2 * Copyright 2006-2018 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 #include "internal/cryptlib.h"
12 #include <openssl/asn1t.h>
13 #include <openssl/x509.h>
14 #include <openssl/evp.h>
16 #include <openssl/bn.h>
17 #include <openssl/dsa.h>
18 #include <openssl/objects.h>
19 #include "internal/evp_int.h"
21 /* DH pkey context structure */
24 /* Parameter gen parameters */
30 /* message digest used for parameter generation */
34 /* Keygen callback info */
36 /* KDF (if any) to use for DH */
38 /* OID to use for KDF */
40 /* Message digest to use for key derivation */
42 /* User key material */
43 unsigned char *kdf_ukm;
45 /* KDF output length */
49 static int pkey_dh_init(EVP_PKEY_CTX *ctx)
53 if ((dctx = OPENSSL_zalloc(sizeof(*dctx))) == NULL) {
54 DHerr(DH_F_PKEY_DH_INIT, ERR_R_MALLOC_FAILURE);
57 dctx->prime_len = 1024;
58 dctx->subprime_len = -1;
60 dctx->kdf_type = EVP_PKEY_DH_KDF_NONE;
63 ctx->keygen_info = dctx->gentmp;
64 ctx->keygen_info_count = 2;
69 static void pkey_dh_cleanup(EVP_PKEY_CTX *ctx)
71 DH_PKEY_CTX *dctx = ctx->data;
73 OPENSSL_free(dctx->kdf_ukm);
74 ASN1_OBJECT_free(dctx->kdf_oid);
80 static int pkey_dh_copy(EVP_PKEY_CTX *dst, const EVP_PKEY_CTX *src)
82 DH_PKEY_CTX *dctx, *sctx;
83 if (!pkey_dh_init(dst))
87 dctx->prime_len = sctx->prime_len;
88 dctx->subprime_len = sctx->subprime_len;
89 dctx->generator = sctx->generator;
90 dctx->use_dsa = sctx->use_dsa;
91 dctx->pad = sctx->pad;
93 dctx->rfc5114_param = sctx->rfc5114_param;
94 dctx->param_nid = sctx->param_nid;
96 dctx->kdf_type = sctx->kdf_type;
97 dctx->kdf_oid = OBJ_dup(sctx->kdf_oid);
98 if (dctx->kdf_oid == NULL)
100 dctx->kdf_md = sctx->kdf_md;
101 if (sctx->kdf_ukm != NULL) {
102 dctx->kdf_ukm = OPENSSL_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
103 if (dctx->kdf_ukm == NULL)
105 dctx->kdf_ukmlen = sctx->kdf_ukmlen;
107 dctx->kdf_outlen = sctx->kdf_outlen;
111 static int pkey_dh_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
113 DH_PKEY_CTX *dctx = ctx->data;
115 case EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN:
118 dctx->prime_len = p1;
121 case EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN:
122 if (dctx->use_dsa == 0)
124 dctx->subprime_len = p1;
127 case EVP_PKEY_CTRL_DH_PAD:
131 case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR:
134 dctx->generator = p1;
137 case EVP_PKEY_CTRL_DH_PARAMGEN_TYPE:
138 #ifdef OPENSSL_NO_DSA
142 if (p1 < 0 || p1 > 2)
148 case EVP_PKEY_CTRL_DH_RFC5114:
149 if (p1 < 1 || p1 > 3 || dctx->param_nid != NID_undef)
151 dctx->rfc5114_param = p1;
154 case EVP_PKEY_CTRL_DH_NID:
155 if (p1 <= 0 || dctx->rfc5114_param != 0)
157 dctx->param_nid = p1;
160 case EVP_PKEY_CTRL_PEER_KEY:
161 /* Default behaviour is OK */
164 case EVP_PKEY_CTRL_DH_KDF_TYPE:
166 return dctx->kdf_type;
167 #ifdef OPENSSL_NO_CMS
168 if (p1 != EVP_PKEY_DH_KDF_NONE)
170 if (p1 != EVP_PKEY_DH_KDF_NONE && p1 != EVP_PKEY_DH_KDF_X9_42)
176 case EVP_PKEY_CTRL_DH_KDF_MD:
180 case EVP_PKEY_CTRL_GET_DH_KDF_MD:
181 *(const EVP_MD **)p2 = dctx->kdf_md;
184 case EVP_PKEY_CTRL_DH_KDF_OUTLEN:
187 dctx->kdf_outlen = (size_t)p1;
190 case EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN:
191 *(int *)p2 = dctx->kdf_outlen;
194 case EVP_PKEY_CTRL_DH_KDF_UKM:
195 OPENSSL_free(dctx->kdf_ukm);
198 dctx->kdf_ukmlen = p1;
200 dctx->kdf_ukmlen = 0;
203 case EVP_PKEY_CTRL_GET_DH_KDF_UKM:
204 *(unsigned char **)p2 = dctx->kdf_ukm;
205 return dctx->kdf_ukmlen;
207 case EVP_PKEY_CTRL_DH_KDF_OID:
208 ASN1_OBJECT_free(dctx->kdf_oid);
212 case EVP_PKEY_CTRL_GET_DH_KDF_OID:
213 *(ASN1_OBJECT **)p2 = dctx->kdf_oid;
222 static int pkey_dh_ctrl_str(EVP_PKEY_CTX *ctx,
223 const char *type, const char *value)
225 if (strcmp(type, "dh_paramgen_prime_len") == 0) {
228 return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len);
230 if (strcmp(type, "dh_rfc5114") == 0) {
231 DH_PKEY_CTX *dctx = ctx->data;
234 if (len < 0 || len > 3)
236 dctx->rfc5114_param = len;
239 if (strcmp(type, "dh_param") == 0) {
240 DH_PKEY_CTX *dctx = ctx->data;
