Delete bundled copy of OpenSSL and replace with README.

openssl/crypto/x509v3/v3_purp.c

Index: openssl/crypto/x509v3/v3_purp.c
diff --git a/openssl/crypto/x509v3/v3_purp.c b/openssl/crypto/x509v3/v3_purp.c
deleted file mode 100644
index ad688657e01e6485f1f29a1bc46ba6cfaa31ed5c..0000000000000000000000000000000000000000
--- a/openssl/crypto/x509v3/v3_purp.c
+++ /dev/null
@@ -1,767 +0,0 @@
-/* v3_purp.c */
-/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
- * project 2001.
- */
-/* ====================================================================
- * Copyright (c) 1999-2004 The OpenSSL Project.  All rights reserved.
- *
- * 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 above 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 acknowledgment:
- *    "This product includes software developed by the OpenSSL Project
- *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- *    endorse or promote products derived from this software without
- *    prior written permission. For written permission, please contact
- *    licensing@OpenSSL.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- *    nor may "OpenSSL" appear in their names without prior written
- *    permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- *    acknowledgment:
- *    "This product includes software developed by the OpenSSL Project
- *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED 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 OpenSSL PROJECT OR
- * ITS 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.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com).  This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
- *
- */
-
-#include <stdio.h>
-#include "cryptlib.h"
-#include <openssl/x509v3.h>
-#include <openssl/x509_vfy.h>
-
-static void x509v3_cache_extensions(X509 *x);
-
-static int check_ssl_ca(const X509 *x);
-static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x, int ca);
-static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca);
-static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca);
-static int purpose_smime(const X509 *x, int ca);
-static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x, int ca);
-static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x, int ca);
-static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x, int ca);
-static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x, int ca);
-static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca);
-static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca);
-
-static int xp_cmp(const X509_PURPOSE * const *a,
-		const X509_PURPOSE * const *b);
-static void xptable_free(X509_PURPOSE *p);
-
-static X509_PURPOSE xstandard[] = {
-	{X509_PURPOSE_SSL_CLIENT, X509_TRUST_SSL_CLIENT, 0, check_purpose_ssl_client, "SSL client", "sslclient", NULL},
-	{X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, check_purpose_ssl_server, "SSL server", "sslserver", NULL},
-	{X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, check_purpose_ns_ssl_server, "Netscape SSL server", "nssslserver", NULL},
-	{X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign, "S/MIME signing", "smimesign", NULL},
