/*

 * Copyright 2011-2026 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

 */

/* clang-format off */

/* clang-format on */

#include <stdlib.h>

#include <string.h>

#include <openssl/crypto.h>

#include <openssl/err.h>

#include <openssl/rand.h>

#include <openssl/proverr.h>

#include "internal/cryptlib.h"

#include "internal/thread_once.h"

#include "prov/providercommon.h"

#include "prov/implementations.h"

#include "prov/provider_ctx.h"

#include "prov/hmac_drbg.h"

#include "prov/drbg.h"

#include "crypto/evp.h"

#include "crypto/evp/evp_local.h"

#include "internal/provider.h"

static OSSL_FUNC_rand_newctx_fn drbg_hmac_new_wrapper;

static OSSL_FUNC_rand_freectx_fn drbg_hmac_free;

static OSSL_FUNC_rand_instantiate_fn drbg_hmac_instantiate_wrapper;

static OSSL_FUNC_rand_uninstantiate_fn drbg_hmac_uninstantiate_wrapper;

static OSSL_FUNC_rand_generate_fn drbg_hmac_generate_wrapper;

static OSSL_FUNC_rand_reseed_fn drbg_hmac_reseed_wrapper;

static OSSL_FUNC_rand_settable_ctx_params_fn drbg_hmac_settable_ctx_params;

static OSSL_FUNC_rand_set_ctx_params_fn drbg_hmac_set_ctx_params;

static OSSL_FUNC_rand_gettable_ctx_params_fn drbg_hmac_gettable_ctx_params;

static OSSL_FUNC_rand_get_ctx_params_fn drbg_hmac_get_ctx_params;

static OSSL_FUNC_rand_verify_zeroization_fn drbg_hmac_verify_zeroization;

static int drbg_hmac_set_ctx_params_locked(PROV_DRBG *drbg, const struct drbg_set_ctx_params_st *p);

static int drbg_hmac_set_ctx_params_decoder(const OSSL_PARAM params[],

    struct drbg_set_ctx_params_st *p);

/*

 * Called twice by SP800-90Ar1 10.1.2.2 HMAC_DRBG_Update_Process.

 *

 * hmac is an object that holds the input/output Key and Value (K and V).

 * inbyte is 0x00 on the first call and 0x01 on the second call.

 * in1, in2, in3 are optional inputs that can be NULL.

 * in1len, in2len, in3len are the lengths of the input buffers.

 *

 * The returned K,V is:

 *   hmac->K = HMAC(hmac->K, hmac->V || inbyte || [in1] || [in2] || [in3])

 *   hmac->V = HMAC(hmac->K, hmac->V)

 *

 * Returns zero if an error occurs otherwise it returns 1.

 */

static int do_hmac(PROV_DRBG_HMAC *hmac, unsigned char inbyte,

    const unsigned char *in1, size_t in1len,

    const unsigned char *in2, size_t in2len,

    const unsigned char *in3, size_t in3len)

{

    EVP_MAC_CTX *ctx = hmac->ctx;

    if (!EVP_MAC_init(ctx, hmac->K, hmac->blocklen, NULL)

        /* K = HMAC(K, V || inbyte || [in1] || [in2] || [in3]) */

        || !EVP_MAC_update(ctx, hmac->V, hmac->blocklen)

        || !EVP_MAC_update(ctx, &inbyte, 1)

        || !(in1 == NULL || in1len == 0 || EVP_MAC_update(ctx, in1, in1len))

        || !(in2 == NULL || in2len == 0 || EVP_MAC_update(ctx, in2, in2len))

        || !(in3 == NULL || in3len == 0 || EVP_MAC_update(ctx, in3, in3len))

        || !EVP_MAC_final(ctx, hmac->K, NULL, sizeof(hmac->K)))

        return 0;

    /* V = HMAC(K, V) */

    return EVP_MAC_init(ctx, hmac->K, hmac->blocklen, NULL)

        && EVP_MAC_update(ctx, hmac->V, hmac->blocklen)

        && EVP_MAC_final(ctx, hmac->V, NULL, sizeof(hmac->V));

}

/*

 * SP800-90Ar1 10.1.2.2 HMAC_DRBG_Update_Process

 *

 *

 * Updates the drbg objects Key(K) and Value(V) using the following algorithm:

 *   K,V = do_hmac(hmac, 0, in1, in2, in3)

 *   if (any input is not NULL)

 *     K,V = do_hmac(hmac, 1, in1, in2, in3)

 *

 * where in1, in2, in3 are optional input buffers that can be NULL.

