/*

 * Copyright 2024-2025 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/core_dispatch.h>

#include <openssl/core_names.h>

#include <openssl/params.h>

#include <openssl/err.h>

#include <openssl/proverr.h>

#include <openssl/provider.h>

#include <openssl/rand.h>

#include <openssl/self_test.h>

#include <openssl/param_build.h>

#include <openssl/cms.h>

#include "crypto/ml_kem.h"

#include "internal/fips.h"

#include "internal/param_build_set.h"

#include "internal/sizes.h"

#include "prov/der_hkdf.h"

#include "prov/der_wrap.h"

#include "prov/implementations.h"

#include "prov/providercommon.h"

#include "prov/provider_ctx.h"

#include "prov/securitycheck.h"

#include "prov/ml_kem.h"

#include "providers/implementations/keymgmt/ml_kem_kmgmt.inc"

static OSSL_FUNC_keymgmt_new_fn ml_kem_512_new;

static OSSL_FUNC_keymgmt_new_fn ml_kem_768_new;

static OSSL_FUNC_keymgmt_new_fn ml_kem_1024_new;

static OSSL_FUNC_keymgmt_gen_fn ml_kem_gen;

static OSSL_FUNC_keymgmt_gen_init_fn ml_kem_512_gen_init;

static OSSL_FUNC_keymgmt_gen_init_fn ml_kem_768_gen_init;

static OSSL_FUNC_keymgmt_gen_init_fn ml_kem_1024_gen_init;

static OSSL_FUNC_keymgmt_gen_cleanup_fn ml_kem_gen_cleanup;

static OSSL_FUNC_keymgmt_gen_set_params_fn ml_kem_gen_set_params;

static OSSL_FUNC_keymgmt_gen_settable_params_fn ml_kem_gen_settable_params;

#ifndef FIPS_MODULE

static OSSL_FUNC_keymgmt_load_fn ml_kem_load;

#endif

static OSSL_FUNC_keymgmt_get_params_fn ml_kem_get_params;

static OSSL_FUNC_keymgmt_gettable_params_fn ml_kem_gettable_params;

static OSSL_FUNC_keymgmt_set_params_fn ml_kem_set_params;

static OSSL_FUNC_keymgmt_settable_params_fn ml_kem_settable_params;

static OSSL_FUNC_keymgmt_has_fn ml_kem_has;

static OSSL_FUNC_keymgmt_match_fn ml_kem_match;

static OSSL_FUNC_keymgmt_validate_fn ml_kem_validate;

static OSSL_FUNC_keymgmt_import_fn ml_kem_import;

static OSSL_FUNC_keymgmt_export_fn ml_kem_export;

static OSSL_FUNC_keymgmt_import_types_fn ml_kem_imexport_types;

static OSSL_FUNC_keymgmt_export_types_fn ml_kem_imexport_types;

static OSSL_FUNC_keymgmt_dup_fn ml_kem_dup;

static const int minimal_selection = OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS

    | OSSL_KEYMGMT_SELECT_PRIVATE_KEY;

typedef struct ml_kem_gen_ctx_st {

    PROV_CTX *provctx;

    char *propq;

    int selection;

    int evp_type;

    uint8_t seedbuf[ML_KEM_SEED_BYTES];

    uint8_t *seed;

} PROV_ML_KEM_GEN_CTX;

static int ml_kem_pairwise_test(const ML_KEM_KEY *key, int key_flags)

{

#ifdef FIPS_MODULE

    OSSL_SELF_TEST *st = NULL;

    OSSL_CALLBACK *cb = NULL;

    void *cbarg = NULL;

#endif

    unsigned char entropy[ML_KEM_RANDOM_BYTES];

    unsigned char secret[ML_KEM_SHARED_SECRET_BYTES];

    unsigned char out[ML_KEM_SHARED_SECRET_BYTES];

    unsigned char *ctext = NULL;

    const ML_KEM_VINFO *v = ossl_ml_kem_key_vinfo(key);

    int operation_result = 0;

    int ret = 0;

    /* Unless we have both a public and private key, we can't do the test */

    if (!ossl_ml_kem_have_prvkey(key)

        || !ossl_ml_kem_have_pubkey(key)

        || (key_flags & ML_KEM_KEY_PCT_TYPE) == 0)

        return 1;

#ifdef FIPS_MODULE

    /* During self test, it is a waste to do this test */

    if (ossl_fips_self_testing())

        return 1;

    /*

     * The functions `OSSL_SELF_TEST_*` will return directly if parameter `st`

     * is NULL.

