334 lines
11 KiB
C
334 lines
11 KiB
C
/**
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* \file asn1.h
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*
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* \brief Generic ASN.1 parsing
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*
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* Copyright (C) 2006-2013, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef POLARSSL_ASN1_H
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#define POLARSSL_ASN1_H
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#include "config.h"
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#if defined(POLARSSL_BIGNUM_C)
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#include "bignum.h"
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#endif
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#include <string.h>
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/**
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* \addtogroup asn1_module
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* \{
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*/
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/**
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* \name ASN1 Error codes
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* These error codes are OR'ed to X509 error codes for
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* higher error granularity.
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* ASN1 is a standard to specify data structures.
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* \{
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*/
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#define POLARSSL_ERR_ASN1_OUT_OF_DATA -0x0060 /**< Out of data when parsing an ASN1 data structure. */
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#define POLARSSL_ERR_ASN1_UNEXPECTED_TAG -0x0062 /**< ASN1 tag was of an unexpected value. */
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#define POLARSSL_ERR_ASN1_INVALID_LENGTH -0x0064 /**< Error when trying to determine the length or invalid length. */
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#define POLARSSL_ERR_ASN1_LENGTH_MISMATCH -0x0066 /**< Actual length differs from expected length. */
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#define POLARSSL_ERR_ASN1_INVALID_DATA -0x0068 /**< Data is invalid. (not used) */
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#define POLARSSL_ERR_ASN1_MALLOC_FAILED -0x006A /**< Memory allocation failed */
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#define POLARSSL_ERR_ASN1_BUF_TOO_SMALL -0x006C /**< Buffer too small when writing ASN.1 data structure. */
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/* \} name */
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/**
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* \name DER constants
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* These constants comply with DER encoded the ANS1 type tags.
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* DER encoding uses hexadecimal representation.
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* An example DER sequence is:\n
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* - 0x02 -- tag indicating INTEGER
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* - 0x01 -- length in octets
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* - 0x05 -- value
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* Such sequences are typically read into \c ::x509_buf.
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* \{
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*/
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#define ASN1_BOOLEAN 0x01
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#define ASN1_INTEGER 0x02
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#define ASN1_BIT_STRING 0x03
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#define ASN1_OCTET_STRING 0x04
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#define ASN1_NULL 0x05
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#define ASN1_OID 0x06
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#define ASN1_UTF8_STRING 0x0C
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#define ASN1_SEQUENCE 0x10
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#define ASN1_SET 0x11
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#define ASN1_PRINTABLE_STRING 0x13
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#define ASN1_T61_STRING 0x14
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#define ASN1_IA5_STRING 0x16
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#define ASN1_UTC_TIME 0x17
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#define ASN1_GENERALIZED_TIME 0x18
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#define ASN1_UNIVERSAL_STRING 0x1C
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#define ASN1_BMP_STRING 0x1E
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#define ASN1_PRIMITIVE 0x00
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#define ASN1_CONSTRUCTED 0x20
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#define ASN1_CONTEXT_SPECIFIC 0x80
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/* \} name */
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/* \} addtogroup asn1_module */
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/** Returns the size of the binary string, without the trailing \\0 */
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#define OID_SIZE(x) (sizeof(x) - 1)
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/** Compares two asn1_buf structures for the same OID. Only works for
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* 'defined' oid_str values (OID_HMAC_SHA1), you cannot use a 'unsigned
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* char *oid' here!
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*/
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#define OID_CMP(oid_str, oid_buf) \
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( ( OID_SIZE(oid_str) == (oid_buf)->len ) && \
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memcmp( (oid_str), (oid_buf)->p, (oid_buf)->len) == 0 )
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \name Functions to parse ASN.1 data structures
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* \{
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*/
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/**
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* Type-length-value structure that allows for ASN1 using DER.
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*/
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typedef struct _asn1_buf
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{
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int tag; /**< ASN1 type, e.g. ASN1_UTF8_STRING. */
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size_t len; /**< ASN1 length, e.g. in octets. */
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unsigned char *p; /**< ASN1 data, e.g. in ASCII. */
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}
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asn1_buf;
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/**
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* Container for ASN1 bit strings.
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*/
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typedef struct _asn1_bitstring
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{
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size_t len; /**< ASN1 length, e.g. in octets. */
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unsigned char unused_bits; /**< Number of unused bits at the end of the string */
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unsigned char *p; /**< Raw ASN1 data for the bit string */
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}
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asn1_bitstring;
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/**
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* Container for a sequence of ASN.1 items
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*/
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typedef struct _asn1_sequence
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{
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asn1_buf buf; /**< Buffer containing the given ASN.1 item. */
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struct _asn1_sequence *next; /**< The next entry in the sequence. */
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}
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asn1_sequence;
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/**
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* Container for a sequence or list of 'named' ASN.1 data items
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*/
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typedef struct _asn1_named_data
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{
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asn1_buf oid; /**< The object identifier. */
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asn1_buf val; /**< The named value. */
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struct _asn1_named_data *next; /**< The next entry in the sequence. */
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}
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asn1_named_data;
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/**
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* Get the length of an ASN.1 element.