 *       in1len, in2len, in3len are the lengths of the input buffers.

 *

 * Returns zero if an error occurs otherwise it returns 1.

 */

static int drbg_hmac_update(PROV_DRBG_HMAC *hmac,

    const unsigned char *in1, size_t in1len,

    const unsigned char *in2, size_t in2len,

    const unsigned char *in3, size_t in3len)

{

    /* (Steps 1-2) K = HMAC(K, V||0x00||provided_data). V = HMAC(K,V) */

    if (!do_hmac(hmac, 0x00, in1, in1len, in2, in2len, in3, in3len))

        return 0;

    /* (Step 3) If provided_data == NULL then return (K,V) */

    if (in1len == 0 && in2len == 0 && in3len == 0)

        return 1;

    /* (Steps 4-5) K = HMAC(K, V||0x01||provided_data). V = HMAC(K,V) */

    return do_hmac(hmac, 0x01, in1, in1len, in2, in2len, in3, in3len);

}

/*

 * SP800-90Ar1 10.1.2.3 HMAC_DRBG_Instantiate_Process:

 *

 * This sets the drbg Key (K) to all zeros, and Value (V) to all 1's.

 * and then calls (K,V) = drbg_hmac_update() with input parameters:

 *   ent = entropy data (Can be NULL) of length ent_len.

 *   nonce = nonce data (Can be NULL) of length nonce_len.

 *   pstr = personalization data (Can be NULL) of length pstr_len.

 *

 * Returns zero if an error occurs otherwise it returns 1.

 */

int ossl_drbg_hmac_init(PROV_DRBG_HMAC *hmac,

    const unsigned char *ent, size_t ent_len,

    const unsigned char *nonce, size_t nonce_len,

    const unsigned char *pstr, size_t pstr_len)

{

    if (hmac->ctx == NULL) {

        ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MAC);

        return 0;

    }

    /* (Step 2) Key = 0x00 00...00 */

    memset(hmac->K, 0x00, hmac->blocklen);

    /* (Step 3) V = 0x01 01...01 */

    memset(hmac->V, 0x01, hmac->blocklen);

    /* (Step 4) (K,V) = HMAC_DRBG_Update(entropy||nonce||pers string, K, V) */

    return drbg_hmac_update(hmac, ent, ent_len, nonce, nonce_len, pstr,

        pstr_len);

}

static int drbg_hmac_instantiate(PROV_DRBG *drbg,

    const unsigned char *ent, size_t ent_len,

    const unsigned char *nonce, size_t nonce_len,

    const unsigned char *pstr, size_t pstr_len)

{

    return ossl_drbg_hmac_init((PROV_DRBG_HMAC *)drbg->data, ent, ent_len,

        nonce, nonce_len, pstr, pstr_len);

}

static int drbg_hmac_instantiate_wrapper(void *vdrbg, unsigned int strength,

    int prediction_resistance,

    const unsigned char *pstr,

    size_t pstr_len,

    const OSSL_PARAM params[])

{

    PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;

    struct drbg_set_ctx_params_st p;

    int ret = 0;

    if (drbg == NULL || !drbg_hmac_set_ctx_params_decoder(params, &p))

        return 0;

    if (drbg->lock != NULL && !CRYPTO_THREAD_write_lock(drbg->lock))

        return 0;

    if (!ossl_prov_is_running()

        || !drbg_hmac_set_ctx_params_locked(drbg, &p))

        goto err;

    ret = ossl_prov_drbg_instantiate(drbg, strength, prediction_resistance,

        pstr, pstr_len);

err:

    if (drbg->lock != NULL)

        CRYPTO_THREAD_unlock(drbg->lock);

    return ret;

}

/*

 * SP800-90Ar1 10.1.2.4 HMAC_DRBG_Reseed_Process:

 *

 * Reseeds the drbg's Key (K) and Value (V) by calling

 * (K,V) = drbg_hmac_update() with the following input parameters:

 *   ent = entropy input data (Can be NULL) of length ent_len.

 *   adin = additional input data (Can be NULL) of length adin_len.

 *

 * Returns zero if an error occurs otherwise it returns 1.

