/*

 * Copyright 1995-2024 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 <stdio.h>

#include <openssl/evp.h>

#include <openssl/kdf.h>

#include <openssl/x509.h>

#include "internal/cryptlib.h"

#include "internal/namemap.h"

#include "crypto/objects.h"

#include "crypto/evp.h"

int EVP_add_cipher(const EVP_CIPHER *c)

{

    int r;

    if (c == NULL)

        return 0;

    r = OBJ_NAME_add(OBJ_nid2sn(c->nid), OBJ_NAME_TYPE_CIPHER_METH,

                     (const char *)c);

    if (r == 0)

        return 0;

    r = OBJ_NAME_add(OBJ_nid2ln(c->nid), OBJ_NAME_TYPE_CIPHER_METH,

                     (const char *)c);

    return r;

}

int EVP_add_digest(const EVP_MD *md)

{

    int r;

    const char *name;

    name = OBJ_nid2sn(md->type);

    r = OBJ_NAME_add(name, OBJ_NAME_TYPE_MD_METH, (const char *)md);

    if (r == 0)

        return 0;

    r = OBJ_NAME_add(OBJ_nid2ln(md->type), OBJ_NAME_TYPE_MD_METH,

                     (const char *)md);

    if (r == 0)

        return 0;

    if (md->pkey_type && md->type != md->pkey_type) {

        r = OBJ_NAME_add(OBJ_nid2sn(md->pkey_type),

                         OBJ_NAME_TYPE_MD_METH | OBJ_NAME_ALIAS, name);

        if (r == 0)

            return 0;

        r = OBJ_NAME_add(OBJ_nid2ln(md->pkey_type),

                         OBJ_NAME_TYPE_MD_METH | OBJ_NAME_ALIAS, name);

    }

    return r;

}

static void cipher_from_name(const char *name, void *data)

{

    const EVP_CIPHER **cipher = data;

    if (*cipher != NULL)

        return;

    *cipher = (const EVP_CIPHER *)OBJ_NAME_get(name, OBJ_NAME_TYPE_CIPHER_METH);

}

const EVP_CIPHER *EVP_get_cipherbyname(const char *name)

{

    return evp_get_cipherbyname_ex(NULL, name);

}

const EVP_CIPHER *evp_get_cipherbyname_ex(OSSL_LIB_CTX *libctx,

                                          const char *name)

{

    const EVP_CIPHER *cp;

    OSSL_NAMEMAP *namemap;

    int id;

    int do_retry = 1;

    if (!OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS, NULL))

        return NULL;

    cp = (const EVP_CIPHER *)OBJ_NAME_get(name, OBJ_NAME_TYPE_CIPHER_METH);

    if (cp != NULL)

        return cp;

    /*

     * It's not in the method database, but it might be there under a different

     * name. So we check for aliases in the EVP namemap and try all of those

     * in turn.

     */

    namemap = ossl_namemap_stored(libctx);

 retry:

    id = ossl_namemap_name2num(namemap, name);

    if (id == 0) {

        EVP_CIPHER *fetched_cipher;

        /* Try to fetch it because the name might not be known yet. */

        if (!do_retry)

            return NULL;

        do_retry = 0;

        ERR_set_mark();

        fetched_cipher = EVP_CIPHER_fetch(libctx, name, NULL);

        EVP_CIPHER_free(fetched_cipher);

        ERR_pop_to_mark();

        goto retry;

    }

    if (!ossl_namemap_doall_names(namemap, id, cipher_from_name, &cp))

        return NULL;

    return cp;

}

static void digest_from_name(const char *name, void *data)

{

    const EVP_MD **md = data;

    if (*md != NULL)

        return;

    *md = (const EVP_MD *)OBJ_NAME_get(name, OBJ_NAME_TYPE_MD_METH);

}

const EVP_MD *EVP_get_digestbyname(const char *name)

{

    return evp_get_digestbyname_ex(NULL, name);

}

const EVP_MD *evp_get_digestbyname_ex(OSSL_LIB_CTX *libctx, const char *name)

{

    const EVP_MD *dp;

    OSSL_NAMEMAP *namemap;

    int id;

    int do_retry = 1;

    if (!OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_DIGESTS, NULL))

        return NULL;

    dp = (const EVP_MD *)OBJ_NAME_get(name, OBJ_NAME_TYPE_MD_METH);

    if (dp != NULL)

        return dp;

    /*

     * It's not in the method database, but it might be there under a different

     * name. So we check for aliases in the EVP namemap and try all of those

     * in turn.

