+++ /dev/null
-/*
- * Copyright 2016-2021 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 <assert.h>
-#include "../ssl_local.h"
-#include "record_local.h"
-#include "internal/cryptlib.h"
-
-/*-
- * tls13_enc encrypts/decrypts |n_recs| in |recs|. Calls SSLfatal on internal
- * error, but not otherwise. It is the responsibility of the caller to report
- * a bad_record_mac.
- *
- * Returns:
- * 0: On failure
- * 1: if the record encryption/decryption was successful.
- */
-int tls13_enc(SSL_CONNECTION *s, SSL3_RECORD *recs, size_t n_recs, int sending,
- ossl_unused SSL_MAC_BUF *mac, ossl_unused size_t macsize)
-{
- EVP_CIPHER_CTX *ctx;
- unsigned char iv[EVP_MAX_IV_LENGTH], recheader[SSL3_RT_HEADER_LENGTH];
- size_t taglen, offset, loop, hdrlen;
- int ivlen;
- unsigned char *staticiv;
- unsigned char *seq;
- int lenu, lenf;
- SSL3_RECORD *rec = &recs[0];
- uint32_t alg_enc;
- WPACKET wpkt;
-
- if (n_recs != 1) {
- /* Should not happen */
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
-
- assert(sending);
- ctx = s->enc_write_ctx;
- staticiv = s->write_iv;
- seq = RECORD_LAYER_get_write_sequence(&s->rlayer);
-
- /*
- * If we're sending an alert and ctx != NULL then we must be forcing
- * plaintext alerts. If we're reading and ctx != NULL then we allow
- * plaintext alerts at certain points in the handshake. If we've got this
- * far then we have already validated that a plaintext alert is ok here.
- */
- if (ctx == NULL || rec->type == SSL3_RT_ALERT) {
- memmove(rec->data, rec->input, rec->length);
- rec->input = rec->data;
- return 1;
- }
-
- ivlen = EVP_CIPHER_CTX_get_iv_length(ctx);
- if (ivlen < 0) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
-
- if (s->early_data_state == SSL_EARLY_DATA_WRITING
- || s->early_data_state == SSL_EARLY_DATA_WRITE_RETRY) {
- if (s->session != NULL && s->session->ext.max_early_data > 0) {
- alg_enc = s->session->cipher->algorithm_enc;
- } else {
- if (!ossl_assert(s->psksession != NULL
- && s->psksession->ext.max_early_data > 0)) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- alg_enc = s->psksession->cipher->algorithm_enc;
- }
- } else {
- /*
- * To get here we must have selected a ciphersuite - otherwise ctx would
- * be NULL
- */
- if (!ossl_assert(s->s3.tmp.new_cipher != NULL)) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- alg_enc = s->s3.tmp.new_cipher->algorithm_enc;
- }
-
- if (alg_enc & SSL_AESCCM) {
- if (alg_enc & (SSL_AES128CCM8 | SSL_AES256CCM8))
- taglen = EVP_CCM8_TLS_TAG_LEN;
- else
- taglen = EVP_CCM_TLS_TAG_LEN;
- if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, taglen, NULL) <= 0) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- } else if (alg_enc & SSL_AESGCM) {
- taglen = EVP_GCM_TLS_TAG_LEN;
- } else if (alg_enc & SSL_CHACHA20) {
- taglen = EVP_CHACHAPOLY_TLS_TAG_LEN;
- } else {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
-
- /* Set up IV */
- if (ivlen < SEQ_NUM_SIZE) {
- /* Should not happen */
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- offset = ivlen - SEQ_NUM_SIZE;
- memcpy(iv, staticiv, offset);
- for (loop = 0; loop < SEQ_NUM_SIZE; loop++)
- iv[offset + loop] = staticiv[offset + loop] ^ seq[loop];
-
- /* Increment the sequence counter */
- for (loop = SEQ_NUM_SIZE; loop > 0; loop--) {
- ++seq[loop - 1];
- if (seq[loop - 1] != 0)
- break;
- }
- if (loop == 0) {
- /* Sequence has wrapped */
- return 0;
- }
-
- if (EVP_CipherInit_ex(ctx, NULL, NULL, NULL, iv, sending) <= 0) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
-
- /* Set up the AAD */
- if (!WPACKET_init_static_len(&wpkt, recheader, sizeof(recheader), 0)
- || !WPACKET_put_bytes_u8(&wpkt, rec->type)
- || !WPACKET_put_bytes_u16(&wpkt, rec->rec_version)
- || !WPACKET_put_bytes_u16(&wpkt, rec->length + taglen)
- || !WPACKET_get_total_written(&wpkt, &hdrlen)
- || hdrlen != SSL3_RT_HEADER_LENGTH
- || !WPACKET_finish(&wpkt)) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- WPACKET_cleanup(&wpkt);
- return 0;
- }
-
- /*
- * For CCM we must explicitly set the total plaintext length before we add
- * any AAD.
- */
- if (((alg_enc & SSL_AESCCM) != 0
- && EVP_CipherUpdate(ctx, NULL, &lenu, NULL,
- (unsigned int)rec->length) <= 0)
- || EVP_CipherUpdate(ctx, NULL, &lenu, recheader,
- sizeof(recheader)) <= 0
- || EVP_CipherUpdate(ctx, rec->data, &lenu, rec->input,
- (unsigned int)rec->length) <= 0
- || EVP_CipherFinal_ex(ctx, rec->data + lenu, &lenf) <= 0
- || (size_t)(lenu + lenf) != rec->length) {
- return 0;
- }
-
- /* Add the tag */
- if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_GET_TAG, taglen,
- rec->data + rec->length) <= 0) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- rec->length += taglen;
-
- return 1;
-}
projects / openssl.git / blobdiff