 */

static int drbg_hmac_reseed(PROV_DRBG *drbg,

    const unsigned char *ent, size_t ent_len,

    const unsigned char *adin, size_t adin_len)

{

    PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)drbg->data;

    /* (Step 2) (K,V) = HMAC_DRBG_Update(entropy||additional_input, K, V) */

    return drbg_hmac_update(hmac, ent, ent_len, adin, adin_len, NULL, 0);

}

static int drbg_hmac_reseed_wrapper(void *vdrbg, int prediction_resistance,

    const unsigned char *ent, size_t ent_len,

    const unsigned char *adin, size_t adin_len)

{

    PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;

    return ossl_prov_drbg_reseed(drbg, prediction_resistance, ent, ent_len,

        adin, adin_len);

}

/*

 * SP800-90Ar1 10.1.2.5 HMAC_DRBG_Generate_Process:

 *

 * Generates pseudo random bytes and updates the internal K,V for the drbg.

 * out is a buffer to fill with outlen bytes of pseudo random data.

 * adin is an additional_input string of size adin_len that may be NULL.

 *

 * Returns zero if an error occurs otherwise it returns 1.

 */

int ossl_drbg_hmac_generate(PROV_DRBG_HMAC *hmac,

    unsigned char *out, size_t outlen,

    const unsigned char *adin, size_t adin_len)

{

    EVP_MAC_CTX *ctx = hmac->ctx;

    const unsigned char *temp = hmac->V;

    /* (Step 2) if adin != NULL then (K,V) = HMAC_DRBG_Update(adin, K, V) */

    if (adin != NULL

        && adin_len > 0

        && !drbg_hmac_update(hmac, adin, adin_len, NULL, 0, NULL, 0))

        return 0;

    /*

     * (Steps 3-5) temp = NULL

     *             while (len(temp) < outlen) {

     *                 V = HMAC(K, V)

     *                 temp = temp || V

     *             }

     */

    for (;;) {

        if (!EVP_MAC_init(ctx, hmac->K, hmac->blocklen, NULL)

            || !EVP_MAC_update(ctx, temp, hmac->blocklen))

            return 0;

        if (outlen > hmac->blocklen) {

            if (!EVP_MAC_final(ctx, out, NULL, outlen))

                return 0;

            temp = out;

        } else {

            if (!EVP_MAC_final(ctx, hmac->V, NULL, sizeof(hmac->V)))

                return 0;

            memcpy(out, hmac->V, outlen);

            break;

        }

        out += hmac->blocklen;

        outlen -= hmac->blocklen;

    }

    /* (Step 6) (K,V) = HMAC_DRBG_Update(adin, K, V) */

    if (!drbg_hmac_update(hmac, adin, adin_len, NULL, 0, NULL, 0))

        return 0;

    return 1;

}

static int drbg_hmac_generate(PROV_DRBG *drbg,

    unsigned char *out, size_t outlen,

    const unsigned char *adin, size_t adin_len)

{

    return ossl_drbg_hmac_generate((PROV_DRBG_HMAC *)drbg->data, out, outlen,

        adin, adin_len);

}

static int drbg_hmac_generate_wrapper(void *vdrbg,

    unsigned char *out, size_t outlen, unsigned int strength,

    int prediction_resistance, const unsigned char *adin, size_t adin_len)

{

    PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;

    return ossl_prov_drbg_generate(drbg, out, outlen, strength,

        prediction_resistance, adin, adin_len);

}

static int drbg_hmac_uninstantiate(PROV_DRBG *drbg)

{

    PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)drbg->data;

    OPENSSL_cleanse(hmac->K, sizeof(hmac->K));

    OPENSSL_cleanse(hmac->V, sizeof(hmac->V));

    return ossl_prov_drbg_uninstantiate(drbg);

}

static int drbg_hmac_uninstantiate_wrapper(void *vdrbg)

{

    PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;

    int ret;

    if (drbg->lock != NULL && !CRYPTO_THREAD_write_lock(drbg->lock))

        return 0;

    ret = drbg_hmac_uninstantiate(drbg);

    if (drbg->lock != NULL)

        CRYPTO_THREAD_unlock(drbg->lock);

    return ret;

}

static int drbg_hmac_verify_zeroization(void *vdrbg)

{

    PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;

    PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)drbg->data;

    int ret = 0;

    if (drbg->lock != NULL && !CRYPTO_THREAD_read_lock(drbg->lock))

        return 0;

    PROV_DRBG_VERIFY_ZEROIZATION(hmac->K);

