_t tbslen)
183 {
184 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
185 const ECX_KEY *edkey = peddsactx->key;
186
187 if (!ossl_prov_is_running())
188 return 0;
189
190 if (sigret == NULL) {
191 *siglen = ED448_SIGSIZE;
192 return 1;
193 }
194 if (sigsize < ED448_SIGSIZE) {
195 ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
196 return 0;
197 }
198 #ifdef S390X_EC_ASM
199 if (S390X_CAN_SIGN(ED448))
200 return s390x_ed448_digestsign(edkey, sigret, tbs, tbslen);
201 #endif /* S390X_EC_ASM */
202 if (ossl_ed448_sign(peddsactx->libctx, sigret, tbs, tbslen, edkey->pubkey,
203 edkey->privkey, NULL, 0, edkey->propq) == 0) {
204 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SIGN);
205 return 0;
206 }
207 *siglen = ED448_SIGSIZE;
208 return 1;
209 }
210
ed25519_digest_verify(void * vpeddsactx,const unsigned char * sig,size_t siglen,const unsigned char * tbs,size_t tbslen)211 int ed25519_digest_verify(void *vpeddsactx, const unsigned char *sig,
212 size_t siglen, const unsigned char *tbs,
213 size_t tbslen)
214 {
215 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
216 const ECX_KEY *edkey = peddsactx->key;
217
218 if (!ossl_prov_is_running() || siglen != ED25519_SIGSIZE)
219 return 0;
220
221 #ifdef S390X_EC_ASM
222 if (S390X_CAN_SIGN(ED25519))
223 return s390x_ed25519_digestverify(edkey, sig, tbs, tbslen);
224 #endif /* S390X_EC_ASM */
225
226 return ossl_ed25519_verify(tbs, tbslen, sig, edkey->pubkey,
227 peddsactx->libctx, edkey->propq);
228 }
229
ed448_digest_verify(void * vpeddsactx,const unsigned char * sig,size_t siglen,const unsigned char * tbs,size_t tbslen)230 int ed448_digest_verify(void *vpeddsactx, const unsigned char *sig,
231 size_t siglen, const unsigned char *tbs,
232 size_t tbslen)
233 {
234 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
235 const ECX_KEY *edkey = peddsactx->key;
236
237 if (!ossl_prov_is_running() || siglen != ED448_SIGSIZE)
238 return 0;
239
240 #ifdef S390X_EC_ASM
241 if (S390X_CAN_SIGN(ED448))
242 return s390x_ed448_digestverify(edkey, sig, tbs, tbslen);
243 #endif /* S390X_EC_ASM */
244
245 return ossl_ed448_verify(peddsactx->libctx, tbs, tbslen, sig, edkey->pubkey,
246 NULL, 0, edkey->propq);
247 }
248
eddsa_freectx(void * vpeddsactx)249 static void eddsa_freectx(void *vpeddsactx)
250 {
251 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
252
253 ossl_ecx_key_free(peddsactx->key);
254
255 OPENSSL_free(peddsactx);
256 }
257
eddsa_dupctx(void * vpeddsactx)258 static void *eddsa_dupctx(void *vpeddsactx)
259 {
260 PROV_EDDSA_CTX *srcctx = (PROV_EDDSA_CTX *)vpeddsactx;
261 PROV_EDDSA_CTX *dstctx;
262
263 if (!ossl_prov_is_running())
264 return NULL;
265
266 dstctx = OPENSSL_zalloc(sizeof(*srcctx));
267 if (dstctx == NULL)
268 return NULL;
269
270 *dstctx = *srcctx;
271 dstctx->key = NULL;
272
273 if (srcctx->key != NULL && !ossl_ecx_key_up_ref(srcctx->key)) {
274 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
275 goto err;
276 }
277 dstctx->key = srcctx->key;
278
279 return dstctx;
280 err:
281 eddsa_freectx(dstctx);
282 return NULL;
283 }
284
eddsa_get_ctx_params(void * vpeddsactx,OSSL_PARAM * params)285 static int eddsa_get_ctx_params(void *vpeddsactx, OSSL_PARAM *params)
286 {
287 PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
288 OSSL_PARAM *p;
289
290 if (peddsactx == NULL)
291 return 0;
292
293 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
294 if (p != NULL && !OSSL_PARAM_set_octet_string(p, peddsactx->aid,
295 peddsactx->aid_len))
296 return 0;
297
298 return 1;
299 }
300
301 static const OSSL_PARAM known_gettable_ctx_params[] = {
302 OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
303 OSSL_PARAM_END
304 };
305
eddsa_gettable_ctx_params(ossl_unused void * vpeddsactx,ossl_unused void * provctx)306 static const OSSL_PARAM *eddsa_gettable_ctx_params(ossl_unused void *vpeddsactx,
307 ossl_unused void *provctx)
308 {
309 return known_gettable_ctx_params;
310 }
311
312 const OSSL_DISPATCH ossl_ed25519_signature_functions[] = {
313 { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))eddsa_newctx },
314 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
315 (void (*)(void))eddsa_digest_signverify_init },
316 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN,
317 (void (*)(void))ed25519_digest_sign },
318 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
319 (void (*)(void))eddsa_digest_signverify_init },
320 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY,
321 (void (*)(void))ed25519_digest_verify },
322 { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))eddsa_freectx },
