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/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 */
29 /* message digest used for parameter generation */
32 /* Keygen callback info */
34 /* KDF (if any) to use for DH */
36 /* OID to use for KDF */
38 /* Message digest to use for key derivation */
40 /* User key material */
41 unsigned char *kdf_ukm;
43 /* KDF output length */
47 static int pkey_dh_init(EVP_PKEY_CTX *ctx)
51 dctx = OPENSSL_zalloc(sizeof(*dctx));
54 dctx->prime_len = 1024;
55 dctx->subprime_len = -1;
57 dctx->kdf_type = EVP_PKEY_DH_KDF_NONE;
60 ctx->keygen_info = dctx->gentmp;
61 ctx->keygen_info_count = 2;
66 static void pkey_dh_cleanup(EVP_PKEY_CTX *ctx)
68 DH_PKEY_CTX *dctx = ctx->data;
70 OPENSSL_free(dctx->kdf_ukm);
71 ASN1_OBJECT_free(dctx->kdf_oid);
77 static int pkey_dh_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
79 DH_PKEY_CTX *dctx, *sctx;
80 if (!pkey_dh_init(dst))
84 dctx->prime_len = sctx->prime_len;
85 dctx->subprime_len = sctx->subprime_len;
86 dctx->generator = sctx->generator;
87 dctx->use_dsa = sctx->use_dsa;
89 dctx->rfc5114_param = sctx->rfc5114_param;
91 dctx->kdf_type = sctx->kdf_type;
92 dctx->kdf_oid = OBJ_dup(sctx->kdf_oid);
93 if (dctx->kdf_oid == NULL)
95 dctx->kdf_md = sctx->kdf_md;
96 if (sctx->kdf_ukm != NULL) {
97 dctx->kdf_ukm = OPENSSL_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
98 if (dctx->kdf_ukm == NULL)
100 dctx->kdf_ukmlen = sctx->kdf_ukmlen;
102 dctx->kdf_outlen = sctx->kdf_outlen;
106 static int pkey_dh_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
108 DH_PKEY_CTX *dctx = ctx->data;
110 case EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN:
113 dctx->prime_len = p1;
116 case EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN:
117 if (dctx->use_dsa == 0)
119 dctx->subprime_len = p1;
122 case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR:
125 dctx->generator = p1;
128 case EVP_PKEY_CTRL_DH_PARAMGEN_TYPE:
129 #ifdef OPENSSL_NO_DSA
133 if (p1 < 0 || p1 > 2)
139 case EVP_PKEY_CTRL_DH_RFC5114:
140 if (p1 < 1 || p1 > 3)
142 dctx->rfc5114_param = p1;
145 case EVP_PKEY_CTRL_PEER_KEY:
146 /* Default behaviour is OK */
149 case EVP_PKEY_CTRL_DH_KDF_TYPE:
151 return dctx->kdf_type;
152 #ifdef OPENSSL_NO_CMS
153 if (p1 != EVP_PKEY_DH_KDF_NONE)
155 if (p1 != EVP_PKEY_DH_KDF_NONE && p1 != EVP_PKEY_DH_KDF_X9_42)
161 case EVP_PKEY_CTRL_DH_KDF_MD:
165 case EVP_PKEY_CTRL_GET_DH_KDF_MD:
166 *(const EVP_MD **)p2 = dctx->kdf_md;
169 case EVP_PKEY_CTRL_DH_KDF_OUTLEN:
172 dctx->kdf_outlen = (size_t)p1;
175 case EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN:
176 *(int *)p2 = dctx->kdf_outlen;
179 case EVP_PKEY_CTRL_DH_KDF_UKM:
180 OPENSSL_free(dctx->kdf_ukm);
183 dctx->kdf_ukmlen = p1;
185 dctx->kdf_ukmlen = 0;
188 case EVP_PKEY_CTRL_GET_DH_KDF_UKM:
189 *(unsigned char **)p2 = dctx->kdf_ukm;
190 return dctx->kdf_ukmlen;
192 case EVP_PKEY_CTRL_DH_KDF_OID:
193 ASN1_OBJECT_free(dctx->kdf_oid);
197 case EVP_PKEY_CTRL_GET_DH_KDF_OID:
198 *(ASN1_OBJECT **)p2 = dctx->kdf_oid;
207 static int pkey_dh_ctrl_str(EVP_PKEY_CTX *ctx,
208 const char *type, const char *value)
210 if (strcmp(type, "dh_paramgen_prime_len") == 0) {
213 return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len);
215 if (strcmp(type, "dh_rfc5114") == 0) {
216 DH_PKEY_CTX *dctx = ctx->data;
219 if (len < 0 || len > 3)
221 dctx->rfc5114_param = len;
224 if (strcmp(type, "dh_paramgen_generator") == 0) {