    PROV_DRBG_VERIFY_ZEROIZATION(hmac->V);

    ret = 1;

err:

    if (drbg->lock != NULL)

        CRYPTO_THREAD_unlock(drbg->lock);

    return ret;

}

static int drbg_hmac_new(PROV_DRBG *drbg)

{

    PROV_DRBG_HMAC *hmac;

    hmac = OPENSSL_secure_zalloc(sizeof(*hmac));

    if (hmac == NULL)

        return 0;

    OSSL_FIPS_IND_INIT(drbg)

    drbg->data = hmac;

    /* See SP800-57 Part1 Rev4 5.6.1 Table 3 */

    drbg->max_entropylen = DRBG_MAX_LENGTH;

    drbg->max_noncelen = DRBG_MAX_LENGTH;

    drbg->max_perslen = DRBG_MAX_LENGTH;

    drbg->max_adinlen = DRBG_MAX_LENGTH;

    /* Maximum number of bits per request = 2^19  = 2^16 bytes */

    drbg->max_request = 1 << 16;

    return 1;

}

static void *drbg_hmac_new_wrapper(void *provctx, void *parent,

    const OSSL_DISPATCH *parent_dispatch)

{

    return ossl_rand_drbg_new(provctx, parent, parent_dispatch,

        &drbg_hmac_new, &drbg_hmac_free,

        &drbg_hmac_instantiate, &drbg_hmac_uninstantiate,

        &drbg_hmac_reseed, &drbg_hmac_generate);

}

static void drbg_hmac_free(void *vdrbg)

{

    PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;

    PROV_DRBG_HMAC *hmac;

    if (drbg != NULL && (hmac = (PROV_DRBG_HMAC *)drbg->data) != NULL) {

        EVP_MAC_CTX_free(hmac->ctx);

        ossl_prov_digest_reset(&hmac->digest);

        OPENSSL_secure_clear_free(hmac, sizeof(*hmac));

    }

    ossl_rand_drbg_free(drbg);

}

#define drbg_hmac_get_ctx_params_st drbg_get_ctx_params_st

/* clang-format off */

/* Machine generated by util/perl/OpenSSL/paramnames.pm */

#ifndef drbg_hmac_get_ctx_params_list

static const OSSL_PARAM drbg_hmac_get_ctx_params_list[] = {

    OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_MAC, NULL, 0),

    OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_DIGEST, NULL, 0),

    OSSL_PARAM_int(OSSL_RAND_PARAM_STATE, NULL),

    OSSL_PARAM_uint(OSSL_RAND_PARAM_STRENGTH, NULL),

    OSSL_PARAM_size_t(OSSL_RAND_PARAM_MAX_REQUEST, NULL),

    OSSL_PARAM_size_t(OSSL_DRBG_PARAM_MIN_ENTROPYLEN, NULL),

    OSSL_PARAM_size_t(OSSL_DRBG_PARAM_MAX_ENTROPYLEN, NULL),

    OSSL_PARAM_size_t(OSSL_DRBG_PARAM_MIN_NONCELEN, NULL),

    OSSL_PARAM_size_t(OSSL_DRBG_PARAM_MAX_NONCELEN, NULL),

    OSSL_PARAM_size_t(OSSL_DRBG_PARAM_MAX_PERSLEN, NULL),

    OSSL_PARAM_size_t(OSSL_DRBG_PARAM_MAX_ADINLEN, NULL),

    OSSL_PARAM_uint(OSSL_DRBG_PARAM_RESEED_COUNTER, NULL),

    OSSL_PARAM_time_t(OSSL_DRBG_PARAM_RESEED_TIME, NULL),

    OSSL_PARAM_uint(OSSL_DRBG_PARAM_RESEED_REQUESTS, NULL),

    OSSL_PARAM_uint64(OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL, NULL),

# if defined(FIPS_MODULE)

    OSSL_PARAM_int(OSSL_KDF_PARAM_FIPS_APPROVED_INDICATOR, NULL),

# endif

    OSSL_PARAM_END

};

#endif

#ifndef drbg_hmac_get_ctx_params_st

struct drbg_hmac_get_ctx_params_st {

    OSSL_PARAM *digest;

# if defined(FIPS_MODULE)

    OSSL_PARAM *ind;

# endif

    OSSL_PARAM *mac;

    OSSL_PARAM *maxadlen;

    OSSL_PARAM *maxentlen;

