library/oid.c - security/mbedtls - Rivoreo Source Code Repositories

 /**
  * \file oid.c
  *
  * \brief Object Identifier (OID) database
  *
  *  Copyright (C) 2006-2013, Brainspark B.V.
  *
  *  This file is part of PolarSSL (http://www.polarssl.org)
  *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
  *
  *  All rights reserved.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License along
  *  with this program; if not, write to the Free Software Foundation, Inc.,
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */

 #include "polarssl/config.h"

 #if defined(POLARSSL_OID_C)

 #include "polarssl/oid.h"
 #include "polarssl/md.h"
 #include "polarssl/rsa.h"

 /*
  * For X520 attribute types
  */
 typedef struct {
     oid_descriptor_t    descriptor;
     const char          *short_name;
 } oid_x520_attr_t;

 static const oid_x520_attr_t oid_x520_attr_type[] =
 {
     {
         { OID_AT_CN,          "id-at-commonName",               "Common Name" },
         "CN",
     },
     {
         { OID_AT_COUNTRY,     "id-at-countryName",              "Country" },
         "C",
     },
     {
         { OID_AT_LOCALITY,    "id-at-locality",                 "Locality" },
         "L",
     },
     {
         { OID_AT_STATE,       "id-at-state",                    "State" },
         "ST",
     },
     {
         { OID_AT_ORGANIZATION,"id-at-organizationName",         "Organization" },
         "O",
     },
     {
         { OID_AT_ORG_UNIT,    "id-at-organizationalUnitName",   "Org Unit" },
         "OU",
     },
     {
         { OID_PKCS9_EMAIL,    "emailAddress",                   "E-mail address" },
         "emailAddress",
     },
     {
         { NULL, NULL, NULL },
         NULL,
     }
 };

 /*
  * For X509 extensions
  */
 typedef struct {
     oid_descriptor_t    descriptor;
     int                 ext_type;
 } oid_x509_ext_t;

 static const oid_x509_ext_t oid_x509_ext[] =
 {
     {
         { OID_BASIC_CONSTRAINTS,    "id-ce-basicConstraints",   "Basic Constraints" },
         EXT_BASIC_CONSTRAINTS,
     },
     {
         { OID_KEY_USAGE,            "id-ce-keyUsage",           "Key Usage" },
         EXT_KEY_USAGE,
     },
     {
         { OID_EXTENDED_KEY_USAGE,   "id-ce-keyUsage",           "Extended Key Usage" },
         EXT_EXTENDED_KEY_USAGE,
     },
     {
         { OID_SUBJECT_ALT_NAME,     "id-ce-subjectAltName",     "Subject Alt Name" },
         EXT_SUBJECT_ALT_NAME,
     },
     {
         { OID_NS_CERT_TYPE,         "id-netscape-certtype",     "Netscape Certificate Type" },
         EXT_NS_CERT_TYPE,
     },
     {
         { NULL, NULL, NULL },
         0,
     },
 };

 static const oid_descriptor_t oid_ext_key_usage[] =
 {
     { OID_SERVER_AUTH,      "id-kp-serverAuth",      "TLS Web Server Authentication" },
     { OID_CLIENT_AUTH,      "id-kp-clientAuth",      "TLS Web Client Authentication" },
     { OID_CODE_SIGNING,     "id-kp-codeSigning",     "Code Signing" },
     { OID_EMAIL_PROTECTION, "id-kp-emailProtection", "E-mail Protection" },
     { OID_TIME_STAMPING,    "id-kp-timeStamping",    "Time Stamping" },
     { OID_OCSP_SIGNING,     "id-kp-OCSPSigning",     "OCSP Signing" },
     { NULL, NULL, NULL },
 };

