[thirdparty/openssl.git] / crypto / evp / exchange.c

/*
 * Copyright 2019 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 <openssl/crypto.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include "internal/refcount.h"
#include "crypto/evp.h"
#include "internal/provider.h"
#include "internal/numbers.h"   /* includes SIZE_MAX */
#include "evp_local.h"

static EVP_KEYEXCH *evp_keyexch_new(OSSL_PROVIDER *prov)
{
    EVP_KEYEXCH *exchange = OPENSSL_zalloc(sizeof(EVP_KEYEXCH));

    if (exchange == NULL) {
        ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
        return NULL;
    }

    exchange->lock = CRYPTO_THREAD_lock_new();
    if (exchange->lock == NULL) {
        ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
        OPENSSL_free(exchange);
        return NULL;
    }
    exchange->prov = prov;
    ossl_provider_up_ref(prov);
    exchange->refcnt = 1;

    return exchange;
}

static void *evp_keyexch_from_dispatch(int name_id,
                                       const OSSL_DISPATCH *fns,
                                       OSSL_PROVIDER *prov)
{
    EVP_KEYEXCH *exchange = NULL;
    int fncnt = 0, paramfncnt = 0;

    if ((exchange = evp_keyexch_new(prov)) == NULL) {
        ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
        goto err;
    }

    exchange->name_id = name_id;

    for (; fns->function_id != 0; fns++) {
        switch (fns->function_id) {
        case OSSL_FUNC_KEYEXCH_NEWCTX:
            if (exchange->newctx != NULL)
                break;
            exchange->newctx = OSSL_get_OP_keyexch_newctx(fns);
            fncnt++;
            break;
        case OSSL_FUNC_KEYEXCH_INIT:
            if (exchange->init != NULL)
                break;
            exchange->init = OSSL_get_OP_keyexch_init(fns);
            fncnt++;
            break;
        case OSSL_FUNC_KEYEXCH_SET_PEER:
            if (exchange->set_peer != NULL)
                break;
            exchange->set_peer = OSSL_get_OP_keyexch_set_peer(fns);
            break;
        case OSSL_FUNC_KEYEXCH_DERIVE:
            if (exchange->derive != NULL)
                break;
            exchange->derive = OSSL_get_OP_keyexch_derive(fns);
            fncnt++;
            break;
        case OSSL_FUNC_KEYEXCH_FREECTX:
            if (exchange->freectx != NULL)
                break;
            exchange->freectx = OSSL_get_OP_keyexch_freectx(fns);
            fncnt++;
            break;
        case OSSL_FUNC_KEYEXCH_DUPCTX:
            if (exchange->dupctx != NULL)
                break;
            exchange->dupctx = OSSL_get_OP_keyexch_dupctx(fns);
            break;
        case OSSL_FUNC_KEYEXCH_SET_CTX_PARAMS:
            if (exchange->set_ctx_params != NULL)
                break;
            exchange->set_ctx_params = OSSL_get_OP_keyexch_set_ctx_params(fns);
            paramfncnt++;
            break;
        case OSSL_FUNC_KEYEXCH_SETTABLE_CTX_PARAMS:
            if (exchange->settable_ctx_params != NULL)
                break;
            exchange->settable_ctx_params
                = OSSL_get_OP_keyexch_settable_ctx_params(fns);
            paramfncnt++;
            break;
        }
    }
    if (fncnt != 4 || (paramfncnt != 0 && paramfncnt != 2)) {
        /*
         * In order to be a consistent set of functions we must have at least
         * a complete set of "exchange" functions: init, derive, newctx,
         * and freectx. The set_ctx_params and settable_ctx_params functions are
         * optional, but if one of them is present then the other one must also
         * be present. The dupctx and set_peer functions are optional.
         */
        EVPerr(EVP_F_EVP_KEYEXCH_FROM_DISPATCH,
               EVP_R_INVALID_PROVIDER_FUNCTIONS);
        goto err;
    }

    return exchange;

 err:
    EVP_KEYEXCH_free(exchange);
    return NULL;
}

void EVP_KEYEXCH_free(EVP_KEYEXCH *exchange)
{
    if (exchange != NULL) {
        int i;

