diff --git a/include/mbedtls/asn1write.h b/include/mbedtls/asn1write.h index 59e5d529a..76c1780b5 100644 --- a/include/mbedtls/asn1write.h +++ b/include/mbedtls/asn1write.h @@ -26,139 +26,171 @@ #include "asn1.h" -#define MBEDTLS_ASN1_CHK_ADD(g, f) do { if( ( ret = f ) < 0 ) return( ret ); else \ - g += ret; } while( 0 ) +#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 + * \brief Write a length field in ASN.1 format. * - * \param p reference to current position pointer - * \param start start of the buffer (for bounds-checking) - * \param len the length to write + * \note This function works backwards in data buffer. * - * \return the length written or a negative error code + * \param p The reference to the current position pointer. + * \param start The start of the buffer, for bounds-checking. + * \param len The length value to write. + * + * \return The number of bytes written to \p p on success. + * \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure. */ -int mbedtls_asn1_write_len( unsigned char **p, unsigned char *start, size_t len ); - +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 + * \brief Write an ASN.1 tag in ASN.1 format. * - * \param p reference to current position pointer - * \param start start of the buffer (for bounds-checking) - * \param tag the tag to write + * \note This function works backwards in data buffer. * - * \return the length written or a negative error code + * \param p The reference to the current position pointer. + * \param start The start of the buffer, for bounds-checking. + * \param tag The tag to write. + * + * \return The number of bytes written to \p p on success. + * \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure. */ int mbedtls_asn1_write_tag( unsigned char **p, unsigned char *start, - unsigned char tag ); + unsigned char tag ); /** - * \brief Write raw buffer data - * Note: function works backwards in data buffer + * \brief Write raw buffer data. * - * \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 + * \note This function works backwards in data buffer. * - * \return the length written or a negative error code + * \param p The reference to the current position pointer. + * \param start The start of the buffer, for bounds-checking. + * \param buf The data buffer to write. + * \param size The length of the data buffer. + * + * \return The number of bytes written to \p p on success. + * \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure. */ int mbedtls_asn1_write_raw_buffer( unsigned char **p, unsigned char *start, - const unsigned char *buf, size_t size ); + 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 + * \brief Write a arbitrary-precision number (#MBEDTLS_ASN1_INTEGER) + * in ASN.1 format. * - * \param p reference to current position pointer - * \param start start of the buffer (for bounds-checking) - * \param X the MPI to write + * \note This function works backwards in data buffer. * - * \return the length written or a negative error code + * \param p The reference to the current position pointer. + * \param start The start of the buffer, for bounds-checking. + * \param X The MPI to write. + * + * \return The number of bytes written to \p p on success. + * \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure. */ -int mbedtls_asn1_write_mpi( unsigned char **p, unsigned char *start, const mbedtls_mpi *X ); +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 + * \brief Write a NULL tag (#MBEDTLS_ASN1_NULL) with zero data + * in ASN.1 format. * - * \param p reference to current position pointer - * \param start start of the buffer (for bounds-checking) + * \note This function works backwards in data buffer. * - * \return the length written or a negative error code + * \param p The reference to the current position pointer. + * \param start The start of the buffer, for bounds-checking. + * + * \return The number of bytes written to \p p on success. + * \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure. */ 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 + * \brief Write an OID tag (#MBEDTLS_ASN1_OID) and data + * in ASN.1 format. * - * \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 + * \note This function works backwards in data buffer. * - * \return the length written or a negative error code + * \param p The reference to the current position pointer. + * \param start The start of the buffer, for bounds-checking. + * \param oid The OID to write. + * \param oid_len The length of the OID. + * + * \return The number of bytes written to \p p on success. + * \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure. */ int mbedtls_asn1_write_oid( unsigned char **p, unsigned char *start, - const char *oid, size_t oid_len ); + const char *oid, size_t oid_len ); /** - * \brief Write an AlgorithmIdentifier sequence in ASN.1 format - * Note: function works backwards in data buffer + * \brief Write an AlgorithmIdentifier sequence in ASN.1 format. * - * \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. + * \note This function works backwards in data buffer. + * + * \param p The reference to the current position pointer. + * \param start The start of the buffer, for bounds-checking. + * \param oid The OID of the algorithm to write. + * \param oid_len The length of the algorithm's OID. + * \param par_len The length of the parameters, which must be already written. * If 0, NULL parameters are added * - * \return the length written or a negative error code + * \return The number of bytes written to \p p on success. + * \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure. */ -int mbedtls_asn1_write_algorithm_identifier( unsigned char **p, unsigned char *start, - const char *oid, size_t oid_len, - size_t par_len ); +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 + * \brief Write a boolean tag (#MBEDTLS_ASN1_BOOLEAN) and value + * in ASN.1 format. * - * \param p reference to current position pointer - * \param start start of the buffer (for bounds-checking) - * \param boolean 0 or 1 + * \note This function works backwards in data buffer. * - * \return the length written or a negative error code + * \param p The reference to the current position pointer. + * \param start The start of the buffer, for