2 * Copyright 2006-2020 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 * DH low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
17 #include <openssl/x509.h>
18 #include <openssl/asn1.h>
19 #include <openssl/bn.h>
20 #include <openssl/core_names.h>
21 #include <openssl/param_build.h>
22 #include <openssl/cms.h>
23 #include "internal/ffc.h"
24 #include "internal/cryptlib.h"
25 #include "crypto/asn1.h"
26 #include "crypto/dh.h"
27 #include "crypto/evp.h"
31 * i2d/d2i like DH parameter functions which use the appropriate routine for
32 * PKCS#3 DH or X9.42 DH.
35 static DH *d2i_dhp(const EVP_PKEY *pkey, const unsigned char **pp,
39 int is_dhx = (pkey->ameth == &dhx_asn1_meth);
42 dh = d2i_DHxparams(NULL, pp, length);
44 dh = d2i_DHparams(NULL, pp, length);
47 DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
48 DH_set_flags(dh, is_dhx ? DH_FLAG_TYPE_DHX : DH_FLAG_TYPE_DH);
53 static int i2d_dhp(const EVP_PKEY *pkey, const DH *a, unsigned char **pp)
55 if (pkey->ameth == &dhx_asn1_meth)
56 return i2d_DHxparams(a, pp);
57 return i2d_DHparams(a, pp);
60 static void int_dh_free(EVP_PKEY *pkey)
62 DH_free(pkey->pkey.dh);
65 static int dh_pub_decode(EVP_PKEY *pkey, const X509_PUBKEY *pubkey)
67 const unsigned char *p, *pm;
71 const ASN1_STRING *pstr;
73 ASN1_INTEGER *public_key = NULL;
77 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
79 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
81 if (ptype != V_ASN1_SEQUENCE) {
82 DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR);
90 if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL) {
91 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
95 if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) {
96 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
100 /* We have parameters now set public key */
101 if ((dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
102 DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR);
106 ASN1_INTEGER_free(public_key);
107 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
111 ASN1_INTEGER_free(public_key);
116 static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
120 unsigned char *penc = NULL;
123 ASN1_INTEGER *pub_key = NULL;
127 str = ASN1_STRING_new();
129 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
132 str->length = i2d_dhp(pkey, dh, &str->data);
133 if (str->length <= 0) {
134 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
137 ptype = V_ASN1_SEQUENCE;
139 pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
143 penclen = i2d_ASN1_INTEGER(pub_key, &penc);
145 ASN1_INTEGER_free(pub_key);
148 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
152 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
153 ptype, str, penc, penclen))
158 ASN1_STRING_free(str);
164 * PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in that
165 * the AlgorithmIdentifier contains the parameters, the private key is
166 * explicitly included and the pubkey must be recalculated.
169 static int dh_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
171 const unsigned char *p, *pm;
175 const ASN1_STRING *pstr;
176 const X509_ALGOR *palg;
177 ASN1_INTEGER *privkey = NULL;
180 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
183 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
185 if (ptype != V_ASN1_SEQUENCE)
187 if ((privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL)
192 pmlen = pstr->length;
193 if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL)
196 /* We have parameters now set private key */
197 if ((dh->priv_key = BN_secure_new()) == NULL
198 || !ASN1_INTEGER_to_BN(privkey, dh->priv_key)) {
199 DHerr(DH_F_DH_PRIV_DECODE, DH_R_BN_ERROR);
202 /* Calculate public key, increments dirty_cnt */
203 if (!DH_generate_key(dh))