        CRYPTO_DOWN_REF(&exchange->refcnt, &i, exchange->lock);
        if (i > 0)
            return;
        ossl_provider_free(exchange->prov);
        CRYPTO_THREAD_lock_free(exchange->lock);
        OPENSSL_free(exchange);
    }
}

int EVP_KEYEXCH_up_ref(EVP_KEYEXCH *exchange)
{
    int ref = 0;

    CRYPTO_UP_REF(&exchange->refcnt, &ref, exchange->lock);
    return 1;
}

OSSL_PROVIDER *EVP_KEYEXCH_provider(const EVP_KEYEXCH *exchange)
{
    return exchange->prov;
}

EVP_KEYEXCH *EVP_KEYEXCH_fetch(OPENSSL_CTX *ctx, const char *algorithm,
                               const char *properties)
{
    return evp_generic_fetch(ctx, OSSL_OP_KEYEXCH, algorithm, properties,
                             evp_keyexch_from_dispatch,
                             (int (*)(void *))EVP_KEYEXCH_up_ref,
                             (void (*)(void *))EVP_KEYEXCH_free);
}

int EVP_PKEY_derive_init(EVP_PKEY_CTX *ctx)
{
    int ret;
    void *provkey = NULL;
    EVP_KEYEXCH *exchange = NULL;
    EVP_KEYMGMT *tmp_keymgmt = NULL;
    const char *supported_exch = NULL;

    if (ctx == NULL) {
        EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
        return -2;
    }

    evp_pkey_ctx_free_old_ops(ctx);
    ctx->operation = EVP_PKEY_OP_DERIVE;

    /*
     * TODO when we stop falling back to legacy, this and the ERR_pop_to_mark()
     * calls can be removed.
     */
    ERR_set_mark();

    if (ctx->engine != NULL || ctx->keytype == NULL)
        goto legacy;

    /* Ensure that the key is provided.  If not, go legacy */
    tmp_keymgmt = ctx->keymgmt;
    provkey = evp_pkey_make_provided(ctx->pkey, ctx->libctx,
                                     &tmp_keymgmt, ctx->propquery, 0);
    if (provkey == NULL)
        goto legacy;
    if (!EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
        ERR_clear_last_mark();
        ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
        goto err;
    }
    EVP_KEYMGMT_free(ctx->keymgmt);
    ctx->keymgmt = tmp_keymgmt;

    if (ctx->keymgmt->query_operation_name != NULL)
        supported_exch = ctx->keymgmt->query_operation_name(OSSL_OP_KEYEXCH);

    /*
     * If we didn't get a supported exch, assume there is one with the
     * same name as the key type.
     */
    if (supported_exch == NULL)
        supported_exch = ctx->keytype;

    /*
     * Because we cleared out old ops, we shouldn't need to worry about
     * checking if exchange is already there.
     */
    exchange = EVP_KEYEXCH_fetch(ctx->libctx, supported_exch, ctx->propquery);

    if (exchange == NULL
        || (EVP_KEYMGMT_provider(ctx->keymgmt)
            != EVP_KEYEXCH_provider(exchange))) {
        /*
         * We don't need to free ctx->keymgmt here, as it's not necessarily
         * tied to this operation.  It will be freed by EVP_PKEY_CTX_free().
         */
        EVP_KEYEXCH_free(exchange);
        goto legacy;
    }

    /*
     * TODO remove this when legacy is gone
     * If we don't have the full support we need with provided methods,
     * let's go see if legacy does.
     */
    ERR_pop_to_mark();

    /* No more legacy from here down to legacy: */

    ctx->op.kex.exchange = exchange;
    ctx->op.kex.exchprovctx = exchange->newctx(ossl_provider_ctx(exchange->prov));
    if (ctx->op.kex.exchprovctx == NULL) {
        /* The provider key can stay in the cache */
        EVPerr(0, EVP_R_INITIALIZATION_ERROR);
        goto err;
    }
    ret = exchange->init(ctx->op.kex.exchprovctx, provkey);

    return ret ? 1 : 0;
 err:
    ctx->operation = EVP_PKEY_OP_UNDEFINED;
    return 0;

 legacy:
    /*
     * TODO remove this when legacy is gone
     * If we don't have the full support we need with provided methods,
     * let's go see if legacy does.
     */
    ERR_pop_to_mark();

