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

/*
 * Copyright 2020-2021 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/objects.h>
#include <openssl/evp.h>
#include "internal/cryptlib.h"
#include "internal/provider.h"
#include "internal/core.h"
#include "crypto/evp.h"
#include "evp_local.h"

static int evp_kem_init(EVP_PKEY_CTX *ctx, int operation,
                        const OSSL_PARAM params[])
{
    int ret = 0;
    EVP_KEM *kem = NULL;
    EVP_KEYMGMT *tmp_keymgmt = NULL;
    void *provkey = NULL;
    const char *supported_kem = NULL;

    if (ctx == NULL || ctx->keytype == NULL) {
        ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
        return 0;
    }

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

    /*
     * Ensure that the key is provided, either natively, or as a cached export.
     */
    tmp_keymgmt = ctx->keymgmt;
    provkey = evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
                                          &tmp_keymgmt, ctx->propquery);
    if (provkey == NULL
        || !EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
        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_kem = ctx->keymgmt->query_operation_name(OSSL_OP_KEM);

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

    kem = EVP_KEM_fetch(ctx->libctx, supported_kem, ctx->propquery);
    if (kem == NULL
        || (EVP_KEYMGMT_provider(ctx->keymgmt) != EVP_KEM_provider(kem))) {
        ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
        ret = -2;
        goto err;
    }

    ctx->op.encap.kem = kem;
    ctx->op.encap.kemprovctx = kem->newctx(ossl_provider_ctx(kem->prov));
    if (ctx->op.encap.kemprovctx == NULL) {
        /* The provider key can stay in the cache */
        ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
        goto err;
    }

    switch (operation) {
    case EVP_PKEY_OP_ENCAPSULATE:
        if (kem->encapsulate_init == NULL) {
            ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
            ret = -2;
            goto err;
        }
        ret = kem->encapsulate_init(ctx->op.encap.kemprovctx, provkey, params);
        break;
    case EVP_PKEY_OP_DECAPSULATE:
        if (kem->decapsulate_init == NULL) {
            ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
            ret = -2;
            goto err;
        }
        ret = kem->decapsulate_init(ctx->op.encap.kemprovctx, provkey, params);
        break;
    default:
        ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
        goto err;
    }

    if (ret > 0)
        return 1;
 err:
    if (ret <= 0) {
        evp_pkey_ctx_free_old_ops(ctx);
        ctx->operation = EVP_PKEY_OP_UNDEFINED;
    }
    return ret;
}

int EVP_PKEY_encapsulate_init(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[])
{
    return evp_kem_init(ctx, EVP_PKEY_OP_ENCAPSULATE, params);
}

int EVP_PKEY_encapsulate(EVP_PKEY_CTX *ctx,
                         unsigned char *out, size_t *outlen,
                         unsigned char *secret, size_t *secretlen)
{
    if (ctx == NULL)
        return 0;

    if (ctx->operation != EVP_PKEY_OP_ENCAPSULATE) {
        ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
        return -1;
    }

    if (ctx->op.encap.kemprovctx == NULL) {
        ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
        return -2;
    }

    if (out != NULL && secret == NULL)
        return 0;

    return ctx->op.encap.kem->encapsulate(ctx->op.encap.kemprovctx,
                                          out, outlen, secret, secretlen);
}

int EVP_PKEY_decapsulate_init(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[])
{
    return evp_kem_init(ctx, EVP_PKEY_OP_DECAPSULATE, params);
}

int EVP_PKEY_decapsulate(EVP_PKEY_CTX *ctx,
                         unsigned char *secret, size_t *secretlen,
                         const unsigned char *in, size_t inlen)
{
    if (ctx == NULL
        || (in == NULL || inlen == 0)
        || (secret == NULL && secretlen == NULL))
        return 0;

    if (ctx->operation != EVP_PKEY_OP_DECAPSULATE) {
        ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
        return -1;
    }

    if (ctx->op.encap.kemprovctx == NULL) {
        ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
        return -2;
    }
    return ctx->op.encap.kem->decapsulate(ctx->op.encap.kemprovctx,
                                          secret, secretlen, in, inlen);
}

static EVP_KEM *evp_kem_new(OSSL_PROVIDER *prov)
{
    EVP_KEM *kem = OPENSSL_zalloc(sizeof(EVP_KEM));