323 { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))eddsa_dupctx },
324 { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))eddsa_get_ctx_params },
325 { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
326 (void (*)(void))eddsa_gettable_ctx_params },
327 { 0, NULL }
328 };
329
330 const OSSL_DISPATCH ossl_ed448_signature_functions[] = {
331 { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))eddsa_newctx },
332 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
333 (void (*)(void))eddsa_digest_signverify_init },
334 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN,
335 (void (*)(void))ed448_digest_sign },
336 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
337 (void (*)(void))eddsa_digest_signverify_init },
338 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY,
339 (void (*)(void))ed448_digest_verify },
340 { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))eddsa_freectx },
341 { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))eddsa_dupctx },
342 { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))eddsa_get_ctx_params },
343 { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
344 (void (*)(void))eddsa_gettable_ctx_params },
345 { 0, NULL }
346 };
347
348 #ifdef S390X_EC_ASM
349
s390x_ed25519_digestsign(const ECX_KEY * edkey,unsigned char * sig,const unsigned char * tbs,size_t tbslen)350 static int s390x_ed25519_digestsign(const ECX_KEY *edkey, unsigned char *sig,
351 const unsigned char *tbs, size_t tbslen)
352 {
353 int rc;
354 union {
355 struct {
356 unsigned char sig[64];
357 unsigned char priv[32];
358 } ed25519;
359 unsigned long long buff[512];
360 } param;
361
362 memset(¶m, 0, sizeof(param));
363 memcpy(param.ed25519.priv, edkey->privkey, sizeof(param.ed25519.priv));
364
365 rc = s390x_kdsa(S390X_EDDSA_SIGN_ED25519, ¶m.ed25519, tbs, tbslen);
366 OPENSSL_cleanse(param.ed25519.priv, sizeof(param.ed25519.priv));
367 if (rc != 0)
368 return 0;
369
370 s390x_flip_endian32(sig, param.ed25519.sig);
371 s390x_flip_endian32(sig + 32, param.ed25519.sig + 32);
372 return 1;
373 }
374
s390x_ed448_digestsign(const ECX_KEY * edkey,unsigned char * sig,const unsigned char * tbs,size_t tbslen)375 static int s390x_ed448_digestsign(const ECX_KEY *edkey, unsigned char *sig,
376 const unsigned char *tbs, size_t tbslen)
377 {
378 int rc;
379 union {
380 struct {
381 unsigned char sig[128];
382 unsigned char priv[64];
383 } ed448;
384 unsigned long long buff[512];
385 } param;
386
387 memset(¶m, 0, sizeof(param));
388 memcpy(param.ed448.priv + 64 - 57, edkey->privkey, 57);
389
390 rc = s390x_kdsa(S390X_EDDSA_SIGN_ED448, ¶m.ed448, tbs, tbslen);
391 OPENSSL_cleanse(param.ed448.priv, sizeof(param.ed448.priv));
392 if (rc != 0)
393 return 0;
394
395 s390x_flip_endian64(param.ed448.sig, param.ed448.sig);
396 s390x_flip_endian64(param.ed448.sig + 64, param.ed448.sig + 64);
397 memcpy(sig, param.ed448.sig, 57);
398 memcpy(sig + 57, param.ed448.sig + 64, 57);
399 return 1;
400 }
401
s390x_ed25519_digestverify(const ECX_KEY * edkey,const unsigned char * sig,const unsigned char * tbs,size_t tbslen)402 static int s390x_ed25519_digestverify(const ECX_KEY *edkey,
403 const unsigned char *sig,
404 const unsigned char *tbs, size_t tbslen)
405 {
406 union {
407 struct {
408 unsigned char sig[64];
409 unsigned char pub[32];
410 } ed25519;
411 unsigned long long buff[512];
412 } param;
413
414 memset(¶m, 0, sizeof(param));
415 s390x_flip_endian32(param.ed25519.sig, sig);
416 s390x_flip_endian32(param.ed25519.sig + 32, sig + 32);
417 s390x_flip_endian32(param.ed25519.pub, edkey->pubkey);
418
419 return s390x_kdsa(S390X_EDDSA_VERIFY_ED25519,
420 ¶m.ed25519, tbs, tbslen) == 0 ? 1 : 0;
421 }
422
s390x_ed448_digestverify(const ECX_KEY * edkey,const unsigned char * sig,const unsigned char * tbs,size_t tbslen)423 static int s390x_ed448_digestverify(const ECX_KEY *edkey,
424 const unsigned char *sig,
425 const unsigned char *tbs,
426 size_t tbslen)
427 {
428 union {
429 struct {
430 unsigned char sig[128];
431 unsigned char pub[64];
432 } ed448;
433 unsigned long long buff[512];
434 } param;
435
436 memset(¶m, 0, sizeof(param));
437 memcpy(param.ed448.sig, sig, 57);
438 s390x_flip_endian64(param.ed448.sig, param.ed448.sig);
439 memcpy(param.ed448.sig + 64, sig + 57, 57);
440 s390x_flip_endian64(param.ed448.sig + 64, param.ed448.sig + 64);
441 memcpy(param.ed448.pub, edkey->pubkey, 57);
442 s390x_flip_endian64(param.ed448.pub, param.ed448.pub);
443
444 return s390x_kdsa(S390X_EDDSA_VERIFY_ED448,
445 ¶m.ed448, tbs, tbslen) == 0 ? 1 : 0;
446 }
447
448 #endif /* S390X_EC_ASM */
449