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
12 #include <openssl/core.h>
13 #include <openssl/core_names.h>
14 #include "internal/cryptlib.h"
15 #include "internal/core.h"
16 #include <openssl/objects.h>
17 #include <openssl/evp.h>
18 #include "crypto/bn.h"
19 #include "crypto/asn1.h"
20 #include "crypto/evp.h"
21 #include "evp_local.h"
23 /* TODO(3.0) remove when provider SM2 key generation is implemented */
25 # include <openssl/ec.h>
26 # include "internal/sizes.h"
29 static int gen_init(EVP_PKEY_CTX *ctx, int operation)
36 evp_pkey_ctx_free_old_ops(ctx);
37 ctx->operation = operation;
39 if (ctx->keymgmt == NULL || ctx->keymgmt->gen_init == NULL)
42 /* TODO remove when provider SM2 key generation is implemented */
44 if (ctx->pmeth != NULL && ctx->pmeth->pkey_id == EVP_PKEY_SM2)
49 case EVP_PKEY_OP_PARAMGEN:
50 ctx->op.keymgmt.genctx =
51 evp_keymgmt_gen_init(ctx->keymgmt,
52 OSSL_KEYMGMT_SELECT_ALL_PARAMETERS);
54 case EVP_PKEY_OP_KEYGEN:
55 ctx->op.keymgmt.genctx =
56 evp_keymgmt_gen_init(ctx->keymgmt, OSSL_KEYMGMT_SELECT_KEYPAIR);
60 if (ctx->op.keymgmt.genctx == NULL)
61 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
70 if (ctx->pmeth == NULL
71 || (operation == EVP_PKEY_OP_PARAMGEN
72 && ctx->pmeth->paramgen == NULL)
73 || (operation == EVP_PKEY_OP_KEYGEN
74 && ctx->pmeth->keygen == NULL))
79 case EVP_PKEY_OP_PARAMGEN:
80 if (ctx->pmeth->paramgen_init != NULL)
81 ret = ctx->pmeth->paramgen_init(ctx);
83 case EVP_PKEY_OP_KEYGEN:
84 if (ctx->pmeth->keygen_init != NULL)
85 ret = ctx->pmeth->keygen_init(ctx);
91 if (ret <= 0 && ctx != NULL) {
92 evp_pkey_ctx_free_old_ops(ctx);
93 ctx->operation = EVP_PKEY_OP_UNDEFINED;
98 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
103 int EVP_PKEY_paramgen_init(EVP_PKEY_CTX *ctx)
105 return gen_init(ctx, EVP_PKEY_OP_PARAMGEN);
108 int EVP_PKEY_keygen_init(EVP_PKEY_CTX *ctx)
110 return gen_init(ctx, EVP_PKEY_OP_KEYGEN);
113 static int ossl_callback_to_pkey_gencb(const OSSL_PARAM params[], void *arg)
115 EVP_PKEY_CTX *ctx = arg;
116 const OSSL_PARAM *param = NULL;
119 if (ctx->pkey_gencb == NULL)
120 return 1; /* No callback? That's fine */
122 if ((param = OSSL_PARAM_locate_const(params, OSSL_GEN_PARAM_POTENTIAL))
124 || !OSSL_PARAM_get_int(param, &p))
126 if ((param = OSSL_PARAM_locate_const(params, OSSL_GEN_PARAM_ITERATION))
128 || !OSSL_PARAM_get_int(param, &n))
131 ctx->keygen_info[0] = p;
132 ctx->keygen_info[1] = n;
134 return ctx->pkey_gencb(ctx);
137 int EVP_PKEY_gen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
141 EVP_PKEY *allocated_pkey = NULL;
142 /* Legacy compatible keygen callback info, only used with provider impls */
151 if ((ctx->operation & EVP_PKEY_OP_TYPE_GEN) == 0)
152 goto not_initialized;
155 *ppkey = allocated_pkey = EVP_PKEY_new();
157 if (*ppkey == NULL) {
158 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
162 if (ctx->op.keymgmt.genctx == NULL)
166 * Asssigning gentmp to ctx->keygen_info is something our legacy
167 * implementations do. Because the provider implementations aren't
168 * allowed to reach into our EVP_PKEY_CTX, we need to provide similar
169 * space for backward compatibility. It's ok that we attach a local
170 * variable, as it should only be useful in the calls down from here.
