/* 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));
	}

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));
	}

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_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


/* 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)

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. */
unsigned long X509_NAME_hash(X509_NAME *x)
	{
	unsigned long ret=0;
	unsigned char md[16];
	EVP_MD_CTX md_ctx;

	/* Make sure X509_NAME structure contains valid cached encoding */
	i2d_X509_NAME(x,NULL);
	EVP_MD_CTX_init(&md_ctx);
	EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
	EVP_DigestInit_ex(&md_ctx, EVP_md5(), NULL);
	EVP_DigestUpdate(&md_ctx, x->bytes->data, x->bytes->length);
	EVP_DigestFinal_ex(&md_ctx,md,NULL);
	EVP_MD_CTX_cleanup(&md_ctx);

	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=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);
	}