     */

    namemap = ossl_namemap_stored(libctx);

 retry:

    id = ossl_namemap_name2num(namemap, name);

    if (id == 0) {

        EVP_MD *fetched_md;

        /* Try to fetch it because the name might not be known yet. */

        if (!do_retry)

            return NULL;

        do_retry = 0;

        ERR_set_mark();

        fetched_md = EVP_MD_fetch(libctx, name, NULL);

        EVP_MD_free(fetched_md);

        ERR_pop_to_mark();

        goto retry;

    }

    if (!ossl_namemap_doall_names(namemap, id, digest_from_name, &dp))

        return NULL;

    return dp;

}

void evp_cleanup_int(void)

{

    OBJ_NAME_cleanup(OBJ_NAME_TYPE_KDF_METH);

    OBJ_NAME_cleanup(OBJ_NAME_TYPE_CIPHER_METH);

    OBJ_NAME_cleanup(OBJ_NAME_TYPE_MD_METH);

    /*

     * The above calls will only clean out the contents of the name hash

     * table, but not the hash table itself.  The following line does that

     * part.  -- Richard Levitte

     */

    OBJ_NAME_cleanup(-1);

    EVP_PBE_cleanup();

    OBJ_sigid_free();

    evp_app_cleanup_int();

}

struct doall_cipher {

    void *arg;

    void (*fn) (const EVP_CIPHER *ciph,

                const char *from, const char *to, void *arg);

};

static void do_all_cipher_fn(const OBJ_NAME *nm, void *arg)

{

    struct doall_cipher *dc = arg;

    if (nm->alias)

        dc->fn(NULL, nm->name, nm->data, dc->arg);

    else

        dc->fn((const EVP_CIPHER *)nm->data, nm->name, NULL, dc->arg);

}

void EVP_CIPHER_do_all(void (*fn) (const EVP_CIPHER *ciph,

                                   const char *from, const char *to, void *x),

                       void *arg)

{

    struct doall_cipher dc;

    /* Ignore errors */

    OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS, NULL);

    dc.fn = fn;

    dc.arg = arg;

    OBJ_NAME_do_all(OBJ_NAME_TYPE_CIPHER_METH, do_all_cipher_fn, &dc);

}

void EVP_CIPHER_do_all_sorted(void (*fn) (const EVP_CIPHER *ciph,

                                          const char *from, const char *to,

                                          void *x), void *arg)

{

    struct doall_cipher dc;

    /* Ignore errors */

    OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS, NULL);

    dc.fn = fn;

    dc.arg = arg;

    OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH, do_all_cipher_fn, &dc);

}

struct doall_md {

    void *arg;

    void (*fn) (const EVP_MD *ciph,

                const char *from, const char *to, void *arg);

};

static void do_all_md_fn(const OBJ_NAME *nm, void *arg)

{

    struct doall_md *dc = arg;

    if (nm->alias)

        dc->fn(NULL, nm->name, nm->data, dc->arg);

    else

        dc->fn((const EVP_MD *)nm->data, nm->name, NULL, dc->arg);

}

void EVP_MD_do_all(void (*fn) (const EVP_MD *md,

                               const char *from, const char *to, void *x),

                   void *arg)

{

    struct doall_md dc;

    /* Ignore errors */

    OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);

    dc.fn = fn;

    dc.arg = arg;

    OBJ_NAME_do_all(OBJ_NAME_TYPE_MD_METH, do_all_md_fn, &dc);

}

void EVP_MD_do_all_sorted(void (*fn) (const EVP_MD *md,

                                      const char *from, const char *to,

                                      void *x), void *arg)

{

    struct doall_md dc;

    OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);

    dc.fn = fn;

    dc.arg = arg;

    OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_MD_METH, do_all_md_fn, &dc);

}