171 * This is cleared as soon as it isn't useful any more, i.e. directly
172 * after the evp_keymgmt_util_gen() call.
174 ctx->keygen_info = gentmp;
175 ctx->keygen_info_count = 2;
178 if (ctx->pkey != NULL) {
179 EVP_KEYMGMT *tmp_keymgmt = ctx->keymgmt;
181 evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
182 &tmp_keymgmt, ctx->propquery);
184 if (tmp_keymgmt == NULL)
187 * It's ok if keydata is NULL here. The backend is expected to deal
188 * with that as it sees fit.
190 ret = evp_keymgmt_gen_set_template(ctx->keymgmt,
191 ctx->op.keymgmt.genctx, keydata);
195 * the returned value from evp_keymgmt_util_gen() is cached in *ppkey,
196 * so we so not need to save it, just check it.
199 && (evp_keymgmt_util_gen(*ppkey, ctx->keymgmt, ctx->op.keymgmt.genctx,
200 ossl_callback_to_pkey_gencb, ctx)
203 ctx->keygen_info = NULL;
206 /* In case |*ppkey| was originally a legacy key */
208 evp_pkey_free_legacy(*ppkey);
212 * Because we still have legacy keys, and evp_pkey_downgrade()
213 * TODO remove this #legacy internal keys are gone
215 (*ppkey)->type = ctx->legacy_keytype;
217 /* TODO remove when SM2 key have been cleanly separated from EC keys */
220 * Legacy SM2 keys are implemented as EC_KEY with a twist. The legacy
221 * key generation detects the SM2 curve and "magically" changes the pkey
223 * Since we don't have SM2 in the provider implementation, we need to
224 * downgrade the generated provider side key to a legacy one under the
227 * THIS IS AN UGLY BUT TEMPORARY HACK
230 char curve_name[OSSL_MAX_NAME_SIZE] = "";
232 if (!EVP_PKEY_get_utf8_string_param(*ppkey, OSSL_PKEY_PARAM_GROUP_NAME,
233 curve_name, sizeof(curve_name),
235 || strcmp(curve_name, "SM2") != 0)
239 if (!evp_pkey_downgrade(*ppkey)
240 || !EVP_PKEY_set_alias_type(*ppkey, EVP_PKEY_SM2))
249 if (ctx->pkey && !evp_pkey_downgrade(ctx->pkey))
251 switch (ctx->operation) {
252 case EVP_PKEY_OP_PARAMGEN:
253 ret = ctx->pmeth->paramgen(ctx, *ppkey);
255 case EVP_PKEY_OP_KEYGEN:
256 ret = ctx->pmeth->keygen(ctx, *ppkey);
265 if (allocated_pkey != NULL)
267 EVP_PKEY_free(allocated_pkey);
272 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
276 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATON_NOT_INITIALIZED);
281 ERR_raise(ERR_LIB_EVP, EVP_R_INACCESSIBLE_DOMAIN_PARAMETERS);
287 int EVP_PKEY_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
289 if (ctx->operation != EVP_PKEY_OP_PARAMGEN) {
290 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATON_NOT_INITIALIZED);
293 return EVP_PKEY_gen(ctx, ppkey);
296 int EVP_PKEY_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
298 if (ctx->operation != EVP_PKEY_OP_KEYGEN) {
299 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATON_NOT_INITIALIZED);
302 return EVP_PKEY_gen(ctx, ppkey);
305 void EVP_PKEY_CTX_set_cb(EVP_PKEY_CTX *ctx, EVP_PKEY_gen_cb *cb)
307 ctx->pkey_gencb = cb;
310 EVP_PKEY_gen_cb *EVP_PKEY_CTX_get_cb(EVP_PKEY_CTX *ctx)
312 return ctx->pkey_gencb;