 /*
  * For SignatureAlgorithmIdentifier
  */
 typedef struct {
     oid_descriptor_t    descriptor;
     md_type_t           md_alg;
     pk_type_t           pk_alg;
 } oid_sig_alg_t;

 static const oid_sig_alg_t oid_sig_alg[] =
 {
     {
         { OID_PKCS1_MD2,        "md2WithRSAEncryption",     "RSA with MD2" },
         POLARSSL_MD_MD2,      POLARSSL_PK_RSA,
     },
     {
         { OID_PKCS1_MD4,        "md4WithRSAEncryption",     "RSA with MD4" },
         POLARSSL_MD_MD4,      POLARSSL_PK_RSA,
     },
     {
         { OID_PKCS1_MD5,        "md5WithRSAEncryption",     "RSA with MD5" },
         POLARSSL_MD_MD5,      POLARSSL_PK_RSA,
     },
     {
         { OID_PKCS1_SHA1,       "sha-1WithRSAEncryption",   "RSA with SHA1" },
         POLARSSL_MD_SHA1,     POLARSSL_PK_RSA,
     },
     {
         { OID_PKCS1_SHA224,     "sha224WithRSAEncryption",  "RSA with SHA-224" },
         POLARSSL_MD_SHA224,   POLARSSL_PK_RSA,
     },
     {
         { OID_PKCS1_SHA256,     "sha256WithRSAEncryption",  "RSA with SHA-256" },
         POLARSSL_MD_SHA256,   POLARSSL_PK_RSA,
     },
     {
         { OID_PKCS1_SHA384,     "sha384WithRSAEncryption",  "RSA with SHA-384" },
         POLARSSL_MD_SHA384,   POLARSSL_PK_RSA,
     },
     {
         { OID_PKCS1_SHA512,     "sha512WithRSAEncryption",  "RSA with SHA-512" },
         POLARSSL_MD_SHA512,   POLARSSL_PK_RSA,
     },
     {
         { OID_RSA_SHA_OBS,      "sha-1WithRSAEncryption",   "RSA with SHA1" },
         POLARSSL_MD_SHA1,     POLARSSL_PK_RSA,
     },
     {
         { NULL, NULL, NULL },
         0, 0,
     },
 };

 /*
  * For PublicKeyInfo
  */
 typedef struct {
     oid_descriptor_t    descriptor;
     pk_type_t           pk_alg;
 } oid_pk_alg_t;

 static const oid_pk_alg_t oid_pk_alg[] =
 {
     {
         { OID_PKCS1_RSA,      "rsaEncryption",   "RSA" },
         POLARSSL_PK_RSA,
     },
     {
         { NULL, NULL, NULL },
         0,
     },
 };

 /*
  * For digestAlgorithm
  */
 typedef struct {
     oid_descriptor_t    descriptor;
     md_type_t           md_alg;
 } oid_md_alg_t;

 static const oid_md_alg_t oid_md_alg[] =
 {
     {
         { OID_DIGEST_ALG_MD2,       "id-md2",       "MD2" },
         POLARSSL_MD_MD2,
     },
     {
         { OID_DIGEST_ALG_MD4,       "id-md4",       "MD4" },
         POLARSSL_MD_MD4,
     },
     {
         { OID_DIGEST_ALG_MD5,       "id-md5",       "MD5" },
         POLARSSL_MD_MD5,
     },
     {
         { OID_DIGEST_ALG_SHA1,      "id-sha1",      "SHA-1" },
         POLARSSL_MD_SHA1,
     },
     {
         { OID_DIGEST_ALG_SHA1,      "id-sha1",      "SHA-1" },
         POLARSSL_MD_SHA1,
     },
     {
         { OID_DIGEST_ALG_SHA224,    "id-sha224",    "SHA-224" },
         POLARSSL_MD_SHA224,
     },
     {
         { OID_DIGEST_ALG_SHA256,    "id-sha256",    "SHA-256" },
         POLARSSL_MD_SHA256,
     },
     {
         { OID_DIGEST_ALG_SHA384,    "id-sha384",    "SHA-384" },
         POLARSSL_MD_SHA384,
     },
     {
         { OID_DIGEST_ALG_SHA512,    "id-sha512",    "SHA-512" },
         POLARSSL_MD_SHA512,
     },
     {
         { NULL, NULL, NULL },
         0,
     },
 };