-	{X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0, check_purpose_smime_encrypt, "S/MIME encryption", "smimeencrypt", NULL},
-	{X509_PURPOSE_CRL_SIGN, X509_TRUST_COMPAT, 0, check_purpose_crl_sign, "CRL signing", "crlsign", NULL},
-	{X509_PURPOSE_ANY, X509_TRUST_DEFAULT, 0, no_check, "Any Purpose", "any", NULL},
-	{X509_PURPOSE_OCSP_HELPER, X509_TRUST_COMPAT, 0, ocsp_helper, "OCSP helper", "ocsphelper", NULL},
-	{X509_PURPOSE_TIMESTAMP_SIGN, X509_TRUST_TSA, 0, check_purpose_timestamp_sign, "Time Stamp signing", "timestampsign", NULL},
-};
-
-#define X509_PURPOSE_COUNT (sizeof(xstandard)/sizeof(X509_PURPOSE))
-
-IMPLEMENT_STACK_OF(X509_PURPOSE)
-
-static STACK_OF(X509_PURPOSE) *xptable = NULL;
-
-static int xp_cmp(const X509_PURPOSE * const *a,
-		const X509_PURPOSE * const *b)
-{
-	return (*a)->purpose - (*b)->purpose;
-}
-
-/* As much as I'd like to make X509_check_purpose use a "const" X509*
- * I really can't because it does recalculate hashes and do other non-const
- * things. */
-int X509_check_purpose(X509 *x, int id, int ca)
-{
-	int idx;
-	const X509_PURPOSE *pt;
-	if(!(x->ex_flags & EXFLAG_SET)) {
-		CRYPTO_w_lock(CRYPTO_LOCK_X509);
-		x509v3_cache_extensions(x);
-		CRYPTO_w_unlock(CRYPTO_LOCK_X509);
-	}
-	if(id == -1) return 1;
-	idx = X509_PURPOSE_get_by_id(id);
-	if(idx == -1) return -1;
-	pt = X509_PURPOSE_get0(idx);
-	return pt->check_purpose(pt, x, ca);
-}
-
-int X509_PURPOSE_set(int *p, int purpose)
-{
-	if(X509_PURPOSE_get_by_id(purpose) == -1) {
-		X509V3err(X509V3_F_X509_PURPOSE_SET, X509V3_R_INVALID_PURPOSE);
-		return 0;
-	}
-	*p = purpose;
-	return 1;
-}
-
-int X509_PURPOSE_get_count(void)
-{
-	if(!xptable) return X509_PURPOSE_COUNT;
-	return sk_X509_PURPOSE_num(xptable) + X509_PURPOSE_COUNT;
-}
-
-X509_PURPOSE * X509_PURPOSE_get0(int idx)
-{
-	if(idx < 0) return NULL;
-	if(idx < (int)X509_PURPOSE_COUNT) return xstandard + idx;
-	return sk_X509_PURPOSE_value(xptable, idx - X509_PURPOSE_COUNT);
-}
-
-int X509_PURPOSE_get_by_sname(char *sname)
-{
-	int i;
-	X509_PURPOSE *xptmp;
-	for(i = 0; i < X509_PURPOSE_get_count(); i++) {
-		xptmp = X509_PURPOSE_get0(i);
-		if(!strcmp(xptmp->sname, sname)) return i;
-	}
-	return -1;
-}
-
-int X509_PURPOSE_get_by_id(int purpose)
-{
-	X509_PURPOSE tmp;
-	int idx;
-	if((purpose >= X509_PURPOSE_MIN) && (purpose <= X509_PURPOSE_MAX))
-		return purpose - X509_PURPOSE_MIN;
-	tmp.purpose = purpose;
-	if(!xptable) return -1;
-	idx = sk_X509_PURPOSE_find(xptable, &tmp);
-	if(idx == -1) return -1;
-	return idx + X509_PURPOSE_COUNT;
-}
-
-int X509_PURPOSE_add(int id, int trust, int flags,
-			int (*ck)(const X509_PURPOSE *, const X509 *, int),
-					char *name, char *sname, void *arg)
-{
-	int idx;
-	X509_PURPOSE *ptmp;
-	/* This is set according to what we change: application can't set it */
-	flags &= ~X509_PURPOSE_DYNAMIC;
-	/* This will always be set for application modified trust entries */
-	flags |= X509_PURPOSE_DYNAMIC_NAME;
-	/* Get existing entry if any */
-	idx = X509_PURPOSE_get_by_id(id);
-	/* Need a new entry */
-	if(idx == -1) {
-		if(!(ptmp = OPENSSL_malloc(sizeof(X509_PURPOSE)))) {
-			X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE);
-			return 0;
-		}
-		ptmp->flags = X509_PURPOSE_DYNAMIC;
-	} else ptmp = X509_PURPOSE_get0(idx);
-
