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 #if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_EC)
27 /* TODO(3.0) remove when provider SM2 key generation is implemented */
29 # include <openssl/ec.h>
30 # include <openssl/serializer.h>
31 # include "internal/sizes.h"
34 static int gen_init(EVP_PKEY_CTX *ctx, int operation)
41 evp_pkey_ctx_free_old_ops(ctx);
42 ctx->operation = operation;
44 if (ctx->keymgmt == NULL || ctx->keymgmt->gen_init == NULL)
47 /* TODO remove when provider SM2 key generation is implemented */
49 if (ctx->pmeth != NULL && ctx->pmeth->pkey_id == EVP_PKEY_SM2)
54 case EVP_PKEY_OP_PARAMGEN:
55 ctx->op.keymgmt.genctx =
56 evp_keymgmt_gen_init(ctx->keymgmt,
57 OSSL_KEYMGMT_SELECT_ALL_PARAMETERS);
59 case EVP_PKEY_OP_KEYGEN:
60 ctx->op.keymgmt.genctx =
61 evp_keymgmt_gen_init(ctx->keymgmt, OSSL_KEYMGMT_SELECT_KEYPAIR);
65 if (ctx->op.keymgmt.genctx == NULL)
66 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
75 if (ctx->pmeth == NULL
76 || (operation == EVP_PKEY_OP_PARAMGEN
77 && ctx->pmeth->paramgen == NULL)
78 || (operation == EVP_PKEY_OP_KEYGEN
79 && ctx->pmeth->keygen == NULL))
84 case EVP_PKEY_OP_PARAMGEN:
85 if (ctx->pmeth->paramgen_init != NULL)
86 ret = ctx->pmeth->paramgen_init(ctx);
88 case EVP_PKEY_OP_KEYGEN:
89 if (ctx->pmeth->keygen_init != NULL)
90 ret = ctx->pmeth->keygen_init(ctx);
96 if (ret <= 0 && ctx != NULL)
97 ctx->operation = EVP_PKEY_OP_UNDEFINED;
101 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
106 int EVP_PKEY_paramgen_init(EVP_PKEY_CTX *ctx)
108 return gen_init(ctx, EVP_PKEY_OP_PARAMGEN);
111 int EVP_PKEY_keygen_init(EVP_PKEY_CTX *ctx)
113 return gen_init(ctx, EVP_PKEY_OP_KEYGEN);
116 static int ossl_callback_to_pkey_gencb(const OSSL_PARAM params[], void *arg)
118 EVP_PKEY_CTX *ctx = arg;
119 const OSSL_PARAM *param = NULL;
122 if (ctx->pkey_gencb == NULL)
123 return 1; /* No callback? That's fine */
125 if ((param = OSSL_PARAM_locate_const(params, OSSL_GEN_PARAM_POTENTIAL))
127 || !OSSL_PARAM_get_int(param, &p))
129 if ((param = OSSL_PARAM_locate_const(params, OSSL_GEN_PARAM_ITERATION))
131 || !OSSL_PARAM_get_int(param, &n))
134 ctx->keygen_info[0] = p;
135 ctx->keygen_info[1] = n;
137 return ctx->pkey_gencb(ctx);
140 int EVP_PKEY_gen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
144 EVP_PKEY *allocated_pkey = NULL;
152 if ((ctx->operation & EVP_PKEY_OP_TYPE_GEN) == 0)
153 goto not_initialized;
156 *ppkey = allocated_pkey = EVP_PKEY_new();
158 if (*ppkey == NULL) {
159 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
163 if (ctx->op.keymgmt.genctx == NULL)
167 if (ctx->pkey != NULL) {
168 EVP_KEYMGMT *tmp_keymgmt = ctx->keymgmt;
170 evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
171 &tmp_keymgmt, ctx->propquery);
173 if (tmp_keymgmt == NULL)
176 * It's ok if keydata is NULL here. The backend is expected to deal
177 * with that as it sees fit.
179 ret = evp_keymgmt_gen_set_template(ctx->keymgmt,
180 ctx->op.keymgmt.genctx, keydata);
184 * the returned value from evp_keymgmt_util_gen() is cached in *ppkey,
185 * so we so not need to save it, just check it.
