370 lines
15 KiB
C
370 lines
15 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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/*
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* Copyright The Mbed TLS Contributors
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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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#ifndef MBEDTLS_ASN1_WRITE_H
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#define MBEDTLS_ASN1_WRITE_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include "mbedtls/asn1.h"
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#define MBEDTLS_ASN1_CHK_ADD(g, f) \
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do \
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{ \
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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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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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* \param len The length value to write.
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure.
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*/
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int mbedtls_asn1_write_len( unsigned char **p, const unsigned char *start,
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size_t len );
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/**
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* \brief Write an ASN.1 tag in ASN.1 format.
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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The 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 number of bytes written to \p p on success.
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* \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure.
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*/
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int mbedtls_asn1_write_tag( unsigned char **p, const 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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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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* \param buf The data buffer to write.
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* \param size The length of the data buffer.
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure.
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*/
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int mbedtls_asn1_write_raw_buffer( unsigned char **p, const 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 arbitrary-precision number (#MBEDTLS_ASN1_INTEGER)
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* in ASN.1 format.
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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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* \param X The MPI to write.
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* It must be non-negative.
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure.
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*/
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int mbedtls_asn1_write_mpi( unsigned char **p, const 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
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* in ASN.1 format.
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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure.
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*/
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int mbedtls_asn1_write_null( unsigned char **p, const unsigned char *start );
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/**
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* \brief Write an OID tag (#MBEDTLS_ASN1_OID) and data
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* in ASN.1 format.
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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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* \param oid The OID to write.
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* \param oid_len The length of the OID.
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure.
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*/
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int mbedtls_asn1_write_oid( unsigned char **p, const 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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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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* \param oid The OID of the algorithm to write.
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* \param oid_len The length of the algorithm's OID.
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* \param par_len The length of the 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 number of bytes written to \p p on success.
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* \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure.
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*/
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int mbedtls_asn1_write_algorithm_identifier( unsigned char **p,
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const 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
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* in ASN.1 format.
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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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* \param boolean The boolean value to write, either \c 0 or \c 1.
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure.
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*/
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int mbedtls_asn1_write_bool( unsigned char **p, const 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
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* in ASN.1 format.
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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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* \param val The integer value to write.
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* It must be non-negative.
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure.
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*/
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int mbedtls_asn1_write_int( unsigned char **p, const unsigned char *start, int val );
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/**
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* \brief Write an enum tag (#MBEDTLS_ASN1_ENUMERATED) and value
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* in ASN.1 format.
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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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* \param val The integer value to write.
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure.
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*/
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int mbedtls_asn1_write_enum( unsigned char **p, const unsigned char *start, int val );
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/**
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* \brief Write a string in ASN.1 format using a specific
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* string encoding tag.
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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* \param tag The string encoding tag to write, e.g.
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* #MBEDTLS_ASN1_UTF8_STRING.
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* \param text The string to write.
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* \param text_len The length of \p text in bytes (which might
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* be strictly larger than the number of characters).
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_asn1_write_tagged_string( unsigned char **p, const unsigned char *start,
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int tag, const char *text,
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size_t text_len );
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/**
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* \brief Write a string in ASN.1 format using the PrintableString
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* string encoding tag (#MBEDTLS_ASN1_PRINTABLE_STRING).
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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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* \param text The string to write.
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* \param text_len The length of \p text in bytes (which might
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* be strictly larger than the number of characters).
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_asn1_write_printable_string( unsigned char **p,
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const 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 UTF8 string in ASN.1 format using the UTF8String
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* string encoding tag (#MBEDTLS_ASN1_UTF8_STRING).
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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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* \param text The string to write.
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* \param text_len The length of \p text in bytes (which might
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* be strictly larger than the number of characters).
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_asn1_write_utf8_string( unsigned char **p, const 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 string in ASN.1 format using the IA5String
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* string encoding tag (#MBEDTLS_ASN1_IA5_STRING).
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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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* \param text The string to write.
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* \param text_len The length of \p text in bytes (which might
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* be strictly larger than the number of characters).
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_asn1_write_ia5_string( unsigned char **p, const 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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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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* \param buf The bitstring to write.
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* \param bits The total number of bits in the bitstring.
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_asn1_write_bitstring( unsigned char **p, const unsigned char *start,
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const unsigned char *buf, size_t bits );
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/**
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* \brief This function writes a named bitstring tag
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* (#MBEDTLS_ASN1_BIT_STRING) and value in ASN.1 format.
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*
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* As stated in RFC 5280 Appendix B, trailing zeroes are
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* omitted when encoding named bitstrings in DER.
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*
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* \note This function works backwards within the data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer which is used for bounds-checking.
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* \param buf The bitstring to write.
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* \param bits The total number of bits in the bitstring.
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_asn1_write_named_bitstring( unsigned char **p,
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const unsigned char *start,
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const unsigned char *buf,
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size_t bits );
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/**
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* \brief Write an octet string tag (#MBEDTLS_ASN1_OCTET_STRING)
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* and value in ASN.1 format.
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*
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* \note This function works backwards in data buffer.
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*
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* \param p The reference to the current position pointer.
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* \param start The start of the buffer, for bounds-checking.
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* \param buf The buffer holding the data to write.
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* \param size The length of the data buffer \p buf.
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*
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* \return The number of bytes written to \p p on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_asn1_write_octet_string( unsigned char **p, const 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 The 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 The size of the OID.
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* \param val The associated data to store. If this is \c NULL,
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* no data is copied to the new or existing buffer.
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* \param val_len The minimum length of the data buffer needed.
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* If this is 0, do not allocate a buffer for the associated
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* data.
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* If the OID was already present, enlarge, shrink or free
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* the existing buffer to fit \p val_len.
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*
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* \return A pointer to the new / existing entry on success.
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* \return \c NULL if if there was a memory allocation error.
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*/
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mbedtls_asn1_named_data *mbedtls_asn1_store_named_data( mbedtls_asn1_named_data **list,
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const char *oid, size_t oid_len,
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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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