Coverage Report

Created: 2025-07-18 06:12

/src/libzip/lib/zip_file_set_encryption.c
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/*
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  zip_file_set_encryption.c -- set encryption for file in archive
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  Copyright (C) 2016-2023 Dieter Baron and Thomas Klausner
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  This file is part of libzip, a library to manipulate ZIP archives.
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  The authors can be contacted at <info@libzip.org>
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  Redistribution and use in source and binary forms, with or without
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  modification, are permitted provided that the following conditions
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  are met:
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  1. Redistributions of source code must retain the above copyright
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     notice, this list of conditions and the following disclaimer.
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  2. Redistributions in binary form must reproduce the above copyright
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     notice, this list of conditions and the following disclaimer in
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     the documentation and/or other materials provided with the
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     distribution.
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  3. The names of the authors may not be used to endorse or promote
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     products derived from this software without specific prior
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     written permission.
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  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
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  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "zipint.h"
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#include <stdlib.h>
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#include <string.h>
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ZIP_EXTERN int
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zip_file_set_encryption(zip_t *za, zip_uint64_t idx, zip_uint16_t method, const char *password) {
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    zip_entry_t *e;
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    char *our_password = NULL;
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    if (idx >= za->nentry) {
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        zip_error_set(&za->error, ZIP_ER_INVAL, 0);
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        return -1;
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0
    }
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    if (ZIP_IS_RDONLY(za)) {
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        zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
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        return -1;
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0
    }
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    if (ZIP_WANT_TORRENTZIP(za)) {
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        zip_error_set(&za->error, ZIP_ER_NOT_ALLOWED, 0);
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        return -1;
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    }
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    if (method != ZIP_EM_NONE && _zip_get_encryption_implementation(method, ZIP_CODEC_ENCODE) == NULL) {
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        zip_error_set(&za->error, ZIP_ER_ENCRNOTSUPP, 0);
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        return -1;
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    }
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    e = za->entry + idx;
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    if (e->changes == NULL) {
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        if ((e->changes = _zip_dirent_clone(e->orig)) == NULL) {
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            zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
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            return -1;
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        }
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    }
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    if (password) {
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        if ((our_password = strdup(password)) == NULL) {
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            zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
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            return -1;
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        }
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    }
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    e->changes->encryption_method = method;
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    e->changes->changed |= ZIP_DIRENT_ENCRYPTION_METHOD;
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    if (password) {
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        e->changes->password = our_password;
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        e->changes->changed |= ZIP_DIRENT_PASSWORD;
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    }
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    else {
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        if (e->changes->changed & ZIP_DIRENT_PASSWORD) {
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            _zip_crypto_clear(e->changes->password, strlen(e->changes->password));
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            free(e->changes->password);
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            e->changes->password = e->orig ? e->orig->password : NULL;
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            e->changes->changed &= ~ZIP_DIRENT_PASSWORD;
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        }
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    }
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    return 0;
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}