206 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
208 ASN1_STRING_clear_free(privkey);
213 DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR);
216 ASN1_STRING_clear_free(privkey);
220 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
222 ASN1_STRING *params = NULL;
223 ASN1_INTEGER *prkey = NULL;
224 unsigned char *dp = NULL;
227 params = ASN1_STRING_new();
229 if (params == NULL) {
230 DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
234 params->length = i2d_dhp(pkey, pkey->pkey.dh, ¶ms->data);
235 if (params->length <= 0) {
236 DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
239 params->type = V_ASN1_SEQUENCE;
241 /* Get private key into integer */
242 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);
245 DHerr(DH_F_DH_PRIV_ENCODE, DH_R_BN_ERROR);
249 dplen = i2d_ASN1_INTEGER(prkey, &dp);
251 ASN1_STRING_clear_free(prkey);
254 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
255 V_ASN1_SEQUENCE, params, dp, dplen))
262 ASN1_STRING_free(params);
263 ASN1_STRING_clear_free(prkey);
267 static int dh_param_decode(EVP_PKEY *pkey,
268 const unsigned char **pder, int derlen)
272 if ((dh = d2i_dhp(pkey, pder, derlen)) == NULL)
275 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
279 static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
281 return i2d_dhp(pkey, pkey->pkey.dh, pder);
284 static int do_dh_print(BIO *bp, const DH *x, int indent, int ptype)
286 int reason = ERR_R_BUF_LIB;
287 const char *ktype = NULL;
288 BIGNUM *priv_key, *pub_key;
291 priv_key = x->priv_key;
296 pub_key = x->pub_key;
300 if (x->params.p == NULL || (ptype == 2 && priv_key == NULL)
301 || (ptype > 0 && pub_key == NULL)) {
302 reason = ERR_R_PASSED_NULL_PARAMETER;
307 ktype = "DH Private-Key";
309 ktype = "DH Public-Key";
311 ktype = "DH Parameters";
313 if (!BIO_indent(bp, indent, 128)
314 || BIO_printf(bp, "%s: (%d bit)\n", ktype, DH_bits(x)) <= 0)
318 if (!ASN1_bn_print(bp, "private-key:", priv_key, NULL, indent))
320 if (!ASN1_bn_print(bp, "public-key:", pub_key, NULL, indent))
323 if (!ossl_ffc_params_print(bp, &x->params, indent))
326 if (x->length != 0) {
327 if (!BIO_indent(bp, indent, 128)
328 || BIO_printf(bp, "recommended-private-length: %d bits\n",
329 (int)x->length) <= 0)
336 DHerr(DH_F_DO_DH_PRINT, reason);
340 static int int_dh_size(const EVP_PKEY *pkey)
342 return DH_size(pkey->pkey.dh);
345 static int dh_bits(const EVP_PKEY *pkey)
347 return DH_bits(pkey->pkey.dh);
350 static int dh_security_bits(const EVP_PKEY *pkey)
352 return DH_security_bits(pkey->pkey.dh);
355 static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
357 return ossl_ffc_params_cmp(&a->pkey.dh->params, &a->pkey.dh->params,
358 a->ameth != &dhx_asn1_meth);
361 static int int_dh_param_copy(DH *to, const DH *from, int is_x942)
364 is_x942 = (from->params.q != NULL);
365 if (!ossl_ffc_params_copy(&to->params, &from->params))
368 to->length = from->length;
373 DH *DHparams_dup(const DH *dh)
379 if (!int_dh_param_copy(ret, dh, -1)) {
386 static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
388 if (to->pkey.dh == NULL) {
389 to->pkey.dh = DH_new();
390 if (to->pkey.dh == NULL)
393 return int_dh_param_copy(to->pkey.dh, from->pkey.dh,
394 from->ameth == &dhx_asn1_meth);
397 static int dh_missing_parameters(const EVP_PKEY *a)
399 return a->pkey.dh == NULL
400 || a->pkey.dh->params.p == NULL
401 || a->pkey.dh->params.g == NULL;
404 static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
406 if (dh_cmp_parameters(a, b) == 0)
408 if (BN_cmp(b->pkey.dh->pub_key, a->pkey.dh->pub_key) != 0)
414 static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
417 return do_dh_print(bp, pkey->pkey.dh, indent, 0);
420 static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent,