241 int nid = OBJ_sn2nid(value);
243 if (nid == NID_undef) {
244 DHerr(DH_F_PKEY_DH_CTRL_STR, DH_R_INVALID_PARAMETER_NAME);
247 dctx->param_nid = nid;
250 if (strcmp(type, "dh_paramgen_generator") == 0) {
253 return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len);
255 if (strcmp(type, "dh_paramgen_subprime_len") == 0) {
258 return EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len);
260 if (strcmp(type, "dh_paramgen_type") == 0) {
263 return EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ);
265 if (strcmp(type, "dh_pad") == 0) {
268 return EVP_PKEY_CTX_set_dh_pad(ctx, pad);
273 #ifndef OPENSSL_NO_DSA
275 extern int dsa_builtin_paramgen(DSA *ret, size_t bits, size_t qbits,
277 const unsigned char *seed_in, size_t seed_len,
278 unsigned char *seed_out, int *counter_ret,
279 unsigned long *h_ret, BN_GENCB *cb);
281 extern int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
283 const unsigned char *seed_in,
284 size_t seed_len, int idx,
285 unsigned char *seed_out, int *counter_ret,
286 unsigned long *h_ret, BN_GENCB *cb);
288 static DSA *dsa_dh_generate(DH_PKEY_CTX *dctx, BN_GENCB *pcb)
292 int prime_len = dctx->prime_len;
293 int subprime_len = dctx->subprime_len;
294 const EVP_MD *md = dctx->md;
295 if (dctx->use_dsa > 2)
300 if (subprime_len == -1) {
301 if (prime_len >= 2048)
307 if (prime_len >= 2048)
312 if (dctx->use_dsa == 1)
313 rv = dsa_builtin_paramgen(ret, prime_len, subprime_len, md,
314 NULL, 0, NULL, NULL, NULL, pcb);
315 else if (dctx->use_dsa == 2)
316 rv = dsa_builtin_paramgen2(ret, prime_len, subprime_len, md,
317 NULL, 0, -1, NULL, NULL, NULL, pcb);
327 static int pkey_dh_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
330 DH_PKEY_CTX *dctx = ctx->data;
333 if (dctx->rfc5114_param) {
334 switch (dctx->rfc5114_param) {
336 dh = DH_get_1024_160();
340 dh = DH_get_2048_224();
344 dh = DH_get_2048_256();
350 EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh);
354 if (dctx->param_nid != 0) {
355 if ((dh = DH_new_by_nid(dctx->param_nid)) == NULL)
357 EVP_PKEY_assign(pkey, EVP_PKEY_DH, dh);
361 if (ctx->pkey_gencb) {
362 pcb = BN_GENCB_new();
365 evp_pkey_set_cb_translate(pcb, ctx);
368 #ifndef OPENSSL_NO_DSA
371 dsa_dh = dsa_dh_generate(dctx, pcb);
375 dh = DSA_dup_DH(dsa_dh);
379 EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh);
388 ret = DH_generate_parameters_ex(dh,
389 dctx->prime_len, dctx->generator, pcb);
392 EVP_PKEY_assign_DH(pkey, dh);
398 static int pkey_dh_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
400 DH_PKEY_CTX *dctx = ctx->data;
403 if (ctx->pkey == NULL && dctx->param_nid == 0) {
404 DHerr(DH_F_PKEY_DH_KEYGEN, DH_R_NO_PARAMETERS_SET);
407 if (dctx->param_nid != 0)
408 dh = DH_new_by_nid(dctx->param_nid);
413 EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, dh);
414 /* Note: if error return, pkey is freed by parent routine */
415 if (ctx->pkey != NULL && !EVP_PKEY_copy_parameters(pkey, ctx->pkey))
417 return DH_generate_key(pkey->pkey.dh);
420 static int pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
425 DH_PKEY_CTX *dctx = ctx->data;
427 if (!ctx->pkey || !ctx->peerkey) {
428 DHerr(DH_F_PKEY_DH_DERIVE, DH_R_KEYS_NOT_SET);
431 dh = ctx->pkey->pkey.dh;
432 dhpub = ctx->peerkey->pkey.dh->pub_key;
433 if (dctx->kdf_type == EVP_PKEY_DH_KDF_NONE) {
435 *keylen = DH_size(dh);
439 ret = DH_compute_key_padded(key, dhpub, dh);
441 ret = DH_compute_key(key, dhpub, dh);
447 #ifndef OPENSSL_NO_CMS
448 else if (dctx->kdf_type == EVP_PKEY_DH_KDF_X9_42) {
450 unsigned char *Z = NULL;
452 if (!dctx->kdf_outlen || !dctx->kdf_oid)
455 *keylen = dctx->kdf_outlen;
458 if (*keylen != dctx->kdf_outlen)
462 Z = OPENSSL_malloc(Zlen);
466 if (DH_compute_key_padded(Z, dhpub, dh) <= 0)
468 if (!DH_KDF_X9_42(key, *keylen, Z, Zlen, dctx->kdf_oid,
469 dctx->kdf_ukm, dctx->kdf_ukmlen, dctx->kdf_md))
471 *keylen = dctx->kdf_outlen;
474 OPENSSL_clear_free(Z, Zlen);
481 const EVP_PKEY_METHOD dh_pkey_meth = {
515 const EVP_PKEY_METHOD dhx_pkey_meth = {