2 * Copyright 2019-2020 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 * RSA low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
16 #include <openssl/crypto.h>
17 #include <openssl/evp.h>
18 #include <openssl/core_numbers.h>
19 #include <openssl/core_names.h>
20 #include <openssl/rsa.h>
21 #include <openssl/params.h>
22 #include <openssl/err.h>
23 /* Just for SSL_MAX_MASTER_KEY_LENGTH */
24 #include <openssl/ssl.h>
25 #include "internal/constant_time.h"
26 #include "internal/sizes.h"
27 #include "crypto/rsa.h"
28 #include "prov/providercommonerr.h"
29 #include "prov/provider_ctx.h"
30 #include "prov/implementations.h"
34 static OSSL_OP_asym_cipher_newctx_fn rsa_newctx;
35 static OSSL_OP_asym_cipher_encrypt_init_fn rsa_init;
36 static OSSL_OP_asym_cipher_encrypt_fn rsa_encrypt;
37 static OSSL_OP_asym_cipher_decrypt_init_fn rsa_init;
38 static OSSL_OP_asym_cipher_decrypt_fn rsa_decrypt;
39 static OSSL_OP_asym_cipher_freectx_fn rsa_freectx;
40 static OSSL_OP_asym_cipher_dupctx_fn rsa_dupctx;
41 static OSSL_OP_asym_cipher_get_ctx_params_fn rsa_get_ctx_params;
42 static OSSL_OP_asym_cipher_gettable_ctx_params_fn rsa_gettable_ctx_params;
43 static OSSL_OP_asym_cipher_set_ctx_params_fn rsa_set_ctx_params;
44 static OSSL_OP_asym_cipher_settable_ctx_params_fn rsa_settable_ctx_params;
46 static OSSL_ITEM padding_item[] = {
47 { RSA_PKCS1_PADDING, OSSL_PKEY_RSA_PAD_MODE_PKCSV15 },
48 { RSA_SSLV23_PADDING, OSSL_PKEY_RSA_PAD_MODE_SSLV23 },
49 { RSA_NO_PADDING, OSSL_PKEY_RSA_PAD_MODE_NONE },
50 { RSA_PKCS1_OAEP_PADDING, OSSL_PKEY_RSA_PAD_MODE_OAEP }, /* Correct spelling first */
51 { RSA_PKCS1_OAEP_PADDING, "oeap" },
52 { RSA_X931_PADDING, OSSL_PKEY_RSA_PAD_MODE_X931 },
57 * What's passed as an actual key is defined by the KEYMGMT interface.
58 * We happen to know that our KEYMGMT simply passes RSA structures, so
59 * we use that here too.
66 /* OAEP message digest */
68 /* message digest for MGF1 */
71 unsigned char *oaep_label;
74 unsigned int client_version;
75 unsigned int alt_version;
78 static void *rsa_newctx(void *provctx)
80 PROV_RSA_CTX *prsactx = OPENSSL_zalloc(sizeof(PROV_RSA_CTX));
84 prsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
89 static int rsa_init(void *vprsactx, void *vrsa)
91 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
93 if (prsactx == NULL || vrsa == NULL || !RSA_up_ref(vrsa))
95 RSA_free(prsactx->rsa);
98 switch (RSA_test_flags(prsactx->rsa, RSA_FLAG_TYPE_MASK)) {
99 case RSA_FLAG_TYPE_RSA:
100 prsactx->pad_mode = RSA_PKCS1_PADDING;
103 ERR_raise(ERR_LIB_PROV, PROV_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
110 static int rsa_encrypt(void *vprsactx, unsigned char *out, size_t *outlen,
111 size_t outsize, const unsigned char *in, size_t inlen)
113 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
117 size_t len = RSA_size(prsactx->rsa);
120 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
127 if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
128 int rsasize = RSA_size(prsactx->rsa);
131 if ((tbuf = OPENSSL_malloc(rsasize)) == NULL) {
132 PROVerr(0, ERR_R_MALLOC_FAILURE);
135 if (prsactx->oaep_md == NULL) {
137 prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
138 PROVerr(0, ERR_R_INTERNAL_ERROR);
141 ret = RSA_padding_add_PKCS1_OAEP_mgf1(tbuf, rsasize, in, inlen,
143 prsactx->oaep_labellen,
151 ret = RSA_public_encrypt(rsasize, tbuf, out, prsactx->rsa,
155 ret = RSA_public_encrypt(inlen, in, out, prsactx->rsa,
158 /* A ret value of 0 is not an error */
165 static int rsa_decrypt(void *vprsactx, unsigned char *out, size_t *outlen,
166 size_t outsize, const unsigned char *in, size_t inlen)
168 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
170 size_t len = RSA_size(prsactx->rsa);
172 if (prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
174 *outlen = SSL_MAX_MASTER_KEY_LENGTH;
177 if (outsize < SSL_MAX_MASTER_KEY_LENGTH) {
178 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
184 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
192 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
197 if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING
