247 lines
9.4 KiB
C
247 lines
9.4 KiB
C
/**
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* \file asn1write.h
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*
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* \brief ASN.1 buffer writing functionality
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#ifndef MBEDTLS_ASN1_WRITE_H
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#define MBEDTLS_ASN1_WRITE_H
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#include "asn1.h"
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#define MBEDTLS_ASN1_CHK_ADD(g, f) \
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do { \
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if ((ret = f) < 0) \
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return (ret); \
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else \
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g += ret; \
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} while (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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* \brief Write a length field in ASN.1 format
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* Note: function works backwards in data buffer
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*
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* \param p reference to current position pointer
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* \param start start of the buffer (for bounds-checking)
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* \param len the length to write
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_asn1_write_len(unsigned char **p, unsigned char *start, size_t len);
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/**
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* \brief Write a ASN.1 tag in ASN.1 format
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* Note: function works backwards in data buffer
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*
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* \param p reference to current position pointer
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* \param start start of the buffer (for bounds-checking)
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* \param tag the tag to write
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_asn1_write_tag(unsigned char **p, unsigned char *start,
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unsigned char tag);
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/**
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* \brief Write raw buffer data
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* Note: function works backwards in data buffer
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*
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* \param p reference to current position pointer
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* \param start start of the buffer (for bounds-checking)
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* \param buf data buffer to write
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* \param size length of the data buffer
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_asn1_write_raw_buffer(unsigned char **p, unsigned char *start,
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const unsigned char *buf, size_t size);
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#if defined(MBEDTLS_BIGNUM_C)
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/**
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* \brief Write a big number (MBEDTLS_ASN1_INTEGER) in ASN.1 format
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* Note: function works backwards in data buffer
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*
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* \param p reference to current position pointer
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* \param start start of the buffer (for bounds-checking)
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* \param X the MPI to write
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_asn1_write_mpi(unsigned char **p, unsigned char *start,
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const mbedtls_mpi *X);
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#endif /* MBEDTLS_BIGNUM_C */
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/**
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* \brief Write a NULL tag (MBEDTLS_ASN1_NULL) with zero data in ASN.1
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* format Note: function works backwards in data buffer
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*
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* \param p reference to current position pointer
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* \param start start of the buffer (for bounds-checking)
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_asn1_write_null(unsigned char **p, unsigned char *start);
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/**
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* \brief Write an OID tag (MBEDTLS_ASN1_OID) and data in ASN.1 format
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* Note: function works backwards in data buffer
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*
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* \param p reference to current position pointer
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* \param start start of the buffer (for bounds-checking)
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* \param oid the OID to write
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* \param oid_len length of the OID
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_asn1_write_oid(unsigned char **p, unsigned char *start,
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const char *oid, size_t oid_len);
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/**
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* \brief Write an AlgorithmIdentifier sequence in ASN.1 format
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* Note: function works backwards in data buffer
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*
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* \param p reference to current position pointer
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* \param start start of the buffer (for bounds-checking)
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* \param oid the OID of the algorithm
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* \param oid_len length of the OID
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* \param par_len length of parameters, which must be already written.
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* If 0, NULL parameters are added
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_asn1_write_algorithm_identifier(unsigned char **p,
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unsigned char *start,
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const char *oid, size_t oid_len,
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size_t par_len);
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/**
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* \brief Write a boolean tag (MBEDTLS_ASN1_BOOLEAN) and value in
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* ASN.1 format Note: function works backwards in data buffer
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*
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* \param p reference to current position pointer
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* \param start start of the buffer (for bounds-checking)
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* \param boolean 0 or 1
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_asn1_write_bool(unsigned char **p, unsigned char *start,
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int boolean);
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/**
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* \brief Write an int tag (MBEDTLS_ASN1_INTEGER) and value in ASN.1
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* format Note: function works backwards in data buffer
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*
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* \param p reference to current position pointer
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* \param start start of the buffer (for bounds-checking)
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* \param val the integer value
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_asn1_write_int(unsigned char **p, unsigned char *start, int val);
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/**
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* \brief Write a printable string tag (MBEDTLS_ASN1_PRINTABLE_STRING)
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* and value in ASN.1 format Note: function works backwards in data buffer
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*
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* \param p reference to current position pointer
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* \param start start of the buffer (for bounds-checking)
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* \param text the text to write
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* \param text_len length of the text
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_asn1_write_printable_string(unsigned char **p, unsigned char *start,
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const char *text, size_t text_len);
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/**
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* \brief Write an IA5 string tag (MBEDTLS_ASN1_IA5_STRING) and
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* value in ASN.1 format
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* Note: function works backwards in data buffer
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*
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* \param p reference to current position pointer
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* \param start start of the buffer (for bounds-checking)
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* \param text the text to write
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* \param text_len length of the text
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_asn1_write_ia5_string(unsigned char **p, unsigned char *start,
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const char *text, size_t text_len);
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/**
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* \brief Write a bitstring tag (MBEDTLS_ASN1_BIT_STRING) and
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* value in ASN.1 format
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* Note: function works backwards in data buffer
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*
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* \param p reference to current position pointer
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* \param start start of the buffer (for bounds-checking)
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* \param buf the bitstring
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* \param bits the total number of bits in the bitstring
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_asn1_write_bitstring(unsigned char **p, unsigned char *start,
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const unsigned char *buf, size_t bits);
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/**
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* \brief Write an octet string tag (MBEDTLS_ASN1_OCTET_STRING) and
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* value in ASN.1 format
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* Note: function works backwards in data buffer
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*
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* \param p reference to current position pointer
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* \param start start of the buffer (for bounds-checking)
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* \param buf data buffer to write
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* \param size length of the data buffer
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_asn1_write_octet_string(unsigned char **p, unsigned char *start,
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const unsigned char *buf, size_t size);
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/**
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* \brief Create or find a specific named_data entry for writing in a
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* sequence or list based on the OID. If not already in there,
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* a new entry is added to the head of the list.
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* Warning: Destructive behaviour for the val data!
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*
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* \param list Pointer to the location of the head of the list to seek
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* through (will be updated in case of a new entry)
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* \param oid The OID to look for
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* \param oid_len Size of the OID
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* \param val Data to store (can be NULL if you want to fill it by hand)
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* \param val_len Minimum length of the data buffer needed
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*
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* \return NULL if if there was a memory allocation error, or a pointer
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* to the new / existing entry.
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*/
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mbedtls_asn1_named_data *
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mbedtls_asn1_store_named_data(mbedtls_asn1_named_data **list, const char *oid,
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size_t oid_len, const unsigned char *val,
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size_t val_len);
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#ifdef __cplusplus
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}
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#endif
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#endif /* MBEDTLS_ASN1_WRITE_H */
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