     */

    OSSL_SELF_TEST_get_callback(key->libctx, &cb, &cbarg);

    st = OSSL_SELF_TEST_new(cb, cbarg);

    if (st == NULL)

        return 0;

    OSSL_SELF_TEST_onbegin(st, OSSL_SELF_TEST_TYPE_PCT,

        OSSL_SELF_TEST_DESC_PCT_ML_KEM);

#endif /* FIPS_MODULE */

    ctext = OPENSSL_malloc(v->ctext_bytes);

    if (ctext == NULL)

        goto err;

    memset(out, 0, sizeof(out));

    /*

     * The pairwise test is skipped unless either RANDOM or FIXED entropy PCTs

     * are enabled.

     */

    if (key_flags & ML_KEM_KEY_RANDOM_PCT) {

        operation_result = ossl_ml_kem_encap_rand(ctext, v->ctext_bytes,

            secret, sizeof(secret), key);

    } else {

        memset(entropy, 0125, sizeof(entropy));

        operation_result = ossl_ml_kem_encap_seed(ctext, v->ctext_bytes,

            secret, sizeof(secret),

            entropy, sizeof(entropy),

            key);

    }

    if (operation_result != 1)

        goto err;

#ifdef FIPS_MODULE

    OSSL_SELF_TEST_oncorrupt_byte(st, ctext);

#endif

    operation_result = ossl_ml_kem_decap(out, sizeof(out), ctext, v->ctext_bytes,

        key);

    if (operation_result != 1 || memcmp(out, secret, sizeof(out)) != 0)

        goto err;

    ret = 1;

err:

#ifdef FIPS_MODULE

    OSSL_SELF_TEST_onend(st, ret);

    OSSL_SELF_TEST_free(st);

#else

    if (ret == 0) {

        ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_KEY,

            "public part of %s private key fails to match private",

            v->algorithm_name);

    }

#endif

    OPENSSL_free(ctext);

    return ret;

}

ML_KEM_KEY *ossl_prov_ml_kem_new(PROV_CTX *ctx, const char *propq, int evp_type)

{

    ML_KEM_KEY *key;

    if (!ossl_prov_is_running())

        return NULL;

    /*

     * When decoding, if the key ends up "loaded" into the same provider, these

     * are the correct config settings, otherwise, new values will be assigned

     * on import into a different provider.  The "load" API does not pass along

     * the provider context.

     */

    if ((key = ossl_ml_kem_key_new(PROV_LIBCTX_OF(ctx), propq, evp_type)) != NULL) {

        const char *pct_type = ossl_prov_ctx_get_param(

            ctx, OSSL_PKEY_PARAM_ML_KEM_IMPORT_PCT_TYPE, "random");

        if (ossl_prov_ctx_get_bool_param(

                ctx, OSSL_PKEY_PARAM_ML_KEM_RETAIN_SEED, 1))

            key->prov_flags |= ML_KEM_KEY_RETAIN_SEED;

        else

            key->prov_flags &= ~ML_KEM_KEY_RETAIN_SEED;

        if (ossl_prov_ctx_get_bool_param(

                ctx, OSSL_PKEY_PARAM_ML_KEM_PREFER_SEED, 1))

            key->prov_flags |= ML_KEM_KEY_PREFER_SEED;

        else

            key->prov_flags &= ~ML_KEM_KEY_PREFER_SEED;

        if (OPENSSL_strcasecmp(pct_type, "random") == 0)

            key->prov_flags |= ML_KEM_KEY_RANDOM_PCT;

        else if (OPENSSL_strcasecmp(pct_type, "fixed") == 0)

            key->prov_flags |= ML_KEM_KEY_FIXED_PCT;

        else

            key->prov_flags &= ~ML_KEM_KEY_PCT_TYPE;

    }

    return key;

}

static int ml_kem_has(const void *vkey, int selection)

{

    const ML_KEM_KEY *key = vkey;