227 return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len);
229 if (strcmp(type, "dh_paramgen_subprime_len") == 0) {
232 return EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len);
234 if (strcmp(type, "dh_paramgen_type") == 0) {
237 return EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ);
242 #ifndef OPENSSL_NO_DSA
244 extern int dsa_builtin_paramgen(DSA *ret, size_t bits, size_t qbits,
246 const unsigned char *seed_in, size_t seed_len,
247 unsigned char *seed_out, int *counter_ret,
248 unsigned long *h_ret, BN_GENCB *cb);
250 extern int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
252 const unsigned char *seed_in,
253 size_t seed_len, int idx,
254 unsigned char *seed_out, int *counter_ret,
255 unsigned long *h_ret, BN_GENCB *cb);
257 static DSA *dsa_dh_generate(DH_PKEY_CTX *dctx, BN_GENCB *pcb)
261 int prime_len = dctx->prime_len;
262 int subprime_len = dctx->subprime_len;
263 const EVP_MD *md = dctx->md;
264 if (dctx->use_dsa > 2)
269 if (subprime_len == -1) {
270 if (prime_len >= 2048)
276 if (prime_len >= 2048)
281 if (dctx->use_dsa == 1)
282 rv = dsa_builtin_paramgen(ret, prime_len, subprime_len, md,
283 NULL, 0, NULL, NULL, NULL, pcb);
284 else if (dctx->use_dsa == 2)
285 rv = dsa_builtin_paramgen2(ret, prime_len, subprime_len, md,
286 NULL, 0, -1, NULL, NULL, NULL, pcb);
296 static int pkey_dh_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
299 DH_PKEY_CTX *dctx = ctx->data;
302 if (dctx->rfc5114_param) {
303 switch (dctx->rfc5114_param) {
305 dh = DH_get_1024_160();
309 dh = DH_get_2048_224();
313 dh = DH_get_2048_256();
319 EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh);
323 if (ctx->pkey_gencb) {
324 pcb = BN_GENCB_new();
327 evp_pkey_set_cb_translate(pcb, ctx);
330 #ifndef OPENSSL_NO_DSA
333 dsa_dh = dsa_dh_generate(dctx, pcb);
337 dh = DSA_dup_DH(dsa_dh);
341 EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh);
350 ret = DH_generate_parameters_ex(dh,
351 dctx->prime_len, dctx->generator, pcb);
354 EVP_PKEY_assign_DH(pkey, dh);
360 static int pkey_dh_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
363 if (ctx->pkey == NULL) {
364 DHerr(DH_F_PKEY_DH_KEYGEN, DH_R_NO_PARAMETERS_SET);
370 EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, dh);
371 /* Note: if error return, pkey is freed by parent routine */
372 if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
374 return DH_generate_key(pkey->pkey.dh);
377 static int pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
382 DH_PKEY_CTX *dctx = ctx->data;
384 if (!ctx->pkey || !ctx->peerkey) {
385 DHerr(DH_F_PKEY_DH_DERIVE, DH_R_KEYS_NOT_SET);
388 dh = ctx->pkey->pkey.dh;
389 dhpub = ctx->peerkey->pkey.dh->pub_key;
390 if (dctx->kdf_type == EVP_PKEY_DH_KDF_NONE) {
392 *keylen = DH_size(dh);
395 ret = DH_compute_key(key, dhpub, dh);
401 #ifndef OPENSSL_NO_CMS
402 else if (dctx->kdf_type == EVP_PKEY_DH_KDF_X9_42) {
404 unsigned char *Z = NULL;
406 if (!dctx->kdf_outlen || !dctx->kdf_oid)
409 *keylen = dctx->kdf_outlen;
412 if (*keylen != dctx->kdf_outlen)
416 Z = OPENSSL_malloc(Zlen);
420 if (DH_compute_key_padded(Z, dhpub, dh) <= 0)
422 if (!DH_KDF_X9_42(key, *keylen, Z, Zlen, dctx->kdf_oid,
423 dctx->kdf_ukm, dctx->kdf_ukmlen, dctx->kdf_md))
425 *keylen = dctx->kdf_outlen;
428 OPENSSL_clear_free(Z, Zlen);
435 const EVP_PKEY_METHOD dh_pkey_meth = {
469 const EVP_PKEY_METHOD dhx_pkey_meth = {