/* crypto/x509/x509_cmp.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <ctype.h>
#include "cryptlib.h"
#include <openssl/asn1.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>

int X509_issuer_and_serial_cmp(const X509 *a, const X509 *b)
{
    int i;
    X509_CINF *ai, *bi;

    ai = a->cert_info;
    bi = b->cert_info;
    i = M_ASN1_INTEGER_cmp(ai->serialNumber, bi->serialNumber);
    if (i)
        return (i);
    return (X509_NAME_cmp(ai->issuer, bi->issuer));
}

#ifndef OPENSSL_NO_MD5
unsigned long X509_issuer_and_serial_hash(X509 *a)
{
    unsigned long ret = 0;
    EVP_MD_CTX ctx;
    unsigned char md[16];
    char *f;

    EVP_MD_CTX_init(&ctx);
    f = X509_NAME_oneline(a->cert_info->issuer, NULL, 0);
    ret = strlen(f);
    EVP_DigestInit_ex(&ctx, EVP_md5(), NULL);
    EVP_DigestUpdate(&ctx, (unsigned char *)f, ret);
    OPENSSL_free(f);
    EVP_DigestUpdate(&ctx, (unsigned char *)a->cert_info->serialNumber->data,
                     (unsigned long)a->cert_info->serialNumber->length);
    EVP_DigestFinal_ex(&ctx, &(md[0]), NULL);
    ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) |
           ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)
        ) & 0xffffffffL;
    EVP_MD_CTX_cleanup(&ctx);
    return (ret);
}
#endif

int X509_issuer_name_cmp(const X509 *a, const X509 *b)
{
    return (X509_NAME_cmp(a->cert_info->issuer, b->cert_info->issuer));
}

int X509_subject_name_cmp(const X509 *a, const X509 *b)
{
    return (X509_NAME_cmp(a->cert_info->subject, b->cert_info->subject));
}

int X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b)
{
    return (X509_NAME_cmp(a->crl->issuer, b->crl->issuer));
}

#ifndef OPENSSL_NO_SHA
int X509_CRL_match(const X509_CRL *a, const X509_CRL *b)
{
    return memcmp(a->sha1_hash, b->sha1_hash, 20);
}
#endif

X509_NAME *X509_get_issuer_name(X509 *a)
{
    return (a->cert_info->issuer);
}

unsigned long X509_issuer_name_hash(X509 *x)
{
    return (X509_NAME_hash(x->cert_info->issuer));
}

#ifndef OPENSSL_NO_MD5
unsigned long X509_issuer_name_hash_old(X509 *x)
{
    return (X509_NAME_hash_old(x->cert_info->issuer));
}
#endif

X509_NAME *X509_get_subject_name(X509 *a)
{
    return (a->cert_info->subject);
}

ASN1_INTEGER *X509_get_serialNumber(X509 *a)
{
    return (a->cert_info->serialNumber);
}

unsigned long X509_subject_name_hash(X509 *x)
{
    return (X509_NAME_hash(x->cert_info->subject));
}

#ifndef OPENSSL_NO_MD5
unsigned long X509_subject_name_hash_old(X509 *x)
{
    return (X509_NAME_hash_old(x->cert_info->subject));
}
#endif

#ifndef OPENSSL_NO_SHA
/*
 * Compare two certificates: they must be identical for this to work. NB:
 * Although "cmp" operations are generally prototyped to take "const"
 * arguments (eg. for use in STACKs), the way X509 handling is - these
 * operations may involve ensuring the hashes are up-to-date and ensuring
 * certain cert information is cached. So this is the point where the
 * "depth-first" constification tree has to halt with an evil cast.
 */
int X509_cmp(const X509 *a, const X509 *b)
{
    /* ensure hash is valid */
    X509_check_purpose((X509 *)a, -1, 0);
    X509_check_purpose((X509 *)b, -1, 0);

    return memcmp(a->sha1_hash, b->sha1_hash, SHA_DIGEST_LENGTH);
}
#endif

int X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b)
{
    int ret;