    /* A NULL key MUST fail to have anything */

    if (!ossl_prov_is_running() || key == NULL)

        return 0;

    switch (selection & OSSL_KEYMGMT_SELECT_KEYPAIR) {

    case 0:

        return 1;

    case OSSL_KEYMGMT_SELECT_PUBLIC_KEY:

        return ossl_ml_kem_have_pubkey(key);

    default:

        return ossl_ml_kem_have_prvkey(key);

    }

}

static int ml_kem_match(const void *vkey1, const void *vkey2, int selection)

{

    const ML_KEM_KEY *key1 = vkey1;

    const ML_KEM_KEY *key2 = vkey2;

    if (!ossl_prov_is_running())

        return 0;

    /* All we have that can be compared is key material */

    if (!(selection & OSSL_KEYMGMT_SELECT_KEYPAIR))

        return 1;

    return ossl_ml_kem_pubkey_cmp(key1, key2);

}

static int ml_kem_validate(const void *vkey, int selection, int check_type)

{

    const ML_KEM_KEY *key = vkey;

    if (!ml_kem_has(key, selection))

        return 0;

    if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == OSSL_KEYMGMT_SELECT_KEYPAIR)

        return ml_kem_pairwise_test(key, ML_KEM_KEY_RANDOM_PCT);

    return 1;

}

static int ml_kem_export(void *vkey, int selection, OSSL_CALLBACK *param_cb,

    void *cbarg)

{

    ML_KEM_KEY *key = vkey;

    OSSL_PARAM_BLD *tmpl = NULL;

    OSSL_PARAM *params = NULL;

    const ML_KEM_VINFO *v;

    uint8_t *pubenc = NULL, *prvenc = NULL, *seedenc = NULL;

    size_t prvlen = 0, seedlen = 0;

    int ret = 0;

    if (!ossl_prov_is_running() || key == NULL)

        return 0;

    if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == 0)

        return 0;

    v = ossl_ml_kem_key_vinfo(key);

    if (!ossl_ml_kem_have_pubkey(key)) {

        /* Fail when no key material can be returned */

        if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) == 0

            || !ossl_ml_kem_decoded_key(key)) {

            ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_KEY);

            return 0;

        }

    } else if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {

        pubenc = OPENSSL_malloc(v->pubkey_bytes);

        if (pubenc == NULL

            || !ossl_ml_kem_encode_public_key(pubenc, v->pubkey_bytes, key))

            goto err;

    }

    if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {

        /*

         * The seed and/or private key material are allocated on the secure

         * heap if configured, ossl_param_build_set_octet_string(), will then

         * also use the secure heap.

         */

        if (ossl_ml_kem_have_seed(key)) {

            seedlen = ML_KEM_SEED_BYTES;

            if ((seedenc = OPENSSL_secure_zalloc(seedlen)) == NULL

                || !ossl_ml_kem_encode_seed(seedenc, seedlen, key))

                goto err;

        }

        if (ossl_ml_kem_have_prvkey(key)) {

            prvlen = v->prvkey_bytes;

            if ((prvenc = OPENSSL_secure_zalloc(prvlen)) == NULL

                || !ossl_ml_kem_encode_private_key(prvenc, prvlen, key))

                goto err;

        } else if (ossl_ml_kem_have_dkenc(key)) {

            prvlen = v->prvkey_bytes;

            if ((prvenc = OPENSSL_secure_zalloc(prvlen)) == NULL)

                goto err;

            memcpy(prvenc, key->encoded_dk, prvlen);

        }

    }

    tmpl = OSSL_PARAM_BLD_new();

    if (tmpl == NULL)

        goto err;

    /* The (d, z) seed, when available and private keys are requested. */

    if (seedenc != NULL

        && !ossl_param_build_set_octet_string(

            tmpl, params, OSSL_PKEY_PARAM_ML_KEM_SEED, seedenc, seedlen))

        goto err;

    /* The private key in the FIPS 203 |dk| format, when requested. */

    if (prvenc != NULL

        && !ossl_param_build_set_octet_string(

            tmpl, params, OSSL_PKEY_PARAM_PRIV_KEY, prvenc, prvlen))

        goto err;