198 || prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
201 if ((tbuf = OPENSSL_malloc(len)) == NULL) {
202 PROVerr(0, ERR_R_MALLOC_FAILURE);
205 ret = RSA_private_decrypt(inlen, in, tbuf, prsactx->rsa,
208 * With no padding then, on success ret should be len, otherwise an
209 * error occurred (non-constant time)
211 if (ret != (int)len) {
213 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_DECRYPT);
216 if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
217 if (prsactx->oaep_md == NULL) {
218 prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
219 if (prsactx->oaep_md == NULL) {
220 PROVerr(0, ERR_R_INTERNAL_ERROR);
224 ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, outsize, tbuf,
227 prsactx->oaep_labellen,
231 /* RSA_PKCS1_WITH_TLS_PADDING */
232 if (prsactx->client_version <= 0) {
233 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_TLS_CLIENT_VERSION);
236 ret = rsa_padding_check_PKCS1_type_2_TLS(prsactx->libctx, out,
239 prsactx->client_version,
240 prsactx->alt_version);
244 ret = RSA_private_decrypt(inlen, in, out, prsactx->rsa,
247 *outlen = constant_time_select_s(constant_time_msb_s(ret), *outlen, ret);
248 ret = constant_time_select_int(constant_time_msb(ret), 0, 1);
252 static void rsa_freectx(void *vprsactx)
254 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
256 RSA_free(prsactx->rsa);
258 EVP_MD_free(prsactx->oaep_md);
259 EVP_MD_free(prsactx->mgf1_md);
260 OPENSSL_free(prsactx->oaep_label);
262 OPENSSL_free(prsactx);
265 static void *rsa_dupctx(void *vprsactx)
267 PROV_RSA_CTX *srcctx = (PROV_RSA_CTX *)vprsactx;
268 PROV_RSA_CTX *dstctx;
270 dstctx = OPENSSL_zalloc(sizeof(*srcctx));
275 if (dstctx->rsa != NULL && !RSA_up_ref(dstctx->rsa)) {
276 OPENSSL_free(dstctx);
280 if (dstctx->oaep_md != NULL && !EVP_MD_up_ref(dstctx->oaep_md)) {
281 RSA_free(dstctx->rsa);
282 OPENSSL_free(dstctx);
286 if (dstctx->mgf1_md != NULL && !EVP_MD_up_ref(dstctx->mgf1_md)) {
287 RSA_free(dstctx->rsa);
288 EVP_MD_free(dstctx->oaep_md);
289 OPENSSL_free(dstctx);
296 static int rsa_get_ctx_params(void *vprsactx, OSSL_PARAM *params)
298 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
301 if (prsactx == NULL || params == NULL)
304 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
306 switch (p->data_type) {
307 case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
308 if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
311 case OSSL_PARAM_UTF8_STRING:
314 const char *word = NULL;
316 for (i = 0; padding_item[i].id != 0; i++) {
317 if (prsactx->pad_mode == (int)padding_item[i].id) {
318 word = padding_item[i].ptr;
324 if (!OSSL_PARAM_set_utf8_string(p, word))
327 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
335 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
336 if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->oaep_md == NULL
338 : EVP_MD_name(prsactx->oaep_md)))
341 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
343 EVP_MD *mgf1_md = prsactx->mgf1_md == NULL ? prsactx->oaep_md
346 if (!OSSL_PARAM_set_utf8_string(p, mgf1_md == NULL
348 : EVP_MD_name(mgf1_md)))
352 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
353 if (p != NULL && !OSSL_PARAM_set_octet_ptr(p, prsactx->oaep_label, 0))
356 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN);
357 if (p != NULL && !OSSL_PARAM_set_size_t(p, prsactx->oaep_labellen))
360 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
361 if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->client_version))
364 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
365 if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->alt_version))
371 static const OSSL_PARAM known_gettable_ctx_params[] = {
372 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
373 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
374 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
375 OSSL_PARAM_DEFN(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, OSSL_PARAM_OCTET_PTR,
377 OSSL_PARAM_size_t(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN, NULL),
378 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
379 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