 #if defined _MSC_VER && !defined snprintf
 #include <stdarg.h>

 #if !defined vsnprintf
 #define vsnprintf _vsnprintf
 #endif // vsnprintf

 /*
  * Windows _snprintf and _vsnprintf are not compatible to linux versions.
  * Result value is not size of buffer needed, but -1 if no fit is possible.
  *
  * This fuction tries to 'fix' this by at least suggesting enlarging the
  * size by 20.
  */
 static int compat_snprintf(char *str, size_t size, const char *format, ...)
 {
     va_list ap;
     int res = -1;

     va_start( ap, format );

     res = vsnprintf( str, size, format, ap );

     va_end( ap );

     // No quick fix possible
     if ( res < 0 )
         return( (int) size + 20 );

     return res;
 }

 #define snprintf compat_snprintf
 #endif

 #define POLARSSL_ERR_DEBUG_BUF_TOO_SMALL    -2

 #define SAFE_SNPRINTF()                         \
 {                                               \
     if( ret == -1 )                             \
         return( -1 );                           \
                                                 \
     if ( (unsigned int) ret > n ) {             \
         p[n - 1] = '\0';                        \
         return POLARSSL_ERR_DEBUG_BUF_TOO_SMALL;\
     }                                           \
                                                 \
     n -= (unsigned int) ret;                    \
     p += (unsigned int) ret;                    \
 }

 /* Return the x.y.z.... style numeric string for the given OID */
 int oid_get_numeric_string( char *buf, size_t size,
                             const asn1_buf *oid )
 {
     int ret;
     size_t i, n;
     unsigned int value;
     char *p;

     p = buf;
     n = size;

     /* First byte contains first two dots */
     if( oid->len > 0 )
     {
         ret = snprintf( p, n, "%d.%d", oid->p[0] / 40, oid->p[0] % 40 );
         SAFE_SNPRINTF();
     }

     /* Prevent overflow in value. */
     if( oid->len > sizeof(value) )
         return( POLARSSL_ERR_DEBUG_BUF_TOO_SMALL );

     value = 0;
     for( i = 1; i < oid->len; i++ )
     {
         value <<= 7;
         value += oid->p[i] & 0x7F;

         if( !( oid->p[i] & 0x80 ) )
         {
             /* Last byte */
             ret = snprintf( p, n, ".%d", value );
             SAFE_SNPRINTF();
             value = 0;
         }
     }

     return( (int) ( size - n ) );
 }

 static const oid_descriptor_t *oid_descriptor_from_buf(
                 const void *struct_set,
                 size_t struct_size,
                 const unsigned char *oid,
                 size_t len )
 {
     const unsigned char *p = (unsigned char *) struct_set;
     const oid_descriptor_t *cur;

     if( struct_set == NULL || oid == NULL )
         return( NULL );

     cur = (const oid_descriptor_t *) p;
     while( cur->asn1 != NULL )
     {
         if( strlen( cur->asn1 ) == len &&
             memcmp( cur->asn1, oid, len ) == 0 )
         {
             return( cur );
         }

         p += struct_size;
         cur = (const oid_descriptor_t *) p;
     }

     return( NULL );
 }

 static const oid_descriptor_t *oid_descriptor_from_asn1(
                 const void *struct_set,
                 size_t struct_size,
                 const asn1_buf *oid )
 {
     return oid_descriptor_from_buf( struct_set, struct_size,
                                     oid->p, oid->len );
 }

 int oid_get_extended_key_usage( const asn1_buf *oid, const char **desc )
 {
     const oid_descriptor_t *data = oid_descriptor_from_asn1(
                                 oid_ext_key_usage,
                                 sizeof(oid_descriptor_t),
                                 oid );

     if( data == NULL )
         return( POLARSSL_ERR_OID_NOT_FOUND );