    /* The public key on request; it is always available when either is */

    if (pubenc != NULL

        && !ossl_param_build_set_octet_string(

            tmpl, params, OSSL_PKEY_PARAM_PUB_KEY, pubenc, v->pubkey_bytes))

        goto err;

    params = OSSL_PARAM_BLD_to_param(tmpl);

    if (params == NULL)

        goto err;

    ret = param_cb(params, cbarg);

    OSSL_PARAM_clear_free(params);

err:

    OSSL_PARAM_BLD_free(tmpl);

    OPENSSL_secure_clear_free(seedenc, seedlen);

    OPENSSL_secure_clear_free(prvenc, prvlen);

    OPENSSL_free(pubenc);

    return ret;

}

static const OSSL_PARAM *ml_kem_imexport_types(int selection)

{

    if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)

        return ml_kem_key_type_params_list;

    return NULL;

}

static int check_seed(const uint8_t *seed, const uint8_t *prvenc,

    ML_KEM_KEY *key)

{

    size_t zlen = ML_KEM_RANDOM_BYTES;

    if (memcmp(seed + ML_KEM_SEED_BYTES - zlen,

            prvenc + key->vinfo->prvkey_bytes - zlen, zlen)

        == 0)

        return 1;

    ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_KEY,

        "private %s key implicit rejection secret does"

        " not match seed",

        key->vinfo->algorithm_name);

    return 0;

}

static int check_prvenc(const uint8_t *prvenc, ML_KEM_KEY *key)

{

    size_t len = key->vinfo->prvkey_bytes;

    uint8_t *buf = OPENSSL_malloc(len);

    int ret = 0;

    if (buf != NULL

        && ossl_ml_kem_encode_private_key(buf, len, key))

        ret = memcmp(buf, prvenc, len) == 0;

    OPENSSL_clear_free(buf, len);

    if (ret)

        return 1;

    if (buf != NULL)

        ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_KEY,

            "explicit %s private key does not match seed",

            key->vinfo->algorithm_name);

    ossl_ml_kem_key_reset(key);

    return 0;

}

static int ml_kem_key_fromdata(ML_KEM_KEY *key,

    const OSSL_PARAM params[],

    int include_private)

{

    const void *pubenc = NULL, *prvenc = NULL, *seedenc = NULL;

    size_t publen = 0, prvlen = 0, seedlen = 0, puboff;

    const ML_KEM_VINFO *v;

    struct ml_kem_key_type_params_st p;

    /* Invalid attempt to mutate a key, what is the right error to report? */

    if (key == NULL

        || ossl_ml_kem_have_pubkey(key)

        || !ml_kem_key_type_params_decoder(params, &p))

        return 0;

    v = ossl_ml_kem_key_vinfo(key);

    /*

     * When a private key is provided, without a seed, any public key also

     * provided will be ignored (apart from length), just as with the seed.

     */

    if (p.seed != NULL && include_private) {

        /*

         * When a seed is provided, the private and public keys may be ignored,

         * after validating just their lengths.  Comparing encodings or hashes

         * when applicable is possible, but not currently implemented.

         */

        if (OSSL_PARAM_get_octet_string_ptr(p.seed, &seedenc, &seedlen) != 1)

            return 0;

        if (seedlen != 0 && seedlen != ML_KEM_SEED_BYTES) {

            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SEED_LENGTH);

            return 0;

        }

    }

    if (p.privkey != NULL && include_private) {

        if (OSSL_PARAM_get_octet_string_ptr(p.privkey, &prvenc, &prvlen) != 1)

            return 0;

        if (prvlen != 0 && prvlen != v->prvkey_bytes) {

            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);

            return 0;

        }

    }

    /* Used only when no seed or private key is provided. */

    if (p.pubkey != NULL) {

        if (OSSL_PARAM_get_octet_string_ptr(p.pubkey, &pubenc, &publen) != 1)

            return 0;

        if (publen != 0 && publen != v->pubkey_bytes) {

            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);

            return 0;

        }

    }

    /* The caller MUST specify at least one of seed, private or public keys. */

    if (seedlen == 0 && publen == 0 && prvlen == 0) {

        ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_KEY);

        return 0;

