2 * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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 #include "internal/cryptlib.h"
12 #include <openssl/asn1t.h>
13 #include <openssl/x509.h>
14 #include <openssl/rsa.h>
15 #include <openssl/bn.h>
16 #include <openssl/evp.h>
17 #include <openssl/x509v3.h>
18 #include <openssl/cms.h>
19 #include "internal/evp_int.h"
22 /* RSA pkey context structure */
25 /* Key gen parameters */
28 /* Keygen callback info */
30 /* RSA padding mode */
34 /* message digest for MGF1 */
41 unsigned char *oaep_label;
45 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
48 rctx = OPENSSL_zalloc(sizeof(*rctx));
52 rctx->pad_mode = RSA_PKCS1_PADDING;
55 ctx->keygen_info = rctx->gentmp;
56 ctx->keygen_info_count = 2;
61 static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
63 RSA_PKEY_CTX *dctx, *sctx;
64 if (!pkey_rsa_init(dst))
68 dctx->nbits = sctx->nbits;
70 dctx->pub_exp = BN_dup(sctx->pub_exp);
74 dctx->pad_mode = sctx->pad_mode;
76 dctx->mgf1md = sctx->mgf1md;
77 if (sctx->oaep_label) {
78 OPENSSL_free(dctx->oaep_label);
79 dctx->oaep_label = OPENSSL_memdup(sctx->oaep_label, sctx->oaep_labellen);
80 if (!dctx->oaep_label)
82 dctx->oaep_labellen = sctx->oaep_labellen;
87 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
91 ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
92 if (ctx->tbuf == NULL)
97 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
99 RSA_PKEY_CTX *rctx = ctx->data;
101 BN_free(rctx->pub_exp);
102 OPENSSL_free(rctx->tbuf);
103 OPENSSL_free(rctx->oaep_label);
108 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
109 size_t *siglen, const unsigned char *tbs,
113 RSA_PKEY_CTX *rctx = ctx->data;
114 RSA *rsa = ctx->pkey->pkey.rsa;
117 if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
118 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_INVALID_DIGEST_LENGTH);
122 if (EVP_MD_type(rctx->md) == NID_mdc2) {
124 if (rctx->pad_mode != RSA_PKCS1_PADDING)
126 ret = RSA_sign_ASN1_OCTET_STRING(0,
127 tbs, tbslen, sig, &sltmp, rsa);
132 } else if (rctx->pad_mode == RSA_X931_PADDING) {
133 if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
134 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
137 if (!setup_tbuf(rctx, ctx)) {
138 RSAerr(RSA_F_PKEY_RSA_SIGN, ERR_R_MALLOC_FAILURE);
141 memcpy(rctx->tbuf, tbs, tbslen);
142 rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(rctx->md));
143 ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
144 sig, rsa, RSA_X931_PADDING);
145 } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
147 ret = RSA_sign(EVP_MD_type(rctx->md),
148 tbs, tbslen, sig, &sltmp, rsa);
152 } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
153 if (!setup_tbuf(rctx, ctx))
155 if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
157 rctx->md, rctx->mgf1md,
160 ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
161 sig, rsa, RSA_NO_PADDING);
165 ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
173 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
174 unsigned char *rout, size_t *routlen,
175 const unsigned char *sig, size_t siglen)
178 RSA_PKEY_CTX *rctx = ctx->data;
181 if (rctx->pad_mode == RSA_X931_PADDING) {
182 if (!setup_tbuf(rctx, ctx))
184 ret = RSA_public_decrypt(siglen, sig,
185 rctx->tbuf, ctx->pkey->pkey.rsa,
190 if (rctx->tbuf[ret] != RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
191 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
192 RSA_R_ALGORITHM_MISMATCH);
195 if (ret != EVP_MD_size(rctx->md)) {
196 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
197 RSA_R_INVALID_DIGEST_LENGTH);
201 memcpy(rout, rctx->tbuf, ret);
202 } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
204 ret = int_rsa_verify(EVP_MD_type(rctx->md),
205 NULL, 0, rout, &sltmp,
206 sig, siglen, ctx->pkey->pkey.rsa);
213 ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
221 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
222 const unsigned char *sig, size_t siglen,
223 const unsigned char *tbs, size_t tbslen)
225 RSA_PKEY_CTX *rctx = ctx->data;
226 RSA *rsa = ctx->pkey->pkey.rsa;
229 if (rctx->pad_mode == RSA_PKCS1_PADDING)
230 return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
232 if (rctx->pad_mode == RSA_X931_PADDING) {
233 if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
235 } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
237 if (!setup_tbuf(rctx, ctx))
239 ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
240 rsa, RSA_NO_PADDING);
243 ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
244 rctx->md, rctx->mgf1md,
245 rctx->tbuf, rctx->saltlen);
252 if (!setup_tbuf(rctx, ctx))
254 rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
255 rsa, rctx->pad_mode);
260 if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
267 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
268 unsigned char *out, size_t *outlen,
269 const unsigned char *in, size_t inlen)
272 RSA_PKEY_CTX *rctx = ctx->data;
273 if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
274 int klen = RSA_size(ctx->pkey->pkey.rsa);
275 if (!setup_tbuf(rctx, ctx))
277 if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
281 rctx->md, rctx->mgf1md))
283 ret = RSA_public_encrypt(klen, rctx->tbuf, out,
284 ctx->pkey->pkey.rsa, RSA_NO_PADDING);
286 ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
294 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
295 unsigned char *out, size_t *outlen,
296 const unsigned char *in, size_t inlen)
299 RSA_PKEY_CTX *rctx = ctx->data;
300 if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
302 if (!setup_tbuf(rctx, ctx))
304 ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
305 ctx->pkey->pkey.rsa, RSA_NO_PADDING);
308 for (i = 0; i < ret; i++) {
312 ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf + i,
316 rctx->md, rctx->mgf1md);
318 ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