     *desc = data->description;

     return( 0 );
 }

 static const oid_x509_ext_t *oid_x509_ext_from_asn1( const asn1_buf *oid )
 {
     return (const oid_x509_ext_t *) oid_descriptor_from_asn1(
                                 oid_x509_ext,
                                 sizeof(oid_x509_ext_t),
                                 oid );
 }

 static const oid_x520_attr_t *oid_x520_attr_from_asn1( const asn1_buf *oid )
 {
     return (const oid_x520_attr_t *) oid_descriptor_from_asn1(
                                 oid_x520_attr_type,
                                 sizeof(oid_x520_attr_t),
                                 oid );
 }

 static const oid_pk_alg_t *oid_pk_alg_from_asn1( const asn1_buf *oid )
 {
     return (const oid_pk_alg_t *) oid_descriptor_from_asn1(
                                 oid_pk_alg,
                                 sizeof(oid_pk_alg_t),
                                 oid );
 }

 static const oid_sig_alg_t *oid_sig_alg_from_asn1( const asn1_buf *oid )
 {
     return (const oid_sig_alg_t *) oid_descriptor_from_asn1(
                                 oid_sig_alg,
                                 sizeof(oid_sig_alg_t),
                                 oid );
 }

 static const oid_md_alg_t *oid_md_alg_from_asn1( const asn1_buf *oid )
 {
     return (const oid_md_alg_t *) oid_descriptor_from_asn1(
                                 oid_md_alg,
                                 sizeof(oid_md_alg_t),
                                 oid );
 }

 int oid_get_x509_ext_type( const asn1_buf *oid, int *ext_type )
 {
     const oid_x509_ext_t *data = oid_x509_ext_from_asn1( oid );

     if( data == NULL )
         return( POLARSSL_ERR_OID_NOT_FOUND );

     *ext_type = data->ext_type;

     return( 0 );
 }

 int oid_get_attr_short_name( const asn1_buf *oid, const char **short_name )
 {
     const oid_x520_attr_t *data = oid_x520_attr_from_asn1( oid );

     if( data == NULL )
         return( POLARSSL_ERR_OID_NOT_FOUND );

     *short_name = data->short_name;

     return( 0 );
 }

 int oid_get_pk_alg( const asn1_buf *oid, pk_type_t *pk_alg )
 {
     const oid_pk_alg_t *data = oid_pk_alg_from_asn1( oid );

     if( data == NULL )
         return( POLARSSL_ERR_OID_NOT_FOUND );

     *pk_alg = data->pk_alg;

     return( 0 );
 }

 int oid_get_sig_alg_desc( const asn1_buf *oid, const char **desc )
 {
     const oid_sig_alg_t *data = oid_sig_alg_from_asn1( oid );

     if( data == NULL )
         return( POLARSSL_ERR_OID_NOT_FOUND );

     *desc = data->descriptor.description;

     return( 0 );
 }

 int oid_get_sig_alg( const asn1_buf *oid,
                      md_type_t *md_alg, pk_type_t *pk_alg )
 {
     const oid_sig_alg_t *data = oid_sig_alg_from_asn1( oid );

     if( data == NULL )
         return( POLARSSL_ERR_OID_NOT_FOUND );

     *md_alg = data->md_alg;
     *pk_alg = data->pk_alg;

     return( 0 );
 }

 int oid_get_oid_by_sig_alg( pk_type_t pk_alg, md_type_t md_alg,
                             const char **oid_str )
 {
     const oid_sig_alg_t *cur = oid_sig_alg;

     while( cur->descriptor.asn1 != NULL )
     {
         if( cur->pk_alg == pk_alg &&
             cur->md_alg == md_alg )
         {
             *oid_str = cur->descriptor.asn1;
             return( 0 );
         }

         cur++;
     }

     return( POLARSSL_ERR_OID_NOT_FOUND );
 }

 int oid_get_md_alg( const asn1_buf *oid,
                     md_type_t *md_alg )
 {
     const oid_md_alg_t *data = oid_md_alg_from_asn1( oid );

     if( data == NULL )
         return( POLARSSL_ERR_OID_NOT_FOUND );