    }

    /* Check any explicit public key against embedded value in private key */

    if (publen > 0 && prvlen > 0) {

        /* point to the ek offset in dk = DKpke||ek||H(ek)||z */

        puboff = prvlen - ML_KEM_RANDOM_BYTES - ML_KEM_PKHASH_BYTES - publen;

        if (memcmp(pubenc, (unsigned char *)prvenc + puboff, publen) != 0) {

            ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_KEY,

                "explicit %s public key does not match private",

                v->algorithm_name);

            return 0;

        }

    }

    if (seedlen != 0

        && (prvlen == 0 || (key->prov_flags & ML_KEM_KEY_PREFER_SEED))) {

        if (prvlen != 0 && !check_seed(seedenc, prvenc, key))

            return 0;

        if (!ossl_ml_kem_set_seed(seedenc, seedlen, key)

            || !ossl_ml_kem_genkey(NULL, 0, key))

            return 0;

        return prvlen == 0 || check_prvenc(prvenc, key);

    } else if (prvlen != 0) {

        return ossl_ml_kem_parse_private_key(prvenc, prvlen, key);

    }

    return ossl_ml_kem_parse_public_key(pubenc, publen, key);

}

static int ml_kem_import(void *vkey, int selection, const OSSL_PARAM params[])

{

    ML_KEM_KEY *key = vkey;

    int include_private;

    int res;

    if (!ossl_prov_is_running() || key == NULL)

        return 0;

    if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == 0)

        return 0;

    include_private = selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;

    res = ml_kem_key_fromdata(key, params, include_private);

    if (res > 0 && include_private

        && !ml_kem_pairwise_test(key, key->prov_flags)) {

#ifdef FIPS_MODULE

        ossl_set_error_state(OSSL_SELF_TEST_TYPE_PCT_IMPORT);

#endif

        ossl_ml_kem_key_reset(key);

        res = 0;

    }

    return res;

}

static const OSSL_PARAM *ml_kem_gettable_params(void *provctx)

{

    return ml_kem_get_params_list;

}

#ifndef FIPS_MODULE

static void *ml_kem_load(const void *reference, size_t reference_sz)

{

    ML_KEM_KEY *key = NULL;

    uint8_t *encoded_dk = NULL;

    uint8_t seed[ML_KEM_SEED_BYTES];

    if (ossl_prov_is_running() && reference_sz == sizeof(key)) {

        /* The contents of the reference is the address to our object */

        key = *(ML_KEM_KEY **)reference;

        encoded_dk = key->encoded_dk;

        key->encoded_dk = NULL;

        /* We grabbed, so we detach it */

        *(ML_KEM_KEY **)reference = NULL;

        if (encoded_dk != NULL

            && ossl_ml_kem_encode_seed(seed, sizeof(seed), key)

            && !check_seed(seed, encoded_dk, key))

            goto err;

        /* Generate the key now, if it holds only a stashed seed. */

        if (ossl_ml_kem_have_seed(key)

            && (encoded_dk == NULL

                || (key->prov_flags & ML_KEM_KEY_PREFER_SEED))) {

            if (!ossl_ml_kem_genkey(NULL, 0, key)

                || (encoded_dk != NULL && !check_prvenc(encoded_dk, key)))

                goto err;

        } else if (encoded_dk != NULL) {

            if (!ossl_ml_kem_parse_private_key(encoded_dk,

                    key->vinfo->prvkey_bytes, key)) {

                ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_KEY,

                    "error parsing %s private key",

                    key->vinfo->algorithm_name);

                goto err;

            }

            if (!ml_kem_pairwise_test(key, key->prov_flags))

                goto err;

        }

        OPENSSL_secure_clear_free(encoded_dk, key->vinfo->prvkey_bytes);

        return key;

    }

err:

    if (key != NULL && key->vinfo != NULL)

        OPENSSL_secure_clear_free(encoded_dk, key->vinfo->prvkey_bytes);

    ossl_ml_kem_key_free(key);

    return NULL;

}

#endif

static int ml_kem_get_key_param(const ML_KEM_KEY *key, OSSL_PARAM *p,

    size_t bytes,

    int (*get_f)(uint8_t *out, size_t len,

        const ML_KEM_KEY *key))

{

    if (p->data_type != OSSL_PARAM_OCTET_STRING)

        return 0;

    p->return_size = bytes;

    if (p->data != NULL)

        if (p->data_size < p->return_size

            || !(*get_f)(p->data, p->return_size, key))

            return 0;

    return 1;

