/** * \file asn1write.h * * \brief ASN.1 buffer writing functionality * * Copyright (C) 2006-2013, Brainspark B.V. * * This file is part of PolarSSL (http://www.polarssl.org) * Lead Maintainer: Paul Bakker * * 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_WRITE_H #define POLARSSL_ASN1_WRITE_H #include "asn1.h" #define ASN1_CHK_ADD(g, f) if( ( ret = f ) < 0 ) return( ret ); else g += ret #ifdef __cplusplus extern "C" { #endif /** * \brief Write a length field in ASN.1 format * Note: function works backwards in data buffer * * \param p reference to current position pointer * \param start start of the buffer (for bounds-checking) * \param len the length to write * * \return the length written or a negative error code */ int asn1_write_len( unsigned char **p, unsigned char *start, size_t len ); /** * \brief Write a ASN.1 tag in ASN.1 format * Note: function works backwards in data buffer * * \param p reference to current position pointer * \param start start of the buffer (for bounds-checking) * \param tag the tag to write * * \return the length written or a negative error code */ int asn1_write_tag( unsigned char **p, unsigned char *start, unsigned char tag ); /** * \brief Write raw buffer data * Note: function works backwards in data buffer * * \param p reference to current position pointer * \param start start of the buffer (for bounds-checking) * \param buf data buffer to write * \param size length of the data buffer * * \return the length written or a negative error code */ int asn1_write_raw_buffer( unsigned char **p, unsigned char *start, const unsigned char *buf, size_t size ); #if defined(POLARSSL_BIGNUM_C) /** * \brief Write a big number (ASN1_INTEGER) in ASN.1 format * Note: function works backwards in data buffer * * \param p reference to current position pointer * \param start start of the buffer (for bounds-checking) * \param X the MPI to write * * \return the length written or a negative error code */ int asn1_write_mpi( unsigned char **p, unsigned char *start, mpi *X ); #endif /** * \brief Write a NULL tag (ASN1_NULL) with zero data in ASN.1 format * Note: function works backwards in data buffer * * \param p reference to current position pointer * \param start start of the buffer (for bounds-checking) * * \return the length written or a negative error code */ int asn1_write_null( unsigned char **p, unsigned char *start ); /** * \brief Write an OID tag (ASN1_OID) and data in ASN.1 format * Note: function works backwards in data buffer * * \param p reference to current position pointer * \param start start of the buffer (for bounds-checking) * \param oid the OID to write * \param oid_len length of the OID * * \return the length written or a negative error code */ int asn1_write_oid( unsigned char **p, unsigned char *start, const char *oid, size_t oid_len ); /** * \brief Write an AlgorithmIdentifier sequence in ASN.1 format * Note: function works backwards in data buffer * Note: Uses NULL as algorithm parameter * * \param p reference to current position pointer * \param start start of the buffer (for bounds-checking) * \param oid the OID of the algorithm * \param oid_len length of the OID * * \return the length written or a negative error code */ int asn1_write_algorithm_identifier( unsigned char **p, unsigned char *start, const char *oid, size_t oid_len ); /** * \brief Write a boolean tag (ASN1_BOOLEAN) and value in ASN.1 format * Note: function works backwards in data buffer * * \param p reference to current position pointer * \param start start of the buffer (for bounds-checking) * \param boolean 0 or 1 * * \return the length written or a negative error code */ int asn1_write_bool( unsigned char **p, unsigned char *start, int boolean ); /** * \brief Write an int tag (ASN1_INTEGER) and value in ASN.1 format * Note: function works backwards in data buffer * * \param p reference to current position pointer * \param start start of the buffer (for bounds-checking) * \param val the integer value * * \return the length written or a negative error code */ int asn1_write_int( unsigned char **p, unsigned char *start, int val ); /** * \brief Write a printable string tag (ASN1_PRINTABLE_STRING) and * value in ASN.1 format * Note: function works backwards in data buffer * * \param p reference to current position pointer * \param start start of the buffer (for bounds-checking) * \param text the text to write * \param text_len length of the text * * \return the length written or a negative error code */ int asn1_write_printable_string( unsigned char **p, unsigned char *start, const char *text, size_t text_len ); /** * \brief Write an IA5 string tag (ASN1_IA5_STRING) and * value in ASN.1 format * Note: function works backwards in data buffer * * \param p reference to current position pointer * \param start start of the buffer (for bounds-checking) * \param text the text to write * \param text_len length of the text * * \return the length written or a negative error code */ int asn1_write_ia5_string( unsigned char **p, unsigned char *start, const char *text, size_t text_len ); /** * \brief Write a bitstring tag (ASN1_BIT_STRING) and * value in ASN.1 format * Note: function works backwards in data buffer * * \param p reference to current position pointer * \param start start of the buffer (for bounds-checking) * \param buf the bitstring * \param bits the total number of bits in the bitstring * * \return the length written or a negative error code */ int asn1_write_bitstring( unsigned char **p, unsigned char *start, const unsigned char *buf, size_t bits ); /** * \brief Write an octet string tag (ASN1_OCTET_STRING) and * value in ASN.1 format * Note: function works backwards in data buffer * * \param p reference to current position pointer * \param start start of the buffer (for bounds-checking) * \param buf data buffer to write * \param size length of the data buffer * * \return the length written or a negative error code */ int asn1_write_octet_string( unsigned char **p, unsigned char *start, const unsigned char *buf, size_t size ); /** * \brief Create or find a specific named_data entry for writing in a * sequence or list based on the OID. If not already in there, * a new entry is added to the head of the list. * Warning: Destructive behaviour for the val data! * * \param list Pointer to the location of the head of the list to seek * through (will be updated in case of a new entry) * \param oid The OID to look for * \param oid_len Size of the OID * \param val Data to store (can be NULL if you want to fill it by hand) * \param val_len Minimum length of the data buffer needed * * \return NULL if if there was a memory allocation error, or a pointer * to the new / existing entry. */ asn1_named_data *asn1_store_named_data( asn1_named_data **list, const char *oid, size_t oid_len, const unsigned char *val, size_t val_len ); #ifdef __cplusplus } #endif #endif /* POLARSSL_ASN1_WRITE_H */