2 * Copyright 2019 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
10 #include <openssl/crypto.h>
11 #include <openssl/evp.h>
12 #include <openssl/core_numbers.h>
13 #include <openssl/core_names.h>
14 #include <openssl/rsa.h>
15 #include <openssl/params.h>
16 #include <openssl/err.h>
17 /* Just for SSL_MAX_MASTER_KEY_LENGTH */
18 #include <openssl/ssl.h>
19 #include "internal/constant_time.h"
20 #include "internal/sizes.h"
21 #include "crypto/rsa.h"
22 #include "prov/providercommonerr.h"
23 #include "prov/provider_ctx.h"
24 #include "prov/implementations.h"
28 static OSSL_OP_asym_cipher_newctx_fn rsa_newctx;
29 static OSSL_OP_asym_cipher_encrypt_init_fn rsa_init;
30 static OSSL_OP_asym_cipher_encrypt_fn rsa_encrypt;
31 static OSSL_OP_asym_cipher_decrypt_init_fn rsa_init;
32 static OSSL_OP_asym_cipher_decrypt_fn rsa_decrypt;
33 static OSSL_OP_asym_cipher_freectx_fn rsa_freectx;
34 static OSSL_OP_asym_cipher_dupctx_fn rsa_dupctx;
35 static OSSL_OP_asym_cipher_get_ctx_params_fn rsa_get_ctx_params;
36 static OSSL_OP_asym_cipher_gettable_ctx_params_fn rsa_gettable_ctx_params;
37 static OSSL_OP_asym_cipher_set_ctx_params_fn rsa_set_ctx_params;
38 static OSSL_OP_asym_cipher_settable_ctx_params_fn rsa_settable_ctx_params;
40 static OSSL_ITEM padding_item[] = {
41 { RSA_PKCS1_PADDING, "pkcs1" },
42 { RSA_SSLV23_PADDING, "sslv23" },
43 { RSA_NO_PADDING, "none" },
44 { RSA_PKCS1_OAEP_PADDING, "oaep" }, /* Correct spelling first */
45 { RSA_PKCS1_OAEP_PADDING, "oeap" },
46 { RSA_X931_PADDING, "x931" },
47 { RSA_PKCS1_PSS_PADDING, "pss" },
52 * What's passed as an actual key is defined by the KEYMGMT interface.
53 * We happen to know that our KEYMGMT simply passes RSA structures, so
54 * we use that here too.
61 /* OAEP message digest */
63 /* message digest for MGF1 */
66 unsigned char *oaep_label;
69 unsigned int client_version;
70 unsigned int alt_version;
73 static void *rsa_newctx(void *provctx)
75 PROV_RSA_CTX *prsactx = OPENSSL_zalloc(sizeof(PROV_RSA_CTX));
79 prsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
84 static int rsa_init(void *vprsactx, void *vrsa)
86 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
88 if (prsactx == NULL || vrsa == NULL || !RSA_up_ref(vrsa))
90 RSA_free(prsactx->rsa);
92 prsactx->pad_mode = RSA_PKCS1_PADDING;
96 static int rsa_encrypt(void *vprsactx, unsigned char *out, size_t *outlen,
97 size_t outsize, const unsigned char *in, size_t inlen)
99 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
103 size_t len = RSA_size(prsactx->rsa);
106 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
113 if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
114 int rsasize = RSA_size(prsactx->rsa);
117 if ((tbuf = OPENSSL_malloc(rsasize)) == NULL) {
118 PROVerr(0, ERR_R_MALLOC_FAILURE);
121 ret = RSA_padding_add_PKCS1_OAEP_mgf1(tbuf, rsasize, in, inlen,
123 prsactx->oaep_labellen,
131 ret = RSA_public_encrypt(rsasize, tbuf, out, prsactx->rsa,
135 ret = RSA_public_encrypt(inlen, in, out, prsactx->rsa,
138 /* A ret value of 0 is not an error */
145 static int rsa_decrypt(void *vprsactx, unsigned char *out, size_t *outlen,
146 size_t outsize, const unsigned char *in, size_t inlen)
148 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
150 size_t len = RSA_size(prsactx->rsa);
152 if (prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
154 *outlen = SSL_MAX_MASTER_KEY_LENGTH;
157 if (outsize < SSL_MAX_MASTER_KEY_LENGTH) {
158 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
164 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
172 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
177 if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING
178 || prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
181 if ((tbuf = OPENSSL_malloc(len)) == NULL) {
182 PROVerr(0, ERR_R_MALLOC_FAILURE);
185 ret = RSA_private_decrypt(inlen, in, tbuf, prsactx->rsa,
188 * With no padding then, on success ret should be len, otherwise an