#ifdef FIPS_MODE
    return 0;
#else
    if (ctx->pmeth == NULL || ctx->pmeth->derive == NULL) {
        EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
        return -2;
    }

    if (ctx->pmeth->derive_init == NULL)
        return 1;
    ret = ctx->pmeth->derive_init(ctx);
    if (ret <= 0)
        ctx->operation = EVP_PKEY_OP_UNDEFINED;
    return ret;
#endif
}

int EVP_PKEY_derive_set_peer(EVP_PKEY_CTX *ctx, EVP_PKEY *peer)
{
    int ret = 0;
    void *provkey = NULL;

    if (ctx == NULL) {
        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
        return -2;
    }

    if (!EVP_PKEY_CTX_IS_DERIVE_OP(ctx) || ctx->op.kex.exchprovctx == NULL)
        goto legacy;

    if (ctx->op.kex.exchange->set_peer == NULL) {
        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
        return -2;
    }

    provkey = evp_keymgmt_export_to_provider(peer, ctx->keymgmt, 0);
    /* If export failed, legacy may be able to pick it up */
    if (provkey == NULL)
        goto legacy;
    return ctx->op.kex.exchange->set_peer(ctx->op.kex.exchprovctx, provkey);

 legacy:
#ifdef FIPS_MODE
    return ret;
#else
    if (ctx->pmeth == NULL
        || !(ctx->pmeth->derive != NULL
             || ctx->pmeth->encrypt != NULL
             || ctx->pmeth->decrypt != NULL)
        || ctx->pmeth->ctrl == NULL) {
        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
        return -2;
    }
    if (ctx->operation != EVP_PKEY_OP_DERIVE
        && ctx->operation != EVP_PKEY_OP_ENCRYPT
        && ctx->operation != EVP_PKEY_OP_DECRYPT) {
        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
               EVP_R_OPERATON_NOT_INITIALIZED);
        return -1;
    }

    ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 0, peer);

    if (ret <= 0)
        return ret;

    if (ret == 2)
        return 1;

    if (ctx->pkey == NULL) {
        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_NO_KEY_SET);
        return -1;
    }

    if (ctx->pkey->type != peer->type) {
        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_DIFFERENT_KEY_TYPES);
        return -1;
    }

    /*
     * For clarity.  The error is if parameters in peer are
     * present (!missing) but don't match.  EVP_PKEY_cmp_parameters may return
     * 1 (match), 0 (don't match) and -2 (comparison is not defined).  -1
     * (different key types) is impossible here because it is checked earlier.
     * -2 is OK for us here, as well as 1, so we can check for 0 only.
     */
    if (!EVP_PKEY_missing_parameters(peer) &&
        !EVP_PKEY_cmp_parameters(ctx->pkey, peer)) {
        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_DIFFERENT_PARAMETERS);
        return -1;
    }

    EVP_PKEY_free(ctx->peerkey);
    ctx->peerkey = peer;

    ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 1, peer);

    if (ret <= 0) {
        ctx->peerkey = NULL;
        return ret;
    }

    EVP_PKEY_up_ref(peer);
    return 1;
#endif
}

int EVP_PKEY_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *pkeylen)
{
    int ret;

    if (ctx == NULL) {
        EVPerr(EVP_F_EVP_PKEY_DERIVE,
               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
        return -2;
    }

    if (!EVP_PKEY_CTX_IS_DERIVE_OP(ctx)) {
        EVPerr(EVP_F_EVP_PKEY_DERIVE, EVP_R_OPERATON_NOT_INITIALIZED);
        return -1;
    }

    if (ctx->op.kex.exchprovctx == NULL)
        goto legacy;

    ret = ctx->op.kex.exchange->derive(ctx->op.kex.exchprovctx, key, pkeylen,
                                       SIZE_MAX);

    return ret;
 legacy:
    if (ctx ==  NULL || ctx->pmeth == NULL || ctx->pmeth->derive == NULL) {
        EVPerr(EVP_F_EVP_PKEY_DERIVE,
               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
        return -2;
    }