    OSSL_PARAM *maxnonlen;

    OSSL_PARAM *maxperlen;

    OSSL_PARAM *maxreq;

    OSSL_PARAM *minentlen;

    OSSL_PARAM *minnonlen;

    OSSL_PARAM *reseed_cnt;

    OSSL_PARAM *reseed_int;

    OSSL_PARAM *reseed_req;

    OSSL_PARAM *reseed_time;

    OSSL_PARAM *state;

    OSSL_PARAM *str;

};

#endif

#ifndef drbg_hmac_get_ctx_params_decoder

static int drbg_hmac_get_ctx_params_decoder

    (const OSSL_PARAM *p, struct drbg_hmac_get_ctx_params_st *r)

{

    const char *s;

    memset(r, 0, sizeof(*r));

    if (p != NULL)

        for (; (s = p->key) != NULL; p++)

            switch(s[0]) {

            default:

                break;

            case 'd':

                if (ossl_likely(strcmp("igest", s + 1) == 0)) {

                    /* OSSL_DRBG_PARAM_DIGEST */

                    if (ossl_unlikely(r->digest != NULL)) {

                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                       "param %s is repeated", s);

                        return 0;

                    }

                    r->digest = (OSSL_PARAM *)p;

                }

                break;

            case 'f':

# if defined(FIPS_MODULE)

                if (ossl_likely(strcmp("ips-indicator", s + 1) == 0)) {

                    /* OSSL_KDF_PARAM_FIPS_APPROVED_INDICATOR */

                    if (ossl_unlikely(r->ind != NULL)) {

                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                       "param %s is repeated", s);

                        return 0;

                    }

                    r->ind = (OSSL_PARAM *)p;

                }

# endif

                break;

            case 'm':

                switch(s[1]) {

                default:

                    break;

                case 'a':

                    switch(s[2]) {

                    default:

                        break;

                    case 'c':

                        switch(s[3]) {

                        default:

                            break;

                        case '\0':

                            if (ossl_unlikely(r->mac != NULL)) {

                                ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                               "param %s is repeated", s);

                                return 0;

                            }

                            r->mac = (OSSL_PARAM *)p;

                        }

                        break;

                    case 'x':

                        switch(s[3]) {

                        default:

                            break;

                        case '_':

                            switch(s[4]) {

                            default:

                                break;

                            case 'a':

                                if (ossl_likely(strcmp("dinlen", s + 5) == 0)) {

                                    /* OSSL_DRBG_PARAM_MAX_ADINLEN */

                                    if (ossl_unlikely(r->maxadlen != NULL)) {

                                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                                       "param %s is repeated", s);

                                        return 0;

                                    }

                                    r->maxadlen = (OSSL_PARAM *)p;

                                }

                                break;

                            case 'e':

                                if (ossl_likely(strcmp("ntropylen", s + 5) == 0)) {

                                    /* OSSL_DRBG_PARAM_MAX_ENTROPYLEN */

                                    if (ossl_unlikely(r->maxentlen != NULL)) {

                                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                                       "param %s is repeated", s);

                                        return 0;

                                    }

                                    r->maxentlen = (OSSL_PARAM *)p;

                                }

                                break;

                            case 'n':

                                if (ossl_likely(strcmp("oncelen", s + 5) == 0)) {

                                    /* OSSL_DRBG_PARAM_MAX_NONCELEN */

                                    if (ossl_unlikely(r->maxnonlen != NULL)) {

                                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                                       "param %s is repeated", s);

                                        return 0;

                                    }

                                    r->maxnonlen = (OSSL_PARAM *)p;

                                }

                                break;

                            case 'p':

                                if (ossl_likely(strcmp("erslen", s + 5) == 0)) {

                                    /* OSSL_DRBG_PARAM_MAX_PERSLEN */

                                    if (ossl_unlikely(r->maxperlen != NULL)) {

                                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                                       "param %s is repeated", s);

                                        return 0;

                                    }

                                    r->maxperlen = (OSSL_PARAM *)p;

                                }

                                break;

                            case 'r':

                                if (ossl_likely(strcmp("equest", s + 5) == 0)) {

                                    /* OSSL_RAND_PARAM_MAX_REQUEST */

                                    if (ossl_unlikely(r->maxreq != NULL)) {

                                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                                       "param %s is repeated", s);

                                        return 0;

                                    }

                                    r->maxreq = (OSSL_PARAM *)p;

