decode_der2key.c

/*
 * Copyright 2020-2025 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
 */

/*
 * low level APIs are deprecated for public use, but still ok for
 * internal use.
 */
#include "internal/deprecated.h"

#include <openssl/byteorder.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/core_object.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/params.h>
#include <openssl/pem.h> /* PEM_BUFSIZE and public PEM functions */
#include <openssl/pkcs12.h>
#include <openssl/provider.h>
#include <openssl/x509.h>
#include <openssl/proverr.h>
#include <openssl/asn1t.h>
#include "internal/cryptlib.h" /* ossl_assert() */
#include "crypto/dh.h"
#include "crypto/dsa.h"
#include "crypto/ec.h"
#include "crypto/evp.h"
#include "crypto/ecx.h"
#include "crypto/rsa.h"
#include "crypto/ml_dsa.h"
#include "crypto/slh_dsa.h"
#include "crypto/x509.h"
#include "crypto/ml_kem.h"
#include "openssl/obj_mac.h"
#include "prov/bio.h"
#include "prov/implementations.h"
#include "endecoder_local.h"
#include "internal/nelem.h"
#include "ml_dsa_codecs.h"
#include "ml_kem_codecs.h"

#ifndef OPENSSL_NO_SLH_DSA
typedef struct {
    ASN1_OBJECT *oid;
} BARE_ALGOR;

typedef struct {
    BARE_ALGOR algor;
    ASN1_BIT_STRING *pubkey;
} BARE_PUBKEY;

ASN1_SEQUENCE(BARE_ALGOR) = {
    ASN1_SIMPLE(BARE_ALGOR, oid, ASN1_OBJECT),
} static_ASN1_SEQUENCE_END(BARE_ALGOR)

ASN1_SEQUENCE(BARE_PUBKEY) = {
    ASN1_EMBED(BARE_PUBKEY, algor, BARE_ALGOR),
    ASN1_SIMPLE(BARE_PUBKEY, pubkey, ASN1_BIT_STRING)
} static_ASN1_SEQUENCE_END(BARE_PUBKEY)
#endif /* OPENSSL_NO_SLH_DSA */

struct der2key_ctx_st; /* Forward declaration */
typedef int check_key_fn(void *, struct der2key_ctx_st *ctx);
typedef void adjust_key_fn(void *, struct der2key_ctx_st *ctx);
typedef void free_key_fn(void *);
typedef void *d2i_PKCS8_fn(const unsigned char **, long,
    struct der2key_ctx_st *);
typedef void *d2i_PUBKEY_fn(const unsigned char **, long,
    struct der2key_ctx_st *);
struct keytype_desc_st {
    const char *keytype_name;
    const OSSL_DISPATCH *fns; /* Keymgmt (to pilfer functions from) */

    /* The input structure name */
    const char *structure_name;

    /*
     * The EVP_PKEY_xxx type macro.  Should be zero for type specific
     * structures, non-zero when the outermost structure is PKCS#8 or
     * SubjectPublicKeyInfo.  This determines which of the function
     * pointers below will be used.
     */
    int evp_type;

    /* The selection mask for OSSL_FUNC_decoder_does_selection() */
    int selection_mask;

    /* For type specific decoders, we use the corresponding d2i */
    d2i_of_void *d2i_private_key; /* From type-specific DER */
    d2i_of_void *d2i_public_key; /* From type-specific DER */
    d2i_of_void *d2i_key_params; /* From type-specific DER */
    d2i_PKCS8_fn *d2i_PKCS8; /* Wrapped in a PrivateKeyInfo */
    d2i_PUBKEY_fn *d2i_PUBKEY; /* Wrapped in a SubjectPublicKeyInfo */

    /*
     * For any key, we may need to check that the key meets expectations.
     * This is useful when the same functions can decode several variants
     * of a key.
     */
    check_key_fn *check_key;

    /*
     * For any key, we may need to make provider specific adjustments, such
     * as ensure the key carries the correct library context.
     */
    adjust_key_fn *adjust_key;
    /* {type}_free() */
    free_key_fn *free_key;
};

/*
 * Context used for DER to key decoding.
 */
struct der2key_ctx_st {
    PROV_CTX *provctx;
    char propq[OSSL_MAX_PROPQUERY_SIZE];
    const struct keytype_desc_st *desc;
    /* The selection that is passed to der2key_decode() */
    int selection;
    /* Flag used to signal that a failure is fatal */
    unsigned int flag_fatal : 1;
};

typedef void *key_from_pkcs8_t(const PKCS8_PRIV_KEY_INFO *p8inf,
    OSSL_LIB_CTX *libctx, const char *propq);
static void *der2key_decode_p8(const unsigned char **input_der,
    long input_der_len, struct der2key_ctx_st *ctx,
    key_from_pkcs8_t *key_from_pkcs8)
{
    PKCS8_PRIV_KEY_INFO *p8inf = NULL;
    const X509_ALGOR *alg = NULL;
    void *key = NULL;

    if ((p8inf = d2i_PKCS8_PRIV_KEY_INFO(NULL, input_der, input_der_len)) != NULL
        && PKCS8_pkey_get0(NULL, NULL, NULL, &alg, p8inf)
        && (OBJ_obj2nid(alg->algorithm) == ctx->desc->evp_type
            /* Allow decoding sm2 private key with id_ecPublicKey */
            || (OBJ_obj2nid(alg->algorithm) == NID_X9_62_id_ecPublicKey
                && ctx->desc->evp_type == NID_sm2)))
        key = key_from_pkcs8(p8inf, PROV_LIBCTX_OF(ctx->provctx), ctx->propq);
    PKCS8_PRIV_KEY_INFO_free(p8inf);

    return key;
}

/* ---------------------------------------------------------------------- */

static OSSL_FUNC_decoder_freectx_fn der2key_freectx;
static OSSL_FUNC_decoder_decode_fn der2key_decode;
static OSSL_FUNC_decoder_export_object_fn der2key_export_object;
static OSSL_FUNC_decoder_settable_ctx_params_fn der2key_settable_ctx_params;
static OSSL_FUNC_decoder_set_ctx_params_fn der2key_set_ctx_params;

static struct der2key_ctx_st *
der2key_newctx(void *provctx, const struct keytype_desc_st *desc)
{
    struct der2key_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));

    if (ctx != NULL) {
        ctx->provctx = provctx;
        ctx->desc = desc;
    }
    return ctx;
}

static const OSSL_PARAM *der2key_settable_ctx_params(ossl_unused void *provctx)
{
    static const OSSL_PARAM settables[] = {
        OSSL_PARAM_utf8_string(OSSL_DECODER_PARAM_PROPERTIES, NULL, 0),
        OSSL_PARAM_END
    };
    return settables;
}

static int der2key_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
    struct der2key_ctx_st *ctx = vctx;
    const OSSL_PARAM *p;
    char *str = ctx->propq;

    p = OSSL_PARAM_locate_const(params, OSSL_DECODER_PARAM_PROPERTIES);
    if (p != NULL && !OSSL_PARAM_get_utf8_string(p, &str, sizeof(ctx->propq)))
        return 0;

    return 1;
}

static void der2key_freectx(void *vctx)
{
    struct der2key_ctx_st *ctx = vctx;

