/* 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>

EXPORT_C 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

EXPORT_C 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

EXPORT_C int X509_issuer_name_cmp(const X509 *a, const X509 *b)

	{

	return(X509_NAME_cmp(a->cert_info->issuer,b->cert_info->issuer));

	}

EXPORT_C int X509_subject_name_cmp(const X509 *a, const X509 *b)

	{

	return(X509_NAME_cmp(a->cert_info->subject,b->cert_info->subject));

	}

EXPORT_C int X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b)

	{

	return(X509_NAME_cmp(a->crl->issuer,b->crl->issuer));

	}

EXPORT_C X509_NAME *X509_get_issuer_name(X509 *a)

	{

	return(a->cert_info->issuer);

	}

EXPORT_C unsigned long X509_issuer_name_hash(X509 *x)

	{

	return(X509_NAME_hash(x->cert_info->issuer));

	}

EXPORT_C X509_NAME *X509_get_subject_name(X509 *a)

	{

	return(a->cert_info->subject);

	}

EXPORT_C ASN1_INTEGER *X509_get_serialNumber(X509 *a)

	{

	return(a->cert_info->serialNumber);

	}

EXPORT_C unsigned long X509_subject_name_hash(X509 *x)

	{

	return(X509_NAME_hash(x->cert_info->subject));

	}

#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.

 */

EXPORT_C 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

/* Case insensitive string comparision */

static int nocase_cmp(const ASN1_STRING *a, const ASN1_STRING *b)

{

	int i;

	if (a->length != b->length)

		return (a->length - b->length);

	for (i=0; i<a->length; i++)

	{

		int ca, cb;

		ca = tolower(a->data[i]);

		cb = tolower(b->data[i]);

		if (ca != cb)

			return(ca-cb);

	}

	return 0;

}

/* Case insensitive string comparision with space normalization 

 * Space normalization - ignore leading, trailing spaces, 

 *       multiple spaces between characters are replaced by single space  

 */

static int nocase_spacenorm_cmp(const ASN1_STRING *a, const ASN1_STRING *b)

{

	unsigned char *pa = NULL, *pb = NULL;

	int la, lb;

	la = a->length;

	lb = b->length;

	pa = a->data;

	pb = b->data;

	/* skip leading spaces */

	while (la > 0 && isspace(*pa))

	{

		la--;

		pa++;

	}

	while (lb > 0 && isspace(*pb))

	{

		lb--;

		pb++;

	}

	/* skip trailing spaces */

	while (la > 0 && isspace(pa[la-1]))

		la--;

	while (lb > 0 && isspace(pb[lb-1]))

		lb--;

	/* compare strings with space normalization */

	while (la > 0 && lb > 0)

	{

		int ca, cb;

		/* compare character */

		ca = tolower(*pa);

		cb = tolower(*pb);

		if (ca != cb)

			return (ca - cb);

		pa++; pb++;

		la--; lb--;

		if (la <= 0 || lb <= 0)

			break;

		/* is white space next character ? */

		if (isspace(*pa) && isspace(*pb))

		{

			/* skip remaining white spaces */

			while (la > 0 && isspace(*pa))

			{

				la--;

				pa++;

			}

			while (lb > 0 && isspace(*pb))

			{

				lb--;

				pb++;

			}

		}

	}

	if (la > 0 || lb > 0)

		return la - lb;

	return 0;

}

static int asn1_string_memcmp(ASN1_STRING *a, ASN1_STRING *b)

	{

	int j;

	j = a->length - b->length;

	if (j)

		return j;

	return memcmp(a->data, b->data, a->length);

	}

#define STR_TYPE_CMP (B_ASN1_PRINTABLESTRING|B_ASN1_T61STRING|B_ASN1_UTF8STRING)

EXPORT_C int X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b)

	{

	int i,j;

	X509_NAME_ENTRY *na,*nb;

	unsigned long nabit, nbbit;

	j = sk_X509_NAME_ENTRY_num(a->entries)

		  - sk_X509_NAME_ENTRY_num(b->entries);

	if (j)

		return j;

	for (i=sk_X509_NAME_ENTRY_num(a->entries)-1; i>=0; i--)

		{

		na=sk_X509_NAME_ENTRY_value(a->entries,i);

		nb=sk_X509_NAME_ENTRY_value(b->entries,i);

		j=na->value->type-nb->value->type;

		if (j)

			{

			nabit = ASN1_tag2bit(na->value->type);

			nbbit = ASN1_tag2bit(nb->value->type);

			if (!(nabit & STR_TYPE_CMP) ||

				!(nbbit & STR_TYPE_CMP))

				return j;

			j = asn1_string_memcmp(na->value, nb->value);

			}

		else if (na->value->type == V_ASN1_PRINTABLESTRING)

			j=nocase_spacenorm_cmp(na->value, nb->value);

		else if (na->value->type == V_ASN1_IA5STRING

			&& OBJ_obj2nid(na->object) == NID_pkcs9_emailAddress)

			j=nocase_cmp(na->value, nb->value);

		else

			j = asn1_string_memcmp(na->value, nb->value);

		if (j) return(j);

		j=na->set-nb->set;

		if (j) return(j);

		}

	/* We will check the object types after checking the values

	 * since the values will more often be different than the object

	 * types. */

	for (i=sk_X509_NAME_ENTRY_num(a->entries)-1; i>=0; i--)

		{

		na=sk_X509_NAME_ENTRY_value(a->entries,i);

		nb=sk_X509_NAME_ENTRY_value(b->entries,i);

		j=OBJ_cmp(na->object,nb->object);

		if (j) return(j);

		}

	return(0);

	}

#ifndef OPENSSL_NO_MD5

/* I now DER encode the name and hash it.  Since I cache the DER encoding,

 * this is reasonably efficient. */

EXPORT_C unsigned long X509_NAME_hash(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 */

EXPORT_C 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);

	}

EXPORT_C 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);

	}

EXPORT_C EVP_PKEY *X509_get_pubkey(X509 *x)

	{

	if ((x == NULL) || (x->cert_info == NULL))

		return(NULL);

	return(X509_PUBKEY_get(x->cert_info->key));

	}

EXPORT_C ASN1_BIT_STRING *X509_get0_pubkey_bitstr(const X509 *x)

	{

	if(!x) return NULL;

	return x->cert_info->key->public_key;

	}

EXPORT_C int X509_check_private_key(X509 *x, EVP_PKEY *k)

	{

	EVP_PKEY *xk=NULL;

	int ok=0;

	xk=X509_get_pubkey(x);

	switch (EVP_PKEY_cmp(xk, k))

		{

	case 1:

		ok=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:

#ifndef OPENSSL_NO_EC

		if (k->type == EVP_PKEY_EC)

			{

			X509err(X509_F_X509_CHECK_PRIVATE_KEY, ERR_R_EC_LIB);

			break;

			}

#endif

#ifndef OPENSSL_NO_DH

		if (k->type == EVP_PKEY_DH)

			{

			/* No idea */

			X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_CANT_CHECK_DH_KEY);

			break;

			}

#endif

	        X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_UNKNOWN_KEY_TYPE);

		}

	EVP_PKEY_free(xk);

	return(ok);

	}