/* 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);

 	}