    OPENSSL_free(ctx);
}

static int der2key_check_selection(int selection,
    const struct keytype_desc_st *desc)
{
    /*
     * The selections are kinda sorta "levels", i.e. each selection given
     * here is assumed to include those following.
     */
    int checks[] = {
        OSSL_KEYMGMT_SELECT_PRIVATE_KEY,
        OSSL_KEYMGMT_SELECT_PUBLIC_KEY,
        OSSL_KEYMGMT_SELECT_ALL_PARAMETERS
    };
    size_t i;

    /* The decoder implementations made here support guessing */
    if (selection == 0)
        return 1;

    for (i = 0; i < OSSL_NELEM(checks); i++) {
        int check1 = (selection & checks[i]) != 0;
        int check2 = (desc->selection_mask & checks[i]) != 0;

        /*
         * If the caller asked for the currently checked bit(s), return
         * whether the decoder description says it's supported.
         */
        if (check1)
            return check2;
    }

    /* This should be dead code, but just to be safe... */
    return 0;
}

static int der2key_decode(void *vctx, OSSL_CORE_BIO *cin, int selection,
    OSSL_CALLBACK *data_cb, void *data_cbarg,
    OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
    struct der2key_ctx_st *ctx = vctx;
    unsigned char *der = NULL;
    const unsigned char *derp;
    long der_len = 0;
    void *key = NULL;
    int ok = 0;

    ctx->selection = selection;
    /*
     * The caller is allowed to specify 0 as a selection mask, to have the
     * structure and key type guessed.  For type-specific structures, this
     * is not recommended, as some structures are very similar.
     * Note that 0 isn't the same as OSSL_KEYMGMT_SELECT_ALL, as the latter
     * signifies a private key structure, where everything else is assumed
     * to be present as well.
     */
    if (selection == 0)
        selection = ctx->desc->selection_mask;
    if ((selection & ctx->desc->selection_mask) == 0) {
        ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);
        return 0;
    }

    ok = ossl_read_der(ctx->provctx, cin, &der, &der_len);
    if (!ok)
        goto next;

    ok = 0; /* Assume that we fail */

    ERR_set_mark();
    if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {
        derp = der;
        if (ctx->desc->d2i_PKCS8 != NULL) {
            key = ctx->desc->d2i_PKCS8(&derp, der_len, ctx);
            if (ctx->flag_fatal) {
                ERR_clear_last_mark();
                goto end;
            }
        } else if (ctx->desc->d2i_private_key != NULL) {
            key = ctx->desc->d2i_private_key(NULL, &derp, der_len);
        }
        if (key == NULL && ctx->selection != 0) {
            ERR_clear_last_mark();
            goto next;
        }
    }
    if (key == NULL && (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
        derp = der;
        if (ctx->desc->d2i_PUBKEY != NULL)
            key = ctx->desc->d2i_PUBKEY(&derp, der_len, ctx);
        else if (ctx->desc->d2i_public_key != NULL)
            key = ctx->desc->d2i_public_key(NULL, &derp, der_len);
        if (key == NULL && ctx->selection != 0) {
            ERR_clear_last_mark();
            goto next;
        }
    }
    if (key == NULL && (selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0) {
        derp = der;
        if (ctx->desc->d2i_key_params != NULL)
            key = ctx->desc->d2i_key_params(NULL, &derp, der_len);
        if (key == NULL && ctx->selection != 0) {
            ERR_clear_last_mark();
            goto next;
        }
    }
    if (key == NULL)
        ERR_clear_last_mark();
    else
        ERR_pop_to_mark();

    /*
     * Last minute check to see if this was the correct type of key.  This
     * should never lead to a fatal error, i.e. the decoding itself was
     * correct, it was just an unexpected key type.  This is generally for
     * classes of key types that have subtle variants, like RSA-PSS keys as
     * opposed to plain RSA keys.
     */
    if (key != NULL
        && ctx->desc->check_key != NULL
        && !ctx->desc->check_key(key, ctx)) {
        ctx->desc->free_key(key);
        key = NULL;
    }

    if (key != NULL && ctx->desc->adjust_key != NULL)
        ctx->desc->adjust_key(key, ctx);

next:
    /*
     * Indicated that we successfully decoded something, or not at all.
     * Ending up "empty handed" is not an error.
     */
    ok = 1;

    /*
     * We free memory here so it's not held up during the callback, because
     * we know the process is recursive and the allocated chunks of memory
     * add up.
     */
    OPENSSL_free(der);
    der = NULL;

    if (key != NULL) {
        OSSL_PARAM params[4];
        int object_type = OSSL_OBJECT_PKEY;

        params[0] = OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE, &object_type);

#ifndef OPENSSL_NO_SM2
        if (strcmp(ctx->desc->keytype_name, "EC") == 0
            && (EC_KEY_get_flags(key) & EC_FLAG_SM2_RANGE) != 0)
            params[1] = OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
                "SM2", 0);
        else
#endif
            params[1] = OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
                (char *)ctx->desc->keytype_name,
                0);
        /* The address of the key becomes the octet string */
        params[2] = OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_REFERENCE,
            &key, sizeof(key));
        params[3] = OSSL_PARAM_construct_end();

        ok = data_cb(params, data_cbarg);
    }

end:
    ctx->desc->free_key(key);
    OPENSSL_free(der);

    return ok;
}

static int der2key_export_object(void *vctx,
    const void *reference, size_t reference_sz,
    OSSL_CALLBACK *export_cb, void *export_cbarg)
{
    struct der2key_ctx_st *ctx = vctx;
    OSSL_FUNC_keymgmt_export_fn *export = ossl_prov_get_keymgmt_export(ctx->desc->fns);
    void *keydata;

    if (reference_sz == sizeof(keydata) && export != NULL) {
        int selection = ctx->selection;

        if (selection == 0)
            selection = OSSL_KEYMGMT_SELECT_ALL;
        /* The contents of the reference is the address to our object */
        keydata = *(void **)reference;

        return export(keydata, selection, export_cb, export_cbarg);
    }
    return 0;
}

#define D2I_PUBKEY_NOCTX(n, f)                              \
    static void *                                           \
    n##_d2i_PUBKEY(const unsigned char **der, long der_len, \
        ossl_unused struct der2key_ctx_st *ctx)             \
    {                                                       \
        return f(NULL, der, der_len);                       \
    }

/* ---------------------------------------------------------------------- */

#ifndef OPENSSL_NO_DH
#define dh_evp_type EVP_PKEY_DH
#define dh_d2i_private_key NULL
#define dh_d2i_public_key NULL
#define dh_d2i_key_params (d2i_of_void *)d2i_DHparams
#define dh_free (free_key_fn *)DH_free
#define dh_check NULL

static void *dh_d2i_PKCS8(const unsigned char **der, long der_len,
    struct der2key_ctx_st *ctx)
{
    return der2key_decode_p8(der, der_len, ctx,
        (key_from_pkcs8_t *)ossl_dh_key_from_pkcs8);
}

D2I_PUBKEY_NOCTX(dh, ossl_d2i_DH_PUBKEY)
D2I_PUBKEY_NOCTX(dhx, ossl_d2i_DHx_PUBKEY)

static void dh_adjust(void *key, struct der2key_ctx_st *ctx)
{
    ossl_dh_set0_libctx(key, PROV_LIBCTX_OF(ctx->provctx));
}

#define dhx_evp_type EVP_PKEY_DHX
#define dhx_d2i_private_key NULL
#define dhx_d2i_public_key NULL
#define dhx_d2i_key_params (d2i_of_void *)d2i_DHxparams
#define dhx_d2i_PKCS8 dh_d2i_PKCS8
#define dhx_free (free_key_fn *)DH_free
#define dhx_check NULL
#define dhx_adjust dh_adjust
#endif