bounds-checking. + * \param boolean The boolean value to write, either \c 0 or \c 1. + * + * \return The number of bytes written to \p p on success. + * \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure. */ -int mbedtls_asn1_write_bool( unsigned char **p, unsigned char *start, int boolean ); +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 + * \brief Write an int tag (#MBEDTLS_ASN1_INTEGER) and value + * in ASN.1 format. * - * \param p reference to current position pointer - * \param start start of the buffer (for bounds-checking) - * \param val the integer value + * \note This function works backwards in data buffer. * - * \return the length written or a negative error code + * \param p The reference to the current position pointer. + * \param start The start of the buffer, for bounds-checking. + * \param val The integer value to write. + * + * \return The number of bytes written to \p p on success. + * \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure. */ int mbedtls_asn1_write_int( unsigned char **p, unsigned char *start, int val ); /** * \brief Write a string in ASN.1 format using a specific * string encoding tag. - * Note: function works backwards in data buffer + + * \note This function works backwards in data buffer. * * \param p The reference to the current position pointer. - * \param start The start of the buffer (for bounds-checking). + * \param start The start of the buffer, for bounds-checking. * \param tag The string encoding tag to write, e.g. * #MBEDTLS_ASN1_UTF8_STRING. * \param text The string to write. @@ -169,15 +201,17 @@ int mbedtls_asn1_write_int( unsigned char **p, unsigned char *start, int val ); * \return A negative error code on failure. */ int mbedtls_asn1_write_tagged_string( unsigned char **p, unsigned char *start, - int tag, const char *text, size_t text_len ); + int tag, const char *text, + size_t text_len ); /** * \brief Write a string in ASN.1 format using the PrintableString * string encoding tag (#MBEDTLS_ASN1_PRINTABLE_STRING). - * Note: The function works backwards in data buffer. + * + * \note This function works backwards in data buffer. * * \param p The reference to the current position pointer. - * \param start The start of the buffer (for bounds-checking). + * \param start The start of the buffer, for bounds-checking. * \param text The string to write. * \param text_len The length of \p text in bytes (which might * be strictly larger than the number of characters). @@ -192,10 +226,11 @@ int mbedtls_asn1_write_printable_string( unsigned char **p, /** * \brief Write a UTF8 string in ASN.1 format using the UTF8String * string encoding tag (#MBEDTLS_ASN1_PRINTABLE_STRING). - * Note: The function works backwards in data buffer. + * + * \note This function works backwards in data buffer. * * \param p The reference to the current position pointer. - * \param start The start of the buffer (for bounds-checking). + * \param start The start of the buffer, for bounds-checking. * \param text The string to write. * \param text_len The length of \p text in bytes (which might * be strictly larger than the number of characters). @@ -207,12 +242,13 @@ int mbedtls_asn1_write_utf8_string( unsigned char **p, unsigned char *start, const char *text, size_t text_len ); /** - * \brief Write a string in ASN.1 format using the IA5tring + * \brief Write a string in ASN.1 format using the IA5String * string encoding tag (#MBEDTLS_ASN1_IA5_STRING). - * Note: The function works backwards in data buffer. + * + * \note This function works backwards in data buffer. * * \param p The reference to the current position pointer. - * \param start The start of the buffer (for bounds-checking). + * \param start The start of the buffer, for bounds-checking. * \param text The string to write. * \param text_len The length of \p text in bytes (which might * be strictly larger than the number of characters). @@ -224,34 +260,38 @@ 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 + * \brief Write a bitstring tag (#MBEDTLS_ASN1_BIT_STRING) and + * value in ASN.1 format. * - * \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 + * \note This function works backwards in data buffer. * - * \return the length written or a negative error code + * \param p The reference to the current position pointer. + * \param start The start of the buffer, for bounds-checking. + * \param buf The bitstring to write. + * \param bits The total number of bits in the bitstring. + * + * \return The number of bytes written to \p p on success. + * \return A negative error code on failure. */ int mbedtls_asn1_write_bitstring( unsigned char **p, unsigned char *start, - const unsigned char *buf, size_t bits ); + 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 + * \brief Write an octet string tag (#MBEDTLS_ASN1_OCTET_STRING) + * and value in ASN.1 format. * - * \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 + * \note This function works backwards in data buffer. * - * \return the length written or a negative error code + * \param p The reference to the current position pointer. + * \param start The start of the buffer, for bounds-checking. + * \param buf The buffer holding the data to write. + * \param size The length of the data buffer \p buf. + * + * \return The number of bytes written to \p p on success. + * \return A negative error code on failure. */ int mbedtls_asn1_write_octet_string( unsigned char **p, unsigned char *start, - const unsigned char *buf, size_t size ); + const unsigned char *buf, size_t size ); /** * \brief Create or find a specific named_data entry for writing in a @@ -259,15 +299,16 @@ int mbedtls_asn1_write_octet_string( unsigned char **p, unsigned char *start, * 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 + * \param list The 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 The size of the OID. + * \param val The data to store (can be \c NULL if you want to fill + * it by hand). + * \param val_len The 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. + * \return A pointer to the new / existing entry on success. + * \return \c NULL if if there was a memory allocation error. */ mbedtls_asn1_named_data *mbedtls_asn1_store_named_data( mbedtls_asn1_named_data **list, const char *oid, size_t oid_len,