/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #ifndef ISC_BASE32_H #define ISC_BASE32_H 1 /*! \file */ /* * Routines for manipulating base 32 and base 32 hex encoded data. * Based on RFC 4648. * * Base 32 hex preserves the sort order of data when it is encoded / * decoded. * * Base 32 hex "np" is base 32 hex but no padding is produced or accepted. */ #include <isc/lang.h> #include <isc/types.h> ISC_LANG_BEGINDECLS /*** *** Functions ***/ isc_result_t isc_base32_totext(isc_region_t *source, int wordlength, const char *wordbreak, isc_buffer_t *target); isc_result_t isc_base32hex_totext(isc_region_t *source, int wordlength, const char *wordbreak, isc_buffer_t *target); isc_result_t isc_base32hexnp_totext(isc_region_t *source, int wordlength, const char *wordbreak, isc_buffer_t *target); /*!< * \brief Convert data into base32 encoded text. * * Notes: *\li The base32 encoded text in 'target' will be divided into * words of at most 'wordlength' characters, separated by * the 'wordbreak' string. No parentheses will surround * the text. * * Requires: *\li 'source' is a region containing binary data *\li 'target' is a text buffer containing available space *\li 'wordbreak' points to a null-terminated string of * zero or more whitespace characters * * Ensures: *\li target will contain the base32 encoded version of the data * in source. The 'used' pointer in target will be advanced as * necessary. */ isc_result_t isc_base32_decodestring(const char *cstr, isc_buffer_t *target); isc_result_t isc_base32hex_decodestring(const char *cstr, isc_buffer_t *target); isc_result_t isc_base32hexnp_decodestring(const char *cstr, isc_buffer_t *target); /*!< * \brief Decode a null-terminated string in base32, base32hex, or * base32hex non-padded. * * Requires: *\li 'cstr' is non-null. *\li 'target' is a valid buffer. * * Returns: *\li #ISC_R_SUCCESS -- the entire decoded representation of 'cstring' * fit in 'target'. *\li #ISC_R_BADBASE32 -- 'cstr' is not a valid base32 encoding. * * Other error returns are any possible error code from: *\li isc_lex_create(), *\li isc_lex_openbuffer(), *\li isc_base32_tobuffer(). */ isc_result_t isc_base32_tobuffer(isc_lex_t *lexer, isc_buffer_t *target, int length); isc_result_t isc_base32hex_tobuffer(isc_lex_t *lexer, isc_buffer_t *target, int length); isc_result_t isc_base32hexnp_tobuffer(isc_lex_t *lexer, isc_buffer_t *target, int length); /*!< * \brief Convert text encoded in base32, base32hex, or base32hex * non-padded from a lexer context into `target`. If 'length' is * non-negative, it is the expected number of encoded octets to convert. * * If 'length' is -1 then 0 or more encoded octets are expected. * If 'length' is -2 then 1 or more encoded octets are expected. * * Returns: *\li #ISC_R_BADBASE32 -- invalid base32 encoding. *\li #ISC_R_UNEXPECTEDEND: the text does not contain the expected * number of encoded octets. * * Requires: *\li 'lexer' is a valid lexer context *\li 'target' is a buffer containing binary data *\li 'length' is -2, -1, or non-negative * * Ensures: *\li target will contain the data represented by the base32 encoded * string parsed by the lexer. No more than `length` octets will * be read, if `length` is non-negative. The 'used' pointer in * 'target' will be advanced as necessary. */ isc_result_t isc_base32_decoderegion(isc_region_t *source, isc_buffer_t *target); isc_result_t isc_base32hex_decoderegion(isc_region_t *source, isc_buffer_t *target); isc_result_t isc_base32hexnp_decoderegion(isc_region_t *source, isc_buffer_t *target); /*!< * \brief Decode a packed (no white space permitted) region in * base32, base32hex or base32hex non-padded. * * Requires: *\li 'source' is a valid region. *\li 'target' is a valid buffer. * * Returns: *\li #ISC_R_SUCCESS -- the entire decoded representation of 'cstring' * fit in 'target'. *\li #ISC_R_BADBASE32 -- 'source' is not a valid base32 encoding. */ ISC_LANG_ENDDECLS #endif /* ISC_BASE32_H */