/* ---------------------------------------------------------------------- */

#ifndef OPENSSL_NO_DSA
#define dsa_evp_type EVP_PKEY_DSA
#define dsa_d2i_private_key (d2i_of_void *)d2i_DSAPrivateKey
#define dsa_d2i_public_key (d2i_of_void *)d2i_DSAPublicKey
#define dsa_d2i_key_params (d2i_of_void *)d2i_DSAparams
#define dsa_free (free_key_fn *)DSA_free
#define dsa_check NULL

static void *dsa_d2i_PKCS8(const unsigned char **der, long der_len,
    struct der2key_ctx_st *ctx)
{
    return der2key_decode_p8(der, der_len, ctx,
        (key_from_pkcs8_t *)ossl_dsa_key_from_pkcs8);
}

D2I_PUBKEY_NOCTX(dsa, ossl_d2i_DSA_PUBKEY)

static void dsa_adjust(void *key, struct der2key_ctx_st *ctx)
{
    ossl_dsa_set0_libctx(key, PROV_LIBCTX_OF(ctx->provctx));
}
#endif

/* ---------------------------------------------------------------------- */

#ifndef OPENSSL_NO_EC
#define ec_evp_type EVP_PKEY_EC
#define ec_d2i_private_key (d2i_of_void *)d2i_ECPrivateKey
#define ec_d2i_public_key NULL
#define ec_d2i_key_params (d2i_of_void *)d2i_ECParameters
#define ec_free (free_key_fn *)EC_KEY_free

static void *ec_d2i_PKCS8(const unsigned char **der, long der_len,
    struct der2key_ctx_st *ctx)
{
    return der2key_decode_p8(der, der_len, ctx,
        (key_from_pkcs8_t *)ossl_ec_key_from_pkcs8);
}

D2I_PUBKEY_NOCTX(ec, d2i_EC_PUBKEY)

static int ec_check(void *key, struct der2key_ctx_st *ctx)
{
    /* We're trying to be clever by comparing two truths */
    int ret = 0;
    int sm2 = (EC_KEY_get_flags(key) & EC_FLAG_SM2_RANGE) != 0;

    if (sm2)
        ret = ctx->desc->evp_type == EVP_PKEY_SM2
            || ctx->desc->evp_type == NID_X9_62_id_ecPublicKey;
    else
        ret = ctx->desc->evp_type != EVP_PKEY_SM2;

    return ret;
}

static void ec_adjust(void *key, struct der2key_ctx_st *ctx)
{
    ossl_ec_key_set0_libctx(key, PROV_LIBCTX_OF(ctx->provctx));
}

#ifndef OPENSSL_NO_ECX
/*
 * ED25519, ED448, X25519, X448 only implement PKCS#8 and SubjectPublicKeyInfo,
 * so no d2i functions to be had.
 */

static void *ecx_d2i_PKCS8(const unsigned char **der, long der_len,
    struct der2key_ctx_st *ctx)
{
    return der2key_decode_p8(der, der_len, ctx,
        (key_from_pkcs8_t *)ossl_ecx_key_from_pkcs8);
}

D2I_PUBKEY_NOCTX(ed25519, ossl_d2i_ED25519_PUBKEY)
D2I_PUBKEY_NOCTX(ed448, ossl_d2i_ED448_PUBKEY)
D2I_PUBKEY_NOCTX(x25519, ossl_d2i_X25519_PUBKEY)
D2I_PUBKEY_NOCTX(x448, ossl_d2i_X448_PUBKEY)

static void ecx_key_adjust(void *key, struct der2key_ctx_st *ctx)
{
    ossl_ecx_key_set0_libctx(key, PROV_LIBCTX_OF(ctx->provctx));
}

#define ed25519_evp_type EVP_PKEY_ED25519
#define ed25519_d2i_private_key NULL
#define ed25519_d2i_public_key NULL
#define ed25519_d2i_key_params NULL
#define ed25519_d2i_PKCS8 ecx_d2i_PKCS8
#define ed25519_free (free_key_fn *)ossl_ecx_key_free
#define ed25519_check NULL
#define ed25519_adjust ecx_key_adjust

#define ed448_evp_type EVP_PKEY_ED448
#define ed448_d2i_private_key NULL
#define ed448_d2i_public_key NULL
#define ed448_d2i_key_params NULL
#define ed448_d2i_PKCS8 ecx_d2i_PKCS8
#define ed448_free (free_key_fn *)ossl_ecx_key_free
#define ed448_check NULL
#define ed448_adjust ecx_key_adjust

#define x25519_evp_type EVP_PKEY_X25519
#define x25519_d2i_private_key NULL
#define x25519_d2i_public_key NULL
#define x25519_d2i_key_params NULL
#define x25519_d2i_PKCS8 ecx_d2i_PKCS8
#define x25519_free (free_key_fn *)ossl_ecx_key_free
#define x25519_check NULL
#define x25519_adjust ecx_key_adjust

#define x448_evp_type EVP_PKEY_X448
#define x448_d2i_private_key NULL
#define x448_d2i_public_key NULL
#define x448_d2i_key_params NULL
#define x448_d2i_PKCS8 ecx_d2i_PKCS8
#define x448_free (free_key_fn *)ossl_ecx_key_free
#define x448_check NULL
#define x448_adjust ecx_key_adjust
#endif /* OPENSSL_NO_ECX */

#ifndef OPENSSL_NO_SM2
#define sm2_evp_type EVP_PKEY_SM2
#define sm2_d2i_private_key (d2i_of_void *)d2i_ECPrivateKey
#define sm2_d2i_public_key NULL
#define sm2_d2i_key_params (d2i_of_void *)d2i_ECParameters
#define sm2_d2i_PUBKEY ec_d2i_PUBKEY
#define sm2_free (free_key_fn *)EC_KEY_free
#define sm2_check ec_check
#define sm2_adjust ec_adjust

static void *sm2_d2i_PKCS8(const unsigned char **der, long der_len,
    struct der2key_ctx_st *ctx)
{
    return der2key_decode_p8(der, der_len, ctx,
        (key_from_pkcs8_t *)ossl_ec_key_from_pkcs8);
}
#endif

#endif

/* ---------------------------------------------------------------------- */

#ifndef OPENSSL_NO_ML_KEM
static void *
ml_kem_d2i_PKCS8(const uint8_t **der, long der_len, struct der2key_ctx_st *ctx)
{
    ML_KEM_KEY *key;

    key = ossl_ml_kem_d2i_PKCS8(*der, der_len, ctx->desc->evp_type,
        ctx->provctx, ctx->propq);
    if (key != NULL)
        *der += der_len;
    return key;
}

static ossl_inline void *
ml_kem_d2i_PUBKEY(const uint8_t **der, long der_len,
    struct der2key_ctx_st *ctx)
{
    ML_KEM_KEY *key;

    key = ossl_ml_kem_d2i_PUBKEY(*der, der_len, ctx->desc->evp_type,
        ctx->provctx, ctx->propq);
    if (key != NULL)
        *der += der_len;
    return key;
}

#define ml_kem_512_evp_type EVP_PKEY_ML_KEM_512
#define ml_kem_512_d2i_private_key NULL
#define ml_kem_512_d2i_public_key NULL
#define ml_kem_512_d2i_key_params NULL
#define ml_kem_512_d2i_PUBKEY ml_kem_d2i_PUBKEY
#define ml_kem_512_d2i_PKCS8 ml_kem_d2i_PKCS8
#define ml_kem_512_free (free_key_fn *)ossl_ml_kem_key_free
#define ml_kem_512_check NULL
#define ml_kem_512_adjust NULL

