| /* |
| * Copyright 2024 The OpenSSL Project Authors. All Rights Reserved. |
| * Licensed under the OpenSSL license (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| /* |
| * These functions are ECH helpers that are used within the library but |
| * also by ECH test code. |
| */ |
| |
| #ifndef OPENSSL_ECH_HELPERS_H |
| # define OPENSSL_ECH_HELPERS_H |
| # pragma once |
| |
| # ifndef OPENSSL_NO_ECH |
| |
| /* |
| * the max HPKE 'info' we'll process is the max ECHConfig size |
| * (OSSL_ECH_MAX_ECHCONFIG_LEN) plus OSSL_ECH_CONTEXT_STRING(len=7) + 1 |
| */ |
| # define OSSL_ECH_MAX_INFO_LEN (OSSL_ECH_MAX_ECHCONFIG_LEN + 8) |
| |
| int ossl_ech_make_enc_info(const unsigned char *encoding, |
| size_t encoding_length, |
| unsigned char *info, size_t *info_len); |
| |
| /* |
| * Given a CH find the offsets of the session id, extensions and ECH |
| * ch is the encoded client hello |
| * ch_len is the length of ch |
| * sessid_off returns offset of session_id length |
| * exts_off points to offset of extensions |
| * exts_len returns length of extensions |
| * ech_off returns offset of ECH |
| * echtype returns the ext type of the ECH |
| * ech_len returns the length of the ECH |
| * sni_off returns offset of (outer) SNI |
| * sni_len returns the length of the SNI |
| * inner 1 if the ECH is marked as an inner, 0 for outer |
| * return 1 for success, other otherwise |
| * |
| * Offsets are set to zero if relevant thing not found. |
| * Offsets are returned to the type or length field in question. |
| * |
| * Note: input here is untrusted! |
| */ |
| int ossl_ech_helper_get_ch_offsets(const unsigned char *ch, size_t ch_len, |
| size_t *sessid_off, size_t *exts_off, |
| size_t *exts_len, |
| size_t *ech_off, uint16_t *echtype, |
| size_t *ech_len, size_t *sni_off, |
| size_t *sni_len, int *inner); |
| |
| # endif |
| #endif |