-	/* OPENSSL_free existing name if dynamic */
-	if(ptmp->flags & X509_PURPOSE_DYNAMIC_NAME) {
-		OPENSSL_free(ptmp->name);
-		OPENSSL_free(ptmp->sname);
-	}
-	/* dup supplied name */
-	ptmp->name = BUF_strdup(name);
-	ptmp->sname = BUF_strdup(sname);
-	if(!ptmp->name || !ptmp->sname) {
-		X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE);
-		return 0;
-	}
-	/* Keep the dynamic flag of existing entry */
-	ptmp->flags &= X509_PURPOSE_DYNAMIC;
-	/* Set all other flags */
-	ptmp->flags |= flags;
-
-	ptmp->purpose = id;
-	ptmp->trust = trust;
-	ptmp->check_purpose = ck;
-	ptmp->usr_data = arg;
-
-	/* If its a new entry manage the dynamic table */
-	if(idx == -1) {
-		if(!xptable && !(xptable = sk_X509_PURPOSE_new(xp_cmp))) {
-			X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE);
-			return 0;
-		}
-		if (!sk_X509_PURPOSE_push(xptable, ptmp)) {
-			X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE);
-			return 0;
-		}
-	}
-	return 1;
-}
-
-static void xptable_free(X509_PURPOSE *p)
-	{
-	if(!p) return;
-	if (p->flags & X509_PURPOSE_DYNAMIC) 
-		{
-		if (p->flags & X509_PURPOSE_DYNAMIC_NAME) {
-			OPENSSL_free(p->name);
-			OPENSSL_free(p->sname);
-		}
-		OPENSSL_free(p);
-		}
-	}
-
-void X509_PURPOSE_cleanup(void)
-{
-	unsigned int i;
-	sk_X509_PURPOSE_pop_free(xptable, xptable_free);
-	for(i = 0; i < X509_PURPOSE_COUNT; i++) xptable_free(xstandard + i);
-	xptable = NULL;
-}
-
-int X509_PURPOSE_get_id(X509_PURPOSE *xp)
-{
-	return xp->purpose;
-}
-
-char *X509_PURPOSE_get0_name(X509_PURPOSE *xp)
-{
-	return xp->name;
-}
-
-char *X509_PURPOSE_get0_sname(X509_PURPOSE *xp)
-{
-	return xp->sname;
-}
-
-int X509_PURPOSE_get_trust(X509_PURPOSE *xp)
-{
-	return xp->trust;
-}
-
-static int nid_cmp(const int *a, const int *b)
-	{
-	return *a - *b;
-	}
-
-DECLARE_OBJ_BSEARCH_CMP_FN(int, int, nid);
-IMPLEMENT_OBJ_BSEARCH_CMP_FN(int, int, nid);
-
-int X509_supported_extension(X509_EXTENSION *ex)
-	{
-	/* This table is a list of the NIDs of supported extensions:
-	 * that is those which are used by the verify process. If
-	 * an extension is critical and doesn't appear in this list
-	 * then the verify process will normally reject the certificate.
-	 * The list must be kept in numerical order because it will be
-	 * searched using bsearch.
-	 */
-
-	static const int supported_nids[] = {
-		NID_netscape_cert_type, /* 71 */
-        	NID_key_usage,		/* 83 */
-		NID_subject_alt_name,	/* 85 */
-		NID_basic_constraints,	/* 87 */
-		NID_certificate_policies, /* 89 */
-        	NID_ext_key_usage,	/* 126 */
-#ifndef OPENSSL_NO_RFC3779
-		NID_sbgp_ipAddrBlock,	/* 290 */
-		NID_sbgp_autonomousSysNum, /* 291 */
-#endif
-		NID_policy_constraints,	/* 401 */
-		NID_proxyCertInfo,	/* 663 */
-		NID_name_constraints,	/* 666 */
-		NID_policy_mappings,	/* 747 */
-		NID_inhibit_any_policy	/* 748 */
-	};
-
-	int ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex));
-
-	if (ex_nid == NID_undef) 
-		return 0;
-
-	if (OBJ_bsearch_nid(&ex_nid, supported_nids,
-			sizeof(supported_nids)/sizeof(int)))
-		return 1;
-	return 0;
-	}
-
-static void setup_dp(X509 *x, DIST_POINT *dp)
-	{
-	X509_NAME *iname = NULL;
-	int i;
-	if (dp->reasons)
-		{
-		if (dp->reasons->length > 0)