}

/*

 * It is assumed the key is guaranteed non-NULL here, and is from this provider

 */

static int ml_kem_get_params(void *vkey, OSSL_PARAM params[])

{

    ML_KEM_KEY *key = vkey;

    const ML_KEM_VINFO *v;

    struct ml_kem_get_params_st p;

    if (key == NULL || !ml_kem_get_params_decoder(params, &p))

        return 0;

    v = ossl_ml_kem_key_vinfo(key);

    if (p.bits != NULL && !OSSL_PARAM_set_size_t(p.bits, v->bits))

        return 0;

    if (p.secbits != NULL && !OSSL_PARAM_set_size_t(p.secbits, v->secbits))

        return 0;

    if (p.maxsize != NULL && !OSSL_PARAM_set_size_t(p.maxsize, v->ctext_bytes))

        return 0;

    if (p.seccat != NULL && !OSSL_PARAM_set_int(p.seccat, v->security_category))

        return 0;

    if (p.pubkey != NULL && ossl_ml_kem_have_pubkey(key)) {

        /* Exported to EVP_PKEY_get_raw_public_key() */

        if (!ml_kem_get_key_param(key, p.pubkey, v->pubkey_bytes,

                &ossl_ml_kem_encode_public_key))

            return 0;

    }

    if (p.encpubkey != NULL && ossl_ml_kem_have_pubkey(key)) {

        /* Needed by EVP_PKEY_get1_encoded_public_key() */

        if (!ml_kem_get_key_param(key, p.encpubkey, v->pubkey_bytes,

                &ossl_ml_kem_encode_public_key))

            return 0;

    }

    if (p.privkey != NULL && ossl_ml_kem_have_prvkey(key)) {

        /* Exported to EVP_PKEY_get_raw_private_key() */

        if (!ml_kem_get_key_param(key, p.privkey, v->prvkey_bytes,

                &ossl_ml_kem_encode_private_key))

            return 0;

    }

    if (p.seed != NULL && ossl_ml_kem_have_seed(key)) {

        /* Exported for import */

        if (!ml_kem_get_key_param(key, p.seed, ML_KEM_SEED_BYTES,

                &ossl_ml_kem_encode_seed))

            return 0;

    }

#ifndef OPENSSL_NO_CMS

    if (p.ri_type != NULL && !OSSL_PARAM_set_int(p.ri_type, CMS_RECIPINFO_KEM))

        return 0;

    if (p.kemri_kdf_alg != NULL) {

        uint8_t aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];

        int ret;

        size_t aid_len = 0;

        WPACKET pkt;

        uint8_t *aid = NULL;

        ret = WPACKET_init_der(&pkt, aid_buf, sizeof(aid_buf));

        ret &= ossl_DER_w_begin_sequence(&pkt, -1)

            && ossl_DER_w_precompiled(&pkt, -1, ossl_der_oid_id_alg_hkdf_with_sha256,

                sizeof(ossl_der_oid_id_alg_hkdf_with_sha256))

            && ossl_DER_w_end_sequence(&pkt, -1);

        if (ret && WPACKET_finish(&pkt)) {

            WPACKET_get_total_written(&pkt, &aid_len);

            aid = WPACKET_get_curr(&pkt);

        }

        WPACKET_cleanup(&pkt);

        if (!ret)

            return 0;

        if (aid != NULL && aid_len != 0 && !OSSL_PARAM_set_octet_string(p.kemri_kdf_alg, aid, aid_len))

            return 0;

    }

#endif

    return 1;

}

static const OSSL_PARAM *ml_kem_settable_params(void *provctx)

{

    return ml_kem_set_params_list;

}

static int ml_kem_set_params(void *vkey, const OSSL_PARAM params[])

{

    ML_KEM_KEY *key = vkey;

    const void *pubenc = NULL;

    size_t publen = 0;

    struct ml_kem_set_params_st p;

    if (key == NULL || !ml_kem_set_params_decoder(params, &p))

        return 0;

    /* Used in TLS via EVP_PKEY_set1_encoded_public_key(). */

    if (p.pub != NULL

        && (OSSL_PARAM_get_octet_string_ptr(p.pub, &pubenc, &publen) != 1

            || publen != key->vinfo->pubkey_bytes)) {

        ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);

        return 0;