    M_check_autoarg(ctx, key, pkeylen, EVP_F_EVP_PKEY_DERIVE)
        return ctx->pmeth->derive(ctx, key, pkeylen);
}

int EVP_KEYEXCH_number(const EVP_KEYEXCH *keyexch)
{
    return keyexch->name_id;
}

int EVP_KEYEXCH_is_a(const EVP_KEYEXCH *keyexch, const char *name)
{
    return evp_is_a(keyexch->prov, keyexch->name_id, NULL, name);
}

void EVP_KEYEXCH_do_all_provided(OPENSSL_CTX *libctx,
                                 void (*fn)(EVP_KEYEXCH *keyexch, void *arg),
                                 void *arg)
{
    evp_generic_do_all(libctx, OSSL_OP_KEYEXCH,
                       (void (*)(void *, void *))fn, arg,
                       evp_keyexch_from_dispatch,
                       (void (*)(void *))EVP_KEYEXCH_free);
}

void EVP_KEYEXCH_names_do_all(const EVP_KEYEXCH *keyexch,
                              void (*fn)(const char *name, void *data),
                              void *data)
{
    if (keyexch->prov != NULL)
        evp_names_do_all(keyexch->prov, keyexch->name_id, fn, data);
}
Commit	Line	Data
ff64702b MC	1	/*
	2	* Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
	3	*
	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
	8	*/
	9
	10	#include <openssl/crypto.h>
	11	#include <openssl/evp.h>
	12	#include <openssl/err.h>
	13	#include "internal/refcount.h"
25f2138b	14	#include "crypto/evp.h"
ff64702b	15	#include "internal/provider.h"
ac5a61ca	16	#include "internal/numbers.h" /* includes SIZE_MAX */
706457b7	17	#include "evp_local.h"
ff64702b MC	18
	19	static EVP_KEYEXCH evp_keyexch_new(OSSL_PROVIDER prov)
	20	{
	21	EVP_KEYEXCH *exchange = OPENSSL_zalloc(sizeof(EVP_KEYEXCH));
	22
c1ff5994 MC	23	if (exchange == NULL) {
	24	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
	25	return NULL;
	26	}
	27
ff64702b MC	28	exchange->lock = CRYPTO_THREAD_lock_new();
ff64702b MC	29	if (exchange->lock == NULL) {
c1ff5994	30	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
ff64702b MC	31	OPENSSL_free(exchange);
	32	return NULL;
	33	}
	34	exchange->prov = prov;
	35	ossl_provider_up_ref(prov);
	36	exchange->refcnt = 1;
	37
	38	return exchange;
	39	}
	40
f7c16d48	41	static void *evp_keyexch_from_dispatch(int name_id,
6b9e3724	42	const OSSL_DISPATCH *fns,
0ddf74bf	43	OSSL_PROVIDER *prov)
ff64702b MC	44	{
ff64702b MC	45	EVP_KEYEXCH *exchange = NULL;
9c45222d	46	int fncnt = 0, paramfncnt = 0;
ff64702b	47
f7c16d48	48	if ((exchange = evp_keyexch_new(prov)) == NULL) {
3ca9d210 RL	49	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
3ca9d210 RL	50	goto err;
6b9e3724	51	}
ff64702b	52
f7c16d48	53	exchange->name_id = name_id;
3ca9d210	54
ff64702b MC	55	for (; fns->function_id != 0; fns++) {
	56	switch (fns->function_id) {
	57	case OSSL_FUNC_KEYEXCH_NEWCTX:
	58	if (exchange->newctx != NULL)
	59	break;
	60	exchange->newctx = OSSL_get_OP_keyexch_newctx(fns);
	61	fncnt++;
	62	break;
	63	case OSSL_FUNC_KEYEXCH_INIT:
	64	if (exchange->init != NULL)
	65	break;
