/usr/include/mbedtls/asn1write.h is in libmbedtls-dev 2.8.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* \file asn1write.h
*
* \brief ASN.1 buffer writing functionality
*/
/*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#ifndef MBEDTLS_ASN1_WRITE_H
#define MBEDTLS_ASN1_WRITE_H
#include "asn1.h"
#define MBEDTLS_ASN1_CHK_ADD(g, f) do { if( ( ret = f ) < 0 ) return( ret ); else \
g += ret; } while( 0 )
#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 mbedtls_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 mbedtls_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 mbedtls_asn1_write_raw_buffer( unsigned char **p, unsigned char *start,
const unsigned char *buf, size_t size );
#if defined(MBEDTLS_BIGNUM_C)
/**
* \brief Write a big number (MBEDTLS_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 mbedtls_asn1_write_mpi( unsigned char **p, unsigned char *start, const mbedtls_mpi *X );
#endif /* MBEDTLS_BIGNUM_C */
/**
* \brief Write a NULL tag (MBEDTLS_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 mbedtls_asn1_write_null( unsigned char **p, unsigned char *start );
/**
* \brief Write an OID tag (MBEDTLS_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 mbedtls_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
*
* \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
* \param par_len length of parameters, which must be already written.
* If 0, NULL parameters are added
*
* \return the length written or a negative error code
*/
int mbedtls_asn1_write_algorithm_identifier( unsigned char **p, unsigned char *start,
const char *oid, size_t oid_len,
size_t par_len );
/**
* \brief Write a boolean tag (MBEDTLS_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 mbedtls_asn1_write_bool( unsigned char **p, unsigned char *start, int boolean );
/**
* \brief Write an int tag (MBEDTLS_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 mbedtls_asn1_write_int( unsigned char **p, unsigned char *start, int val );
/**
* \brief Write a printable string tag (MBEDTLS_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 mbedtls_asn1_write_printable_string( unsigned char **p, unsigned char *start,
const char *text, size_t text_len );
/**
* \brief Write an IA5 string tag (MBEDTLS_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 mbedtls_asn1_write_ia5_string( unsigned char **p, unsigned char *start,
const char *text, size_t text_len );
/**
* \brief Write a bitstring tag (MBEDTLS_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 mbedtls_asn1_write_bitstring( unsigned char **p, unsigned char *start,
const unsigned char *buf, size_t bits );
/**
* \brief Write an octet string tag (MBEDTLS_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 mbedtls_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.
*/
mbedtls_asn1_named_data *mbedtls_asn1_store_named_data( mbedtls_asn1_named_data **list,
const char *oid, size_t oid_len,
const unsigned char *val,
size_t val_len );
#ifdef __cplusplus
}
#endif
#endif /* MBEDTLS_ASN1_WRITE_H */
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