#define ml_kem_768_evp_type EVP_PKEY_ML_KEM_768
#define ml_kem_768_d2i_private_key NULL
#define ml_kem_768_d2i_public_key NULL
#define ml_kem_768_d2i_key_params NULL
#define ml_kem_768_d2i_PUBKEY ml_kem_d2i_PUBKEY
#define ml_kem_768_d2i_PKCS8 ml_kem_d2i_PKCS8
#define ml_kem_768_free (free_key_fn *)ossl_ml_kem_key_free
#define ml_kem_768_check NULL
#define ml_kem_768_adjust NULL

#define ml_kem_1024_evp_type EVP_PKEY_ML_KEM_1024
#define ml_kem_1024_d2i_private_key NULL
#define ml_kem_1024_d2i_public_key NULL
#define ml_kem_1024_d2i_PUBKEY ml_kem_d2i_PUBKEY
#define ml_kem_1024_d2i_PKCS8 ml_kem_d2i_PKCS8
#define ml_kem_1024_d2i_key_params NULL
#define ml_kem_1024_free (free_key_fn *)ossl_ml_kem_key_free
#define ml_kem_1024_check NULL
#define ml_kem_1024_adjust NULL

#endif

#ifndef OPENSSL_NO_SLH_DSA
static void *
slh_dsa_d2i_PKCS8(const uint8_t **der, long der_len, struct der2key_ctx_st *ctx)
{
    SLH_DSA_KEY *key = NULL, *ret = NULL;
    OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx);
    PKCS8_PRIV_KEY_INFO *p8inf = NULL;
    const unsigned char *p;
    const X509_ALGOR *alg = NULL;
    int plen, ptype;

    if ((p8inf = d2i_PKCS8_PRIV_KEY_INFO(NULL, der, der_len)) == NULL
        || !PKCS8_pkey_get0(NULL, &p, &plen, &alg, p8inf))
        goto end;

    /* Algorithm parameters must be absent. */
    if ((X509_ALGOR_get0(NULL, &ptype, NULL, alg), ptype != V_ASN1_UNDEF)) {
        ERR_raise_data(ERR_LIB_PROV, PROV_R_UNEXPECTED_KEY_PARAMETERS,
            "unexpected parameters with a PKCS#8 %s private key",
            ctx->desc->keytype_name);
        goto end;
    }
    if (OBJ_obj2nid(alg->algorithm) != ctx->desc->evp_type)
        goto end;
    if ((key = ossl_slh_dsa_key_new(libctx, ctx->propq,
             ctx->desc->keytype_name))
        == NULL)
        goto end;

    if (!ossl_slh_dsa_set_priv(key, p, plen))
        goto end;
    ret = key;
end:
    PKCS8_PRIV_KEY_INFO_free(p8inf);
    if (ret == NULL)
        ossl_slh_dsa_key_free(key);
    return ret;
}

static ossl_inline void *slh_dsa_d2i_PUBKEY(const uint8_t **der, long der_len,
    struct der2key_ctx_st *ctx)
{
    int ok = 0;
    OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx);
    SLH_DSA_KEY *ret = NULL;
    BARE_PUBKEY *spki = NULL;
    const uint8_t *end = *der;
    size_t len;

    ret = ossl_slh_dsa_key_new(libctx, ctx->propq, ctx->desc->keytype_name);
    if (ret == NULL)
        return NULL;
    len = ossl_slh_dsa_key_get_pub_len(ret);

    /*-
     * The DER ASN.1 encoding of SLH-DSA public keys prepends 18 bytes to the
     * encoded public key (since the largest public key size is 64 bytes):
     *
     * - 2 byte outer sequence tag and length
     * -  2 byte algorithm sequence tag and length
     * -    2 byte algorithm OID tag and length
     * -      9 byte algorithm OID
     * -  2 byte bit string tag and length
     * -    1 bitstring lead byte
     *
     * Check that we have the right OID, the bit string has no "bits left" and
     * that we consume all the input exactly.
     */
    if (der_len != 18 + (long)len) {
        ERR_raise_data(ERR_LIB_PROV, PROV_R_BAD_ENCODING,
            "unexpected %s public key length: %ld != %ld",
            ctx->desc->keytype_name, der_len,
            18 + (long)len);
        goto err;
    }

    if ((spki = OPENSSL_zalloc(sizeof(*spki))) == NULL)
        goto err;

    /* The spki storage is freed on error */
    if (ASN1_item_d2i_ex((ASN1_VALUE **)&spki, &end, der_len,
            ASN1_ITEM_rptr(BARE_PUBKEY), NULL, NULL)
        == NULL) {
        ERR_raise_data(ERR_LIB_PROV, PROV_R_BAD_ENCODING,
            "malformed %s public key ASN.1 encoding",
            ossl_slh_dsa_key_get_name(ret));
        goto err;
    }

    /* The spki structure now owns some memory */
    if ((spki->pubkey->flags & 0x7) != 0 || end != *der + der_len) {
        ERR_raise_data(ERR_LIB_PROV, PROV_R_BAD_ENCODING,
            "malformed %s public key ASN.1 encoding",
            ossl_slh_dsa_key_get_name(ret));
        goto err;
    }
    if (OBJ_cmp(OBJ_nid2obj(ctx->desc->evp_type), spki->algor.oid) != 0) {
        ERR_raise_data(ERR_LIB_PROV, PROV_R_BAD_ENCODING,
            "unexpected algorithm OID for an %s public key",
            ossl_slh_dsa_key_get_name(ret));
        goto err;
    }

    if (!ossl_slh_dsa_set_pub(ret, spki->pubkey->data, spki->pubkey->length)) {
        ERR_raise_data(ERR_LIB_PROV, PROV_R_BAD_ENCODING,
            "failed to parse %s public key from the input data",
            ossl_slh_dsa_key_get_name(ret));
        goto err;
    }
    ok = 1;
err:
    if (spki != NULL) {
        ASN1_OBJECT_free(spki->algor.oid);
        ASN1_BIT_STRING_free(spki->pubkey);
        OPENSSL_free(spki);
    }
    if (!ok) {
        ossl_slh_dsa_key_free(ret);
        ret = NULL;
    }
    return ret;
}

#define slh_dsa_sha2_128s_evp_type EVP_PKEY_SLH_DSA_SHA2_128S
#define slh_dsa_sha2_128s_d2i_private_key NULL
#define slh_dsa_sha2_128s_d2i_public_key NULL
#define slh_dsa_sha2_128s_d2i_key_params NULL
#define slh_dsa_sha2_128s_d2i_PKCS8 slh_dsa_d2i_PKCS8
#define slh_dsa_sha2_128s_d2i_PUBKEY slh_dsa_d2i_PUBKEY
#define slh_dsa_sha2_128s_free (free_key_fn *)ossl_slh_dsa_key_free
#define slh_dsa_sha2_128s_check NULL
#define slh_dsa_sha2_128s_adjust NULL

