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;
42 * What's passed as an actual key is defined by the KEYMGMT interface.
43 * We happen to know that our KEYMGMT simply passes RSA structures, so
44 * we use that here too.
51 /* OAEP message digest */
53 /* message digest for MGF1 */
56 unsigned char *oaep_label;
59 unsigned int client_version;
60 unsigned int alt_version;
63 static void *rsa_newctx(void *provctx)
65 PROV_RSA_CTX *prsactx = OPENSSL_zalloc(sizeof(PROV_RSA_CTX));
69 prsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
74 static int rsa_init(void *vprsactx, void *vrsa)
76 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
78 if (prsactx == NULL || vrsa == NULL || !RSA_up_ref(vrsa))
80 RSA_free(prsactx->rsa);
82 prsactx->pad_mode = RSA_PKCS1_PADDING;
86 static int rsa_encrypt(void *vprsactx, unsigned char *out, size_t *outlen,
87 size_t outsize, const unsigned char *in, size_t inlen)
89 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
93 size_t len = RSA_size(prsactx->rsa);
96 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
103 if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
104 int rsasize = RSA_size(prsactx->rsa);
107 if ((tbuf = OPENSSL_malloc(rsasize)) == NULL) {
108 PROVerr(0, ERR_R_MALLOC_FAILURE);
111 ret = RSA_padding_add_PKCS1_OAEP_mgf1(tbuf, rsasize, in, inlen,
113 prsactx->oaep_labellen,
121 ret = RSA_public_encrypt(rsasize, tbuf, out, prsactx->rsa,
125 ret = RSA_public_encrypt(inlen, in, out, prsactx->rsa,
128 /* A ret value of 0 is not an error */
135 static int rsa_decrypt(void *vprsactx, unsigned char *out, size_t *outlen,
136 size_t outsize, const unsigned char *in, size_t inlen)
138 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
140 size_t len = RSA_size(prsactx->rsa);
142 if (prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
144 *outlen = SSL_MAX_MASTER_KEY_LENGTH;
147 if (outsize < SSL_MAX_MASTER_KEY_LENGTH) {
148 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
154 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
162 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
167 if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING
168 || prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
171 if ((tbuf = OPENSSL_malloc(len)) == NULL) {
172 PROVerr(0, ERR_R_MALLOC_FAILURE);
175 ret = RSA_private_decrypt(inlen, in, tbuf, prsactx->rsa,
178 * With no padding then, on success ret should be len, otherwise an
179 * error occurred (non-constant time)
181 if (ret != (int)len) {
183 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_DECRYPT);
186 if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
187 ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, outsize, tbuf,
190 prsactx->oaep_labellen,
194 /* RSA_PKCS1_WITH_TLS_PADDING */
195 if (prsactx->client_version <= 0) {
196 ERR_raise(ERR_LIB_PROV, PROV_R_BAD_TLS_CLIENT_VERSION);
199 ret = rsa_padding_check_PKCS1_type_2_TLS(out, outsize,
201 prsactx->client_version,
202 prsactx->alt_version);
206 ret = RSA_private_decrypt(inlen, in, out, prsactx->rsa,
209 *outlen = constant_time_select_s(constant_time_msb_s(ret), *outlen, ret);
210 ret = constant_time_select_int(constant_time_msb(ret), 0, 1);
214 static void rsa_freectx(void *vprsactx)
216 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
218 RSA_free(prsactx->rsa);
220 EVP_MD_free(prsactx->oaep_md);
221 EVP_MD_free(prsactx->mgf1_md);
223 OPENSSL_free(prsactx);
226 static void *rsa_dupctx(void *vprsactx)
228 PROV_RSA_CTX *srcctx = (PROV_RSA_CTX *)vprsactx;
229 PROV_RSA_CTX *dstctx;
231 dstctx = OPENSSL_zalloc(sizeof(*srcctx));
236 if (dstctx->rsa != NULL && !RSA_up_ref(dstctx->rsa)) {
237 OPENSSL_free(dstctx);
241 if (dstctx->oaep_md != NULL && !EVP_MD_up_ref(dstctx->oaep_md)) {
242 RSA_free(dstctx->rsa);
243 OPENSSL_free(dstctx);
247 if (dstctx->mgf1_md != NULL && !EVP_MD_up_ref(dstctx->mgf1_md)) {
248 RSA_free(dstctx->rsa);
249 EVP_MD_free(dstctx->oaep_md);
250 OPENSSL_free(dstctx);
257 static int rsa_get_ctx_params(void *vprsactx, OSSL_PARAM *params)
259 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
262 if (prsactx == NULL || params == NULL)
265 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
266 if (p != NULL && !OSSL_PARAM_set_int(p, prsactx->pad_mode))
269 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
270 if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->oaep_md == NULL
272 : EVP_MD_name(prsactx->oaep_md)))
275 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
277 EVP_MD *mgf1_md = prsactx->mgf1_md == NULL ? prsactx->oaep_md
280 if (!OSSL_PARAM_set_utf8_string(p, mgf1_md == NULL
282 : EVP_MD_name(mgf1_md)))
286 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
287 if (p != NULL && !OSSL_PARAM_set_octet_ptr(p, prsactx->oaep_label, 0))
290 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN);