     *md_alg = data->md_alg;

     return( 0 );
 }

 int oid_get_oid_by_md( md_type_t md_alg,
                        const char **oid_str )
 {
     const oid_md_alg_t *cur = oid_md_alg;

     while( cur->descriptor.asn1 != NULL )
     {
         if( cur->md_alg == md_alg )
         {
             *oid_str = cur->descriptor.asn1;
             return( 0 );
         }

         cur++;
     }

     return( POLARSSL_ERR_OID_NOT_FOUND );
 }

 #endif /* POLARSSL_OID_C */
	/**
	* \file oid.c
	*
	* \brief Object Identifier (OID) database
	*
	* Copyright (C) 2006-2013, Brainspark B.V.
	*
	* This file is part of PolarSSL (http://www.polarssl.org)
	* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
	*
	* All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	*/

	#include "polarssl/config.h"

	#if defined(POLARSSL_OID_C)

	#include "polarssl/oid.h"
	#include "polarssl/md.h"
	#include "polarssl/rsa.h"

	/*
	* For X520 attribute types
	*/
	typedef struct {
	oid_descriptor_t descriptor;
	const char *short_name;
	} oid_x520_attr_t;

	static const oid_x520_attr_t oid_x520_attr_type[] =
	{
	{
	{ OID_AT_CN, "id-at-commonName", "Common Name" },
	"CN",
	},
	{
	{ OID_AT_COUNTRY, "id-at-countryName", "Country" },
	"C",
	},
	{
	{ OID_AT_LOCALITY, "id-at-locality", "Locality" },
	"L",
	},
	{
	{ OID_AT_STATE, "id-at-state", "State" },
	"ST",
	},
	{
	{ OID_AT_ORGANIZATION,"id-at-organizationName", "Organization" },
	"O",
	},
	{
	{ OID_AT_ORG_UNIT, "id-at-organizationalUnitName", "Org Unit" },
	"OU",
	},
	{
	{ OID_PKCS9_EMAIL, "emailAddress", "E-mail address" },
	"emailAddress",
	},
	{
	{ NULL, NULL, NULL },
	NULL,
	}
	};

	/*
	* For X509 extensions
	*/
	typedef struct {
	oid_descriptor_t descriptor;
	int ext_type;
	} oid_x509_ext_t;

	static const oid_x509_ext_t oid_x509_ext[] =
	{
	{
	{ OID_BASIC_CONSTRAINTS, "id-ce-basicConstraints", "Basic Constraints" },
	EXT_BASIC_CONSTRAINTS,
	},
	{
	{ OID_KEY_USAGE, "id-ce-keyUsage", "Key Usage" },
	EXT_KEY_USAGE,
	},
	{
	{ OID_EXTENDED_KEY_USAGE, "id-ce-keyUsage", "Extended Key Usage" },
	EXT_EXTENDED_KEY_USAGE,
	},
	{
	{ OID_SUBJECT_ALT_NAME, "id-ce-subjectAltName", "Subject Alt Name" },
	EXT_SUBJECT_ALT_NAME,
	},
	{
	{ OID_NS_CERT_TYPE, "id-netscape-certtype", "Netscape Certificate Type" },
	EXT_NS_CERT_TYPE,
	},
	{
	{ NULL, NULL, NULL },
	0,
	},
	};

	static const oid_descriptor_t oid_ext_key_usage[] =
	{
	{ OID_SERVER_AUTH, "id-kp-serverAuth", "TLS Web Server Authentication" },
	{ OID_CLIENT_AUTH, "id-kp-clientAuth", "TLS Web Client Authentication" },
	{ OID_CODE_SIGNING, "id-kp-codeSigning", "Code Signing" },
	{ OID_EMAIL_PROTECTION, "id-kp-emailProtection", "E-mail Protection" },
	{ OID_TIME_STAMPING, "id-kp-timeStamping", "Time Stamping" },
	{ OID_OCSP_SIGNING, "id-kp-OCSPSigning", "OCSP Signing" },
	{ NULL, NULL, NULL },
	};