383 static const OSSL_PARAM *rsa_gettable_ctx_params(void)
385 return known_gettable_ctx_params;
388 static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
390 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
392 char mdname[OSSL_MAX_NAME_SIZE];
393 char mdprops[OSSL_MAX_PROPQUERY_SIZE] = { '\0' };
396 if (prsactx == NULL || params == NULL)
399 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
401 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
405 p = OSSL_PARAM_locate_const(params,
406 OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS);
408 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
412 EVP_MD_free(prsactx->oaep_md);
413 prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, mdname, mdprops);
415 if (prsactx->oaep_md == NULL)
419 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
423 switch (p->data_type) {
424 case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
425 if (!OSSL_PARAM_get_int(p, &pad_mode))
428 case OSSL_PARAM_UTF8_STRING:
435 for (i = 0; padding_item[i].id != 0; i++) {
436 if (strcmp(p->data, padding_item[i].ptr) == 0) {
437 pad_mode = padding_item[i].id;
448 * PSS padding is for signatures only so is not compatible with
449 * asymmetric cipher use.
451 if (pad_mode == RSA_PKCS1_PSS_PADDING)
453 if (pad_mode == RSA_PKCS1_OAEP_PADDING && prsactx->oaep_md == NULL) {
454 prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA1", mdprops);
455 if (prsactx->oaep_md == NULL)
458 prsactx->pad_mode = pad_mode;
461 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
463 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
467 p = OSSL_PARAM_locate_const(params,
468 OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS);
470 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
476 EVP_MD_free(prsactx->mgf1_md);
477 prsactx->mgf1_md = EVP_MD_fetch(prsactx->libctx, mdname, str);
479 if (prsactx->mgf1_md == NULL)
483 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
485 void *tmp_label = NULL;
488 if (!OSSL_PARAM_get_octet_string(p, &tmp_label, 0, &tmp_labellen))
490 OPENSSL_free(prsactx->oaep_label);
491 prsactx->oaep_label = (unsigned char *)tmp_label;
492 prsactx->oaep_labellen = tmp_labellen;
495 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
497 unsigned int client_version;
499 if (!OSSL_PARAM_get_uint(p, &client_version))
501 prsactx->client_version = client_version;
504 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
506 unsigned int alt_version;
508 if (!OSSL_PARAM_get_uint(p, &alt_version))
510 prsactx->alt_version = alt_version;
516 static const OSSL_PARAM known_settable_ctx_params[] = {
517 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
518 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
519 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
520 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS, NULL, 0),
521 OSSL_PARAM_octet_string(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, NULL, 0),
522 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
523 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
527 static const OSSL_PARAM *rsa_settable_ctx_params(void)
529 return known_settable_ctx_params;
532 const OSSL_DISPATCH rsa_asym_cipher_functions[] = {
533 { OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))rsa_newctx },
534 { OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))rsa_init },
535 { OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))rsa_encrypt },
536 { OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))rsa_init },
537 { OSSL_FUNC_ASYM_CIPHER_DECRYPT, (void (*)(void))rsa_decrypt },
538 { OSSL_FUNC_ASYM_CIPHER_FREECTX, (void (*)(void))rsa_freectx },
539 { OSSL_FUNC_ASYM_CIPHER_DUPCTX, (void (*)(void))rsa_dupctx },
540 { OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS,
541 (void (*)(void))rsa_get_ctx_params },
542 { OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS,
543 (void (*)(void))rsa_gettable_ctx_params },
544 { OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS,
545 (void (*)(void))rsa_set_ctx_params },
546 { OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS,
547 (void (*)(void))rsa_settable_ctx_params },