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/*
* Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <stdlib.h>
#include <openssl/core.h>
#include <openssl/core_names.h>
#include "internal/cryptlib.h"
#include "internal/core.h"
#include <openssl/objects.h>
#include <openssl/evp.h>
#include "crypto/bn.h"
#include "crypto/asn1.h"
#include "crypto/evp.h"
#include "evp_local.h"
#if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_EC)
# define TMP_SM2_HACK
#endif
/* TODO(3.0) remove when provider SM2 key generation is implemented */
#ifdef TMP_SM2_HACK
# include <openssl/ec.h>
# include "internal/sizes.h"
#endif
static int gen_init(EVP_PKEY_CTX *ctx, int operation)
{
int ret = 0;
if (ctx == NULL)
goto not_supported;
evp_pkey_ctx_free_old_ops(ctx);
ctx->operation = operation;
if (ctx->keymgmt == NULL || ctx->keymgmt->gen_init == NULL)
goto legacy;
/* TODO remove when provider SM2 key generation is implemented */
#ifdef TMP_SM2_HACK
if (ctx->pmeth != NULL && ctx->pmeth->pkey_id == EVP_PKEY_SM2)
goto legacy;
#endif
switch (operation) {
case EVP_PKEY_OP_PARAMGEN:
ctx->op.keymgmt.genctx =
evp_keymgmt_gen_init(ctx->keymgmt,
OSSL_KEYMGMT_SELECT_ALL_PARAMETERS);
break;
case EVP_PKEY_OP_KEYGEN:
ctx->op.keymgmt.genctx =
evp_keymgmt_gen_init(ctx->keymgmt, OSSL_KEYMGMT_SELECT_KEYPAIR);
break;
}
if (ctx->op.keymgmt.genctx == NULL)
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
else
ret = 1;
goto end;
legacy:
#ifdef FIPS_MODULE
goto not_supported;
#else
if (ctx->pmeth == NULL
|| (operation == EVP_PKEY_OP_PARAMGEN
&& ctx->pmeth->paramgen == NULL)
|| (operation == EVP_PKEY_OP_KEYGEN
&& ctx->pmeth->keygen == NULL))
goto not_supported;
ret = 1;
switch (operation) {
case EVP_PKEY_OP_PARAMGEN:
if (ctx->pmeth->paramgen_init != NULL)
ret = ctx->pmeth->paramgen_init(ctx);
break;
case EVP_PKEY_OP_KEYGEN:
if (ctx->pmeth->keygen_init != NULL)
ret = ctx->pmeth->keygen_init(ctx);
break;
}
#endif
end:
if (ret <= 0 && ctx != NULL) {
evp_pkey_ctx_free_old_ops(ctx);
ctx->operation = EVP_PKEY_OP_UNDEFINED;
}
return ret;
not_supported:
ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
ret = -2;
goto end;
}
int EVP_PKEY_paramgen_init(EVP_PKEY_CTX *ctx)
{
return gen_init(ctx, EVP_PKEY_OP_PARAMGEN);
}
int EVP_PKEY_keygen_init(EVP_PKEY_CTX *ctx)
{
return gen_init(ctx, EVP_PKEY_OP_KEYGEN);
}
static int ossl_callback_to_pkey_gencb(const OSSL_PARAM params[], void *arg)
{
EVP_PKEY_CTX *ctx = arg;
const OSSL_PARAM *param = NULL;
int p = -1, n = -1;
if (ctx->pkey_gencb == NULL)
return 1; /* No callback? That's fine */
if ((param = OSSL_PARAM_locate_const(params, OSSL_GEN_PARAM_POTENTIAL))
== NULL
|| !OSSL_PARAM_get_int(param, &p))
return 0;
if ((param = OSSL_PARAM_locate_const(params, OSSL_GEN_PARAM_ITERATION))
== NULL
|| !OSSL_PARAM_get_int(param, &n))
return 0;
ctx->keygen_info[0] = p;
ctx->keygen_info[1] = n;
return ctx->pkey_gencb(ctx);
}
int EVP_PKEY_gen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey)
{
int ret = 0;
OSSL_CALLBACK cb;
EVP_PKEY *allocated_pkey = NULL;
/* Legacy compatible keygen callback info, only used with provider impls */
int gentmp[2];
if (ppkey == NULL)
return -1;
if (ctx == NULL)
goto not_supported;
if ((ctx->operation & EVP_PKEY_OP_TYPE_GEN) == 0)
goto not_initialized;
if (*ppkey == NULL)
*ppkey = allocated_pkey = EVP_PKEY_new();
if (*ppkey == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
return -1;
}
if (ctx->op.keymgmt.genctx == NULL)
goto legacy;
/*
* Asssigning gentmp to ctx->keygen_info is something our legacy
* implementations do. Because the provider implementations aren't
* allowed to reach into our EVP_PKEY_CTX, we need to provide similar
* space for backward compatibility. It's ok that we attach a local
* variable, as it should only be useful in the calls down from here.