                                }

                            }

                        }

                    }

                    break;

                case 'i':

                    switch(s[2]) {

                    default:

                        break;

                    case 'n':

                        switch(s[3]) {

                        default:

                            break;

                        case '_':

                            switch(s[4]) {

                            default:

                                break;

                            case 'e':

                                if (ossl_likely(strcmp("ntropylen", s + 5) == 0)) {

                                    /* OSSL_DRBG_PARAM_MIN_ENTROPYLEN */

                                    if (ossl_unlikely(r->minentlen != NULL)) {

                                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                                       "param %s is repeated", s);

                                        return 0;

                                    }

                                    r->minentlen = (OSSL_PARAM *)p;

                                }

                                break;

                            case 'n':

                                if (ossl_likely(strcmp("oncelen", s + 5) == 0)) {

                                    /* OSSL_DRBG_PARAM_MIN_NONCELEN */

                                    if (ossl_unlikely(r->minnonlen != NULL)) {

                                        ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                                       "param %s is repeated", s);

                                        return 0;

                                    }

                                    r->minnonlen = (OSSL_PARAM *)p;

                                }

                            }

                        }

                    }

                }

                break;

            case 'r':

                switch(s[1]) {

                default:

                    break;

                case 'e':

                    switch(s[2]) {

                    default:

                        break;

                    case 's':

                        switch(s[3]) {

                        default:

                            break;

                        case 'e':

                            switch(s[4]) {

                            default:

                                break;

                            case 'e':

                                switch(s[5]) {

                                default:

                                    break;

                                case 'd':

                                    switch(s[6]) {

                                    default:

                                        break;

                                    case '_':

                                        switch(s[7]) {

                                        default:

                                            break;

                                        case 'c':

                                            if (ossl_likely(strcmp("ounter", s + 8) == 0)) {

                                                /* OSSL_DRBG_PARAM_RESEED_COUNTER */

                                                if (ossl_unlikely(r->reseed_cnt != NULL)) {

                                                    ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                                                   "param %s is repeated", s);

                                                    return 0;

                                                }

                                                r->reseed_cnt = (OSSL_PARAM *)p;

                                            }

                                            break;

                                        case 'r':

                                            if (ossl_likely(strcmp("equests", s + 8) == 0)) {

                                                /* OSSL_DRBG_PARAM_RESEED_REQUESTS */

                                                if (ossl_unlikely(r->reseed_req != NULL)) {

                                                    ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                                                   "param %s is repeated", s);

                                                    return 0;

                                                }

                                                r->reseed_req = (OSSL_PARAM *)p;

                                            }

                                            break;

                                        case 't':

                                            switch(s[8]) {

                                            default:

                                                break;

                                            case 'i':

                                                switch(s[9]) {

                                                default:

                                                    break;

                                                case 'm':

                                                    switch(s[10]) {

                                                    default:

                                                        break;

                                                    case 'e':

                                                        switch(s[11]) {

                                                        default:

                                                            break;

                                                        case '_':

                                                            if (ossl_likely(strcmp("interval", s + 12) == 0)) {

                                                                /* OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL */

                                                                if (ossl_unlikely(r->reseed_int != NULL)) {

                                                                    ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                                                                   "param %s is repeated", s);

                                                                    return 0;

                                                                }

                                                                r->reseed_int = (OSSL_PARAM *)p;

                                                            }

                                                            break;

                                                        case '\0':

                                                            if (ossl_unlikely(r->reseed_time != NULL)) {

                                                                ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                                                               "param %s is repeated", s);

                                                                return 0;

                                                            }

                                                            r->reseed_time = (OSSL_PARAM *)p;

                                                        }

                                                    }

                                                }

                                            }

                                        }

                                    }

                                }

                            }

                        }

                    }

                }

                break;

            case 's':

                switch(s[1]) {

                default:

                    break;

                case 't':

                    switch(s[2]) {

                    default:

                        break;

                    case 'a':

                        if (ossl_likely(strcmp("te", s + 3) == 0)) {

                            /* OSSL_RAND_PARAM_STATE */

                            if (ossl_unlikely(r->state != NULL)) {

                                ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                               "param %s is repeated", s);

                                return 0;

                            }

                            r->state = (OSSL_PARAM *)p;

                        }

                        break;

                    case 'r':

