/*

 * Copyright 2019-2025 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/evp.h>

#include <openssl/core_names.h>

#include <openssl/err.h>

#include <openssl/proverr.h>

#ifndef FIPS_MODULE

# include "crypto/evp.h"

#endif

#include "prov/providercommon.h"

#include "prov/provider_util.h"

void ossl_prov_cipher_reset(PROV_CIPHER *pc)

{

    EVP_CIPHER_free(pc->alloc_cipher);

    pc->alloc_cipher = NULL;

    pc->cipher = NULL;

}

int ossl_prov_cipher_copy(PROV_CIPHER *dst, const PROV_CIPHER *src)

{

    if (src->alloc_cipher != NULL && !EVP_CIPHER_up_ref(src->alloc_cipher))

        return 0;

    dst->cipher = src->cipher;

    dst->alloc_cipher = src->alloc_cipher;

    return 1;

}

static int set_propq(const OSSL_PARAM *propq, const char **propquery)

{

    *propquery = NULL;

    if (propq != NULL) {

        if (propq->data_type != OSSL_PARAM_UTF8_STRING)

            return 0;

        *propquery = propq->data;

    }

    return 1;

}

int ossl_prov_cipher_load(PROV_CIPHER *pc, const OSSL_PARAM *cipher,

                          const OSSL_PARAM *propq, OSSL_LIB_CTX *ctx)

{

    const char *propquery;

    if (!set_propq(propq, &propquery))

        return 0;

    if (cipher == NULL)

        return 1;

    if (cipher->data_type != OSSL_PARAM_UTF8_STRING)

        return 0;

    EVP_CIPHER_free(pc->alloc_cipher);

    ERR_set_mark();

    pc->cipher = pc->alloc_cipher = EVP_CIPHER_fetch(ctx, cipher->data,

                                                     propquery);

#ifndef FIPS_MODULE /* Inside the FIPS module, we don't support legacy ciphers */

    if (pc->cipher == NULL) {

        const EVP_CIPHER *evp_cipher;

        evp_cipher = EVP_get_cipherbyname(cipher->data);

        /* Do not use global EVP_CIPHERs */

        if (evp_cipher != NULL && evp_cipher->origin != EVP_ORIG_GLOBAL)

            pc->cipher = evp_cipher;

    }

#endif

    if (pc->cipher != NULL)

        ERR_pop_to_mark();

    else

        ERR_clear_last_mark();

    return pc->cipher != NULL;

}

const EVP_CIPHER *ossl_prov_cipher_cipher(const PROV_CIPHER *pc)

{

    return pc->cipher;

}

void ossl_prov_digest_reset(PROV_DIGEST *pd)

{

    EVP_MD_free(pd->alloc_md);

    pd->alloc_md = NULL;

    pd->md = NULL;

}

int ossl_prov_digest_copy(PROV_DIGEST *dst, const PROV_DIGEST *src)

{

    if (src->alloc_md != NULL && !EVP_MD_up_ref(src->alloc_md))

        return 0;

    dst->md = src->md;

    dst->alloc_md = src->alloc_md;

    return 1;

}

const EVP_MD *ossl_prov_digest_fetch(PROV_DIGEST *pd, OSSL_LIB_CTX *libctx,

                                     const char *mdname, const char *propquery)

{

    EVP_MD_free(pd->alloc_md);

    pd->md = pd->alloc_md = EVP_MD_fetch(libctx, mdname, propquery);

    return pd->md;

}

int ossl_prov_digest_load(PROV_DIGEST *pd, const OSSL_PARAM *digest,

                          const OSSL_PARAM *propq, OSSL_LIB_CTX *ctx)

{

    const char *propquery;

    if (!set_propq(propq, &propquery))

        return 0;

    if (digest == NULL)

        return 1;

    if (digest->data_type != OSSL_PARAM_UTF8_STRING)

        return 0;

    ERR_set_mark();

    ossl_prov_digest_fetch(pd, ctx, digest->data, propquery);

#ifndef FIPS_MODULE /* Inside the FIPS module, we don't support legacy digests */

    if (pd->md == NULL) {

        const EVP_MD *md;

        md = EVP_get_digestbyname(digest->data);

        /* Do not use global EVP_MDs */

        if (md != NULL && md->origin != EVP_ORIG_GLOBAL)

            pd->md = md;

    }

#endif

    if (pd->md != NULL)

        ERR_pop_to_mark();

    else

        ERR_clear_last_mark();

    return pd->md != NULL;