	/*
	* For SignatureAlgorithmIdentifier
	*/
	typedef struct {
	oid_descriptor_t descriptor;
	md_type_t md_alg;
	pk_type_t pk_alg;
	} oid_sig_alg_t;

	static const oid_sig_alg_t oid_sig_alg[] =
	{
	{
	{ OID_PKCS1_MD2, "md2WithRSAEncryption", "RSA with MD2" },
	POLARSSL_MD_MD2, POLARSSL_PK_RSA,
	},
	{
	{ OID_PKCS1_MD4, "md4WithRSAEncryption", "RSA with MD4" },
	POLARSSL_MD_MD4, POLARSSL_PK_RSA,
	},
	{
	{ OID_PKCS1_MD5, "md5WithRSAEncryption", "RSA with MD5" },
	POLARSSL_MD_MD5, POLARSSL_PK_RSA,
	},
	{
	{ OID_PKCS1_SHA1, "sha-1WithRSAEncryption", "RSA with SHA1" },
	POLARSSL_MD_SHA1, POLARSSL_PK_RSA,
	},
	{
	{ OID_PKCS1_SHA224, "sha224WithRSAEncryption", "RSA with SHA-224" },
	POLARSSL_MD_SHA224, POLARSSL_PK_RSA,
	},
	{
	{ OID_PKCS1_SHA256, "sha256WithRSAEncryption", "RSA with SHA-256" },
	POLARSSL_MD_SHA256, POLARSSL_PK_RSA,
	},
	{
	{ OID_PKCS1_SHA384, "sha384WithRSAEncryption", "RSA with SHA-384" },
	POLARSSL_MD_SHA384, POLARSSL_PK_RSA,
	},
	{
	{ OID_PKCS1_SHA512, "sha512WithRSAEncryption", "RSA with SHA-512" },
	POLARSSL_MD_SHA512, POLARSSL_PK_RSA,
	},
	{
	{ OID_RSA_SHA_OBS, "sha-1WithRSAEncryption", "RSA with SHA1" },
	POLARSSL_MD_SHA1, POLARSSL_PK_RSA,
	},
	{
	{ NULL, NULL, NULL },
	0, 0,
	},
	};

	/*
	* For PublicKeyInfo
	*/
	typedef struct {
	oid_descriptor_t descriptor;
	pk_type_t pk_alg;
	} oid_pk_alg_t;

	static const oid_pk_alg_t oid_pk_alg[] =
	{
	{
	{ OID_PKCS1_RSA, "rsaEncryption", "RSA" },
	POLARSSL_PK_RSA,
	},
	{
	{ NULL, NULL, NULL },
	0,
	},
	};

	/*
	* For digestAlgorithm
	*/
	typedef struct {
	oid_descriptor_t descriptor;
	md_type_t md_alg;
	} oid_md_alg_t;

	static const oid_md_alg_t oid_md_alg[] =
	{
	{
	{ OID_DIGEST_ALG_MD2, "id-md2", "MD2" },
	POLARSSL_MD_MD2,
	},
	{
	{ OID_DIGEST_ALG_MD4, "id-md4", "MD4" },
	POLARSSL_MD_MD4,
	},
	{
	{ OID_DIGEST_ALG_MD5, "id-md5", "MD5" },
	POLARSSL_MD_MD5,
	},
	{
	{ OID_DIGEST_ALG_SHA1, "id-sha1", "SHA-1" },
	POLARSSL_MD_SHA1,
	},
	{
	{ OID_DIGEST_ALG_SHA1, "id-sha1", "SHA-1" },
	POLARSSL_MD_SHA1,
	},
	{
	{ OID_DIGEST_ALG_SHA224, "id-sha224", "SHA-224" },
	POLARSSL_MD_SHA224,
	},
	{
	{ OID_DIGEST_ALG_SHA256, "id-sha256", "SHA-256" },
	POLARSSL_MD_SHA256,
	},
	{
	{ OID_DIGEST_ALG_SHA384, "id-sha384", "SHA-384" },
	POLARSSL_MD_SHA384,
	},
	{
	{ OID_DIGEST_ALG_SHA512, "id-sha512", "SHA-512" },
	POLARSSL_MD_SHA512,
	},
	{
	{ NULL, NULL, NULL },
	0,
	},
	};