189 * error occurred (non-constant time)
191 if (ret != (int)len) {
193 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_DECRYPT);
196 if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
197 ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, outsize, tbuf,
200 prsactx->oaep_labellen,
204 /* RSA_PKCS1_WITH_TLS_PADDING */
205 if (prsactx->client_version <= 0) {
206 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_TLS_CLIENT_VERSION);
209 ret = rsa_padding_check_PKCS1_type_2_TLS(out, outsize,
211 prsactx->client_version,
212 prsactx->alt_version);
216 ret = RSA_private_decrypt(inlen, in, out, prsactx->rsa,
219 *outlen = constant_time_select_s(constant_time_msb_s(ret), *outlen, ret);
220 ret = constant_time_select_int(constant_time_msb(ret), 0, 1);
224 static void rsa_freectx(void *vprsactx)
226 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
228 RSA_free(prsactx->rsa);
230 EVP_MD_free(prsactx->oaep_md);
231 EVP_MD_free(prsactx->mgf1_md);
233 OPENSSL_free(prsactx);
236 static void *rsa_dupctx(void *vprsactx)
238 PROV_RSA_CTX *srcctx = (PROV_RSA_CTX *)vprsactx;
239 PROV_RSA_CTX *dstctx;
241 dstctx = OPENSSL_zalloc(sizeof(*srcctx));
246 if (dstctx->rsa != NULL && !RSA_up_ref(dstctx->rsa)) {
247 OPENSSL_free(dstctx);
251 if (dstctx->oaep_md != NULL && !EVP_MD_up_ref(dstctx->oaep_md)) {
252 RSA_free(dstctx->rsa);
253 OPENSSL_free(dstctx);
257 if (dstctx->mgf1_md != NULL && !EVP_MD_up_ref(dstctx->mgf1_md)) {
258 RSA_free(dstctx->rsa);
259 EVP_MD_free(dstctx->oaep_md);
260 OPENSSL_free(dstctx);
267 static int rsa_get_ctx_params(void *vprsactx, OSSL_PARAM *params)
269 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
272 if (prsactx == NULL || params == NULL)
275 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
277 switch (p->data_type) {
278 case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
279 if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
282 case OSSL_PARAM_UTF8_STRING:
285 const char *word = NULL;
287 for (i = 0; padding_item[i].id != 0; i++) {
288 if (prsactx->pad_mode == (int)padding_item[i].id) {
289 word = padding_item[i].ptr;
295 if (!OSSL_PARAM_set_utf8_string(p, word))
298 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
306 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
307 if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->oaep_md == NULL
309 : EVP_MD_name(prsactx->oaep_md)))
312 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
314 EVP_MD *mgf1_md = prsactx->mgf1_md == NULL ? prsactx->oaep_md
317 if (!OSSL_PARAM_set_utf8_string(p, mgf1_md == NULL
319 : EVP_MD_name(mgf1_md)))
323 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
324 if (p != NULL && !OSSL_PARAM_set_octet_ptr(p, prsactx->oaep_label, 0))
327 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN);
328 if (p != NULL && !OSSL_PARAM_set_size_t(p, prsactx->oaep_labellen))
331 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
332 if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->client_version))
335 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
336 if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->alt_version))
342 static const OSSL_PARAM known_gettable_ctx_params[] = {
343 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
344 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
345 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
346 OSSL_PARAM_DEFN(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, OSSL_PARAM_OCTET_PTR,
348 OSSL_PARAM_size_t(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN, NULL),
349 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
350 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
354 static const OSSL_PARAM *rsa_gettable_ctx_params(void)
356 return known_gettable_ctx_params;
359 static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
361 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