                        if (ossl_likely(strcmp("ength", s + 3) == 0)) {

                            /* OSSL_RAND_PARAM_STRENGTH */

                            if (ossl_unlikely(r->str != NULL)) {

                                ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                               "param %s is repeated", s);

                                return 0;

                            }

                            r->str = (OSSL_PARAM *)p;

                        }

                    }

                }

            }

    return 1;

}

#endif

/* End of machine generated */

/* clang-format on */

static int drbg_hmac_get_ctx_params(void *vdrbg, OSSL_PARAM params[])

{

    PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;

    PROV_DRBG_HMAC *hmac;

    const char *name;

    const EVP_MD *md;

    struct drbg_get_ctx_params_st p;

    int ret = 0, complete = 0;

    if (drbg == NULL || !drbg_hmac_get_ctx_params_decoder(params, &p))

        return 0;

    if (!ossl_drbg_get_ctx_params_no_lock(drbg, &p, params, &complete))

        return 0;

    if (complete)

        return 1;

    hmac = (PROV_DRBG_HMAC *)drbg->data;

    if (drbg->lock != NULL && !CRYPTO_THREAD_read_lock(drbg->lock))

        return 0;

    if (p.mac != NULL) {

        if (hmac->ctx == NULL)

            goto err;

        name = EVP_MAC_get0_name(EVP_MAC_CTX_get0_mac(hmac->ctx));

        if (!OSSL_PARAM_set_utf8_string(p.mac, name))

            goto err;

    }

    if (p.digest != NULL) {

        md = ossl_prov_digest_md(&hmac->digest);

        if (md == NULL

            || !OSSL_PARAM_set_utf8_string(p.digest, EVP_MD_get0_name(md)))

            goto err;

    }

    ret = ossl_drbg_get_ctx_params(drbg, &p);

err:

    if (drbg->lock != NULL)

        CRYPTO_THREAD_unlock(drbg->lock);

    return ret;

}

static const OSSL_PARAM *drbg_hmac_gettable_ctx_params(ossl_unused void *vctx,

    ossl_unused void *p_ctx)

{

    return drbg_hmac_get_ctx_params_list;

}

static int drbg_fetch_algs_from_prov(const struct drbg_set_ctx_params_st *p,

    OSSL_LIB_CTX *libctx,

    EVP_MAC_CTX **macctx,

    EVP_MD **digest)

{

    OSSL_PROVIDER *prov = NULL;

    EVP_MD *md = NULL;

    EVP_MAC *mac = NULL;

    int ret = 0;

    if (macctx == NULL || digest == NULL)

        return 0;

    if (p->prov == NULL || p->prov->data_type != OSSL_PARAM_UTF8_STRING)

        return 0;

    if ((prov = ossl_provider_find(libctx, (const char *)p->prov->data, 1)) == NULL)

        return 0;

    if (p->digest != NULL) {

        if (p->digest->data_type != OSSL_PARAM_UTF8_STRING)

            goto done;

        md = evp_digest_fetch_from_prov(prov, (const char *)p->digest->data, NULL);

        if (md) {

            EVP_MD_free(*digest);

            *digest = md;

        } else {

            goto done;

        }

    }

    if (p->mac == NULL) {

        ret = 1;

        goto done;

    }

    if (p->mac->data_type != OSSL_PARAM_UTF8_STRING)

        goto done;

    EVP_MAC_CTX_free(*macctx);

    *macctx = NULL;

    mac = evp_mac_fetch_from_prov(prov, (const char *)p->mac->data, NULL);

    if (mac) {

        *macctx = EVP_MAC_CTX_new(mac);

        /* The context holds on to the MAC */

        EVP_MAC_free(mac);

        ret = 1;

    }

done:

    ossl_provider_free(prov);

    return ret;

}

static int drbg_hmac_set_ctx_params_locked(PROV_DRBG *ctx, const struct drbg_set_ctx_params_st *p)

{

    PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)ctx->data;

    OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx);

    EVP_MD *prov_md = NULL;

    const EVP_MD *md;

    int md_size;

    if (!OSSL_FIPS_IND_SET_CTX_FROM_PARAM(ctx, OSSL_FIPS_IND_SETTABLE0, p->ind_d))

        return 0;

    /* try to fetch mac and digest from provider */

    (void)ERR_set_mark();

    if (!drbg_fetch_algs_from_prov(p, libctx, &hmac->ctx, &prov_md)) {

        (void)ERR_pop_to_mark();