* This is cleared as soon as it isn't useful any more, i.e. directly
* after the evp_keymgmt_util_gen() call.
*/
ctx->keygen_info = gentmp;
ctx->keygen_info_count = 2;
ret = 1;
if (ctx->pkey != NULL) {
EVP_KEYMGMT *tmp_keymgmt = ctx->keymgmt;
void *keydata =
evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
&tmp_keymgmt, ctx->propquery);
if (tmp_keymgmt == NULL)
goto not_supported;
/*
* It's ok if keydata is NULL here. The backend is expected to deal
* with that as it sees fit.
*/
ret = evp_keymgmt_gen_set_template(ctx->keymgmt,
ctx->op.keymgmt.genctx, keydata);
}
/*
* the returned value from evp_keymgmt_util_gen() is cached in *ppkey,
* so we so not need to save it, just check it.
*/
ret = ret
&& (evp_keymgmt_util_gen(*ppkey, ctx->keymgmt, ctx->op.keymgmt.genctx,
ossl_callback_to_pkey_gencb, ctx)
!= NULL);
ctx->keygen_info = NULL;
#ifndef FIPS_MODULE
/* In case |*ppkey| was originally a legacy key */
if (ret)
evp_pkey_free_legacy(*ppkey);
#endif
/*
* Because we still have legacy keys, and evp_pkey_downgrade()
* TODO remove this #legacy internal keys are gone
*/
(*ppkey)->type = ctx->legacy_keytype;
/* TODO remove when SM2 key have been cleanly separated from EC keys */
#ifdef TMP_SM2_HACK
/*
* Legacy SM2 keys are implemented as EC_KEY with a twist. The legacy
* key generation detects the SM2 curve and "magically" changes the pkey
* id accordingly.
* Since we don't have SM2 in the provider implementation, we need to
* downgrade the generated provider side key to a legacy one under the
* same conditions.
*
* THIS IS AN UGLY BUT TEMPORARY HACK
*/
{
char curve_name[OSSL_MAX_NAME_SIZE] = "";
if (!EVP_PKEY_get_utf8_string_param(*ppkey, OSSL_PKEY_PARAM_GROUP_NAME,
curve_name, sizeof(curve_name),
NULL)
|| strcmp(curve_name, "SM2") != 0)
goto end;
}
if (!evp_pkey_downgrade(*ppkey)
|| !EVP_PKEY_set_alias_type(*ppkey, EVP_PKEY_SM2))
ret = 0;
#endif
goto end;
legacy:
#ifdef FIPS_MODULE
goto not_supported;
#else
if (ctx->pkey && !evp_pkey_downgrade(ctx->pkey))
goto not_accessible;
switch (ctx->operation) {
case EVP_PKEY_OP_PARAMGEN:
ret = ctx->pmeth->paramgen(ctx, *ppkey);
break;
case EVP_PKEY_OP_KEYGEN:
ret = ctx->pmeth->keygen(ctx, *ppkey);
break;
default:
goto not_supported;
}
#endif
end:
if (ret <= 0) {
if (allocated_pkey != NULL)
*ppkey = NULL;
EVP_PKEY_free(allocated_pkey);
|