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 "crypto/evp.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
= 2048;
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
;
84 if (!pkey_dh_init(dst
))
88 dctx
->prime_len
= sctx
->prime_len
;
89 dctx
->subprime_len
= sctx
->subprime_len
;
90 dctx
->generator
= sctx
->generator
;
91 dctx
->use_dsa
= sctx
->use_dsa
;
92 dctx
->pad
= sctx
->pad
;
94 dctx
->rfc5114_param
= sctx
->rfc5114_param
;
95 dctx
->param_nid
= sctx
->param_nid
;
97 dctx
->kdf_type
= sctx
->kdf_type
;
98 dctx
->kdf_oid
= OBJ_dup(sctx
->kdf_oid
);
99 if (dctx
->kdf_oid
== NULL
)
101 dctx
->kdf_md
= sctx
->kdf_md
;
102 if (sctx
->kdf_ukm
!= NULL
) {
103 dctx
->kdf_ukm
= OPENSSL_memdup(sctx
->kdf_ukm
, sctx
->kdf_ukmlen
);
104 if (dctx
->kdf_ukm
== NULL
)
106 dctx
->kdf_ukmlen
= sctx
->kdf_ukmlen
;
108 dctx
->kdf_outlen
= sctx
->kdf_outlen
;
112 static int pkey_dh_ctrl(EVP_PKEY_CTX
*ctx
, int type
, int p1
, void *p2
)
114 DH_PKEY_CTX
*dctx
= ctx
->data
;
116 case EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN
:
119 dctx
->prime_len
= p1
;
122 case EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN
:
123 if (dctx
->use_dsa
== 0)
125 dctx
->subprime_len
= p1
;
128 case EVP_PKEY_CTRL_DH_PAD
:
132 case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR
:
135 dctx
->generator
= p1
;
138 case EVP_PKEY_CTRL_DH_PARAMGEN_TYPE
:
139 #ifdef OPENSSL_NO_DSA
143 if (p1
< 0 || p1
> 2)
149 case EVP_PKEY_CTRL_DH_RFC5114
:
150 if (p1
< 1 || p1
> 3 || dctx
->param_nid
!= NID_undef
)
152 dctx
->rfc5114_param
= p1
;
155 case EVP_PKEY_CTRL_DH_NID
:
156 if (p1
<= 0 || dctx
->rfc5114_param
!= 0)
158 dctx
->param_nid
= p1
;
161 case EVP_PKEY_CTRL_PEER_KEY
:
162 /* Default behaviour is OK */
165 case EVP_PKEY_CTRL_DH_KDF_TYPE
:
167 return dctx
->kdf_type
;
168 #ifdef OPENSSL_NO_CMS
169 if (p1
!= EVP_PKEY_DH_KDF_NONE
)
171 if (p1
!= EVP_PKEY_DH_KDF_NONE
&& p1
!= EVP_PKEY_DH_KDF_X9_42
)
177 case EVP_PKEY_CTRL_DH_KDF_MD
:
181 case EVP_PKEY_CTRL_GET_DH_KDF_MD
:
182 *(const EVP_MD
**)p2
= dctx
->kdf_md
;
185 case EVP_PKEY_CTRL_DH_KDF_OUTLEN
:
188 dctx
->kdf_outlen
= (size_t)p1
;
191 case EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN
:
192 *(int *)p2
= dctx
->kdf_outlen
;
195 case EVP_PKEY_CTRL_DH_KDF_UKM
:
196 OPENSSL_free(dctx
->kdf_ukm
);
199 dctx
->kdf_ukmlen
= p1
;
201 dctx
->kdf_ukmlen
= 0;
204 case EVP_PKEY_CTRL_GET_DH_KDF_UKM
:
205 *(unsigned char **)p2
= dctx
->kdf_ukm
;