    /* Ensure canonical encoding is present and up to date */

    if (!a->canon_enc || a->modified) {
        ret = i2d_X509_NAME((X509_NAME *)a, NULL);
        if (ret < 0)
            return -2;
    }

    if (!b->canon_enc || b->modified) {
        ret = i2d_X509_NAME((X509_NAME *)b, NULL);
        if (ret < 0)
            return -2;
    }

    ret = a->canon_enclen - b->canon_enclen;

    if (ret)
        return ret;

    return memcmp(a->canon_enc, b->canon_enc, a->canon_enclen);

}

unsigned long X509_NAME_hash(X509_NAME *x)
{
    unsigned long ret = 0;
    unsigned char md[SHA_DIGEST_LENGTH];

    /* Make sure X509_NAME structure contains valid cached encoding */
    i2d_X509_NAME(x, NULL);
    EVP_Digest(x->canon_enc, x->canon_enclen, md, NULL, EVP_sha1(), NULL);

    ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) |
           ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)
        ) & 0xffffffffL;
    return (ret);
}

#ifndef OPENSSL_NO_MD5
/*
 * I now DER encode the name and hash it.  Since I cache the DER encoding,
 * this is reasonably efficient.
 */

unsigned long X509_NAME_hash_old(X509_NAME *x)
{
    unsigned long ret = 0;
    unsigned char md[16];

    /* Make sure X509_NAME structure contains valid cached encoding */
    i2d_X509_NAME(x, NULL);
    EVP_Digest(x->bytes->data, x->bytes->length, md, NULL, EVP_md5(), NULL);

    ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) |
           ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)
        ) & 0xffffffffL;
    return (ret);
}
#endif

/* Search a stack of X509 for a match */
X509 *X509_find_by_issuer_and_serial(STACK_OF(X509) *sk, X509_NAME *name,
                                     ASN1_INTEGER *serial)
{
    int i;
    X509_CINF cinf;
    X509 x, *x509 = NULL;

    if (!sk)
        return NULL;

    x.cert_info = &cinf;
    cinf.serialNumber = serial;
    cinf.issuer = name;

    for (i = 0; i < sk_X509_num(sk); i++) {
        x509 = sk_X509_value(sk, i);
        if (X509_issuer_and_serial_cmp(x509, &x) == 0)
            return (x509);
    }
    return (NULL);
}

X509 *X509_find_by_subject(STACK_OF(X509) *sk, X509_NAME *name)
{
    X509 *x509;
    int i;

    for (i = 0; i < sk_X509_num(sk); i++) {
        x509 = sk_X509_value(sk, i);
        if (X509_NAME_cmp(X509_get_subject_name(x509), name) == 0)
            return (x509);
    }
    return (NULL);
}

EVP_PKEY *X509_get_pubkey(X509 *x)
{
    if ((x == NULL) || (x->cert_info == NULL))
        return (NULL);
    return (X509_PUBKEY_get(x->cert_info->key));
}

ASN1_BIT_STRING *X509_get0_pubkey_bitstr(const X509 *x)
{
    if (!x)
        return NULL;
    return x->cert_info->key->public_key;
}

int X509_check_private_key(X509 *x, EVP_PKEY *k)
{
    EVP_PKEY *xk;
    int ret;

    xk = X509_get_pubkey(x);

    if (xk)
        ret = EVP_PKEY_cmp(xk, k);
    else
        ret = -2;

    switch (ret) {
    case 1:
        break;
    case 0:
        X509err(X509_F_X509_CHECK_PRIVATE_KEY, X509_R_KEY_VALUES_MISMATCH);
        break;
    case -1:
        X509err(X509_F_X509_CHECK_PRIVATE_KEY, X509_R_KEY_TYPE_MISMATCH);
        break;
    case -2:
        X509err(X509_F_X509_CHECK_PRIVATE_KEY, X509_R_UNKNOWN_KEY_TYPE);
    }
    if (xk)
        EVP_PKEY_free(xk);
    if (ret > 0)
        return 1;
    return 0;
}