    }

    if (publen == 0)

        return 1;

    /* Key mutation is reportedly generally not allowed */

    if (ossl_ml_kem_have_pubkey(key)) {

        ERR_raise_data(ERR_LIB_PROV,

            PROV_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE,

            "ML-KEM keys cannot be mutated");

        return 0;

    }

    return ossl_ml_kem_parse_public_key(pubenc, publen, key);

}

static int ml_kem_gen_set_params(void *vgctx, const OSSL_PARAM params[])

{

    PROV_ML_KEM_GEN_CTX *gctx = vgctx;

    struct ml_kem_gen_set_params_st p;

    if (gctx == NULL || !ml_kem_gen_set_params_decoder(params, &p))

        return 0;

    if (p.propq != NULL) {

        if (p.propq->data_type != OSSL_PARAM_UTF8_STRING)

            return 0;

        OPENSSL_free(gctx->propq);

        if ((gctx->propq = OPENSSL_strdup(p.propq->data)) == NULL)

            return 0;

    }

    if (p.seed != NULL) {

        size_t len = ML_KEM_SEED_BYTES;

        gctx->seed = gctx->seedbuf;

        if (OSSL_PARAM_get_octet_string(p.seed, (void **)&gctx->seed, len, &len)

            && len == ML_KEM_SEED_BYTES)

            return 1;

        /* Possibly, but less likely wrong data type */

        ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SEED_LENGTH);

        gctx->seed = NULL;

        return 0;

    }

    return 1;

}

static void *ml_kem_gen_init(void *provctx, int selection,

    const OSSL_PARAM params[], int evp_type)

{

    PROV_ML_KEM_GEN_CTX *gctx = NULL;

    /*

     * We can only generate private keys, check that the selection is

     * appropriate.

     */

    if (!ossl_prov_is_running()

        || (selection & minimal_selection) == 0

        || (gctx = OPENSSL_zalloc(sizeof(*gctx))) == NULL)

        return NULL;

    gctx->selection = selection;

    gctx->evp_type = evp_type;

    gctx->provctx = provctx;

    if (ml_kem_gen_set_params(gctx, params))

        return gctx;

    ml_kem_gen_cleanup(gctx);

    return NULL;

}

static const OSSL_PARAM *ml_kem_gen_settable_params(ossl_unused void *vgctx,

    ossl_unused void *provctx)

{

    return ml_kem_gen_set_params_list;

}

static void *ml_kem_gen(void *vgctx, OSSL_CALLBACK *osslcb, void *cbarg)

{

    PROV_ML_KEM_GEN_CTX *gctx = vgctx;

    ML_KEM_KEY *key;

    uint8_t *nopub = NULL;

    uint8_t *seed;

    int genok = 0;

    if (gctx == NULL

        || (gctx->selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == OSSL_KEYMGMT_SELECT_PUBLIC_KEY)

        return NULL;

    seed = gctx->seed;

    key = ossl_prov_ml_kem_new(gctx->provctx, gctx->propq, gctx->evp_type);

    if (key == NULL)

        return NULL;

    if ((gctx->selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == 0)

        return key;

    if (seed != NULL && !ossl_ml_kem_set_seed(seed, ML_KEM_SEED_BYTES, key))

        return NULL;

    genok = ossl_ml_kem_genkey(nopub, 0, key);

    /* Erase the single-use seed */

    if (seed != NULL)

        OPENSSL_cleanse(seed, ML_KEM_SEED_BYTES);

    gctx->seed = NULL;

    if (genok) {

#ifdef FIPS_MODULE

        if (!ml_kem_pairwise_test(key, ML_KEM_KEY_FIXED_PCT)) {

            ossl_set_error_state(OSSL_SELF_TEST_TYPE_PCT);

            ossl_ml_kem_key_free(key);

            return NULL;

        }

#endif /* FIPS_MODULE */

        return key;

    }

    ossl_ml_kem_key_free(key);

    return NULL;

}

static void ml_kem_gen_cleanup(void *vgctx)

{

    PROV_ML_KEM_GEN_CTX *gctx = vgctx;

    if (gctx == NULL)

        return;

    if (gctx->seed != NULL)