	66	exchange->init = OSSL_get_OP_keyexch_init(fns);
	67	fncnt++;
	68	break;
	69	case OSSL_FUNC_KEYEXCH_SET_PEER:
	70	if (exchange->set_peer != NULL)
	71	break;
	72	exchange->set_peer = OSSL_get_OP_keyexch_set_peer(fns);
	73	break;
	74	case OSSL_FUNC_KEYEXCH_DERIVE:
	75	if (exchange->derive != NULL)
	76	break;
	77	exchange->derive = OSSL_get_OP_keyexch_derive(fns);
	78	fncnt++;
	79	break;
	80	case OSSL_FUNC_KEYEXCH_FREECTX:
	81	if (exchange->freectx != NULL)
	82	break;
	83	exchange->freectx = OSSL_get_OP_keyexch_freectx(fns);
	84	fncnt++;
	85	break;
	86	case OSSL_FUNC_KEYEXCH_DUPCTX:
	87	if (exchange->dupctx != NULL)
	88	break;
	89	exchange->dupctx = OSSL_get_OP_keyexch_dupctx(fns);
	90	break;
9c45222d MC	91	case OSSL_FUNC_KEYEXCH_SET_CTX_PARAMS:
9c45222d MC	92	if (exchange->set_ctx_params != NULL)
35aca9ec	93	break;
9c45222d MC	94	exchange->set_ctx_params = OSSL_get_OP_keyexch_set_ctx_params(fns);
	95	paramfncnt++;
	96	break;
	97	case OSSL_FUNC_KEYEXCH_SETTABLE_CTX_PARAMS:
	98	if (exchange->settable_ctx_params != NULL)
	99	break;
	100	exchange->settable_ctx_params
	101	= OSSL_get_OP_keyexch_settable_ctx_params(fns);
	102	paramfncnt++;
35aca9ec	103	break;
ff64702b MC	104	}
ff64702b MC	105	}
9c45222d	106	if (fncnt != 4 \|\| (paramfncnt != 0 && paramfncnt != 2)) {
ff64702b MC	107	/*
	108	* In order to be a consistent set of functions we must have at least
	109	* a complete set of "exchange" functions: init, derive, newctx,
9c45222d MC	110	* and freectx. The set_ctx_params and settable_ctx_params functions are
	111	* optional, but if one of them is present then the other one must also
	112	* be present. The dupctx and set_peer functions are optional.
ff64702b	113	*/
ff64702b MC	114	EVPerr(EVP_F_EVP_KEYEXCH_FROM_DISPATCH,
ff64702b MC	115	EVP_R_INVALID_PROVIDER_FUNCTIONS);
3ca9d210	116	goto err;
ff64702b MC	117	}
	118
	119	return exchange;
3ca9d210 RL	120
	121	err:
	122	EVP_KEYEXCH_free(exchange);
3ca9d210	123	return NULL;
ff64702b MC	124	}
	125
	126	void EVP_KEYEXCH_free(EVP_KEYEXCH *exchange)
	127	{
	128	if (exchange != NULL) {
	129	int i;
	130
	131	CRYPTO_DOWN_REF(&exchange->refcnt, &i, exchange->lock);
	132	if (i > 0)
	133	return;
	134	ossl_provider_free(exchange->prov);
	135	CRYPTO_THREAD_lock_free(exchange->lock);
	136	OPENSSL_free(exchange);
	137	}
	138	}
	139
	140	int EVP_KEYEXCH_up_ref(EVP_KEYEXCH *exchange)
	141	{
	142	int ref = 0;
	143
	144	CRYPTO_UP_REF(&exchange->refcnt, &ref, exchange->lock);
	145	return 1;
	146	}
	147
8b84b075 RL	148	OSSL_PROVIDER EVP_KEYEXCH_provider(const EVP_KEYEXCH exchange)
	149	{
	150	return exchange->prov;
	151	}
	152
ff64702b MC	153	EVP_KEYEXCH EVP_KEYEXCH_fetch(OPENSSL_CTX ctx, const char *algorithm,
	154	const char *properties)
	155	{
0ddf74bf RL	156	return evp_generic_fetch(ctx, OSSL_OP_KEYEXCH, algorithm, properties,
	157	evp_keyexch_from_dispatch,
	158	(int ()(void ))EVP_KEYEXCH_up_ref,
	159	(void ()(void ))EVP_KEYEXCH_free);
ff64702b MC	160	}