-			dp->dp_reasons = dp->reasons->data[0];
-		if (dp->reasons->length > 1)
-			dp->dp_reasons |= (dp->reasons->data[1] << 8);
-		dp->dp_reasons &= CRLDP_ALL_REASONS;
-		}
-	else
-		dp->dp_reasons = CRLDP_ALL_REASONS;
-	if (!dp->distpoint || (dp->distpoint->type != 1))
-		return;
-	for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++)
-		{
-		GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
-		if (gen->type == GEN_DIRNAME)
-			{
-			iname = gen->d.directoryName;
-			break;
-			}
-		}
-	if (!iname)
-		iname = X509_get_issuer_name(x);
-
-	DIST_POINT_set_dpname(dp->distpoint, iname);
-
-	}
-
-static void setup_crldp(X509 *x)
-	{
-	int i;
-	x->crldp = X509_get_ext_d2i(x, NID_crl_distribution_points, NULL, NULL);
-	for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
-		setup_dp(x, sk_DIST_POINT_value(x->crldp, i));
-	}
-
-static void x509v3_cache_extensions(X509 *x)
-{
-	BASIC_CONSTRAINTS *bs;
-	PROXY_CERT_INFO_EXTENSION *pci;
-	ASN1_BIT_STRING *usage;
-	ASN1_BIT_STRING *ns;
-	EXTENDED_KEY_USAGE *extusage;
-	X509_EXTENSION *ex;
-	
-	int i;
-	if(x->ex_flags & EXFLAG_SET) return;
-#ifndef OPENSSL_NO_SHA
-	X509_digest(x, EVP_sha1(), x->sha1_hash, NULL);
-#endif
-	/* Does subject name match issuer ? */
-	if(!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x)))
-			 x->ex_flags |= EXFLAG_SI;
-	/* V1 should mean no extensions ... */
-	if(!X509_get_version(x)) x->ex_flags |= EXFLAG_V1;
-	/* Handle basic constraints */
-	if((bs=X509_get_ext_d2i(x, NID_basic_constraints, NULL, NULL))) {
-		if(bs->ca) x->ex_flags |= EXFLAG_CA;
-		if(bs->pathlen) {
-			if((bs->pathlen->type == V_ASN1_NEG_INTEGER)
-						|| !bs->ca) {
-				x->ex_flags |= EXFLAG_INVALID;
-				x->ex_pathlen = 0;
-			} else x->ex_pathlen = ASN1_INTEGER_get(bs->pathlen);
-		} else x->ex_pathlen = -1;
-		BASIC_CONSTRAINTS_free(bs);
-		x->ex_flags |= EXFLAG_BCONS;
-	}
-	/* Handle proxy certificates */
-	if((pci=X509_get_ext_d2i(x, NID_proxyCertInfo, NULL, NULL))) {
-		if (x->ex_flags & EXFLAG_CA
-		    || X509_get_ext_by_NID(x, NID_subject_alt_name, 0) >= 0
-		    || X509_get_ext_by_NID(x, NID_issuer_alt_name, 0) >= 0) {
-			x->ex_flags |= EXFLAG_INVALID;
-		}
-		if (pci->pcPathLengthConstraint) {
-			x->ex_pcpathlen =
-				ASN1_INTEGER_get(pci->pcPathLengthConstraint);
-		} else x->ex_pcpathlen = -1;
-		PROXY_CERT_INFO_EXTENSION_free(pci);
-		x->ex_flags |= EXFLAG_PROXY;
-	}
-	/* Handle key usage */
-	if((usage=X509_get_ext_d2i(x, NID_key_usage, NULL, NULL))) {
-		if(usage->length > 0) {
-			x->ex_kusage = usage->data[0];
-			if(usage->length > 1) 
-				x->ex_kusage |= usage->data[1] << 8;
-		} else x->ex_kusage = 0;
-		x->ex_flags |= EXFLAG_KUSAGE;
-		ASN1_BIT_STRING_free(usage);
-	}
-	x->ex_xkusage = 0;
-	if((extusage=X509_get_ext_d2i(x, NID_ext_key_usage, NULL, NULL))) {
-		x->ex_flags |= EXFLAG_XKUSAGE;
-		for(i = 0; i < sk_ASN1_OBJECT_num(extusage); i++) {
-			switch(OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage,i))) {
-				case NID_server_auth:
-				x->ex_xkusage |= XKU_SSL_SERVER;
-				break;
-
-				case NID_client_auth:
-				x->ex_xkusage |= XKU_SSL_CLIENT;
-				break;
-
-				case NID_email_protect:
-				x->ex_xkusage |= XKU_SMIME;
-				break;
-
-				case NID_code_sign:
-				x->ex_xkusage |= XKU_CODE_SIGN;