326 static int check_padding_md(const EVP_MD *md, int padding)
332 mdnid = EVP_MD_type(md);
334 if (padding == RSA_NO_PADDING) {
335 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
339 if (padding == RSA_X931_PADDING) {
340 if (RSA_X931_hash_id(mdnid) == -1) {
341 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_X931_DIGEST);
346 /* List of all supported RSA digests */
361 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_DIGEST);
370 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
372 RSA_PKEY_CTX *rctx = ctx->data;
374 case EVP_PKEY_CTRL_RSA_PADDING:
375 if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
376 if (!check_padding_md(rctx->md, p1))
378 if (p1 == RSA_PKCS1_PSS_PADDING) {
379 if (!(ctx->operation &
380 (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
383 rctx->md = EVP_sha1();
385 if (p1 == RSA_PKCS1_OAEP_PADDING) {
386 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
389 rctx->md = EVP_sha1();
395 RSAerr(RSA_F_PKEY_RSA_CTRL,
396 RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
399 case EVP_PKEY_CTRL_GET_RSA_PADDING:
400 *(int *)p2 = rctx->pad_mode;
403 case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
404 case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
405 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
406 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
409 if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN)
410 *(int *)p2 = rctx->saltlen;
418 case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
420 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL);
426 case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
429 BN_free(rctx->pub_exp);
433 case EVP_PKEY_CTRL_RSA_OAEP_MD:
434 case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
435 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
436 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
439 if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
440 *(const EVP_MD **)p2 = rctx->md;
445 case EVP_PKEY_CTRL_MD:
446 if (!check_padding_md(p2, rctx->pad_mode))
451 case EVP_PKEY_CTRL_GET_MD:
452 *(const EVP_MD **)p2 = rctx->md;
455 case EVP_PKEY_CTRL_RSA_MGF1_MD:
456 case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
457 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
458 && rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
459 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
462 if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
464 *(const EVP_MD **)p2 = rctx->mgf1md;
466 *(const EVP_MD **)p2 = rctx->md;
471 case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
472 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
473 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
476 OPENSSL_free(rctx->oaep_label);
478 rctx->oaep_label = p2;
479 rctx->oaep_labellen = p1;
481 rctx->oaep_label = NULL;
482 rctx->oaep_labellen = 0;
486 case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
487 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
488 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
491 *(unsigned char **)p2 = rctx->oaep_label;
492 return rctx->oaep_labellen;
494 case EVP_PKEY_CTRL_DIGESTINIT:
495 case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
496 case EVP_PKEY_CTRL_PKCS7_DECRYPT:
497 case EVP_PKEY_CTRL_PKCS7_SIGN:
499 #ifndef OPENSSL_NO_CMS
500 case EVP_PKEY_CTRL_CMS_DECRYPT:
501 case EVP_PKEY_CTRL_CMS_ENCRYPT:
502 case EVP_PKEY_CTRL_CMS_SIGN:
505 case EVP_PKEY_CTRL_PEER_KEY:
506 RSAerr(RSA_F_PKEY_RSA_CTRL,
507 RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
516 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
517 const char *type, const char *value)
520 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
523 if (strcmp(type, "rsa_padding_mode") == 0) {
525 if (strcmp(value, "pkcs1") == 0)
526 pm = RSA_PKCS1_PADDING;
527 else if (strcmp(value, "sslv23") == 0)
528 pm = RSA_SSLV23_PADDING;
529 else if (strcmp(value, "none") == 0)
531 else if (strcmp(value, "oeap") == 0)
532 pm = RSA_PKCS1_OAEP_PADDING;
533 else if (strcmp(value, "oaep") == 0)
534 pm = RSA_PKCS1_OAEP_PADDING;
535 else if (strcmp(value, "x931") == 0)
536 pm = RSA_X931_PADDING;
537 else if (strcmp(value, "pss") == 0)
538 pm = RSA_PKCS1_PSS_PADDING;
540 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
543 return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
546 if (strcmp(type, "rsa_pss_saltlen") == 0) {
548 saltlen = atoi(value);
549 return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
552 if (strcmp(type, "rsa_keygen_bits") == 0) {
555 return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
558 if (strcmp(type, "rsa_keygen_pubexp") == 0) {
560 BIGNUM *pubexp = NULL;
561 if (!BN_asc2bn(&pubexp, value))
563 ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
569 if (strcmp(type, "rsa_mgf1_md") == 0) {
571 if ((md = EVP_get_digestbyname(value)) == NULL) {
572 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
575 return EVP_PKEY_CTX_set_rsa_mgf1_md(ctx, md);
578 if (strcmp(type, "rsa_oaep_md") == 0) {
580 if ((md = EVP_get_digestbyname(value)) == NULL) {
581 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
584 return EVP_PKEY_CTX_set_rsa_oaep_md(ctx, md);
586 if (strcmp(type, "rsa_oaep_label") == 0) {
590 lab = OPENSSL_hexstr2buf(value, &lablen);
593 ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
602 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
605 RSA_PKEY_CTX *rctx = ctx->data;
608 if (rctx->pub_exp == NULL) {
609 rctx->pub_exp = BN_new();
610 if (rctx->pub_exp == NULL || !BN_set_word(rctx->pub_exp, RSA_F4))
616 if (ctx->pkey_gencb) {
617 pcb = BN_GENCB_new();
622 evp_pkey_set_cb_translate(pcb, ctx);
625 ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
628 EVP_PKEY_assign_RSA(pkey, rsa);
634 const EVP_PKEY_METHOD rsa_pkey_meth = {
636 EVP_PKEY_FLAG_AUTOARGLEN,
653 pkey_rsa_verifyrecover,