188 && (evp_keymgmt_util_gen(*ppkey, ctx->keymgmt, ctx->op.keymgmt.genctx,
189 ossl_callback_to_pkey_gencb, ctx)
193 /* In case |*ppkey| was originally a legacy key */
195 evp_pkey_free_legacy(*ppkey);
198 /* TODO remove when SM2 key have been cleanly separated from EC keys */
201 * Legacy SM2 keys are implemented as EC_KEY with a twist. The legacy
202 * key generation detects the SM2 curve and "magically" changes the pkey
204 * Since we don't have SM2 in the provider implementation, we need to
205 * downgrade the generated provider side key to a legacy one under the
208 * THIS IS AN UGLY BUT TEMPORARY HACK
211 char curve_name[OSSL_MAX_NAME_SIZE] = "";
213 if (!EVP_PKEY_get_utf8_string_param(*ppkey, OSSL_PKEY_PARAM_EC_NAME,
214 curve_name, sizeof(curve_name),
216 || strcmp(curve_name, "SM2") != 0)
220 if (!evp_pkey_downgrade(*ppkey)
221 || !EVP_PKEY_set_alias_type(*ppkey, EVP_PKEY_SM2))
230 if (ctx->pkey && !evp_pkey_downgrade(ctx->pkey))
232 switch (ctx->operation) {
233 case EVP_PKEY_OP_PARAMGEN:
234 ret = ctx->pmeth->paramgen(ctx, *ppkey);
236 case EVP_PKEY_OP_KEYGEN:
237 ret = ctx->pmeth->keygen(ctx, *ppkey);
246 if (allocated_pkey != NULL)
248 EVP_PKEY_free(allocated_pkey);
253 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
257 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATON_NOT_INITIALIZED);
262 ERR_raise(ERR_LIB_EVP, EVP_R_INACCESSIBLE_DOMAIN_PARAMETERS);
268 int EVP_PKEY_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
270 if (ctx->operation != EVP_PKEY_OP_PARAMGEN) {
271 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATON_NOT_INITIALIZED);
274 return EVP_PKEY_gen(ctx, ppkey);
277 int EVP_PKEY_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
279 if (ctx->operation != EVP_PKEY_OP_KEYGEN) {
280 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATON_NOT_INITIALIZED);
283 return EVP_PKEY_gen(ctx, ppkey);
286 void EVP_PKEY_CTX_set_cb(EVP_PKEY_CTX *ctx, EVP_PKEY_gen_cb *cb)
288 ctx->pkey_gencb = cb;
291 EVP_PKEY_gen_cb *EVP_PKEY_CTX_get_cb(EVP_PKEY_CTX *ctx)
293 return ctx->pkey_gencb;
297 * "translation callback" to call EVP_PKEY_CTX callbacks using BN_GENCB style
301 static int trans_cb(int a, int b, BN_GENCB *gcb)
303 EVP_PKEY_CTX *ctx = BN_GENCB_get_arg(gcb);
304 ctx->keygen_info[0] = a;
305 ctx->keygen_info[1] = b;
306 return ctx->pkey_gencb(ctx);
309 void evp_pkey_set_cb_translate(BN_GENCB *cb, EVP_PKEY_CTX *ctx)
311 BN_GENCB_set(cb, trans_cb, ctx);
314 int EVP_PKEY_CTX_get_keygen_info(EVP_PKEY_CTX *ctx, int idx)
317 return ctx->keygen_info_count;
318 if (idx < 0 || idx > ctx->keygen_info_count)
320 return ctx->keygen_info[idx];
325 EVP_PKEY *EVP_PKEY_new_mac_key(int type, ENGINE *e,
326 const unsigned char *key, int keylen)
328 EVP_PKEY_CTX *mac_ctx = NULL;
329 EVP_PKEY *mac_key = NULL;
330 mac_ctx = EVP_PKEY_CTX_new_id(type, e);
333 if (EVP_PKEY_keygen_init(mac_ctx) <= 0)
335 if (EVP_PKEY_CTX_set_mac_key(mac_ctx, key, keylen) <= 0)
337 if (EVP_PKEY_keygen(mac_ctx, &mac_key) <= 0)
340 EVP_PKEY_CTX_free(mac_ctx);
344 #endif /* FIPS_MODULE */
346 /*- All methods below can also be used in FIPS_MODULE */
348 static int fromdata_init(EVP_PKEY_CTX *ctx, int operation)
350 if (ctx == NULL || ctx->keytype == NULL)
353 evp_pkey_ctx_free_old_ops(ctx);
354 if (ctx->keymgmt == NULL)
357 ctx->operation = operation;
361 ctx->operation = EVP_PKEY_OP_UNDEFINED;
362 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
366 int EVP_PKEY_param_fromdata_init(EVP_PKEY_CTX *ctx)
368 return fromdata_init(ctx, EVP_PKEY_OP_PARAMFROMDATA);
371 int EVP_PKEY_key_fromdata_init(EVP_PKEY_CTX *ctx)
373 return fromdata_init(ctx, EVP_PKEY_OP_KEYFROMDATA);
376 int EVP_PKEY_fromdata(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey, OSSL_PARAM params[])
378 void *keydata = NULL;
381 if (ctx == NULL || (ctx->operation & EVP_PKEY_OP_TYPE_FROMDATA) == 0) {
382 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
390 *ppkey = EVP_PKEY_new();
392 if (*ppkey == NULL) {
393 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
397 if (ctx->operation == EVP_PKEY_OP_PARAMFROMDATA)
398 selection = OSSL_KEYMGMT_SELECT_ALL_PARAMETERS;
400 selection = OSSL_KEYMGMT_SELECT_ALL;
401 keydata = evp_keymgmt_util_fromdata(*ppkey, ctx->keymgmt, selection,
406 /* keydata is cached in *ppkey, so we need not bother with it further */
411 * TODO(3.0) Re-evaluate the names, it's possible that we find these to be
414 * EVP_PKEY_param_settable()
415 * EVP_PKEY_param_gettable()
417 const OSSL_PARAM *EVP_PKEY_param_fromdata_settable(EVP_PKEY_CTX *ctx)
419 /* We call fromdata_init to get ctx->keymgmt populated */
420 if (fromdata_init(ctx, EVP_PKEY_OP_UNDEFINED))
421 return evp_keymgmt_import_types(ctx->keymgmt,
422 OSSL_KEYMGMT_SELECT_ALL_PARAMETERS);
426 const OSSL_PARAM *EVP_PKEY_key_fromdata_settable(EVP_PKEY_CTX *ctx)
428 /* We call fromdata_init to get ctx->keymgmt populated */
429 if (fromdata_init(ctx, EVP_PKEY_OP_UNDEFINED))
430 return evp_keymgmt_import_types(ctx->keymgmt,
431 OSSL_KEYMGMT_SELECT_ALL);