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/*
* Copyright 2026 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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
*/
#include "ssl_local.h"
/*
* RFC 9147 §5.2: strip msg_seq, fragment_offset, and fragment_length from
* each DTLS handshake message header before feeding into the transcript hash.
* Used by both ssl3_finish_mac and tls13_change_cipher_state.
*/
int dtls13_transcript_hash_update(EVP_MD_CTX *mdctx,
const unsigned char *buf, size_t len)
{
while (len > 0) {
PACKET hmhdr;
unsigned long hmbodylen;
unsigned int msgtype;
size_t hmhdrlen;
if (!ossl_assert(len >= SSL3_HM_HEADER_LENGTH)
|| !PACKET_buf_init(&hmhdr, buf, SSL3_HM_HEADER_LENGTH)
|| !PACKET_get_1(&hmhdr, &msgtype)
|| !PACKET_get_net_3(&hmhdr, &hmbodylen))
return 0;
hmhdrlen = (msgtype == SSL3_MT_MESSAGE_HASH)
? SSL3_HM_HEADER_LENGTH
: DTLS1_HM_HEADER_LENGTH;
if (!ossl_assert(hmhdrlen + hmbodylen <= len)
|| !EVP_DigestUpdate(mdctx, buf, SSL3_HM_HEADER_LENGTH)
|| !EVP_DigestUpdate(mdctx, buf + hmhdrlen, hmbodylen))
return 0;
buf += hmhdrlen + hmbodylen;
len -= hmhdrlen + hmbodylen;
}
return 1;
}
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