244 lines
7.7 KiB
C
244 lines
7.7 KiB
C
/**
|
|
* \file asn1.h
|
|
*
|
|
* \brief Generic ASN.1 parsing
|
|
*
|
|
* Copyright (C) 2006-2011, 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.
|
|
*/
|
|
#ifndef POLARSSL_ASN1_H
|
|
#define POLARSSL_ASN1_H
|
|
|
|
#include "config.h"
|
|
|
|
#if defined(POLARSSL_BIGNUM_C)
|
|
#include "bignum.h"
|
|
#endif
|
|
|
|
#include <string.h>
|
|
|
|
/**
|
|
* \addtogroup asn1_module
|
|
* \{
|
|
*/
|
|
|
|
/**
|
|
* \name ASN1 Error codes
|
|
* These error codes are OR'ed to X509 error codes for
|
|
* higher error granularity.
|
|
* ASN1 is a standard to specify data structures.
|
|
* \{
|
|
*/
|
|
#define POLARSSL_ERR_ASN1_OUT_OF_DATA -0x0014 /**< Out of data when parsing an ASN1 data structure. */
|
|
#define POLARSSL_ERR_ASN1_UNEXPECTED_TAG -0x0016 /**< ASN1 tag was of an unexpected value. */
|
|
#define POLARSSL_ERR_ASN1_INVALID_LENGTH -0x0018 /**< Error when trying to determine the length or invalid length. */
|
|
#define POLARSSL_ERR_ASN1_LENGTH_MISMATCH -0x001A /**< Actual length differs from expected length. */
|
|
#define POLARSSL_ERR_ASN1_INVALID_DATA -0x001C /**< Data is invalid. (not used) */
|
|
#define POLARSSL_ERR_ASN1_MALLOC_FAILED -0x001E /**< Memory allocation failed */
|
|
/* \} name */
|
|
|
|
/**
|
|
* \name DER constants
|
|
* These constants comply with DER encoded the ANS1 type tags.
|
|
* DER encoding uses hexadecimal representation.
|
|
* An example DER sequence is:\n
|
|
* - 0x02 -- tag indicating INTEGER
|
|
* - 0x01 -- length in octets
|
|
* - 0x05 -- value
|
|
* Such sequences are typically read into \c ::x509_buf.
|
|
* \{
|
|
*/
|
|
#define ASN1_BOOLEAN 0x01
|
|
#define ASN1_INTEGER 0x02
|
|
#define ASN1_BIT_STRING 0x03
|
|
#define ASN1_OCTET_STRING 0x04
|
|
#define ASN1_NULL 0x05
|
|
#define ASN1_OID 0x06
|
|
#define ASN1_UTF8_STRING 0x0C
|
|
#define ASN1_SEQUENCE 0x10
|
|
#define ASN1_SET 0x11
|
|
#define ASN1_PRINTABLE_STRING 0x13
|
|
#define ASN1_T61_STRING 0x14
|
|
#define ASN1_IA5_STRING 0x16
|
|
#define ASN1_UTC_TIME 0x17
|
|
#define ASN1_GENERALIZED_TIME 0x18
|
|
#define ASN1_UNIVERSAL_STRING 0x1C
|
|
#define ASN1_BMP_STRING 0x1E
|
|
#define ASN1_PRIMITIVE 0x00
|
|
#define ASN1_CONSTRUCTED 0x20
|
|
#define ASN1_CONTEXT_SPECIFIC 0x80
|
|
/* \} name */
|
|
/* \} addtogroup asn1_module */
|
|
|
|
/** Returns the size of the binary string, without the trailing \\0 */
|
|
#define OID_SIZE(x) (sizeof(x) - 1)
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* \name Functions to parse ASN.1 data structures
|
|
* \{
|
|
*/
|
|
|
|
/**
|
|
* Type-length-value structure that allows for ASN1 using DER.
|
|
*/
|
|
typedef struct _asn1_buf
|
|
{
|
|
int tag; /**< ASN1 type, e.g. ASN1_UTF8_STRING. */
|
|
size_t len; /**< ASN1 length, e.g. in octets. */
|
|
unsigned char *p; /**< ASN1 data, e.g. in ASCII. */
|
|
}
|
|
asn1_buf;
|
|
|
|
/**
|
|
* Container for ASN1 bit strings.