ff64702b MC	161
c0e0984f	162	int EVP_PKEY_derive_init(EVP_PKEY_CTX *ctx)
ff64702b MC	163	{
ff64702b MC	164	int ret;
8b84b075	165	void *provkey = NULL;
c0e0984f	166	EVP_KEYEXCH *exchange = NULL;
f6aa5774 RL	167	EVP_KEYMGMT *tmp_keymgmt = NULL;
f6aa5774 RL	168	const char *supported_exch = NULL;
c0e0984f RL	169
	170	if (ctx == NULL) {
	171	EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	172	return -2;
	173	}
ff64702b	174
864b89ce	175	evp_pkey_ctx_free_old_ops(ctx);
ff64702b MC	176	ctx->operation = EVP_PKEY_OP_DERIVE;
ff64702b MC	177
0b9dd384 RL	178	/*
	179	* TODO when we stop falling back to legacy, this and the ERR_pop_to_mark()
	180	* calls can be removed.
	181	*/
	182	ERR_set_mark();
	183
f23bc0b7	184	if (ctx->engine != NULL \|\| ctx->keytype == NULL)
ff64702b MC	185	goto legacy;
ff64702b MC	186
f6aa5774 RL	187	/* Ensure that the key is provided. If not, go legacy */
	188	tmp_keymgmt = ctx->keymgmt;
	189	provkey = evp_pkey_make_provided(ctx->pkey, ctx->libctx,
	190	&tmp_keymgmt, ctx->propquery, 0);
	191	if (provkey == NULL)
	192	goto legacy;
	193	if (!EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
0b9dd384	194	ERR_clear_last_mark();
f6aa5774 RL	195	ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
f6aa5774 RL	196	goto err;
c0e0984f	197	}
f6aa5774 RL	198	EVP_KEYMGMT_free(ctx->keymgmt);
	199	ctx->keymgmt = tmp_keymgmt;
	200
	201	if (ctx->keymgmt->query_operation_name != NULL)
	202	supported_exch = ctx->keymgmt->query_operation_name(OSSL_OP_KEYEXCH);
	203
	204	/*
	205	* If we didn't get a supported exch, assume there is one with the
	206	* same name as the key type.
	207	*/
	208	if (supported_exch == NULL)
	209	supported_exch = ctx->keytype;
	210
	211	/*
	212	* Because we cleared out old ops, we shouldn't need to worry about
	213	* checking if exchange is already there.
	214	*/
	215	exchange = EVP_KEYEXCH_fetch(ctx->libctx, supported_exch, ctx->propquery);
	216
	217	if (exchange == NULL
c0e0984f RL	218	\|\| (EVP_KEYMGMT_provider(ctx->keymgmt)
c0e0984f RL	219	!= EVP_KEYEXCH_provider(exchange))) {
ff64702b	220	/*
0b9dd384 RL	221	* We don't need to free ctx->keymgmt here, as it's not necessarily
0b9dd384 RL	222	* tied to this operation. It will be freed by EVP_PKEY_CTX_free().
ff64702b	223	*/
c0e0984f RL	224	EVP_KEYEXCH_free(exchange);
c0e0984f RL	225	goto legacy;
ff64702b MC	226	}
ff64702b MC	227
0b9dd384 RL	228	/*
	229	* TODO remove this when legacy is gone
	230	* If we don't have the full support we need with provided methods,
	231	* let's go see if legacy does.
	232	*/
	233	ERR_pop_to_mark();
	234
	235	/* No more legacy from here down to legacy: */
c0e0984f	236
864b89ce	237	ctx->op.kex.exchange = exchange;
864b89ce MC	238	ctx->op.kex.exchprovctx = exchange->newctx(ossl_provider_ctx(exchange->prov));
864b89ce MC	239	if (ctx->op.kex.exchprovctx == NULL) {
8b84b075	240	/* The provider key can stay in the cache */
c0e0984f	241	EVPerr(0, EVP_R_INITIALIZATION_ERROR);