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

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

    return kem;
}

static void *evp_kem_from_algorithm(int name_id, const OSSL_ALGORITHM *algodef,
                                    OSSL_PROVIDER *prov)
{
    const OSSL_DISPATCH *fns = algodef->implementation;
    EVP_KEM *kem = NULL;
    int ctxfncnt = 0, encfncnt = 0, decfncnt = 0;
    int gparamfncnt = 0, sparamfncnt = 0;

    if ((kem = evp_kem_new(prov)) == NULL) {
        ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
        goto err;
    }

    kem->name_id = name_id;
    if ((kem->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL)
        goto err;
    kem->description = algodef->algorithm_description;

    for (; fns->function_id != 0; fns++) {
        switch (fns->function_id) {
        case OSSL_FUNC_KEM_NEWCTX:
            if (kem->newctx != NULL)
                break;
            kem->newctx = OSSL_FUNC_kem_newctx(fns);
            ctxfncnt++;
            break;
        case OSSL_FUNC_KEM_ENCAPSULATE_INIT:
            if (kem->encapsulate_init != NULL)
                break;
            kem->encapsulate_init = OSSL_FUNC_kem_encapsulate_init(fns);
            encfncnt++;
            break;
        case OSSL_FUNC_KEM_ENCAPSULATE:
            if (kem->encapsulate != NULL)
                break;
            kem->encapsulate = OSSL_FUNC_kem_encapsulate(fns);
            encfncnt++;
            break;
        case OSSL_FUNC_KEM_DECAPSULATE_INIT:
            if (kem->decapsulate_init != NULL)
                break;
            kem->decapsulate_init = OSSL_FUNC_kem_decapsulate_init(fns);
            decfncnt++;
            break;
        case OSSL_FUNC_KEM_DECAPSULATE:
            if (kem->decapsulate != NULL)
                break;
            kem->decapsulate = OSSL_FUNC_kem_decapsulate(fns);
            decfncnt++;
            break;
        case OSSL_FUNC_KEM_FREECTX:
            if (kem->freectx != NULL)
                break;
            kem->freectx = OSSL_FUNC_kem_freectx(fns);
            ctxfncnt++;
            break;
        case OSSL_FUNC_KEM_DUPCTX:
            if (kem->dupctx != NULL)
                break;
            kem->dupctx = OSSL_FUNC_kem_dupctx(fns);
            break;
        case OSSL_FUNC_KEM_GET_CTX_PARAMS:
            if (kem->get_ctx_params != NULL)
                break;
            kem->get_ctx_params
                = OSSL_FUNC_kem_get_ctx_params(fns);
            gparamfncnt++;
            break;
        case OSSL_FUNC_KEM_GETTABLE_CTX_PARAMS:
            if (kem->gettable_ctx_params != NULL)
                break;
            kem->gettable_ctx_params
                = OSSL_FUNC_kem_gettable_ctx_params(fns);
            gparamfncnt++;
            break;
        case OSSL_FUNC_KEM_SET_CTX_PARAMS:
            if (kem->set_ctx_params != NULL)
                break;
            kem->set_ctx_params
                = OSSL_FUNC_kem_set_ctx_params(fns);
            sparamfncnt++;
            break;
        case OSSL_FUNC_KEM_SETTABLE_CTX_PARAMS:
            if (kem->settable_ctx_params != NULL)
                break;
            kem->settable_ctx_params
                = OSSL_FUNC_kem_settable_ctx_params(fns);
            sparamfncnt++;
            break;
        }
    }
    if (ctxfncnt != 2
        || (encfncnt != 0 && encfncnt != 2)
        || (decfncnt != 0 && decfncnt != 2)
        || (encfncnt != 2 && decfncnt != 2)
        || (gparamfncnt != 0 && gparamfncnt != 2)
        || (sparamfncnt != 0 && sparamfncnt != 2)) {
        /*
         * In order to be a consistent set of functions we must have at least
         * a set of context functions (newctx and freectx) as well as a pair of
         * "kem" functions: (encapsulate_init, encapsulate) or
         * (decapsulate_init, decapsulate). set_ctx_params and settable_ctx_params are
         * optional, but if one of them is present then the other one must also
         * be present. The same applies to get_ctx_params and
         * gettable_ctx_params. The dupctx function is optional.
         */
        ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
        goto err;
    }

    return kem;
 err:
    EVP_KEM_free(kem);
    return NULL;
}

void EVP_KEM_free(EVP_KEM *kem)
{
    int i;

    if (kem == NULL)
        return;

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

int EVP_KEM_up_ref(EVP_KEM *kem)
{
    int ref = 0;