	#if defined _MSC_VER && !defined snprintf
	#include <stdarg.h>

	#if !defined vsnprintf
	#define vsnprintf _vsnprintf
	#endif // vsnprintf

	/*
	* Windows _snprintf and _vsnprintf are not compatible to linux versions.
	* Result value is not size of buffer needed, but -1 if no fit is possible.
	*
	* This fuction tries to 'fix' this by at least suggesting enlarging the
	* size by 20.
	*/
	static int compat_snprintf(char str, size_t size, const char format, ...)
	{
	va_list ap;
	int res = -1;

	va_start( ap, format );

	res = vsnprintf( str, size, format, ap );

	va_end( ap );

	// No quick fix possible
	if ( res < 0 )
	return( (int) size + 20 );

	return res;
	}

	#define snprintf compat_snprintf
	#endif

	#define POLARSSL_ERR_DEBUG_BUF_TOO_SMALL -2

	#define SAFE_SNPRINTF() \
	{ \
	if( ret == -1 ) \
	return( -1 ); \
	\
	if ( (unsigned int) ret > n ) { \
	p[n - 1] = '\0'; \
	return POLARSSL_ERR_DEBUG_BUF_TOO_SMALL;\
	} \
	\
	n -= (unsigned int) ret; \
	p += (unsigned int) ret; \
	}

	/* Return the x.y.z.... style numeric string for the given OID */
	int oid_get_numeric_string( char *buf, size_t size,
	const asn1_buf *oid )
	{
	int ret;
	size_t i, n;
	unsigned int value;
	char *p;

	p = buf;
	n = size;

	/* First byte contains first two dots */
	if( oid->len > 0 )
	{
	ret = snprintf( p, n, "%d.%d", oid->p[0] / 40, oid->p[0] % 40 );
	SAFE_SNPRINTF();
	}

	/* Prevent overflow in value. */
	if( oid->len > sizeof(value) )
	return( POLARSSL_ERR_DEBUG_BUF_TOO_SMALL );

	value = 0;
	for( i = 1; i < oid->len; i++ )
	{
	value <<= 7;
	value += oid->p[i] & 0x7F;

	if( !( oid->p[i] & 0x80 ) )
	{
	/* Last byte */
	ret = snprintf( p, n, ".%d", value );
	SAFE_SNPRINTF();
	value = 0;
	}
	}

	return( (int) ( size - n ) );
	}

	static const oid_descriptor_t *oid_descriptor_from_buf(
	const void *struct_set,
	size_t struct_size,
	const unsigned char *oid,
	size_t len )
	{
	const unsigned char p = (unsigned char ) struct_set;
	const oid_descriptor_t *cur;

	if( struct_set == NULL \|\| oid == NULL )
	return( NULL );

	cur = (const oid_descriptor_t *) p;
	while( cur->asn1 != NULL )
	{
	if( strlen( cur->asn1 ) == len &&
	memcmp( cur->asn1, oid, len ) == 0 )
	{
	return( cur );
	}

	p += struct_size;
	cur = (const oid_descriptor_t *) p;
	}

	return( NULL );
	}

	static const oid_descriptor_t *oid_descriptor_from_asn1(
	const void *struct_set,
	size_t struct_size,
	const asn1_buf *oid )
	{
	return oid_descriptor_from_buf( struct_set, struct_size,
	oid->p, oid->len );
	}

	int oid_get_extended_key_usage( const asn1_buf oid, const char *desc )
	{
	const oid_descriptor_t *data = oid_descriptor_from_asn1(
	oid_ext_key_usage,
	sizeof(oid_descriptor_t),
	oid );

	if( data == NULL )
	return( POLARSSL_ERR_OID_NOT_FOUND );