ff64702b MC	242	goto err;
ff64702b MC	243	}
864b89ce	244	ret = exchange->init(ctx->op.kex.exchprovctx, provkey);
ff64702b MC	245
	246	return ret ? 1 : 0;
	247	err:
	248	ctx->operation = EVP_PKEY_OP_UNDEFINED;
	249	return 0;
	250
	251	legacy:
0b9dd384 RL	252	/*
	253	* TODO remove this when legacy is gone
	254	* If we don't have the full support we need with provided methods,
	255	* let's go see if legacy does.
	256	*/
	257	ERR_pop_to_mark();
	258
62f49b90 SL	259	#ifdef FIPS_MODE
	260	return 0;
	261	#else
e0d8523e	262	if (ctx->pmeth == NULL \|\| ctx->pmeth->derive == NULL) {
c0e0984f	263	EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
ff64702b MC	264	return -2;
	265	}
	266
	267	if (ctx->pmeth->derive_init == NULL)
	268	return 1;
	269	ret = ctx->pmeth->derive_init(ctx);
	270	if (ret <= 0)
	271	ctx->operation = EVP_PKEY_OP_UNDEFINED;
	272	return ret;
62f49b90	273	#endif
ff64702b MC	274	}
ff64702b MC	275
ff64702b MC	276	int EVP_PKEY_derive_set_peer(EVP_PKEY_CTX ctx, EVP_PKEY peer)
ff64702b MC	277	{
62f49b90	278	int ret = 0;
8b84b075	279	void *provkey = NULL;
ff64702b MC	280
	281	if (ctx == NULL) {
	282	EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
	283	EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	284	return -2;
	285	}
	286
864b89ce	287	if (!EVP_PKEY_CTX_IS_DERIVE_OP(ctx) \|\| ctx->op.kex.exchprovctx == NULL)
ff64702b MC	288	goto legacy;
ff64702b MC	289
864b89ce	290	if (ctx->op.kex.exchange->set_peer == NULL) {
ff64702b MC	291	EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
	292	EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	293	return -2;
	294	}
	295
c0e0984f	296	provkey = evp_keymgmt_export_to_provider(peer, ctx->keymgmt, 0);
e0d8523e RL	297	/* If export failed, legacy may be able to pick it up */
	298	if (provkey == NULL)
	299	goto legacy;
864b89ce	300	return ctx->op.kex.exchange->set_peer(ctx->op.kex.exchprovctx, provkey);
ff64702b MC	301
ff64702b MC	302	legacy:
62f49b90 SL	303	#ifdef FIPS_MODE
	304	return ret;
	305	#else
ff64702b MC	306	if (ctx->pmeth == NULL
	307	\|\| !(ctx->pmeth->derive != NULL
	308	\|\| ctx->pmeth->encrypt != NULL
	309	\|\| ctx->pmeth->decrypt != NULL)
	310	\|\| ctx->pmeth->ctrl == NULL) {
	311	EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
	312	EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	313	return -2;
	314	}
	315	if (ctx->operation != EVP_PKEY_OP_DERIVE
	316	&& ctx->operation != EVP_PKEY_OP_ENCRYPT
	317	&& ctx->operation != EVP_PKEY_OP_DECRYPT) {
	318	EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
	319	EVP_R_OPERATON_NOT_INITIALIZED);
	320	return -1;
	321	}
	322
	323	ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 0, peer);
	324
	325	if (ret <= 0)
	326	return ret;
	327
	328	if (ret == 2)
	329	return 1;
	330
	331	if (ctx->pkey == NULL) {
	332	EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_NO_KEY_SET);
	333	return -1;
	334	}
	335
	336	if (ctx->pkey->type != peer->type) {
