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/*
* Copyright 2022-2025 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"
#include "../record_local.h"
#include "recmethod_local.h"
#if defined(OPENSSL_SMALL_FOOTPRINT) \
|| !(defined(AES_ASM) && (defined(__x86_64) \
|| defined(__x86_64__) \
|| defined(_M_AMD64) \
|| defined(_M_X64)))
# undef EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
# define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0
#endif
static int tls_is_multiblock_capable(OSSL_RECORD_LAYER *rl, uint8_t type,
size_t len, size_t fraglen)
{
#if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
if (type == SSL3_RT_APPLICATION_DATA
&& len >= 4 * fraglen
&& rl->compctx == NULL
&& rl->msg_callback == NULL
&& !rl->use_etm
&& RLAYER_USE_EXPLICIT_IV(rl)
&& !BIO_get_ktls_send(rl->bio)
&& (EVP_CIPHER_get_flags(EVP_CIPHER_CTX_get0_cipher(rl->enc_ctx))
& EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK) != 0)
return 1;
#endif
return 0;
}
size_t tls_get_max_records_multiblock(OSSL_RECORD_LAYER *rl, uint8_t type,
size_t len, size_t maxfrag,
size_t *preffrag)
{
if (tls_is_multiblock_capable(rl, type, len, *preffrag)) {
/* minimize address aliasing conflicts */
if ((*preffrag & 0xfff) == 0)
*preffrag -= 512;
if (len >= 8 * (*preffrag))
return 8;
return 4;
}
return tls_get_max_records_default(rl, type, len, maxfrag, preffrag);
}
/*
* Write records using the multiblock method.
*
* Returns 1 on success, 0 if multiblock isn't suitable (non-fatal error), or
* -1 on fatal error.
*/
static int tls_write_records_multiblock_int(OSSL_RECORD_LAYER *rl,
OSSL_RECORD_TEMPLATE *templates,
size_t numtempl)
{
#if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
size_t i;
size_t totlen;
TLS_BUFFER *wb;
unsigned char aad[13];
EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM mb_param;
size_t packlen;
int packleni;
if (numtempl != 4 && numtempl != 8)
return 0;
/*
* Check templates have contiguous buffers and are all the same type and
* length
*/
for (i = 1; i < numtempl; i++) {
if (templates[i - 1].type != templates[i].type
|| templates[i - 1].buflen != templates[i].buflen
|| templates[i - 1].buf + templates[i - 1].buflen
!= templates[i].buf)
return 0;
}
totlen = templates[0].buflen * numtempl;
if (!tls_is_multiblock_capable(rl, templates[0].type, totlen,
templates[0].buflen))
return 0;
/*
* If we get this far, then multiblock is suitable
* Depending on platform multi-block can deliver several *times*
* better performance. Downside is that it has to allocate
* jumbo buffer to accommodate up to 8 records, but the
* compromise is considered worthy.
*/
/*
* Allocate jumbo buffer. This will get freed next time we do a non
* multiblock write in the call to tls_setup_write_buffer() - the different
* buffer sizes will be spotted and the buffer reallocated.
*/
packlen = EVP_CIPHER_CTX_ctrl(rl->enc_ctx,
EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE,
(int)templates[0].buflen, NULL);
packlen *= numtempl;
if (!tls_setup_write_buffer(rl, 1, packlen, packlen)) {
/* RLAYERfatal() already called */
return -1;
}
wb = &rl->wbuf[0];
mb_param.interleave = (unsigned int)numtempl;
memcpy(aad, rl->sequence, 8);
aad[8] = templates[0].type;
aad[9] = (unsigned char)(templates[0].version >> 8);
aad[10] = (unsigned char)(templates[0].version);
aad[11] = 0;
aad[12] = 0;
mb_param.out = NULL;
mb_param.inp = aad;
mb_param.len = totlen;
packleni = EVP_CIPHER_CTX_ctrl(rl->enc_ctx,
EVP_CTRL_TLS1_1_MULTIBLOCK_AAD,
sizeof(mb_param), &mb_param);
packlen = (size_t)packleni;
if (packleni <= 0 || packlen > wb->len) { /* never happens */
RLAYERfatal(rl, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return -1;
}
mb_param.out = wb->buf;
mb_param.inp = templates[0].buf;
mb_param.len = totlen;
if (EVP_CIPHER_CTX_ctrl(rl->enc_ctx,
EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT,
sizeof(mb_param), &mb_param) <= 0) {
RLAYERfatal(rl, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return -1;
}
rl->sequence[7] += mb_param.interleave;
if (rl->sequence[7] < mb_param.interleave) {
int j = 6;
while (j >= 0 && (++rl->sequence[j--]) == 0) ;
}
wb->offset = 0;
wb->left = packlen;
return 1;
#else /* !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK */
return 0;
#endif
}
int tls_write_records_multiblock(OSSL_RECORD_LAYER *rl,
OSSL_RECORD_TEMPLATE *templates,
size_t numtempl)
{
int ret;
ret = tls_write_records_multiblock_int(rl, templates, numtempl);
if (ret < 0) {
/* RLAYERfatal already called */
return 0;
}
if (ret == 0) {
/* Multiblock wasn't suitable so just do a standard write */
if (!tls_write_records_default(rl, templates, numtempl)) {
/* RLAYERfatal already called */
return 0;
}
}
return 1;
}
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