|
|
*/
|
|
typedef struct _asn1_bitstring
|
|
{
|
|
size_t len; /**< ASN1 length, e.g. in octets. */
|
|
unsigned char unused_bits; /**< Number of unused bits at the end of the string */
|
|
unsigned char *p; /**< Raw ASN1 data for the bit string */
|
|
}
|
|
asn1_bitstring;
|
|
|
|
/**
|
|
* Container for a sequence of ASN.1 items
|
|
*/
|
|
typedef struct _asn1_sequence
|
|
{
|
|
asn1_buf buf; /**< Buffer containing the given ASN.1 item. */
|
|
struct _asn1_sequence *next; /**< The next entry in the sequence. */
|
|
}
|
|
asn1_sequence;
|
|
|
|
/**
|
|
* Get the length of an ASN.1 element.
|
|
* Updates the pointer to immediately behind the length.
|
|
*
|
|
* \param p The position in the ASN.1 data
|
|
* \param end End of data
|
|
* \param len The variable that will receive the value
|
|
*
|
|
* \return 0 if successful, POLARSSL_ERR_ASN1_OUT_OF_DATA on reaching
|
|
* end of data, POLARSSL_ERR_ASN1_INVALID_LENGTH if length is
|
|
* unparseable.
|
|
*/
|
|
int asn1_get_len( unsigned char **p,
|
|
const unsigned char *end,
|
|
size_t *len );
|
|
|
|
/**
|
|
* Get the tag and length of the tag. Check for the requested tag.
|
|
* Updates the pointer to immediately behind the tag and length.
|
|
*
|
|
* \param p The position in the ASN.1 data
|
|
* \param end End of data
|
|
* \param len The variable that will receive the length
|
|
* \param tag The expected tag
|
|
*
|
|
* \return 0 if successful, POLARSSL_ERR_ASN1_UNEXPECTED_TAG if tag did
|
|
* not match requested tag, or another specific ASN.1 error code.
|
|
*/
|
|
int asn1_get_tag( unsigned char **p,
|
|
const unsigned char *end,
|
|
size_t *len, int tag );
|
|
|
|
/**
|
|
* Retrieve a boolean ASN.1 tag and its value.
|
|
* Updates the pointer to immediately behind the full tag.
|
|
*
|
|
* \param p The position in the ASN.1 data
|
|
* \param end End of data
|
|
* \param val The variable that will receive the value
|
|
*
|
|
* \return 0 if successful or a specific ASN.1 error code.
|
|
*/
|
|
int asn1_get_bool( unsigned char **p,
|
|
const unsigned char *end,
|
|
int *val );
|
|
|
|
/**
|
|
* Retrieve an integer ASN.1 tag and its value.
|
|
* Updates the pointer to immediately behind the full tag.
|
|
*
|
|
* \param p The position in the ASN.1 data
|
|
* \param end End of data
|
|
* \param val The variable that will receive the value
|
|
*
|
|
* \return 0 if successful or a specific ASN.1 error code.
|
|
*/
|
|
int asn1_get_int( unsigned char **p,
|
|
const unsigned char *end,
|
|
int *val );
|
|
|
|
/**
|
|
* Retrieve a bitstring ASN.1 tag and its value.
|
|
* Updates the pointer to immediately behind the full tag.
|
|
*
|
|
* \param p The position in the ASN.1 data
|
|
* \param end End of data
|
|
* \param bs The variable that will receive the value
|
|
*
|
|
* \return 0 if successful or a specific ASN.1 error code.
|
|
*/
|
|
int asn1_get_bitstring( unsigned char **p, const unsigned char *end,
|
|
asn1_bitstring *bs);
|
|
|
|
/**
|
|
* Parses and splits an ASN.1 "SEQUENCE OF <tag>"
|
|
* Updated the pointer to immediately behind the full sequence tag.
|
|
*
|
|
* \param p The position in the ASN.1 data
|
|
* \param end End of data
|
|
* \param cur First variable in the chain to fill
|
|
* \param tag Type of sequence
|
|
*
|
|
* \return 0 if successful or a specific ASN.1 error code.
|
|
*/
|
|
int asn1_get_sequence_of( unsigned char **p,
|
|
const unsigned char *end,
|
|
asn1_sequence *cur,
|
|
int tag);
|
|
|
|
#if defined(POLARSSL_BIGNUM_C)
|
|
/**
|
|
* Retrieve a MPI value from an integer ASN.1 tag.
|
|
* Updates the pointer to immediately behind the full tag.
|
|
*
|
|
* \param p The position in the ASN.1 data
|
|
* \param end End of data
|
|
* \param X The MPI that will receive the value
|
|
*
|
|
* \return 0 if successful or a specific ASN.1 or MPI error code.
|
|
*/
|
|
int asn1_get_mpi( unsigned char **p,
|
|
const unsigned char *end,
|
|
mpi *X );
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* asn1.h */
|