-				break;
-
-				case NID_ms_sgc:
-				case NID_ns_sgc:
-				x->ex_xkusage |= XKU_SGC;
-				break;
-
-				case NID_OCSP_sign:
-				x->ex_xkusage |= XKU_OCSP_SIGN;
-				break;
-
-				case NID_time_stamp:
-				x->ex_xkusage |= XKU_TIMESTAMP;
-				break;
-
-				case NID_dvcs:
-				x->ex_xkusage |= XKU_DVCS;
-				break;
-			}
-		}
-		sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free);
-	}
-
-	if((ns=X509_get_ext_d2i(x, NID_netscape_cert_type, NULL, NULL))) {
-		if(ns->length > 0) x->ex_nscert = ns->data[0];
-		else x->ex_nscert = 0;
-		x->ex_flags |= EXFLAG_NSCERT;
-		ASN1_BIT_STRING_free(ns);
-	}
-	x->skid =X509_get_ext_d2i(x, NID_subject_key_identifier, NULL, NULL);
-	x->akid =X509_get_ext_d2i(x, NID_authority_key_identifier, NULL, NULL);
-	x->altname = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
-	x->nc = X509_get_ext_d2i(x, NID_name_constraints, &i, NULL);
-	if (!x->nc && (i != -1))
-		x->ex_flags |= EXFLAG_INVALID;
-	setup_crldp(x);
-
-#ifndef OPENSSL_NO_RFC3779
- 	x->rfc3779_addr =X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, NULL, NULL);
- 	x->rfc3779_asid =X509_get_ext_d2i(x, NID_sbgp_autonomousSysNum,
- 					  NULL, NULL);
-#endif
-	for (i = 0; i < X509_get_ext_count(x); i++)
-		{
-		ex = X509_get_ext(x, i);
-		if (OBJ_obj2nid(X509_EXTENSION_get_object(ex))
-					== NID_freshest_crl)
-			x->ex_flags |= EXFLAG_FRESHEST;
-		if (!X509_EXTENSION_get_critical(ex))
-			continue;
-		if (!X509_supported_extension(ex))
-			{
-			x->ex_flags |= EXFLAG_CRITICAL;
-			break;
-			}
-		}
-	x->ex_flags |= EXFLAG_SET;
-}
-
-/* CA checks common to all purposes
- * return codes:
- * 0 not a CA
- * 1 is a CA
- * 2 basicConstraints absent so "maybe" a CA
- * 3 basicConstraints absent but self signed V1.
- * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
- */
-
-#define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
-#define ku_reject(x, usage) \
-	(((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
-#define xku_reject(x, usage) \
-	(((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
-#define ns_reject(x, usage) \
-	(((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
-
-static int check_ca(const X509 *x)
-{
-	/* keyUsage if present should allow cert signing */
-	if(ku_reject(x, KU_KEY_CERT_SIGN)) return 0;
-	if(x->ex_flags & EXFLAG_BCONS) {
-		if(x->ex_flags & EXFLAG_CA) return 1;
-		/* If basicConstraints says not a CA then say so */
-		else return 0;
-	} else {
-		/* we support V1 roots for...  uh, I don't really know why. */
-		if((x->ex_flags & V1_ROOT) == V1_ROOT) return 3;
-		/* If key usage present it must have certSign so tolerate it */
-		else if (x->ex_flags & EXFLAG_KUSAGE) return 4;
-		/* Older certificates could have Netscape-specific CA types */
-		else if (x->ex_flags & EXFLAG_NSCERT
-			 && x->ex_nscert & NS_ANY_CA) return 5;
-		/* can this still be regarded a CA certificate?  I doubt it */
-		return 0;
-	}
-}
-
-int X509_check_ca(X509 *x)
-{
-	if(!(x->ex_flags & EXFLAG_SET)) {
-		CRYPTO_w_lock(CRYPTO_LOCK_X509);
-		x509v3_cache_extensions(x);
-		CRYPTO_w_unlock(CRYPTO_LOCK_X509);
-	}
-
-	return check_ca(x);
-}
-
-/* Check SSL CA: common checks for SSL client and server */
-static int check_ssl_ca(const X509 *x)