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

OSSL_PROVIDER *EVP_KEM_provider(const EVP_KEM *kem)
{
    return kem->prov;
}

EVP_KEM *EVP_KEM_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
                       const char *properties)
{
    return evp_generic_fetch(ctx, OSSL_OP_KEM, algorithm, properties,
                             evp_kem_from_algorithm,
                             (int (*)(void *))EVP_KEM_up_ref,
                             (void (*)(void *))EVP_KEM_free);
}

int EVP_KEM_is_a(const EVP_KEM *kem, const char *name)
{
    return evp_is_a(kem->prov, kem->name_id, NULL, name);
}

int EVP_KEM_number(const EVP_KEM *kem)
{
    return kem->name_id;
}

const char *EVP_KEM_name(const EVP_KEM *kem)
{
    return kem->type_name;
}

const char *EVP_KEM_description(const EVP_KEM *kem)
{
    return kem->description;
}

void EVP_KEM_do_all_provided(OSSL_LIB_CTX *libctx,
                             void (*fn)(EVP_KEM *kem, void *arg),
                             void *arg)
{
    evp_generic_do_all(libctx, OSSL_OP_KEM, (void (*)(void *, void *))fn, arg,
                       evp_kem_from_algorithm,
                       (void (*)(void *))EVP_KEM_free);
}

int EVP_KEM_names_do_all(const EVP_KEM *kem,
                         void (*fn)(const char *name, void *data),
                         void *data)
{
    if (kem->prov != NULL)
        return evp_names_do_all(kem->prov, kem->name_id, fn, data);

    return 1;
}

const OSSL_PARAM *EVP_KEM_gettable_ctx_params(const EVP_KEM *kem)
{
    void *provctx;

    if (kem == NULL || kem->gettable_ctx_params == NULL)
        return NULL;

    provctx = ossl_provider_ctx(EVP_KEM_provider(kem));
    return kem->gettable_ctx_params(NULL, provctx);
}

const OSSL_PARAM *EVP_KEM_settable_ctx_params(const EVP_KEM *kem)
{
    void *provctx;

    if (kem == NULL || kem->settable_ctx_params == NULL)
        return NULL;

