/*

 * Copyright 2020-2021 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

 */

/* We need to use some engine and HMAC deprecated APIs */

#define OPENSSL_SUPPRESS_DEPRECATED

#include <openssl/engine.h>

#include "ssl_local.h"

/*

 * Engine APIs are only used to support applications that still use ENGINEs.

 * Once ENGINE is removed completely, all of this code can also be removed.

 */

#ifndef OPENSSL_NO_ENGINE

void tls_engine_finish(ENGINE *e)

{

    ENGINE_finish(e);

}

#endif

const EVP_CIPHER *tls_get_cipher_from_engine(int nid)

{

    const EVP_CIPHER *ret = NULL;

#ifndef OPENSSL_NO_ENGINE

    ENGINE *eng;

    /*

     * If there is an Engine available for this cipher we use the "implicit"

     * form to ensure we use that engine later.

     */

    eng = ENGINE_get_cipher_engine(nid);

    if (eng != NULL) {

        ret = ENGINE_get_cipher(eng, nid);

        ENGINE_finish(eng);

    }

#endif

    return ret;

}

const EVP_MD *tls_get_digest_from_engine(int nid)

{

    const EVP_MD *ret = NULL;

#ifndef OPENSSL_NO_ENGINE

    ENGINE *eng;

    /*

     * If there is an Engine available for this digest we use the "implicit"

     * form to ensure we use that engine later.

     */

    eng = ENGINE_get_digest_engine(nid);

    if (eng != NULL) {

        ret = ENGINE_get_digest(eng, nid);

        ENGINE_finish(eng);

    }

#endif

    return ret;

}

#ifndef OPENSSL_NO_ENGINE

int tls_engine_load_ssl_client_cert(SSL_CONNECTION *s, X509 **px509,

                                    EVP_PKEY **ppkey)

{

    SSL *ssl = SSL_CONNECTION_GET_SSL(s);

    return ENGINE_load_ssl_client_cert(SSL_CONNECTION_GET_CTX(s)->client_cert_engine,

                                       ssl,

                                       SSL_get_client_CA_list(ssl),

                                       px509, ppkey, NULL, NULL, NULL);

}

#endif

#ifndef OPENSSL_NO_ENGINE

int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e)

{

    if (!ENGINE_init(e)) {

        ERR_raise(ERR_LIB_SSL, ERR_R_ENGINE_LIB);

        return 0;

    }

    if (!ENGINE_get_ssl_client_cert_function(e)) {

        ERR_raise(ERR_LIB_SSL, SSL_R_NO_CLIENT_CERT_METHOD);

        ENGINE_finish(e);

        return 0;

    }

    ctx->client_cert_engine = e;

    return 1;

}

#endif

/*

 * The HMAC APIs below are only used to support the deprecated public API

 * macro SSL_CTX_set_tlsext_ticket_key_cb(). The application supplied callback

 * takes an HMAC_CTX in its argument list. The preferred alternative is

 * SSL_CTX_set_tlsext_ticket_key_evp_cb(). Once

 * SSL_CTX_set_tlsext_ticket_key_cb() is removed, then all of this code can also

 * be removed.

 */

#ifndef OPENSSL_NO_DEPRECATED_3_0

int ssl_hmac_old_new(SSL_HMAC *ret)

{

    ret->old_ctx = HMAC_CTX_new();

    if (ret->old_ctx == NULL)

        return 0;

    return 1;

}

void ssl_hmac_old_free(SSL_HMAC *ctx)

{

    HMAC_CTX_free(ctx->old_ctx);

}

int ssl_hmac_old_init(SSL_HMAC *ctx, void *key, size_t len, char *md)

{

    return HMAC_Init_ex(ctx->old_ctx, key, len, EVP_get_digestbyname(md), NULL);

}

int ssl_hmac_old_update(SSL_HMAC *ctx, const unsigned char *data, size_t len)

{

    return HMAC_Update(ctx->old_ctx, data, len);

}

int ssl_hmac_old_final(SSL_HMAC *ctx, unsigned char *md, size_t *len)

{

    unsigned int l;

    if (HMAC_Final(ctx->old_ctx, md, &l) > 0) {

        if (len != NULL)

            *len = l;

        return 1;

    }

    return 0;

}

size_t ssl_hmac_old_size(const SSL_HMAC *ctx)

{

    return HMAC_size(ctx->old_ctx);

}

HMAC_CTX *ssl_hmac_get0_HMAC_CTX(SSL_HMAC *ctx)

{

    return ctx->old_ctx;

}

/* Some deprecated public APIs pass DH objects */

EVP_PKEY *ssl_dh_to_pkey(DH *dh)

{

# ifndef OPENSSL_NO_DH

    EVP_PKEY *ret;

    if (dh == NULL)

        return NULL;

    ret = EVP_PKEY_new();

    if (EVP_PKEY_set1_DH(ret, dh) <= 0) {

        EVP_PKEY_free(ret);

        return NULL;

    }

    return ret;

# else

    return NULL;

# endif

}

/* Some deprecated public APIs pass EC_KEY objects */

int ssl_set_tmp_ecdh_groups(uint16_t **pext, size_t *pextlen,

                            void *key)

{

#  ifndef OPENSSL_NO_EC

    const EC_GROUP *group = EC_KEY_get0_group((const EC_KEY *)key);

    int nid;

    if (group == NULL) {

        ERR_raise(ERR_LIB_SSL, SSL_R_MISSING_PARAMETERS);

        return 0;

    }

    nid = EC_GROUP_get_curve_name(group);

    if (nid == NID_undef)

        return 0;

    return tls1_set_groups(pext, pextlen, &nid, 1);

#  else

    return 0;

#  endif

}

/*

 * Set the callback for generating temporary DH keys.

 * ctx: the SSL context.

 * dh: the callback

 */

# if !defined(OPENSSL_NO_DH)

void SSL_CTX_set_tmp_dh_callback(SSL_CTX *ctx,

                                 DH *(*dh) (SSL *ssl, int is_export,

                                            int keylength))

{

    SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_TMP_DH_CB, (void (*)(void))dh);

}

void SSL_set_tmp_dh_callback(SSL *ssl, DH *(*dh) (SSL *ssl, int is_export,

                                                  int keylength))

{

    SSL_callback_ctrl(ssl, SSL_CTRL_SET_TMP_DH_CB, (void (*)(void))dh);

}

# endif

#endif /* OPENSSL_NO_DEPRECATED */