206 return dctx
->kdf_ukmlen
;
208 case EVP_PKEY_CTRL_DH_KDF_OID
:
209 ASN1_OBJECT_free(dctx
->kdf_oid
);
213 case EVP_PKEY_CTRL_GET_DH_KDF_OID
:
214 *(ASN1_OBJECT
**)p2
= dctx
->kdf_oid
;
223 static int pkey_dh_ctrl_str(EVP_PKEY_CTX
*ctx
,
224 const char *type
, const char *value
)
226 if (strcmp(type
, "dh_paramgen_prime_len") == 0) {
229 return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx
, len
);
231 if (strcmp(type
, "dh_rfc5114") == 0) {
232 DH_PKEY_CTX
*dctx
= ctx
->data
;
235 if (len
< 0 || len
> 3)
237 dctx
->rfc5114_param
= len
;
240 if (strcmp(type
, "dh_param") == 0) {
241 DH_PKEY_CTX
*dctx
= ctx
->data
;
242 int nid
= OBJ_sn2nid(value
);
244 if (nid
== NID_undef
) {
245 DHerr(DH_F_PKEY_DH_CTRL_STR
, DH_R_INVALID_PARAMETER_NAME
);
248 dctx
->param_nid
= nid
;
251 if (strcmp(type
, "dh_paramgen_generator") == 0) {
254 return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx
, len
);
256 if (strcmp(type
, "dh_paramgen_subprime_len") == 0) {
259 return EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx
, len
);
261 if (strcmp(type
, "dh_paramgen_type") == 0) {
264 return EVP_PKEY_CTX_set_dh_paramgen_type(ctx
, typ
);
266 if (strcmp(type
, "dh_pad") == 0) {
269 return EVP_PKEY_CTX_set_dh_pad(ctx
, pad
);
274 #ifndef OPENSSL_NO_DSA
276 extern int dsa_builtin_paramgen(DSA
*ret
, size_t bits
, size_t qbits
,
278 const unsigned char *seed_in
, size_t seed_len
,
279 unsigned char *seed_out
, int *counter_ret
,
280 unsigned long *h_ret
, BN_GENCB
*cb
);
282 extern int dsa_builtin_paramgen2(DSA
*ret
, size_t L
, size_t N
,
284 const unsigned char *seed_in
,
285 size_t seed_len
, int idx
,
286 unsigned char *seed_out
, int *counter_ret
,
287 unsigned long *h_ret
, BN_GENCB
*cb
);
289 static DSA
*dsa_dh_generate(DH_PKEY_CTX
*dctx
, BN_GENCB
*pcb
)
293 int prime_len
= dctx
->prime_len
;
294 int subprime_len
= dctx
->subprime_len
;
295 const EVP_MD
*md
= dctx
->md
;
296 if (dctx
->use_dsa
> 2)
301 if (subprime_len
== -1) {
302 if (prime_len
>= 2048)
308 if (prime_len
>= 2048)
313 if (dctx
->use_dsa
== 1)
314 rv
= dsa_builtin_paramgen(ret
, prime_len
, subprime_len
, md
,
315 NULL
, 0, NULL
, NULL
, NULL
, pcb
);
316 else if (dctx
->use_dsa
== 2)
317 rv
= dsa_builtin_paramgen2(ret
, prime_len
, subprime_len
, md
,
318 NULL
, 0, -1, NULL
, NULL
, NULL
, pcb
);
328 static int pkey_dh_paramgen(EVP_PKEY_CTX
*ctx
, EVP_PKEY
*pkey
)
331 DH_PKEY_CTX
*dctx
= ctx
->data
;
334 if (dctx
->rfc5114_param