423 return do_dh_print(bp, pkey->pkey.dh, indent, 1);
426 static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent,
429 return do_dh_print(bp, pkey->pkey.dh, indent, 2);
432 int DHparams_print(BIO *bp, const DH *x)
434 return do_dh_print(bp, x, 4, 0);
437 static int dh_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
440 case ASN1_PKEY_CTRL_SET1_TLS_ENCPT:
441 return dh_buf2key(EVP_PKEY_get0_DH(pkey), arg2, arg1);
442 case ASN1_PKEY_CTRL_GET1_TLS_ENCPT:
443 return dh_key2buf(EVP_PKEY_get0_DH(pkey), arg2, 0, 1);
449 static int dhx_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
452 #ifndef OPENSSL_NO_CMS
453 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
454 *(int *)arg2 = CMS_RECIPINFO_AGREE;
463 static int dh_pkey_public_check(const EVP_PKEY *pkey)
465 DH *dh = pkey->pkey.dh;
467 if (dh->pub_key == NULL) {
468 DHerr(DH_F_DH_PKEY_PUBLIC_CHECK, DH_R_MISSING_PUBKEY);
472 return DH_check_pub_key_ex(dh, dh->pub_key);
475 static int dh_pkey_param_check(const EVP_PKEY *pkey)
477 DH *dh = pkey->pkey.dh;
479 return DH_check_ex(dh);
482 static size_t dh_pkey_dirty_cnt(const EVP_PKEY *pkey)
484 return pkey->pkey.dh->dirty_cnt;
487 static int dh_pkey_export_to(const EVP_PKEY *from, void *to_keydata,
488 EVP_KEYMGMT *to_keymgmt, OPENSSL_CTX *libctx,
491 DH *dh = from->pkey.dh;
492 OSSL_PARAM_BLD *tmpl;
493 const BIGNUM *p = DH_get0_p(dh), *g = DH_get0_g(dh), *q = DH_get0_q(dh);
494 const BIGNUM *pub_key = DH_get0_pub_key(dh);
495 const BIGNUM *priv_key = DH_get0_priv_key(dh);
496 OSSL_PARAM *params = NULL;
501 * If the DH method is foreign, then we can't be sure of anything, and
502 * can therefore not export or pretend to export.
504 if (dh_get_method(dh) != DH_OpenSSL())
507 if (p == NULL || g == NULL)
510 tmpl = OSSL_PARAM_BLD_new();
513 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, p)
514 || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, g))
517 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q, q))
520 selection |= OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS;
521 if (pub_key != NULL) {
522 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PUB_KEY, pub_key))
524 selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
526 if (priv_key != NULL) {
527 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PRIV_KEY,
530 selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY;
533 if ((params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL)
536 /* We export, the provider imports */
537 rv = evp_keymgmt_import(to_keymgmt, to_keydata, selection, params);
539 OSSL_PARAM_BLD_free_params(params);
541 OSSL_PARAM_BLD_free(tmpl);
545 static int dh_pkey_import_from_type(const OSSL_PARAM params[], void *vpctx,
548 EVP_PKEY_CTX *pctx = vpctx;
549 EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx);
550 DH *dh = dh_new_ex(pctx->libctx);
553 ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
556 DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
557 DH_set_flags(dh, type == EVP_PKEY_DH ? DH_FLAG_TYPE_DH : DH_FLAG_TYPE_DHX);
559 if (!dh_ffc_params_fromdata(dh, params)
560 || !dh_key_fromdata(dh, params)
561 || !EVP_PKEY_assign(pkey, type, dh)) {
568 static int dh_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
570 return dh_pkey_import_from_type(params, vpctx, EVP_PKEY_DH);
573 static int dhx_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
575 return dh_pkey_import_from_type(params, vpctx, EVP_PKEY_DHX);
578 const EVP_PKEY_ASN1_METHOD dh_asn1_meth = {
584 "OpenSSL PKCS#3 DH method",
601 dh_missing_parameters,
613 dh_pkey_public_check,
623 const EVP_PKEY_ASN1_METHOD dhx_asn1_meth = {
629 "OpenSSL X9.42 DH method",
646 dh_missing_parameters,
658 dh_pkey_public_check,
663 dhx_pkey_import_from,