#define slh_dsa_sha2_128f_evp_type EVP_PKEY_SLH_DSA_SHA2_128F
#define slh_dsa_sha2_128f_d2i_private_key NULL
#define slh_dsa_sha2_128f_d2i_public_key NULL
#define slh_dsa_sha2_128f_d2i_key_params NULL
#define slh_dsa_sha2_128f_d2i_PKCS8 slh_dsa_d2i_PKCS8
#define slh_dsa_sha2_128f_d2i_PUBKEY slh_dsa_d2i_PUBKEY
#define slh_dsa_sha2_128f_free (free_key_fn *)ossl_slh_dsa_key_free
#define slh_dsa_sha2_128f_check NULL
#define slh_dsa_sha2_128f_adjust NULL

#define slh_dsa_sha2_192s_evp_type EVP_PKEY_SLH_DSA_SHA2_192S
#define slh_dsa_sha2_192s_d2i_private_key NULL
#define slh_dsa_sha2_192s_d2i_public_key NULL
#define slh_dsa_sha2_192s_d2i_key_params NULL
#define slh_dsa_sha2_192s_d2i_PKCS8 slh_dsa_d2i_PKCS8
#define slh_dsa_sha2_192s_d2i_PUBKEY slh_dsa_d2i_PUBKEY
#define slh_dsa_sha2_192s_free (free_key_fn *)ossl_slh_dsa_key_free
#define slh_dsa_sha2_192s_check NULL
#define slh_dsa_sha2_192s_adjust NULL

#define slh_dsa_sha2_192f_evp_type EVP_PKEY_SLH_DSA_SHA2_192F
#define slh_dsa_sha2_192f_d2i_private_key NULL
#define slh_dsa_sha2_192f_d2i_public_key NULL
#define slh_dsa_sha2_192f_d2i_key_params NULL
#define slh_dsa_sha2_192f_d2i_PKCS8 slh_dsa_d2i_PKCS8
#define slh_dsa_sha2_192f_d2i_PUBKEY slh_dsa_d2i_PUBKEY
#define slh_dsa_sha2_192f_free (free_key_fn *)ossl_slh_dsa_key_free
#define slh_dsa_sha2_192f_check NULL
#define slh_dsa_sha2_192f_adjust NULL

#define slh_dsa_sha2_256s_evp_type EVP_PKEY_SLH_DSA_SHA2_256S
#define slh_dsa_sha2_256s_d2i_private_key NULL
#define slh_dsa_sha2_256s_d2i_public_key NULL
#define slh_dsa_sha2_256s_d2i_key_params NULL
#define slh_dsa_sha2_256s_d2i_PKCS8 slh_dsa_d2i_PKCS8
#define slh_dsa_sha2_256s_d2i_PUBKEY slh_dsa_d2i_PUBKEY
#define slh_dsa_sha2_256s_free (free_key_fn *)ossl_slh_dsa_key_free
#define slh_dsa_sha2_256s_check NULL
#define slh_dsa_sha2_256s_adjust NULL

#define slh_dsa_sha2_256f_evp_type EVP_PKEY_SLH_DSA_SHA2_256F
#define slh_dsa_sha2_256f_d2i_private_key NULL
#define slh_dsa_sha2_256f_d2i_public_key NULL
#define slh_dsa_sha2_256f_d2i_key_params NULL
#define slh_dsa_sha2_256f_d2i_PKCS8 slh_dsa_d2i_PKCS8
#define slh_dsa_sha2_256f_d2i_PUBKEY slh_dsa_d2i_PUBKEY
#define slh_dsa_sha2_256f_free (free_key_fn *)ossl_slh_dsa_key_free
#define slh_dsa_sha2_256f_check NULL
#define slh_dsa_sha2_256f_adjust NULL

#define slh_dsa_shake_128s_evp_type EVP_PKEY_SLH_DSA_SHAKE_128S
#define slh_dsa_shake_128s_d2i_private_key NULL
#define slh_dsa_shake_128s_d2i_public_key NULL
#define slh_dsa_shake_128s_d2i_key_params NULL
#define slh_dsa_shake_128s_d2i_PKCS8 slh_dsa_d2i_PKCS8
#define slh_dsa_shake_128s_d2i_PUBKEY slh_dsa_d2i_PUBKEY
#define slh_dsa_shake_128s_free (free_key_fn *)ossl_slh_dsa_key_free
#define slh_dsa_shake_128s_check NULL
#define slh_dsa_shake_128s_adjust NULL

#define slh_dsa_shake_128f_evp_type EVP_PKEY_SLH_DSA_SHAKE_128F
#define slh_dsa_shake_128f_d2i_private_key NULL
#define slh_dsa_shake_128f_d2i_public_key NULL
#define slh_dsa_shake_128f_d2i_key_params NULL
#define slh_dsa_shake_128f_d2i_PKCS8 slh_dsa_d2i_PKCS8
#define slh_dsa_shake_128f_d2i_PUBKEY slh_dsa_d2i_PUBKEY
#define slh_dsa_shake_128f_free (free_key_fn *)ossl_slh_dsa_key_free
#define slh_dsa_shake_128f_check NULL
#define slh_dsa_shake_128f_adjust NULL

#define slh_dsa_shake_192s_evp_type EVP_PKEY_SLH_DSA_SHAKE_192S
#define slh_dsa_shake_192s_d2i_private_key NULL
#define slh_dsa_shake_192s_d2i_public_key NULL
#define slh_dsa_shake_192s_d2i_key_params NULL
#define slh_dsa_shake_192s_d2i_PKCS8 slh_dsa_d2i_PKCS8
#define slh_dsa_shake_192s_d2i_PUBKEY slh_dsa_d2i_PUBKEY
#define slh_dsa_shake_192s_free (free_key_fn *)ossl_slh_dsa_key_free
#define slh_dsa_shake_192s_check NULL
#define slh_dsa_shake_192s_adjust NULL

#define slh_dsa_shake_192f_evp_type EVP_PKEY_SLH_DSA_SHAKE_192F
#define slh_dsa_shake_192f_d2i_private_key NULL
#define slh_dsa_shake_192f_d2i_public_key NULL
#define slh_dsa_shake_192f_d2i_key_params NULL
#define slh_dsa_shake_192f_d2i_PKCS8 slh_dsa_d2i_PKCS8
#define slh_dsa_shake_192f_d2i_PUBKEY slh_dsa_d2i_PUBKEY
#define slh_dsa_shake_192f_free (free_key_fn *)ossl_slh_dsa_key_free
#define slh_dsa_shake_192f_check NULL
#define slh_dsa_shake_192f_adjust NULL

#define slh_dsa_shake_256s_evp_type EVP_PKEY_SLH_DSA_SHAKE_256S
#define slh_dsa_shake_256s_d2i_private_key NULL
#define slh_dsa_shake_256s_d2i_public_key NULL
#define slh_dsa_shake_256s_d2i_key_params NULL
#define slh_dsa_shake_256s_d2i_PKCS8 slh_dsa_d2i_PKCS8
#define slh_dsa_shake_256s_d2i_PUBKEY slh_dsa_d2i_PUBKEY
#define slh_dsa_shake_256s_free (free_key_fn *)ossl_slh_dsa_key_free
#define slh_dsa_shake_256s_check NULL
#define slh_dsa_shake_256s_adjust NULL

#define slh_dsa_shake_256f_evp_type EVP_PKEY_SLH_DSA_SHAKE_256F
#define slh_dsa_shake_256f_d2i_private_key NULL
#define slh_dsa_shake_256f_d2i_public_key NULL
#define slh_dsa_shake_256f_d2i_key_params NULL
#define slh_dsa_shake_256f_d2i_PKCS8 slh_dsa_d2i_PKCS8
#define slh_dsa_shake_256f_d2i_PUBKEY slh_dsa_d2i_PUBKEY
#define slh_dsa_shake_256f_free (free_key_fn *)ossl_slh_dsa_key_free
#define slh_dsa_shake_256f_check NULL
#define slh_dsa_shake_256f_adjust NULL
#endif /* OPENSSL_NO_SLH_DSA */