    provctx = ossl_provider_ctx(EVP_KEM_provider(kem));
    return kem->settable_ctx_params(NULL, provctx);
}
Commit	Line	Data
80f4fd18	1	/*
8020d79b	2	* Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
80f4fd18 SL	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 <stdio.h>
	11	#include <stdlib.h>
	12	#include <openssl/objects.h>
	13	#include <openssl/evp.h>
	14	#include "internal/cryptlib.h"
80f4fd18	15	#include "internal/provider.h"
6c9bc258 TM	16	#include "internal/core.h"
6c9bc258 TM	17	#include "crypto/evp.h"
80f4fd18 SL	18	#include "evp_local.h"
80f4fd18 SL	19
4b58d9b4 P	20	static int evp_kem_init(EVP_PKEY_CTX *ctx, int operation,
4b58d9b4 P	21	const OSSL_PARAM params[])
80f4fd18 SL	22	{
	23	int ret = 0;
	24	EVP_KEM *kem = NULL;
	25	EVP_KEYMGMT *tmp_keymgmt = NULL;
	26	void *provkey = NULL;
	27	const char *supported_kem = NULL;
	28
	29	if (ctx == NULL \|\| ctx->keytype == NULL) {
	30	ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
	31	return 0;
	32	}
	33
	34	evp_pkey_ctx_free_old_ops(ctx);
	35	ctx->operation = operation;
	36
	37	/*
	38	* Ensure that the key is provided, either natively, or as a cached export.
	39	*/
	40	tmp_keymgmt = ctx->keymgmt;
	41	provkey = evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
	42	&tmp_keymgmt, ctx->propquery);
	43	if (provkey == NULL
	44	\|\| !EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
	45	ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
	46	goto err;
	47	}
	48	EVP_KEYMGMT_free(ctx->keymgmt);
	49	ctx->keymgmt = tmp_keymgmt;
	50
	51	if (ctx->keymgmt->query_operation_name != NULL)
	52	supported_kem = ctx->keymgmt->query_operation_name(OSSL_OP_KEM);
	53
	54	/*
	55	* If we didn't get a supported kem, assume there is one with the
	56	* same name as the key type.
	57	*/
	58	if (supported_kem == NULL)
	59	supported_kem = ctx->keytype;
	60
	61	kem = EVP_KEM_fetch(ctx->libctx, supported_kem, ctx->propquery);
	62	if (kem == NULL
	63	\|\| (EVP_KEYMGMT_provider(ctx->keymgmt) != EVP_KEM_provider(kem))) {
	64	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	65	ret = -2;
	66	goto err;
	67	}
	68
	69	ctx->op.encap.kem = kem;
	70	ctx->op.encap.kemprovctx = kem->newctx(ossl_provider_ctx(kem->prov));
	71	if (ctx->op.encap.kemprovctx == NULL) {
	72	/* The provider key can stay in the cache */
	73	ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
	74	goto err;
	75	}
	76
	77	switch (operation) {
	78	case EVP_PKEY_OP_ENCAPSULATE:
	79	if (kem->encapsulate_init == NULL) {
	80	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	81	ret = -2;
	82	goto err;
	83	}
4b58d9b4	84	ret = kem->encapsulate_init(ctx->op.encap.kemprovctx, provkey, params);
80f4fd18 SL	85	break;
	86	case EVP_PKEY_OP_DECAPSULATE:
	87	if (kem->decapsulate_init == NULL) {
	88	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	89	ret = -2;
	90	goto err;
	91	}
4b58d9b4	92	ret = kem->decapsulate_init(ctx->op.encap.kemprovctx, provkey, params);
80f4fd18 SL	93	break;
	94	default:
	95	ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
	96	goto err;
	97	}
	98
	99	if (ret > 0)
	100	return 1;
	101	err:
	102	if (ret <= 0) {
	103	evp_pkey_ctx_free_old_ops(ctx);
	104	ctx->operation = EVP_PKEY_OP_UNDEFINED;
	105	}
	106	return ret;
	107	}
	108
4b58d9b4	109	int EVP_PKEY_encapsulate_init(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[])
80f4fd18	110	{
4b58d9b4	111	return evp_kem_init(ctx, EVP_PKEY_OP_ENCAPSULATE, params);
80f4fd18 SL	112	}
	113
	114	int EVP_PKEY_encapsulate(EVP_PKEY_CTX *ctx,
	115	unsigned char out, size_t outlen,
	116	unsigned char secret, size_t secretlen)
	117	{
	118	if (ctx == NULL)
	119	return 0;
	120
	121	if (ctx->operation != EVP_PKEY_OP_ENCAPSULATE) {
bf23b9a1	122	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
80f4fd18 SL	123	return -1;
	124	}
	125
	126	if (ctx->op.encap.kemprovctx == NULL) {
9311d0c4	127	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
80f4fd18 SL	128	return -2;
	129	}
	130