	337	EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_DIFFERENT_KEY_TYPES);
	338	return -1;
	339	}
	340
	341	/*
	342	* For clarity. The error is if parameters in peer are
	343	* present (!missing) but don't match. EVP_PKEY_cmp_parameters may return
	344	* 1 (match), 0 (don't match) and -2 (comparison is not defined). -1
	345	* (different key types) is impossible here because it is checked earlier.
	346	* -2 is OK for us here, as well as 1, so we can check for 0 only.
	347	*/
	348	if (!EVP_PKEY_missing_parameters(peer) &&
	349	!EVP_PKEY_cmp_parameters(ctx->pkey, peer)) {
	350	EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_DIFFERENT_PARAMETERS);
	351	return -1;
	352	}
	353
	354	EVP_PKEY_free(ctx->peerkey);
	355	ctx->peerkey = peer;
	356
	357	ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 1, peer);
	358
	359	if (ret <= 0) {
	360	ctx->peerkey = NULL;
	361	return ret;
	362	}
	363
	364	EVP_PKEY_up_ref(peer);
	365	return 1;
62f49b90	366	#endif
ff64702b MC	367	}
	368
	369	int EVP_PKEY_derive(EVP_PKEY_CTX ctx, unsigned char key, size_t *pkeylen)
	370	{
	371	int ret;
	372
	373	if (ctx == NULL) {
	374	EVPerr(EVP_F_EVP_PKEY_DERIVE,
	375	EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	376	return -2;
	377	}
	378
864b89ce	379	if (!EVP_PKEY_CTX_IS_DERIVE_OP(ctx)) {
ff64702b MC	380	EVPerr(EVP_F_EVP_PKEY_DERIVE, EVP_R_OPERATON_NOT_INITIALIZED);
	381	return -1;
	382	}
	383
864b89ce	384	if (ctx->op.kex.exchprovctx == NULL)
ff64702b MC	385	goto legacy;
ff64702b MC	386
864b89ce MC	387	ret = ctx->op.kex.exchange->derive(ctx->op.kex.exchprovctx, key, pkeylen,
864b89ce MC	388	SIZE_MAX);
ff64702b MC	389
	390	return ret;
	391	legacy:
	392	if (ctx == NULL \|\| ctx->pmeth == NULL \|\| ctx->pmeth->derive == NULL) {
	393	EVPerr(EVP_F_EVP_PKEY_DERIVE,
	394	EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	395	return -2;
	396	}
	397
	398	M_check_autoarg(ctx, key, pkeylen, EVP_F_EVP_PKEY_DERIVE)
	399	return ctx->pmeth->derive(ctx, key, pkeylen);
	400	}
251e610c	401
506cb0f6 RL	402	int EVP_KEYEXCH_number(const EVP_KEYEXCH *keyexch)
	403	{
	404	return keyexch->name_id;
	405	}
	406
251e610c RL	407	int EVP_KEYEXCH_is_a(const EVP_KEYEXCH keyexch, const char name)
251e610c RL	408	{
e4a1d023	409	return evp_is_a(keyexch->prov, keyexch->name_id, NULL, name);
251e610c RL	410	}
	411
	412	void EVP_KEYEXCH_do_all_provided(OPENSSL_CTX *libctx,
	413	void (fn)(EVP_KEYEXCH keyexch, void *arg),
	414	void *arg)
	415	{
251e610c RL	416	evp_generic_do_all(libctx, OSSL_OP_KEYEXCH,
251e610c RL	417	(void ()(void , void *))fn, arg,
0ddf74bf	418	evp_keyexch_from_dispatch,
251e610c RL	419	(void ()(void ))EVP_KEYEXCH_free);
251e610c RL	420	}
f651c727 RL	421
	422	void EVP_KEYEXCH_names_do_all(const EVP_KEYEXCH *keyexch,
	423	void (fn)(const char name, void *data),
	424	void *data)
	425	{
	426	if (keyexch->prov != NULL)
	427	evp_names_do_all(keyexch->prov, keyexch->name_id, fn, data);
	428	}