/* ---------------------------------------------------------------------- */

#define rsa_evp_type EVP_PKEY_RSA
#define rsa_d2i_private_key (d2i_of_void *)d2i_RSAPrivateKey
#define rsa_d2i_public_key (d2i_of_void *)d2i_RSAPublicKey
#define rsa_d2i_key_params NULL
#define rsa_free (free_key_fn *)RSA_free

static void *rsa_d2i_PKCS8(const unsigned char **der, long der_len,
    struct der2key_ctx_st *ctx)
{
    return der2key_decode_p8(der, der_len, ctx,
        (key_from_pkcs8_t *)ossl_rsa_key_from_pkcs8);
}

static void *
rsa_d2i_PUBKEY(const unsigned char **der, long der_len,
    ossl_unused struct der2key_ctx_st *ctx)
{
    return d2i_RSA_PUBKEY(NULL, der, der_len);
}

static int rsa_check(void *key, struct der2key_ctx_st *ctx)
{
    int valid;

    switch (RSA_test_flags(key, RSA_FLAG_TYPE_MASK)) {
    case RSA_FLAG_TYPE_RSA:
        valid = (ctx->desc->evp_type == EVP_PKEY_RSA);
        break;
    case RSA_FLAG_TYPE_RSASSAPSS:
        valid = (ctx->desc->evp_type == EVP_PKEY_RSA_PSS);
        break;
    default:
        /* Currently unsupported RSA key type */
        valid = 0;
    }

    valid = (valid && ossl_rsa_check_factors(key));

    return valid;
}

static void rsa_adjust(void *key, struct der2key_ctx_st *ctx)
{
    ossl_rsa_set0_libctx(key, PROV_LIBCTX_OF(ctx->provctx));
}

#define rsapss_evp_type EVP_PKEY_RSA_PSS
#define rsapss_d2i_private_key (d2i_of_void *)d2i_RSAPrivateKey
#define rsapss_d2i_public_key (d2i_of_void *)d2i_RSAPublicKey
#define rsapss_d2i_key_params NULL
#define rsapss_d2i_PKCS8 rsa_d2i_PKCS8
#define rsapss_d2i_PUBKEY rsa_d2i_PUBKEY
#define rsapss_free (free_key_fn *)RSA_free
#define rsapss_check rsa_check
#define rsapss_adjust rsa_adjust

/* ---------------------------------------------------------------------- */

#ifndef OPENSSL_NO_ML_DSA
static void *
ml_dsa_d2i_PKCS8(const uint8_t **der, long der_len, struct der2key_ctx_st *ctx)
{
    ML_DSA_KEY *key;

    key = ossl_ml_dsa_d2i_PKCS8(*der, der_len, ctx->desc->evp_type,
        ctx->provctx, ctx->propq);
    if (key != NULL)
        *der += der_len;
    return key;
}

static ossl_inline void *ml_dsa_d2i_PUBKEY(const uint8_t **der, long der_len,
    struct der2key_ctx_st *ctx)
{
    ML_DSA_KEY *key;

    key = ossl_ml_dsa_d2i_PUBKEY(*der, der_len, ctx->desc->evp_type,
        ctx->provctx, ctx->propq);
    if (key != NULL)
        *der += der_len;
    return key;
}

#define ml_dsa_44_evp_type EVP_PKEY_ML_DSA_44
#define ml_dsa_44_d2i_private_key NULL
#define ml_dsa_44_d2i_public_key NULL
#define ml_dsa_44_d2i_key_params NULL
#define ml_dsa_44_d2i_PUBKEY ml_dsa_d2i_PUBKEY
#define ml_dsa_44_d2i_PKCS8 ml_dsa_d2i_PKCS8
#define ml_dsa_44_free (free_key_fn *)ossl_ml_dsa_key_free
#define ml_dsa_44_check NULL
#define ml_dsa_44_adjust NULL

#define ml_dsa_65_evp_type EVP_PKEY_ML_DSA_65
#define ml_dsa_65_d2i_private_key NULL
#define ml_dsa_65_d2i_public_key NULL
#define ml_dsa_65_d2i_key_params NULL
#define ml_dsa_65_d2i_PUBKEY ml_dsa_d2i_PUBKEY
#define ml_dsa_65_d2i_PKCS8 ml_dsa_d2i_PKCS8
#define ml_dsa_65_free (free_key_fn *)ossl_ml_dsa_key_free
#define ml_dsa_65_check NULL
#define ml_dsa_65_adjust NULL

#define ml_dsa_87_evp_type EVP_PKEY_ML_DSA_87
#define ml_dsa_87_d2i_private_key NULL
#define ml_dsa_87_d2i_public_key NULL
#define ml_dsa_87_d2i_PUBKEY ml_dsa_d2i_PUBKEY
#define ml_dsa_87_d2i_PKCS8 ml_dsa_d2i_PKCS8
#define ml_dsa_87_d2i_key_params NULL
#define ml_dsa_87_free (free_key_fn *)ossl_ml_dsa_key_free
#define ml_dsa_87_check NULL
#define ml_dsa_87_adjust NULL

#endif

/* ---------------------------------------------------------------------- */

/*
 * The DO_ macros help define the selection mask and the method functions
 * for each kind of object we want to decode.
 */
#define DO_type_specific_keypair(keytype) \
    "type-specific", keytype##_evp_type,  \
        (OSSL_KEYMGMT_SELECT_KEYPAIR),    \
        keytype##_d2i_private_key,        \
        keytype##_d2i_public_key,         \
        NULL,                             \
        NULL,                             \
        NULL,                             \
        keytype##_check,                  \
        keytype##_adjust,                 \
        keytype##_free

#define DO_type_specific_pub(keytype)     \
    "type-specific", keytype##_evp_type,  \
        (OSSL_KEYMGMT_SELECT_PUBLIC_KEY), \
        NULL,                             \
        keytype##_d2i_public_key,         \
        NULL,                             \
        NULL,                             \
        NULL,                             \
        keytype##_check,                  \
        keytype##_adjust,                 \
        keytype##_free

#define DO_type_specific_priv(keytype)     \
    "type-specific", keytype##_evp_type,   \
        (OSSL_KEYMGMT_SELECT_PRIVATE_KEY), \
        keytype##_d2i_private_key,         \
        NULL,                              \
        NULL,                              \
        NULL,                              \
        NULL,                              \
        keytype##_check,                   \
        keytype##_adjust,                  \
        keytype##_free

#define DO_type_specific_params(keytype)      \
    "type-specific", keytype##_evp_type,      \
        (OSSL_KEYMGMT_SELECT_ALL_PARAMETERS), \
        NULL,                                 \
        NULL,                                 \
        keytype##_d2i_key_params,             \
        NULL,                                 \
        NULL,                                 \
        keytype##_check,                      \
        keytype##_adjust,                     \
        keytype##_free

#define DO_type_specific(keytype)        \
    "type-specific", keytype##_evp_type, \
        (OSSL_KEYMGMT_SELECT_ALL),       \
        keytype##_d2i_private_key,       \
        keytype##_d2i_public_key,        \
        keytype##_d2i_key_params,        \
        NULL,                            \
        NULL,                            \
        keytype##_check,                 \
        keytype##_adjust,                \
        keytype##_free