	131	if (out != NULL && secret == NULL)
	132	return 0;
	133
	134	return ctx->op.encap.kem->encapsulate(ctx->op.encap.kemprovctx,
	135	out, outlen, secret, secretlen);
	136	}
	137
4b58d9b4	138	int EVP_PKEY_decapsulate_init(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[])
80f4fd18	139	{
4b58d9b4	140	return evp_kem_init(ctx, EVP_PKEY_OP_DECAPSULATE, params);
80f4fd18 SL	141	}
	142
	143	int EVP_PKEY_decapsulate(EVP_PKEY_CTX *ctx,
	144	unsigned char secret, size_t secretlen,
	145	const unsigned char *in, size_t inlen)
	146	{
	147	if (ctx == NULL
	148	\|\| (in == NULL \|\| inlen == 0)
	149	\|\| (secret == NULL && secretlen == NULL))
	150	return 0;
	151
	152	if (ctx->operation != EVP_PKEY_OP_DECAPSULATE) {
bf23b9a1	153	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
80f4fd18 SL	154	return -1;
	155	}
	156
	157	if (ctx->op.encap.kemprovctx == NULL) {
9311d0c4	158	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
80f4fd18 SL	159	return -2;
	160	}
	161	return ctx->op.encap.kem->decapsulate(ctx->op.encap.kemprovctx,
	162	secret, secretlen, in, inlen);
	163	}
	164
	165	static EVP_KEM evp_kem_new(OSSL_PROVIDER prov)
	166	{
	167	EVP_KEM *kem = OPENSSL_zalloc(sizeof(EVP_KEM));
	168
	169	if (kem == NULL) {
	170	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
	171	return NULL;
	172	}
	173
	174	kem->lock = CRYPTO_THREAD_lock_new();
	175	if (kem->lock == NULL) {
	176	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
	177	OPENSSL_free(kem);
	178	return NULL;
	179	}
	180	kem->prov = prov;
	181	ossl_provider_up_ref(prov);
	182	kem->refcnt = 1;
	183
	184	return kem;
	185	}
	186
309a78aa RL	187	static void evp_kem_from_algorithm(int name_id, const OSSL_ALGORITHM algodef,
309a78aa RL	188	OSSL_PROVIDER *prov)
80f4fd18	189	{
309a78aa	190	const OSSL_DISPATCH *fns = algodef->implementation;
80f4fd18 SL	191	EVP_KEM *kem = NULL;
	192	int ctxfncnt = 0, encfncnt = 0, decfncnt = 0;
	193	int gparamfncnt = 0, sparamfncnt = 0;
	194
	195	if ((kem = evp_kem_new(prov)) == NULL) {
	196	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
	197	goto err;
	198	}
	199
	200	kem->name_id = name_id;
6c9bc258 TM	201	if ((kem->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL)
6c9bc258 TM	202	goto err;
309a78aa	203	kem->description = algodef->algorithm_description;
80f4fd18 SL	204
	205	for (; fns->function_id != 0; fns++) {
	206	switch (fns->function_id) {
	207	case OSSL_FUNC_KEM_NEWCTX:
	208	if (kem->newctx != NULL)
	209	break;
	210	kem->newctx = OSSL_FUNC_kem_newctx(fns);
	211	ctxfncnt++;
	212	break;
	213	case OSSL_FUNC_KEM_ENCAPSULATE_INIT:
	214	if (kem->encapsulate_init != NULL)
	215	break;
	216	kem->encapsulate_init = OSSL_FUNC_kem_encapsulate_init(fns);
	217	encfncnt++;
	218	break;
	219	case OSSL_FUNC_KEM_ENCAPSULATE:
	220	if (kem->encapsulate != NULL)
	221	break;
	222	kem->encapsulate = OSSL_FUNC_kem_encapsulate(fns);
	223	encfncnt++;
	224	break;
	225	case OSSL_FUNC_KEM_DECAPSULATE_INIT:
	226	if (kem->decapsulate_init != NULL)
	227	break;
	228	kem->decapsulate_init = OSSL_FUNC_kem_decapsulate_init(fns);
	229	decfncnt++;
	230	break;
	231	case OSSL_FUNC_KEM_DECAPSULATE:
	232	if (kem->decapsulate != NULL)
	233	break;
	234	kem->decapsulate = OSSL_FUNC_kem_decapsulate(fns);
	235	decfncnt++;
	236	break;
	237	case OSSL_FUNC_KEM_FREECTX:
	238	if (kem->freectx != NULL)
	239	break;
	240	kem->freectx = OSSL_FUNC_kem_freectx(fns);
	241	ctxfncnt++;
	242	break;
	243	case OSSL_FUNC_KEM_DUPCTX:
	244	if (kem->dupctx != NULL)
	245	break;
	246	kem->dupctx = OSSL_FUNC_kem_dupctx(fns);
	247	break;
	248	case OSSL_FUNC_KEM_GET_CTX_PARAMS:
	249	if (kem->get_ctx_params != NULL)
	250	break;
	251	kem->get_ctx_params
	252	= OSSL_FUNC_kem_get_ctx_params(fns);
	253	gparamfncnt++;
	254	break;
	255	case OSSL_FUNC_KEM_GETTABLE_CTX_PARAMS:
	256	if (kem->gettable_ctx_params != NULL)
	257	break;
	258	kem->gettable_ctx_params
	259	= OSSL_FUNC_kem_gettable_ctx_params(fns);
	260	gparamfncnt++;
	261	break;