316 * "translation callback" to call EVP_PKEY_CTX callbacks using BN_GENCB style
320 static int trans_cb(int a, int b, BN_GENCB *gcb)
322 EVP_PKEY_CTX *ctx = BN_GENCB_get_arg(gcb);
323 ctx->keygen_info[0] = a;
324 ctx->keygen_info[1] = b;
325 return ctx->pkey_gencb(ctx);
328 void evp_pkey_set_cb_translate(BN_GENCB *cb, EVP_PKEY_CTX *ctx)
330 BN_GENCB_set(cb, trans_cb, ctx);
333 int EVP_PKEY_CTX_get_keygen_info(EVP_PKEY_CTX *ctx, int idx)
336 return ctx->keygen_info_count;
337 if (idx < 0 || idx > ctx->keygen_info_count)
339 return ctx->keygen_info[idx];
344 EVP_PKEY *EVP_PKEY_new_mac_key(int type, ENGINE *e,
345 const unsigned char *key, int keylen)
347 EVP_PKEY_CTX *mac_ctx = NULL;
348 EVP_PKEY *mac_key = NULL;
349 mac_ctx = EVP_PKEY_CTX_new_id(type, e);
352 if (EVP_PKEY_keygen_init(mac_ctx) <= 0)
354 if (EVP_PKEY_CTX_set_mac_key(mac_ctx, key, keylen) <= 0)
356 if (EVP_PKEY_keygen(mac_ctx, &mac_key) <= 0)
359 EVP_PKEY_CTX_free(mac_ctx);
363 #endif /* FIPS_MODULE */
365 /*- All methods below can also be used in FIPS_MODULE */
367 static int fromdata_init(EVP_PKEY_CTX *ctx, int operation)
369 if (ctx == NULL || ctx->keytype == NULL)
372 evp_pkey_ctx_free_old_ops(ctx);
373 if (ctx->keymgmt == NULL)
376 ctx->operation = operation;
381 ctx->operation = EVP_PKEY_OP_UNDEFINED;
382 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
386 int EVP_PKEY_param_fromdata_init(EVP_PKEY_CTX *ctx)
388 return fromdata_init(ctx, EVP_PKEY_OP_PARAMFROMDATA);
391 int EVP_PKEY_key_fromdata_init(EVP_PKEY_CTX *ctx)
393 return fromdata_init(ctx, EVP_PKEY_OP_KEYFROMDATA);
396 int EVP_PKEY_fromdata(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey, OSSL_PARAM params[])
398 void *keydata = NULL;
401 if (ctx == NULL || (ctx->operation & EVP_PKEY_OP_TYPE_FROMDATA) == 0) {
402 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
410 *ppkey = EVP_PKEY_new();
412 if (*ppkey == NULL) {
413 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
417 if (ctx->operation == EVP_PKEY_OP_PARAMFROMDATA)
418 selection = OSSL_KEYMGMT_SELECT_ALL_PARAMETERS;
420 selection = OSSL_KEYMGMT_SELECT_ALL;
421 keydata = evp_keymgmt_util_fromdata(*ppkey, ctx->keymgmt, selection,
426 /* keydata is cached in *ppkey, so we need not bother with it further */
431 * TODO(3.0) Re-evaluate the names, it's possible that we find these to be
434 * EVP_PKEY_param_settable()
435 * EVP_PKEY_param_gettable()
437 const OSSL_PARAM *EVP_PKEY_param_fromdata_settable(EVP_PKEY_CTX *ctx)
439 /* We call fromdata_init to get ctx->keymgmt populated */
440 if (fromdata_init(ctx, EVP_PKEY_OP_UNDEFINED))
441 return evp_keymgmt_import_types(ctx->keymgmt,
442 OSSL_KEYMGMT_SELECT_ALL_PARAMETERS);
446 const OSSL_PARAM *EVP_PKEY_key_fromdata_settable(EVP_PKEY_CTX *ctx)
448 /* We call fromdata_init to get ctx->keymgmt populated */
449 if (fromdata_init(ctx, EVP_PKEY_OP_UNDEFINED))
450 return evp_keymgmt_import_types(ctx->keymgmt,
451 OSSL_KEYMGMT_SELECT_ALL);