363 char mdname[OSSL_MAX_NAME_SIZE];
364 char mdprops[OSSL_MAX_PROPQUERY_SIZE] = { '\0' };
367 if (prsactx == NULL || params == NULL)
370 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
372 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
376 p = OSSL_PARAM_locate_const(params,
377 OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS);
379 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
383 EVP_MD_free(prsactx->oaep_md);
384 prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, mdname, mdprops);
386 if (prsactx->oaep_md == NULL)
390 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
394 switch (p->data_type) {
395 case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
396 if (!OSSL_PARAM_get_int(p, &pad_mode))
399 case OSSL_PARAM_UTF8_STRING:
406 for (i = 0; padding_item[i].id != 0; i++) {
407 if (strcmp(p->data, padding_item[i].ptr) == 0) {
408 pad_mode = padding_item[i].id;
419 * PSS padding is for signatures only so is not compatible with
420 * asymmetric cipher use.
422 if (pad_mode == RSA_PKCS1_PSS_PADDING)
424 if (pad_mode == RSA_PKCS1_OAEP_PADDING && prsactx->oaep_md == NULL) {
425 prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA1", mdprops);
426 if (prsactx->oaep_md == NULL)
429 prsactx->pad_mode = pad_mode;
432 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
434 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
438 p = OSSL_PARAM_locate_const(params,
439 OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS);
441 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
447 EVP_MD_free(prsactx->mgf1_md);
448 prsactx->mgf1_md = EVP_MD_fetch(prsactx->libctx, mdname, str);
450 if (prsactx->mgf1_md == NULL)
454 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
456 void *tmp_label = NULL;
459 if (!OSSL_PARAM_get_octet_string(p, &tmp_label, 0, &tmp_labellen))
461 OPENSSL_free(prsactx->oaep_label);
462 prsactx->oaep_label = (unsigned char *)tmp_label;
463 prsactx->oaep_labellen = tmp_labellen;
466 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
468 unsigned int client_version;
470 if (!OSSL_PARAM_get_uint(p, &client_version))
472 prsactx->client_version = client_version;
475 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
477 unsigned int alt_version;
479 if (!OSSL_PARAM_get_uint(p, &alt_version))
481 prsactx->alt_version = alt_version;
487 static const OSSL_PARAM known_settable_ctx_params[] = {
488 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
489 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
490 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
491 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS, NULL, 0),
492 OSSL_PARAM_octet_string(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, NULL, 0),
493 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
494 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
498 static const OSSL_PARAM *rsa_settable_ctx_params(void)
500 return known_settable_ctx_params;
503 const OSSL_DISPATCH rsa_asym_cipher_functions[] = {
504 { OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))rsa_newctx },
505 { OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))rsa_init },
506 { OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))rsa_encrypt },
507 { OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))rsa_init },
508 { OSSL_FUNC_ASYM_CIPHER_DECRYPT, (void (*)(void))rsa_decrypt },
509 { OSSL_FUNC_ASYM_CIPHER_FREECTX, (void (*)(void))rsa_freectx },
510 { OSSL_FUNC_ASYM_CIPHER_DUPCTX, (void (*)(void))rsa_dupctx },
511 { OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS,
512 (void (*)(void))rsa_get_ctx_params },
513 { OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS,
514 (void (*)(void))rsa_gettable_ctx_params },
515 { OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS,
516 (void (*)(void))rsa_set_ctx_params },
517 { OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS,
518 (void (*)(void))rsa_settable_ctx_params },