	*desc = data->description;

	return( 0 );
	}

	static const oid_x509_ext_t oid_x509_ext_from_asn1( const asn1_buf oid )
	{
	return (const oid_x509_ext_t *) oid_descriptor_from_asn1(
	oid_x509_ext,
	sizeof(oid_x509_ext_t),
	oid );
	}

	static const oid_x520_attr_t oid_x520_attr_from_asn1( const asn1_buf oid )
	{
	return (const oid_x520_attr_t *) oid_descriptor_from_asn1(
	oid_x520_attr_type,
	sizeof(oid_x520_attr_t),
	oid );
	}

	static const oid_pk_alg_t oid_pk_alg_from_asn1( const asn1_buf oid )
	{
	return (const oid_pk_alg_t *) oid_descriptor_from_asn1(
	oid_pk_alg,
	sizeof(oid_pk_alg_t),
	oid );
	}

	static const oid_sig_alg_t oid_sig_alg_from_asn1( const asn1_buf oid )
	{
	return (const oid_sig_alg_t *) oid_descriptor_from_asn1(
	oid_sig_alg,
	sizeof(oid_sig_alg_t),
	oid );
	}

	static const oid_md_alg_t oid_md_alg_from_asn1( const asn1_buf oid )
	{
	return (const oid_md_alg_t *) oid_descriptor_from_asn1(
	oid_md_alg,
	sizeof(oid_md_alg_t),
	oid );
	}

	int oid_get_x509_ext_type( const asn1_buf oid, int ext_type )
	{
	const oid_x509_ext_t *data = oid_x509_ext_from_asn1( oid );

	if( data == NULL )
	return( POLARSSL_ERR_OID_NOT_FOUND );

	*ext_type = data->ext_type;

	return( 0 );
	}

	int oid_get_attr_short_name( const asn1_buf oid, const char *short_name )
	{
	const oid_x520_attr_t *data = oid_x520_attr_from_asn1( oid );

	if( data == NULL )
	return( POLARSSL_ERR_OID_NOT_FOUND );

	*short_name = data->short_name;

	return( 0 );
	}

	int oid_get_pk_alg( const asn1_buf oid, pk_type_t pk_alg )
	{
	const oid_pk_alg_t *data = oid_pk_alg_from_asn1( oid );

	if( data == NULL )
	return( POLARSSL_ERR_OID_NOT_FOUND );

	*pk_alg = data->pk_alg;

	return( 0 );
	}

	int oid_get_sig_alg_desc( const asn1_buf oid, const char *desc )
	{
	const oid_sig_alg_t *data = oid_sig_alg_from_asn1( oid );

	if( data == NULL )
	return( POLARSSL_ERR_OID_NOT_FOUND );

	*desc = data->descriptor.description;

	return( 0 );
	}

	int oid_get_sig_alg( const asn1_buf *oid,
	md_type_t md_alg, pk_type_t pk_alg )
	{
	const oid_sig_alg_t *data = oid_sig_alg_from_asn1( oid );

	if( data == NULL )
	return( POLARSSL_ERR_OID_NOT_FOUND );

	*md_alg = data->md_alg;
	*pk_alg = data->pk_alg;

	return( 0 );
	}

	int oid_get_oid_by_sig_alg( pk_type_t pk_alg, md_type_t md_alg,
	const char **oid_str )
	{
	const oid_sig_alg_t *cur = oid_sig_alg;

	while( cur->descriptor.asn1 != NULL )
	{
	if( cur->pk_alg == pk_alg &&
	cur->md_alg == md_alg )
	{
	*oid_str = cur->descriptor.asn1;
	return( 0 );
	}

	cur++;
	}

	return( POLARSSL_ERR_OID_NOT_FOUND );
	}

	int oid_get_md_alg( const asn1_buf *oid,
	md_type_t *md_alg )
	{
	const oid_md_alg_t *data = oid_md_alg_from_asn1( oid );

	if( data == NULL )
	return( POLARSSL_ERR_OID_NOT_FOUND );

	*md_alg = data->md_alg;

	return( 0 );
	}

	int oid_get_oid_by_md( md_type_t md_alg,
	const char **oid_str )
	{
	const oid_md_alg_t *cur = oid_md_alg;

	while( cur->descriptor.asn1 != NULL )
	{
	if( cur->md_alg == md_alg )
	{
	*oid_str = cur->descriptor.asn1;
	return( 0 );
	}

	cur++;
	}

	return( POLARSSL_ERR_OID_NOT_FOUND );
	}

	#endif /* POLARSSL_OID_C */