}

void ossl_prov_digest_set_md(PROV_DIGEST *pd, EVP_MD *md)

{

    ossl_prov_digest_reset(pd);

    pd->md = pd->alloc_md = md;

}

const EVP_MD *ossl_prov_digest_md(const PROV_DIGEST *pd)

{

    return pd->md;

}

int ossl_prov_set_macctx(EVP_MAC_CTX *macctx,

                         const char *ciphername,

                         const char *mdname,

                         const char *properties,

                         const OSSL_PARAM param[])

{

    OSSL_PARAM mac_params[5], *mp = mac_params, *mergep;

    int free_merge = 0;

    int ret;

    if (mdname != NULL)

        *mp++ = OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_DIGEST,

                                                 (char *)mdname, 0);

    if (ciphername != NULL)

        *mp++ = OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_CIPHER,

                                                 (char *)ciphername, 0);

    if (properties != NULL)

        *mp++ = OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_PROPERTIES,

                                                 (char *)properties, 0);

    *mp = OSSL_PARAM_construct_end();

    /*

     * OSSL_PARAM_merge returns NULL and sets an error if either

     * list passed to it is NULL, and we aren't guaranteed that the

     * passed in value of param is not NULL here.

     * Given that we just want the union of the two lists, even if one

     * is empty, we have to check for that case, and if param is NULL,

     * just use the mac_params list.  In turn we only free the merge

     * result if we actually did the merge

     */

    if (param == NULL) {

        mergep = mac_params;

    } else {

        free_merge = 1;

        mergep = OSSL_PARAM_merge(mac_params, param);

        if (mergep == NULL)

            return 0;

    }

    ret = EVP_MAC_CTX_set_params(macctx, mergep);

    if (free_merge == 1)

        OSSL_PARAM_free(mergep);

    return ret;

}

int ossl_prov_macctx_load(EVP_MAC_CTX **macctx,

                          const OSSL_PARAM *pmac, const OSSL_PARAM *pcipher,

                          const OSSL_PARAM *pdigest, const OSSL_PARAM *propq,

                          const char *macname, const char *ciphername,

                          const char *mdname, OSSL_LIB_CTX *libctx)

{

    const char *properties = NULL;

    if (macname == NULL && pmac != NULL)

        if (!OSSL_PARAM_get_utf8_string_ptr(pmac, &macname))

            return 0;

    if (propq != NULL && !OSSL_PARAM_get_utf8_string_ptr(propq, &properties))

        return 0;

    /* If we got a new mac name, we make a new EVP_MAC_CTX */

    if (macname != NULL) {

        EVP_MAC *mac = EVP_MAC_fetch(libctx, macname, properties);

        EVP_MAC_CTX_free(*macctx);

        *macctx = mac == NULL ? NULL : EVP_MAC_CTX_new(mac);

        /* The context holds on to the MAC */

        EVP_MAC_free(mac);

        if (*macctx == NULL)

            return 0;

    }

    /*

     * If there is no MAC yet (and therefore, no MAC context), we ignore

     * all other parameters.

     */

    if (*macctx == NULL)

        return 1;

    if (ciphername == NULL && pcipher != NULL)

        if (!OSSL_PARAM_get_utf8_string_ptr(pcipher, &ciphername))

            return 0;

    if (mdname == NULL && pdigest != NULL)

        if (!OSSL_PARAM_get_utf8_string_ptr(pdigest, &mdname))

            return 0;

    if (ossl_prov_set_macctx(*macctx, ciphername, mdname, properties, NULL))

        return 1;

    EVP_MAC_CTX_free(*macctx);

    *macctx = NULL;

    return 0;

}

void ossl_prov_cache_exported_algorithms(const OSSL_ALGORITHM_CAPABLE *in,

                                         OSSL_ALGORITHM *out)

{

    int i, j;

    if (out[0].algorithm_names == NULL) {

        for (i = j = 0; in[i].alg.algorithm_names != NULL; ++i) {

            if (in[i].capable == NULL || in[i].capable())

                out[j++] = in[i].alg;

        }

        out[j++] = in[i].alg;

    }

}

/* Duplicate a lump of memory safely */

int ossl_prov_memdup(const void *src, size_t src_len,

                     unsigned char **dest, size_t *dest_len)

{

    if (src != NULL) {

        if ((*dest = OPENSSL_memdup(src, src_len)) == NULL)

            return 0;

        *dest_len = src_len;

    } else {

        *dest = NULL;

        *dest_len = 0;

    }

    return 1;

}