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/*
 * Copyright 2016-2022 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 may obtain a copy of the License at
 * https://www.openssl.org/source/license.html
 * or in the file LICENSE in the source distribution.
 */

#include <stdio.h>
#include <string.h>
#include <errno.h>

#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/conf.h>
#include <openssl/err.h>
#include "testutil.h"

static int test_certs(int num)
{
    int c;
    char *name = 0;
    char *header = 0;
    unsigned char *data = 0;
    long len;
    typedef X509 *(*d2i_X509_t)(X509 **, const unsigned char **, long);
    typedef int (*i2d_X509_t)(const X509 *, unsigned char **);
    int err = 0;
    BIO *fp = BIO_new_file(test_get_argument(num), "r");

    if (!TEST_ptr(fp))
        return 0;

    for (c = 0; !err && PEM_read_bio(fp, &name, &header, &data, &len); ++c) {
        const int trusted = (strcmp(name, PEM_STRING_X509_TRUSTED) == 0);
        d2i_X509_t d2i = trusted ? d2i_X509_AUX : d2i_X509;
        i2d_X509_t i2d = trusted ? i2d_X509_AUX : i2d_X509;
        X509 *cert = NULL;
        X509 *reuse = NULL;
        const unsigned char *p = data;
        unsigned char *buf = NULL;
        unsigned char *bufp;
        long enclen;

        if (!trusted
            && strcmp(name, PEM_STRING_X509) != 0
            && strcmp(name, PEM_STRING_X509_OLD) != 0) {
            TEST_error("unexpected PEM object: %s", name);
            err = 1;
            goto next;
        }
        cert = d2i(NULL, &p, len);

        if (cert == NULL || (p - data) != len) {
            TEST_error("error parsing input %s", name);
            err = 1;
            goto next;
        }

        /* Test traditional 2-pass encoding into caller allocated buffer */
        enclen = i2d(cert, NULL);
        if (len != enclen) {
            TEST_error("encoded length %ld of %s != input length %ld",
                       enclen, name, len);
            err = 1;
            goto next;
        }
        if ((buf = bufp = OPENSSL_malloc(len)) == NULL) {
            TEST_perror("malloc");
            err = 1;
            goto next;
        }
        enclen = i2d(cert, &bufp);
        if (len != enclen) {
            TEST_error("encoded length %ld of %s != input length %ld",
                       enclen, name, len);
            err = 1;
            goto next;
        }
        enclen = (long) (bufp - buf);
        if (enclen != len) {
            TEST_error("unexpected buffer position after encoding %s", name);
            err = 1;
            goto next;
        }
        if (memcmp(buf, data, len) != 0) {
            TEST_error("encoded content of %s does not match input", name);
            err = 1;
            goto next;
        }
        p = buf;
        reuse = d2i(NULL, &p, enclen);
        if (reuse == NULL) {
            TEST_error("second d2i call failed for %s", name);
            err = 1;
            goto next;
        }
        err = X509_cmp(reuse, cert);
        if (err != 0) {
            TEST_error("X509_cmp for %s resulted in %d", name, err);
            err = 1;
            goto next;
        }
        OPENSSL_free(buf);
        buf = NULL;

        /* Test 1-pass encoding into library allocated buffer */
        enclen = i2d(cert, &buf);
        if (len != enclen) {
            TEST_error("encoded length %ld of %s != input length %ld",
                       enclen, name, len);
            err = 1;
            goto next;
        }
        if (memcmp(buf, data, len) != 0) {
            TEST_error("encoded content of %s does not match input", name);
            err = 1;
            goto next;
        }

        if (trusted) {
            /* Encode just the cert and compare with initial encoding */
            OPENSSL_free(buf);
            buf = NULL;

            /* Test 1-pass encoding into library allocated buffer */
            enclen = i2d(cert, &buf);
            if (enclen > len) {
                TEST_error("encoded length %ld of %s > input length %ld",
                           enclen, name, len);
                err = 1;
                goto next;
            }
            if (memcmp(buf, data, enclen) != 0) {
                TEST_error("encoded cert content does not match input");
                err = 1;
                goto next;
            }
        }

        /*
         * If any of these were null, PEM_read() would have failed.
         */
    next:
        X509_free(cert);
        X509_free(reuse);
        OPENSSL_free(buf);
        OPENSSL_free(name);
        OPENSSL_free(header);
        OPENSSL_free(data);
    }
    BIO_free(fp);

    if (ERR_GET_REASON(ERR_peek_last_error()) == PEM_R_NO_START_LINE) {
        /* Reached end of PEM file */
        if (c > 0) {
            ERR_clear_error();
            return 1;
        }
    }

    /* Some other PEM read error */
    return 0;
}

OPT_TEST_DECLARE_USAGE("certfile...\n")

int setup_tests(void)
{
    size_t n;

    if (!test_skip_common_options()) {
        TEST_error("Error parsing test options\n");
        return 0;
    }

    n = test_get_argument_count();
    if (n == 0)
        return 0;

    ADD_ALL_TESTS(test_certs, (int)n);
    return 1;
}

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