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* Updates the pointer to immediately behind the length.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param len The variable that will receive the value
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*
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* \return 0 if successful, POLARSSL_ERR_ASN1_OUT_OF_DATA on reaching
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* end of data, POLARSSL_ERR_ASN1_INVALID_LENGTH if length is
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* unparseable.
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*/
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int asn1_get_len( unsigned char **p,
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const unsigned char *end,
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size_t *len );
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/**
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* Get the tag and length of the tag. Check for the requested tag.
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* Updates the pointer to immediately behind the tag and length.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param len The variable that will receive the length
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* \param tag The expected tag
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*
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* \return 0 if successful, POLARSSL_ERR_ASN1_UNEXPECTED_TAG if tag did
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* not match requested tag, or another specific ASN.1 error code.
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*/
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int asn1_get_tag( unsigned char **p,
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const unsigned char *end,
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size_t *len, int tag );
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/**
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* Retrieve a boolean ASN.1 tag and its value.
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* Updates the pointer to immediately behind the full tag.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param val The variable that will receive the value
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*
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* \return 0 if successful or a specific ASN.1 error code.
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*/
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int asn1_get_bool( unsigned char **p,
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const unsigned char *end,
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int *val );
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/**
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* Retrieve an integer ASN.1 tag and its value.
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* Updates the pointer to immediately behind the full tag.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param val The variable that will receive the value
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*
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* \return 0 if successful or a specific ASN.1 error code.
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*/
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int asn1_get_int( unsigned char **p,
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const unsigned char *end,
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int *val );
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/**
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* Retrieve a bitstring ASN.1 tag and its value.
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* Updates the pointer to immediately behind the full tag.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param bs The variable that will receive the value
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*
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* \return 0 if successful or a specific ASN.1 error code.
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*/
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int asn1_get_bitstring( unsigned char **p, const unsigned char *end,
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asn1_bitstring *bs);
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/**
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* Retrieve a bitstring ASN.1 tag without unused bits and its value.
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* Updates the pointer to the beginning of the bit/octet string.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param len Length of the actual bit/octect string in bytes
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*
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* \return 0 if successful or a specific ASN.1 error code.
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*/
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int asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
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size_t *len );
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/**
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* Parses and splits an ASN.1 "SEQUENCE OF <tag>"
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* Updated the pointer to immediately behind the full sequence tag.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param cur First variable in the chain to fill
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* \param tag Type of sequence
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*
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* \return 0 if successful or a specific ASN.1 error code.
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*/
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int asn1_get_sequence_of( unsigned char **p,
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const unsigned char *end,
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asn1_sequence *cur,
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int tag);
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#if defined(POLARSSL_BIGNUM_C)
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/**
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* Retrieve a MPI value from an integer ASN.1 tag.
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* Updates the pointer to immediately behind the full tag.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param X The MPI that will receive the value
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*
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* \return 0 if successful or a specific ASN.1 or MPI error code.
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*/
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int asn1_get_mpi( unsigned char **p,
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const unsigned char *end,
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mpi *X );
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#endif
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/**
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* Retrieve an AlgorithmIdentifier ASN.1 sequence.
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* Updates the pointer to immediately behind the full AlgorithmIdentifier.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param alg The buffer to receive the OID
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* \param params The buffer to receive the params (if any)
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*
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* \return 0 if successful or a specific ASN.1 or MPI error code.
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*/
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int asn1_get_alg( unsigned char **p,
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const unsigned char *end,
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asn1_buf *alg, asn1_buf *params );
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/**
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* Retrieve an AlgorithmIdentifier ASN.1 sequence with NULL or no params.
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* Updates the pointer to immediately behind the full AlgorithmIdentifier.
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*
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* \param p The position in the ASN.1 data
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* \param end End of data
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* \param alg The buffer to receive the OID
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*
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* \return 0 if successful or a specific ASN.1 or MPI error code.
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*/
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int asn1_get_alg_null( unsigned char **p,
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const unsigned char *end,
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asn1_buf *alg );
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/**
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* Find a specific named_data entry in a sequence or list based on the OID.
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*
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* \param list The list to seek through
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* \param oid The OID to look for
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* \param len Size of the OID
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*
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* \return NULL if not found, or a pointer to the existing entry.
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*/
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asn1_named_data *asn1_find_named_data( asn1_named_data *list,
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const char *oid, size_t len );
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/**
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* Free a asn1_named_data entry
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*
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* \param entry The named data entry to free
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*/
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void asn1_free_named_data( asn1_named_data *entry );
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/**
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* Free all entries in a asn1_named_data list
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* Head will be set to NULL
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*
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* \param head Pointer to the head of the list of named data entries to free
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*/
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void asn1_free_named_data_list( asn1_named_data **head );
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#ifdef __cplusplus
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}
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#endif
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#endif /* asn1.h */
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