-{
-	int ca_ret;
-	ca_ret = check_ca(x);
-	if(!ca_ret) return 0;
-	/* check nsCertType if present */
-	if(ca_ret != 5 || x->ex_nscert & NS_SSL_CA) return ca_ret;
-	else return 0;
-}
-
-
-static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x, int ca)
-{
-	if(xku_reject(x,XKU_SSL_CLIENT)) return 0;
-	if(ca) return check_ssl_ca(x);
-	/* We need to do digital signatures with it */
-	if(ku_reject(x,KU_DIGITAL_SIGNATURE)) return 0;
-	/* nsCertType if present should allow SSL client use */	
-	if(ns_reject(x, NS_SSL_CLIENT)) return 0;
-	return 1;
-}
-
-static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca)
-{
-	if(xku_reject(x,XKU_SSL_SERVER|XKU_SGC)) return 0;
-	if(ca) return check_ssl_ca(x);
-
-	if(ns_reject(x, NS_SSL_SERVER)) return 0;
-	/* Now as for keyUsage: we'll at least need to sign OR encipher */
-	if(ku_reject(x, KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT)) return 0;
-	
-	return 1;
-
-}
-
-static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca)
-{
-	int ret;
-	ret = check_purpose_ssl_server(xp, x, ca);
-	if(!ret || ca) return ret;
-	/* We need to encipher or Netscape complains */
-	if(ku_reject(x, KU_KEY_ENCIPHERMENT)) return 0;
-	return ret;
-}
-
-/* common S/MIME checks */
-static int purpose_smime(const X509 *x, int ca)
-{
-	if(xku_reject(x,XKU_SMIME)) return 0;
-	if(ca) {
-		int ca_ret;
-		ca_ret = check_ca(x);
-		if(!ca_ret) return 0;
-		/* check nsCertType if present */
-		if(ca_ret != 5 || x->ex_nscert & NS_SMIME_CA) return ca_ret;
-		else return 0;
-	}
-	if(x->ex_flags & EXFLAG_NSCERT) {
-		if(x->ex_nscert & NS_SMIME) return 1;
-		/* Workaround for some buggy certificates */
-		if(x->ex_nscert & NS_SSL_CLIENT) return 2;
-		return 0;
-	}
-	return 1;
-}
-
-static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x, int ca)
-{
-	int ret;
-	ret = purpose_smime(x, ca);
-	if(!ret || ca) return ret;
-	if(ku_reject(x, KU_DIGITAL_SIGNATURE|KU_NON_REPUDIATION)) return 0;
-	return ret;
-}
-
-static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x, int ca)
-{
-	int ret;
-	ret = purpose_smime(x, ca);
-	if(!ret || ca) return ret;
-	if(ku_reject(x, KU_KEY_ENCIPHERMENT)) return 0;
-	return ret;
-}
-
-static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x, int ca)
-{
-	if(ca) {
-		int ca_ret;
-		if((ca_ret = check_ca(x)) != 2) return ca_ret;
-		else return 0;
-	}
-	if(ku_reject(x, KU_CRL_SIGN)) return 0;
-	return 1;
-}
-
-/* OCSP helper: this is *not* a full OCSP check. It just checks that
- * each CA is valid. Additional checks must be made on the chain.
- */
-
-static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca)
-{
-	/* Must be a valid CA.  Should we really support the "I don't know"
-	   value (2)? */
-	if(ca) return check_ca(x);
-	/* leaf certificate is checked in OCSP_verify() */
-	return 1;
-}
-
-static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x,
-					int ca)
-{
-	int i_ext;
-
-	/* If ca is true we must return if this is a valid CA certificate. */
-	if (ca) return check_ca(x);
-
-	/* 
-	 * Check the optional key usage field:
-	 * if Key Usage is present, it must be one of digitalSignature 
-	 * and/or nonRepudiation (other values are not consistent and shall
-	 * be rejected).