291 if (p != NULL && !OSSL_PARAM_set_size_t(p, prsactx->oaep_labellen))
294 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
295 if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->client_version))
298 p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
299 if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->alt_version))
305 static const OSSL_PARAM known_gettable_ctx_params[] = {
306 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
307 OSSL_PARAM_int(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL),
308 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
309 OSSL_PARAM_DEFN(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, OSSL_PARAM_OCTET_PTR,
311 OSSL_PARAM_size_t(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN, NULL),
312 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
313 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
317 static const OSSL_PARAM *rsa_gettable_ctx_params(void)
319 return known_gettable_ctx_params;
322 static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
324 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
326 char mdname[OSSL_MAX_NAME_SIZE];
327 char mdprops[OSSL_MAX_PROPQUERY_SIZE] = { '\0' };
331 if (prsactx == NULL || params == NULL)
334 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
336 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
340 p = OSSL_PARAM_locate_const(params,
341 OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS);
343 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
347 EVP_MD_free(prsactx->oaep_md);
348 prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, mdname, mdprops);
350 if (prsactx->oaep_md == NULL)
354 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
356 if (!OSSL_PARAM_get_int(p, &pad_mode))
359 * PSS padding is for signatures only so is not compatible with
360 * asymmetric cipher use.
362 if (pad_mode == RSA_PKCS1_PSS_PADDING)
364 if (pad_mode == RSA_PKCS1_OAEP_PADDING && prsactx->oaep_md == NULL) {
365 prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA1", mdprops);
366 if (prsactx->oaep_md == NULL)
369 prsactx->pad_mode = pad_mode;
372 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
374 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
378 p = OSSL_PARAM_locate_const(params,
379 OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS);
381 if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
387 EVP_MD_free(prsactx->mgf1_md);
388 prsactx->mgf1_md = EVP_MD_fetch(prsactx->libctx, mdname, str);
390 if (prsactx->mgf1_md == NULL)
394 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
396 void *tmp_label = NULL;
399 if (!OSSL_PARAM_get_octet_string(p, &tmp_label, 0, &tmp_labellen))
401 OPENSSL_free(prsactx->oaep_label);
402 prsactx->oaep_label = (unsigned char *)tmp_label;
403 prsactx->oaep_labellen = tmp_labellen;
406 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
408 unsigned int client_version;
410 if (!OSSL_PARAM_get_uint(p, &client_version))
412 prsactx->client_version = client_version;
415 p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
417 unsigned int alt_version;
419 if (!OSSL_PARAM_get_uint(p, &alt_version))
421 prsactx->alt_version = alt_version;
427 static const OSSL_PARAM known_settable_ctx_params[] = {
428 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
429 OSSL_PARAM_int(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL),
430 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
431 OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS, NULL, 0),
432 OSSL_PARAM_octet_string(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, NULL, 0),
433 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
434 OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
438 static const OSSL_PARAM *rsa_settable_ctx_params(void)
440 return known_settable_ctx_params;
443 const OSSL_DISPATCH rsa_asym_cipher_functions[] = {
444 { OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))rsa_newctx },
445 { OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))rsa_init },
446 { OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))rsa_encrypt },
447 { OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))rsa_init },
448 { OSSL_FUNC_ASYM_CIPHER_DECRYPT, (void (*)(void))rsa_decrypt },
449 { OSSL_FUNC_ASYM_CIPHER_FREECTX, (void (*)(void))rsa_freectx },
450 { OSSL_FUNC_ASYM_CIPHER_DUPCTX, (void (*)(void))rsa_dupctx },
451 { OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS,
452 (void (*)(void))rsa_get_ctx_params },
453 { OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS,
454 (void (*)(void))rsa_gettable_ctx_params },
455 { OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS,
456 (void (*)(void))rsa_set_ctx_params },
457 { OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS,
458 (void (*)(void))rsa_settable_ctx_params },