        /* fall back to full implementation search */

        if (!ossl_prov_digest_load(&hmac->digest, p->digest, p->propq,

                p->engine, libctx))

            return 0;

        if (!ossl_prov_macctx_load(&hmac->ctx, p->mac, NULL, p->digest,

                p->propq, p->engine,

                NULL, NULL, NULL, libctx))

            return 0;

    } else {

        (void)ERR_clear_last_mark();

        if (prov_md)

            ossl_prov_digest_set_md(&hmac->digest, prov_md);

        if (!ossl_prov_macctx_load(&hmac->ctx, p->mac, NULL, p->digest,

                p->propq, p->engine,

                NULL, NULL, NULL, libctx))

            return 0;

    }

    md = ossl_prov_digest_md(&hmac->digest);

    if (md != NULL && !ossl_drbg_verify_digest(ctx, libctx, md))

        return 0; /* Error already raised for us */

    if (md != NULL && hmac->ctx != NULL) {

        /* These are taken from SP 800-90 10.1 Table 2 */

        md_size = EVP_MD_get_size(md);

        if (md_size <= 0)

            return 0;

        hmac->blocklen = (size_t)md_size;

        /* See SP800-57 Part1 Rev4 5.6.1 Table 3 */

        ctx->strength = 64 * (int)(hmac->blocklen >> 3);

        if (ctx->strength > 256)

            ctx->strength = 256;

        ctx->seedlen = hmac->blocklen;

        ctx->min_entropylen = ctx->strength / 8;

        ctx->min_noncelen = ctx->min_entropylen / 2;

    }

    return ossl_drbg_set_ctx_params(ctx, p);

}

#define drbg_hmac_set_ctx_params_st drbg_set_ctx_params_st

/* clang-format off */

/* Machine generated by util/perl/OpenSSL/paramnames.pm */

#ifndef drbg_hmac_set_ctx_params_list

static const OSSL_PARAM drbg_hmac_set_ctx_params_list[] = {

    OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_PROPERTIES, NULL, 0),

    OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_DIGEST, NULL, 0),

    OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_MAC, NULL, 0),

    OSSL_PARAM_utf8_string(OSSL_PROV_PARAM_CORE_PROV_NAME, NULL, 0),

    OSSL_PARAM_uint(OSSL_DRBG_PARAM_RESEED_REQUESTS, NULL),

    OSSL_PARAM_uint64(OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL, NULL),

# if defined(FIPS_MODULE)

    OSSL_PARAM_int(OSSL_KDF_PARAM_FIPS_DIGEST_CHECK, NULL),

# endif

    OSSL_PARAM_END

};

#endif

#ifndef drbg_hmac_set_ctx_params_st

struct drbg_hmac_set_ctx_params_st {

    OSSL_PARAM *digest;

    OSSL_PARAM *engine;

# if defined(FIPS_MODULE)

    OSSL_PARAM *ind_d;

# endif

    OSSL_PARAM *mac;

    OSSL_PARAM *propq;

    OSSL_PARAM *prov;

    OSSL_PARAM *reseed_req;

    OSSL_PARAM *reseed_time;

};

#endif

#ifndef drbg_hmac_set_ctx_params_decoder

static int drbg_hmac_set_ctx_params_decoder

    (const OSSL_PARAM *p, struct drbg_hmac_set_ctx_params_st *r)

{

    const char *s;

    memset(r, 0, sizeof(*r));

    if (p != NULL)

        for (; (s = p->key) != NULL; p++)

            switch(s[0]) {

            default:

                break;

            case 'd':

                switch(s[1]) {

                default:

                    break;

                case 'i':

                    switch(s[2]) {

                    default:

                        break;

                    case 'g':

                        switch(s[3]) {

                        default:

                            break;

                        case 'e':

                            switch(s[4]) {

                            default:

                                break;

                            case 's':

                                switch(s[5]) {

                                default:

                                    break;

                                case 't':

                                    switch(s[6]) {

                                    default:

                                        break;

                                    case '-':

# if defined(FIPS_MODULE)

                                        if (ossl_likely(strcmp("check", s + 7) == 0)) {

                                            /* OSSL_KDF_PARAM_FIPS_DIGEST_CHECK */

                                            if (ossl_unlikely(r->ind_d != NULL)) {

                                                ERR_raise_data(ERR_LIB_PROV, PROV_R_REPEATED_PARAMETER,

                                                               "param %s is repeated", s);

                                                return 0;