) {
335 switch (dctx
->rfc5114_param
) {
337 dh
= DH_get_1024_160();
341 dh
= DH_get_2048_224();
345 dh
= DH_get_2048_256();
351 EVP_PKEY_assign(pkey
, EVP_PKEY_DHX
, dh
);
355 if (dctx
->param_nid
!= 0) {
356 if ((dh
= DH_new_by_nid(dctx
->param_nid
)) == NULL
)
358 EVP_PKEY_assign(pkey
, EVP_PKEY_DH
, dh
);
362 if (ctx
->pkey_gencb
) {
363 pcb
= BN_GENCB_new();
366 evp_pkey_set_cb_translate(pcb
, ctx
);
369 #ifndef OPENSSL_NO_DSA
372 dsa_dh
= dsa_dh_generate(dctx
, pcb
);
376 dh
= DSA_dup_DH(dsa_dh
);
380 EVP_PKEY_assign(pkey
, EVP_PKEY_DHX
, dh
);
389 ret
= DH_generate_parameters_ex(dh
,
390 dctx
->prime_len
, dctx
->generator
, pcb
);
393 EVP_PKEY_assign_DH(pkey
, dh
);
399 static int pkey_dh_keygen(EVP_PKEY_CTX
*ctx
, EVP_PKEY
*pkey
)
401 DH_PKEY_CTX
*dctx
= ctx
->data
;
404 if (ctx
->pkey
== NULL
&& dctx
->param_nid
== 0) {
405 DHerr(DH_F_PKEY_DH_KEYGEN
, DH_R_NO_PARAMETERS_SET
);
408 if (dctx
->param_nid
!= 0)
409 dh
= DH_new_by_nid(dctx
->param_nid
);
414 EVP_PKEY_assign(pkey
, ctx
->pmeth
->pkey_id
, dh
);
415 /* Note: if error return, pkey is freed by parent routine */
416 if (ctx
->pkey
!= NULL
&& !EVP_PKEY_copy_parameters(pkey
, ctx
->pkey
))
418 return DH_generate_key(pkey
->pkey
.dh
);
421 static int pkey_dh_derive(EVP_PKEY_CTX
*ctx
, unsigned char *key
,
426 DH_PKEY_CTX
*dctx
= ctx
->data
;
428 if (!ctx
->pkey
|| !ctx
->peerkey
) {
429 DHerr(DH_F_PKEY_DH_DERIVE
, DH_R_KEYS_NOT_SET
);
432 dh
= ctx
->pkey
->pkey
.dh
;
433 dhpub
= ctx
->peerkey
->pkey
.dh
->pub_key
;
434 if (dctx
->kdf_type
== EVP_PKEY_DH_KDF_NONE
) {
436 *keylen
= DH_size(dh
);
440 ret
= DH_compute_key_padded(key
, dhpub
, dh
);
442 ret
= DH_compute_key(key
, dhpub
, dh
);
448 #ifndef OPENSSL_NO_CMS
449 else if (dctx
->kdf_type
== EVP_PKEY_DH_KDF_X9_42
) {
451 unsigned char *Z
= NULL
;
453 if (!dctx
->kdf_outlen
|| !dctx
->kdf_oid
)
456 *keylen
= dctx
->kdf_outlen
;
459 if (*keylen
!= dctx
->kdf_outlen
)
463 Z
= OPENSSL_malloc(Zlen
);
467 if (DH_compute_key_padded(Z
, dhpub
, dh
) <= 0)
469 if (!DH_KDF_X9_42(key
, *keylen
, Z
, Zlen
, dctx
->kdf_oid
,
470 dctx
->kdf_ukm
, dctx
->kdf_ukmlen
, dctx
->kdf_md
))
472 *keylen
= dctx
->kdf_outlen
;
475 OPENSSL_clear_free(Z
, Zlen
);
482 static const EVP_PKEY_METHOD dh_pkey_meth
= {
516 const EVP_PKEY_METHOD
*dh_pkey_method(void)
518 return &dh_pkey_meth
;
521 static const EVP_PKEY_METHOD dhx_pkey_meth
= {
555 const EVP_PKEY_METHOD
*dhx_pkey_method(void)
557 return &dhx_pkey_meth
;