#define DO_type_specific_no_pub(keytype)           \
    "type-specific", keytype##_evp_type,           \
        (OSSL_KEYMGMT_SELECT_PRIVATE_KEY           \
            | OSSL_KEYMGMT_SELECT_ALL_PARAMETERS), \
        keytype##_d2i_private_key,                 \
        NULL,                                      \
        keytype##_d2i_key_params,                  \
        NULL,                                      \
        NULL,                                      \
        keytype##_check,                           \
        keytype##_adjust,                          \
        keytype##_free

#define DO_PrivateKeyInfo(keytype)         \
    "PrivateKeyInfo", keytype##_evp_type,  \
        (OSSL_KEYMGMT_SELECT_PRIVATE_KEY), \
        NULL,                              \
        NULL,                              \
        NULL,                              \
        keytype##_d2i_PKCS8,               \
        NULL,                              \
        keytype##_check,                   \
        keytype##_adjust,                  \
        keytype##_free

#define DO_SubjectPublicKeyInfo(keytype)        \
    "SubjectPublicKeyInfo", keytype##_evp_type, \
        (OSSL_KEYMGMT_SELECT_PUBLIC_KEY),       \
        NULL,                                   \
        NULL,                                   \
        NULL,                                   \
        NULL,                                   \
        keytype##_d2i_PUBKEY,                   \
        keytype##_check,                        \
        keytype##_adjust,                       \
        keytype##_free

#define DO_DH(keytype)                        \
    "DH", keytype##_evp_type,                 \
        (OSSL_KEYMGMT_SELECT_ALL_PARAMETERS), \
        NULL,                                 \
        NULL,                                 \
        keytype##_d2i_key_params,             \
        NULL,                                 \
        NULL,                                 \
        keytype##_check,                      \
        keytype##_adjust,                     \
        keytype##_free

#define DO_DHX(keytype)                       \
    "DHX", keytype##_evp_type,                \
        (OSSL_KEYMGMT_SELECT_ALL_PARAMETERS), \
        NULL,                                 \
        NULL,                                 \
        keytype##_d2i_key_params,             \
        NULL,                                 \
        NULL,                                 \
        keytype##_check,                      \
        keytype##_adjust,                     \
        keytype##_free

#define DO_DSA(keytype)            \
    "DSA", keytype##_evp_type,     \
        (OSSL_KEYMGMT_SELECT_ALL), \
        keytype##_d2i_private_key, \
        keytype##_d2i_public_key,  \
        keytype##_d2i_key_params,  \
        NULL,                      \
        NULL,                      \
        keytype##_check,           \
        keytype##_adjust,          \
        keytype##_free

#define DO_EC(keytype)                             \
    "EC", keytype##_evp_type,                      \
        (OSSL_KEYMGMT_SELECT_PRIVATE_KEY           \
            | OSSL_KEYMGMT_SELECT_ALL_PARAMETERS), \
        keytype##_d2i_private_key,                 \
        NULL,                                      \
        keytype##_d2i_key_params,                  \
        NULL,                                      \
        NULL,                                      \
        keytype##_check,                           \
        keytype##_adjust,                          \
        keytype##_free

#define DO_RSA(keytype)                \
    "RSA", keytype##_evp_type,         \
        (OSSL_KEYMGMT_SELECT_KEYPAIR), \
        keytype##_d2i_private_key,     \
        keytype##_d2i_public_key,      \
        NULL,                          \
        NULL,                          \
        NULL,                          \
        keytype##_check,               \
        keytype##_adjust,              \
        keytype##_free

/*
 * MAKE_DECODER is the single driver for creating OSSL_DISPATCH tables.
 * It takes the following arguments:
 *
 * keytype_name The implementation key type as a string.
 * keytype      The implementation key type.  This must correspond exactly
 *              to our existing keymgmt keytype names...  in other words,
 *              there must exist an ossl_##keytype##_keymgmt_functions.
 * type         The type name for the set of functions that implement the
 *              decoder for the key type.  This isn't necessarily the same
 *              as keytype.  For example, the key types ed25519, ed448,
 *              x25519 and x448 are all handled by the same functions with
 *              the common type name ecx.
 * kind         The kind of support to implement.  This translates into
 *              the DO_##kind macros above, to populate the keytype_desc_st
 *              structure.
 */
#define MAKE_DECODER(keytype_name, keytype, type, kind)                                                               \
    static const struct keytype_desc_st kind##_##keytype##_desc = { keytype_name, ossl_##keytype##_keymgmt_functions, \
        DO_##kind(keytype) };                                                                                         \
                                                                                                                      \
    static OSSL_FUNC_decoder_newctx_fn kind##_der2##keytype##_newctx;                                                 \
                                                                                                                      \
    static void *kind##_der2##keytype##_newctx(void *provctx)                                                         \
    {                                                                                                                 \
        return der2key_newctx(provctx, &kind##_##keytype##_desc);                                                     \
    }                                                                                                                 \
    static int kind##_der2##keytype##_does_selection(void *provctx,                                                   \
        int selection)                                                                                                \
    {                                                                                                                 \
        return der2key_check_selection(selection,                                                                     \
            &kind##_##keytype##_desc);                                                                                \
    }                                                                                                                 \
    const OSSL_DISPATCH                                                                                               \
        ossl_##kind##_der_to_##keytype##_decoder_functions[]                                                          \
        = {                                                                                                           \
              { OSSL_FUNC_DECODER_NEWCTX,                                                                             \
                  (void (*)(void))kind##_der2##keytype##_newctx },                                                    \
              { OSSL_FUNC_DECODER_FREECTX,                                                                            \
                  (void (*)(void))der2key_freectx },                                                                  \
              { OSSL_FUNC_DECODER_DOES_SELECTION,                                                                     \
                  (void (*)(void))kind##_der2##keytype##_does_selection },                                            \
              { OSSL_FUNC_DECODER_DECODE,                                                                             \
                  (void (*)(void))der2key_decode },                                                                   \
              { OSSL_FUNC_DECODER_EXPORT_OBJECT,                                                                      \
                  (void (*)(void))der2key_export_object },                                                            \
              { OSSL_FUNC_DECODER_SETTABLE_CTX_PARAMS,                                                                \
                  (void (*)(void))der2key_settable_ctx_params },                                                      \
              { OSSL_FUNC_DECODER_SET_CTX_PARAMS,                                                                     \
                  (void (*)(void))der2key_set_ctx_params },                                                           \
              OSSL_DISPATCH_END                                                                                       \
          }