-	 */
-	if ((x->ex_flags & EXFLAG_KUSAGE)
-	    && ((x->ex_kusage & ~(KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)) ||
-		!(x->ex_kusage & (KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE))))
-		return 0;
-
-	/* Only time stamp key usage is permitted and it's required. */
-	if (!(x->ex_flags & EXFLAG_XKUSAGE) || x->ex_xkusage != XKU_TIMESTAMP)
-		return 0;
-
-	/* Extended Key Usage MUST be critical */
-	i_ext = X509_get_ext_by_NID((X509 *) x, NID_ext_key_usage, 0);
-	if (i_ext >= 0)
-		{
-		X509_EXTENSION *ext = X509_get_ext((X509 *) x, i_ext);
-		if (!X509_EXTENSION_get_critical(ext))
-			return 0;
-		}
-
-	return 1;
-}
-
-static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca)
-{
-	return 1;
-}
-
-/* Various checks to see if one certificate issued the second.
- * This can be used to prune a set of possible issuer certificates
- * which have been looked up using some simple method such as by
- * subject name.
- * These are:
- * 1. Check issuer_name(subject) == subject_name(issuer)
- * 2. If akid(subject) exists check it matches issuer
- * 3. If key_usage(issuer) exists check it supports certificate signing
- * returns 0 for OK, positive for reason for mismatch, reasons match
- * codes for X509_verify_cert()
- */
-
-int X509_check_issued(X509 *issuer, X509 *subject)
-{
-	if(X509_NAME_cmp(X509_get_subject_name(issuer),
-			X509_get_issuer_name(subject)))
-				return X509_V_ERR_SUBJECT_ISSUER_MISMATCH;
-	x509v3_cache_extensions(issuer);
-	x509v3_cache_extensions(subject);
-
-	if(subject->akid)
-		{
-		int ret = X509_check_akid(issuer, subject->akid);
-		if (ret != X509_V_OK)
-			return ret;
-		}
-
-	if(subject->ex_flags & EXFLAG_PROXY)
-		{
-		if(ku_reject(issuer, KU_DIGITAL_SIGNATURE))
-			return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE;
-		}
-	else if(ku_reject(issuer, KU_KEY_CERT_SIGN))
-		return X509_V_ERR_KEYUSAGE_NO_CERTSIGN;
-	return X509_V_OK;
-}
-
-int X509_check_akid(X509 *issuer, AUTHORITY_KEYID *akid)
-	{
-
-	if(!akid)
-		return X509_V_OK;
-
-	/* Check key ids (if present) */
-	if(akid->keyid && issuer->skid &&
-		 ASN1_OCTET_STRING_cmp(akid->keyid, issuer->skid) )
-				return X509_V_ERR_AKID_SKID_MISMATCH;
-	/* Check serial number */
-	if(akid->serial &&
-		ASN1_INTEGER_cmp(X509_get_serialNumber(issuer), akid->serial))
-				return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
-	/* Check issuer name */
-	if(akid->issuer)
-		{
-		/* Ugh, for some peculiar reason AKID includes
-		 * SEQUENCE OF GeneralName. So look for a DirName.
-		 * There may be more than one but we only take any
-		 * notice of the first.
-		 */
-		GENERAL_NAMES *gens;
-		GENERAL_NAME *gen;
-		X509_NAME *nm = NULL;
-		int i;
-		gens = akid->issuer;
-		for(i = 0; i < sk_GENERAL_NAME_num(gens); i++)
-			{
-			gen = sk_GENERAL_NAME_value(gens, i);
-			if(gen->type == GEN_DIRNAME)
-				{
-				nm = gen->d.dirn;
-				break;
-				}
-			}
-		if(nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer)))
-			return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
-		}
-	return X509_V_OK;
-	}
-