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

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

static int evp_kem_init(EVP_PKEY_CTX *ctx, int operation)
{
    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);
        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);
        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)
{
    return evp_kem_init(ctx, EVP_PKEY_OP_ENCAPSULATE);
}

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_OPERATON_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)
{
    return evp_kem_init(ctx, EVP_PKEY_OP_DECAPSULATE);
}

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_OPERATON_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_dispatch(int name_id, const OSSL_DISPATCH *fns,
                                   OSSL_PROVIDER *prov)
{
    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;

    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)
{
    if (kem != NULL) {
        int i;

        CRYPTO_DOWN_REF(&kem->refcnt, &i, kem->lock);
        if (i > 0)
            return;
        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_dispatch,
                             (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;
}

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