#ifndef OPENSSL_NO_DH
MAKE_DECODER("DH", dh, dh, PrivateKeyInfo);
MAKE_DECODER("DH", dh, dh, SubjectPublicKeyInfo);
MAKE_DECODER("DH", dh, dh, type_specific_params);
MAKE_DECODER("DH", dh, dh, DH);
MAKE_DECODER("DHX", dhx, dhx, PrivateKeyInfo);
MAKE_DECODER("DHX", dhx, dhx, SubjectPublicKeyInfo);
MAKE_DECODER("DHX", dhx, dhx, type_specific_params);
MAKE_DECODER("DHX", dhx, dhx, DHX);
#endif
#ifndef OPENSSL_NO_DSA
MAKE_DECODER("DSA", dsa, dsa, PrivateKeyInfo);
MAKE_DECODER("DSA", dsa, dsa, SubjectPublicKeyInfo);
MAKE_DECODER("DSA", dsa, dsa, type_specific);
MAKE_DECODER("DSA", dsa, dsa, DSA);
#endif
#ifndef OPENSSL_NO_EC
MAKE_DECODER("EC", ec, ec, PrivateKeyInfo);
MAKE_DECODER("EC", ec, ec, SubjectPublicKeyInfo);
MAKE_DECODER("EC", ec, ec, type_specific_no_pub);
MAKE_DECODER("EC", ec, ec, EC);
#ifndef OPENSSL_NO_ECX
MAKE_DECODER("X25519", x25519, ecx, PrivateKeyInfo);
MAKE_DECODER("X25519", x25519, ecx, SubjectPublicKeyInfo);
MAKE_DECODER("X448", x448, ecx, PrivateKeyInfo);
MAKE_DECODER("X448", x448, ecx, SubjectPublicKeyInfo);
MAKE_DECODER("ED25519", ed25519, ecx, PrivateKeyInfo);
MAKE_DECODER("ED25519", ed25519, ecx, SubjectPublicKeyInfo);
MAKE_DECODER("ED448", ed448, ecx, PrivateKeyInfo);
MAKE_DECODER("ED448", ed448, ecx, SubjectPublicKeyInfo);
#endif
#ifndef OPENSSL_NO_SM2
MAKE_DECODER("SM2", sm2, ec, PrivateKeyInfo);
MAKE_DECODER("SM2", sm2, ec, SubjectPublicKeyInfo);
MAKE_DECODER("SM2", sm2, sm2, type_specific_no_pub);
#endif
#endif
#ifndef OPENSSL_NO_ML_KEM
MAKE_DECODER("ML-KEM-512", ml_kem_512, ml_kem_512, PrivateKeyInfo);
MAKE_DECODER("ML-KEM-512", ml_kem_512, ml_kem_512, SubjectPublicKeyInfo);
MAKE_DECODER("ML-KEM-768", ml_kem_768, ml_kem_768, PrivateKeyInfo);
MAKE_DECODER("ML-KEM-768", ml_kem_768, ml_kem_768, SubjectPublicKeyInfo);
MAKE_DECODER("ML-KEM-1024", ml_kem_1024, ml_kem_1024, PrivateKeyInfo);
MAKE_DECODER("ML-KEM-1024", ml_kem_1024, ml_kem_1024, SubjectPublicKeyInfo);
#endif
#ifndef OPENSSL_NO_SLH_DSA
MAKE_DECODER("SLH-DSA-SHA2-128s", slh_dsa_sha2_128s, slh_dsa, PrivateKeyInfo);
MAKE_DECODER("SLH-DSA-SHA2-128f", slh_dsa_sha2_128f, slh_dsa, PrivateKeyInfo);
MAKE_DECODER("SLH-DSA-SHA2-192s", slh_dsa_sha2_192s, slh_dsa, PrivateKeyInfo);
MAKE_DECODER("SLH-DSA-SHA2-192f", slh_dsa_sha2_192f, slh_dsa, PrivateKeyInfo);
MAKE_DECODER("SLH-DSA-SHA2-256s", slh_dsa_sha2_256s, slh_dsa, PrivateKeyInfo);
MAKE_DECODER("SLH-DSA-SHA2-256f", slh_dsa_sha2_256f, slh_dsa, PrivateKeyInfo);
MAKE_DECODER("SLH-DSA-SHAKE-128s", slh_dsa_shake_128s, slh_dsa, PrivateKeyInfo);
MAKE_DECODER("SLH-DSA-SHAKE-128f", slh_dsa_shake_128f, slh_dsa, PrivateKeyInfo);
MAKE_DECODER("SLH-DSA-SHAKE-192s", slh_dsa_shake_192s, slh_dsa, PrivateKeyInfo);
MAKE_DECODER("SLH-DSA-SHAKE-192f", slh_dsa_shake_192f, slh_dsa, PrivateKeyInfo);
MAKE_DECODER("SLH-DSA-SHAKE-256s", slh_dsa_shake_256s, slh_dsa, PrivateKeyInfo);
MAKE_DECODER("SLH-DSA-SHAKE-256f", slh_dsa_shake_256f, slh_dsa, PrivateKeyInfo);

MAKE_DECODER("SLH-DSA-SHA2-128s", slh_dsa_sha2_128s, slh_dsa, SubjectPublicKeyInfo);
MAKE_DECODER("SLH-DSA-SHA2-128f", slh_dsa_sha2_128f, slh_dsa, SubjectPublicKeyInfo);
MAKE_DECODER("SLH-DSA-SHA2-192s", slh_dsa_sha2_192s, slh_dsa, SubjectPublicKeyInfo);
MAKE_DECODER("SLH-DSA-SHA2-192f", slh_dsa_sha2_192f, slh_dsa, SubjectPublicKeyInfo);
MAKE_DECODER("SLH-DSA-SHA2-256s", slh_dsa_sha2_256s, slh_dsa, SubjectPublicKeyInfo);
MAKE_DECODER("SLH-DSA-SHA2-256f", slh_dsa_sha2_256f, slh_dsa, SubjectPublicKeyInfo);
MAKE_DECODER("SLH-DSA-SHAKE-128s", slh_dsa_shake_128s, slh_dsa, SubjectPublicKeyInfo);
MAKE_DECODER("SLH-DSA-SHAKE-128f", slh_dsa_shake_128f, slh_dsa, SubjectPublicKeyInfo);
MAKE_DECODER("SLH-DSA-SHAKE-192s", slh_dsa_shake_192s, slh_dsa, SubjectPublicKeyInfo);
MAKE_DECODER("SLH-DSA-SHAKE-192f", slh_dsa_shake_192f, slh_dsa, SubjectPublicKeyInfo);
MAKE_DECODER("SLH-DSA-SHAKE-256s", slh_dsa_shake_256s, slh_dsa, SubjectPublicKeyInfo);
MAKE_DECODER("SLH-DSA-SHAKE-256f", slh_dsa_shake_256f, slh_dsa, SubjectPublicKeyInfo);
#endif /* OPENSSL_NO_SLH_DSA */
MAKE_DECODER("RSA", rsa, rsa, PrivateKeyInfo);
MAKE_DECODER("RSA", rsa, rsa, SubjectPublicKeyInfo);
MAKE_DECODER("RSA", rsa, rsa, type_specific_keypair);
MAKE_DECODER("RSA", rsa, rsa, RSA);
MAKE_DECODER("RSA-PSS", rsapss, rsapss, PrivateKeyInfo);
MAKE_DECODER("RSA-PSS", rsapss, rsapss, SubjectPublicKeyInfo);

#ifndef OPENSSL_NO_ML_DSA
MAKE_DECODER("ML-DSA-44", ml_dsa_44, ml_dsa_44, PrivateKeyInfo);
MAKE_DECODER("ML-DSA-44", ml_dsa_44, ml_dsa_44, SubjectPublicKeyInfo);
MAKE_DECODER("ML-DSA-65", ml_dsa_65, ml_dsa_65, PrivateKeyInfo);
MAKE_DECODER("ML-DSA-65", ml_dsa_65, ml_dsa_65, SubjectPublicKeyInfo);
MAKE_DECODER("ML-DSA-87", ml_dsa_87, ml_dsa_87, PrivateKeyInfo);
MAKE_DECODER("ML-DSA-87", ml_dsa_87, ml_dsa_87, SubjectPublicKeyInfo);
#endif