        OPENSSL_cleanse(gctx->seed, ML_KEM_RANDOM_BYTES);

    OPENSSL_free(gctx->propq);

    OPENSSL_free(gctx);

}

static void *ml_kem_dup(const void *vkey, int selection)

{

    const ML_KEM_KEY *key = vkey;

    if (!ossl_prov_is_running())

        return NULL;

    return ossl_ml_kem_key_dup(key, selection);

}

#ifndef FIPS_MODULE

#define DISPATCH_LOAD_FN \

    { OSSL_FUNC_KEYMGMT_LOAD, (OSSL_FUNC)ml_kem_load },

#else

#define DISPATCH_LOAD_FN /* Non-FIPS only */

#endif

#define DECLARE_VARIANT(bits)                                                             \

    static OSSL_FUNC_keymgmt_new_fn ml_kem_##bits##_new;                                  \

    static OSSL_FUNC_keymgmt_gen_init_fn ml_kem_##bits##_gen_init;                        \

    static void *ml_kem_##bits##_new(void *provctx)                                       \

    {                                                                                     \

        return ossl_prov_ml_kem_new(provctx, NULL, EVP_PKEY_ML_KEM_##bits);               \

    }                                                                                     \

    static void *ml_kem_##bits##_gen_init(void *provctx, int selection,                   \

        const OSSL_PARAM params[])                                                        \

    {                                                                                     \

        return ml_kem_gen_init(provctx, selection, params,                                \

            EVP_PKEY_ML_KEM_##bits);                                                      \

    }                                                                                     \

Unexecuted instantiation: ml_kem_kmgmt.c:ml_kem_512_gen_init

Unexecuted instantiation: ml_kem_kmgmt.c:ml_kem_768_gen_init

Unexecuted instantiation: ml_kem_kmgmt.c:ml_kem_1024_gen_init

    const OSSL_DISPATCH ossl_ml_kem_##bits##_keymgmt_functions[] = {                      \

        { OSSL_FUNC_KEYMGMT_NEW, (OSSL_FUNC)ml_kem_##bits##_new },                        \

        { OSSL_FUNC_KEYMGMT_FREE, (OSSL_FUNC)ossl_ml_kem_key_free },                      \

        { OSSL_FUNC_KEYMGMT_GET_PARAMS, (OSSL_FUNC)ml_kem_get_params },                   \

        { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (OSSL_FUNC)ml_kem_gettable_params },         \

        { OSSL_FUNC_KEYMGMT_SET_PARAMS, (OSSL_FUNC)ml_kem_set_params },                   \

        { OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS, (OSSL_FUNC)ml_kem_settable_params },         \

        { OSSL_FUNC_KEYMGMT_HAS, (OSSL_FUNC)ml_kem_has },                                 \

        { OSSL_FUNC_KEYMGMT_MATCH, (OSSL_FUNC)ml_kem_match },                             \

        { OSSL_FUNC_KEYMGMT_VALIDATE, (OSSL_FUNC)ml_kem_validate },                       \

        { OSSL_FUNC_KEYMGMT_GEN_INIT, (OSSL_FUNC)ml_kem_##bits##_gen_init },              \

        { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (OSSL_FUNC)ml_kem_gen_set_params },           \

        { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS, (OSSL_FUNC)ml_kem_gen_settable_params }, \

        { OSSL_FUNC_KEYMGMT_GEN, (OSSL_FUNC)ml_kem_gen },                                 \

        { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (OSSL_FUNC)ml_kem_gen_cleanup },                 \

        DISPATCH_LOAD_FN { OSSL_FUNC_KEYMGMT_DUP, (OSSL_FUNC)ml_kem_dup },                \

        { OSSL_FUNC_KEYMGMT_IMPORT, (OSSL_FUNC)ml_kem_import },                           \

        { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (OSSL_FUNC)ml_kem_imexport_types },             \

        { OSSL_FUNC_KEYMGMT_EXPORT, (OSSL_FUNC)ml_kem_export },                           \

        { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (OSSL_FUNC)ml_kem_imexport_types },             \

        OSSL_DISPATCH_END                                                                 \

    }

DECLARE_VARIANT(512);

DECLARE_VARIANT(768);

DECLARE_VARIANT(1024);