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-/**
- * \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 -0x0060 /**< Out of data when parsing an ASN1 data structure. */
-#define POLARSSL_ERR_ASN1_UNEXPECTED_TAG -0x0062 /**< ASN1 tag was of an unexpected value. */
-#define POLARSSL_ERR_ASN1_INVALID_LENGTH -0x0064 /**< Error when trying to determine the length or invalid length. */
-#define POLARSSL_ERR_ASN1_LENGTH_MISMATCH -0x0066 /**< Actual length differs from expected length. */
-#define POLARSSL_ERR_ASN1_INVALID_DATA -0x0068 /**< Data is invalid. (not used) */
-#define POLARSSL_ERR_ASN1_MALLOC_FAILED -0x006A /**< Memory allocation failed */
-#define POLARSSL_ERR_ASN1_BUF_TOO_SMALL -0x006C /**< Buffer too small when writing ASN.1 data structure. */
-
-/* \} 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 */