	262	case OSSL_FUNC_KEM_SET_CTX_PARAMS:
	263	if (kem->set_ctx_params != NULL)
	264	break;
	265	kem->set_ctx_params
	266	= OSSL_FUNC_kem_set_ctx_params(fns);
	267	sparamfncnt++;
268	break;
269	case OSSL_FUNC_KEM_SETTABLE_CTX_PARAMS:
270	if (kem->settable_ctx_params != NULL)
271	break;
272	kem->settable_ctx_params
273	= OSSL_FUNC_kem_settable_ctx_params(fns);
274	sparamfncnt++;
275	break;
276	}
277	}
278	if (ctxfncnt != 2
279	\|\| (encfncnt != 0 && encfncnt != 2)
280	\|\| (decfncnt != 0 && decfncnt != 2)
281	\|\| (encfncnt != 2 && decfncnt != 2)
282	\|\| (gparamfncnt != 0 && gparamfncnt != 2)
283	\|\| (sparamfncnt != 0 && sparamfncnt != 2)) {
284	/*
285	* In order to be a consistent set of functions we must have at least
286	* a set of context functions (newctx and freectx) as well as a pair of
287	* "kem" functions: (encapsulate_init, encapsulate) or
288	* (decapsulate_init, decapsulate). set_ctx_params and settable_ctx_params are
289	* optional, but if one of them is present then the other one must also
290	* be present. The same applies to get_ctx_params and
291	* gettable_ctx_params. The dupctx function is optional.
292	*/
293	ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
294	goto err;
295	}
296
297	return kem;
298	err:
299	EVP_KEM_free(kem);
300	return NULL;
301	}
302
303	void EVP_KEM_free(EVP_KEM *kem)
304	{
543e740b RS	305	int i;
	306
	307	if (kem == NULL)
	308	return;
	309
	310	CRYPTO_DOWN_REF(&kem->refcnt, &i, kem->lock);
	311	if (i > 0)
	312	return;
6c9bc258	313	OPENSSL_free(kem->type_name);
543e740b RS	314	ossl_provider_free(kem->prov);
	315	CRYPTO_THREAD_lock_free(kem->lock);
	316	OPENSSL_free(kem);
80f4fd18 SL	317	}
	318
	319	int EVP_KEM_up_ref(EVP_KEM *kem)
	320	{
	321	int ref = 0;
	322
	323	CRYPTO_UP_REF(&kem->refcnt, &ref, kem->lock);
	324	return 1;
	325	}
	326
	327	OSSL_PROVIDER EVP_KEM_provider(const EVP_KEM kem)
	328	{
	329	return kem->prov;
	330	}
	331
b4250010	332	EVP_KEM EVP_KEM_fetch(OSSL_LIB_CTX ctx, const char *algorithm,
80f4fd18 SL	333	const char *properties)
	334	{
	335	return evp_generic_fetch(ctx, OSSL_OP_KEM, algorithm, properties,
309a78aa	336	evp_kem_from_algorithm,
80f4fd18 SL	337	(int ()(void ))EVP_KEM_up_ref,
	338	(void ()(void ))EVP_KEM_free);
	339	}
	340
	341	int EVP_KEM_is_a(const EVP_KEM kem, const char name)
	342	{
	343	return evp_is_a(kem->prov, kem->name_id, NULL, name);
	344	}
	345
	346	int EVP_KEM_number(const EVP_KEM *kem)
	347	{
	348	return kem->name_id;
	349	}
	350
6c9bc258 TM	351	const char EVP_KEM_name(const EVP_KEM kem)
	352	{
	353	return kem->type_name;
	354	}
	355
03888233 RL	356	const char EVP_KEM_description(const EVP_KEM kem)
	357	{
	358	return kem->description;
	359	}
	360
b4250010	361	void EVP_KEM_do_all_provided(OSSL_LIB_CTX *libctx,
80f4fd18 SL	362	void (fn)(EVP_KEM kem, void *arg),
	363	void *arg)
	364	{
	365	evp_generic_do_all(libctx, OSSL_OP_KEM, (void ()(void , void *))fn, arg,
309a78aa	366	evp_kem_from_algorithm,
80f4fd18 SL	367	(void ()(void ))EVP_KEM_free);
	368	}
	369
d84f5515 MC	370	int EVP_KEM_names_do_all(const EVP_KEM *kem,
	371	void (fn)(const char name, void *data),
	372	void *data)
80f4fd18 SL	373	{
80f4fd18 SL	374	if (kem->prov != NULL)
d84f5515 MC	375	return evp_names_do_all(kem->prov, kem->name_id, fn, data);
	376
	377	return 1;
80f4fd18	378	}
5a950048 SL	379
	380	const OSSL_PARAM EVP_KEM_gettable_ctx_params(const EVP_KEM kem)
	381	{
	382	void *provctx;
	383
	384	if (kem == NULL \|\| kem->gettable_ctx_params == NULL)
	385	return NULL;
	386
	387	provctx = ossl_provider_ctx(EVP_KEM_provider(kem));
fb67126e	388	return kem->gettable_ctx_params(NULL, provctx);
5a950048 SL	389	}
	390
	391	const OSSL_PARAM EVP_KEM_settable_ctx_params(const EVP_KEM kem)
	392	{
	393	void *provctx;
	394
	395	if (kem == NULL \|\| kem->settable_ctx_params == NULL)
	396	return NULL;
	397
	398	provctx = ossl_provider_ctx(EVP_KEM_provider(kem));
fb67126e	399	return kem->settable_ctx_params(NULL, provctx);
5a950048	400	}