20fc2051d2
Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/2550)
124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
/*
|
|
* Copyright 2016 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
|
|
*/
|
|
|
|
#include "../ssl_locl.h"
|
|
#include "record_locl.h"
|
|
|
|
/*-
|
|
* tls13_enc encrypts/decrypts |n_recs| in |recs|.
|
|
*
|
|
* Returns:
|
|
* 0: (in non-constant time) if the record is publically invalid (i.e. too
|
|
* short etc).
|
|
* 1: if the record encryption was successful.
|
|
* -1: if the record's AEAD-authenticator is invalid or, if sending,
|
|
* an internal error occurred.
|
|
*/
|
|
int tls13_enc(SSL *s, SSL3_RECORD *recs, size_t n_recs, int send)
|
|
{
|
|
EVP_CIPHER_CTX *ctx;
|
|
unsigned char iv[EVP_MAX_IV_LENGTH];
|
|
size_t ivlen, taglen, offset, loop;
|
|
unsigned char *staticiv;
|
|
unsigned char *seq;
|
|
int lenu, lenf;
|
|
SSL3_RECORD *rec = &recs[0];
|
|
uint32_t alg_enc = s->s3->tmp.new_cipher->algorithm_enc;
|
|
|
|
if (n_recs != 1) {
|
|
/* Should not happen */
|
|
/* TODO(TLS1.3): Support pipelining */
|
|
return -1;
|
|
}
|
|
|
|
if (send) {
|
|
ctx = s->enc_write_ctx;
|
|
staticiv = s->write_iv;
|
|
seq = RECORD_LAYER_get_write_sequence(&s->rlayer);
|
|
} else {
|
|
ctx = s->enc_read_ctx;
|
|
staticiv = s->read_iv;
|
|
seq = RECORD_LAYER_get_read_sequence(&s->rlayer);
|
|
}
|
|
|
|
if (ctx == NULL) {
|
|
memmove(rec->data, rec->input, rec->length);
|
|
rec->input = rec->data;
|
|
return 1;
|
|
}
|
|
ivlen = EVP_CIPHER_CTX_iv_length(ctx);
|
|
|
|
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 (send && EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, taglen,
|
|
NULL) <= 0)
|
|
return -1;
|
|
} 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 {
|
|
return -1;
|
|
}
|
|
|
|
if (!send) {
|
|
/*
|
|
* Take off tag. There must be at least one byte of content type as
|
|
* well as the tag
|
|
*/
|
|
if (rec->length < taglen + 1)
|
|
return 0;
|
|
rec->length -= taglen;
|
|
}
|
|
|
|
/* Set up IV */
|
|
if (ivlen < SEQ_NUM_SIZE) {
|
|
/* Should not happen */
|
|
return -1;
|
|
}
|
|
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 -1;
|
|
}
|
|
|
|
/* TODO(size_t): lenu/lenf should be a size_t but EVP doesn't support it */
|
|
if (EVP_CipherInit_ex(ctx, NULL, NULL, NULL, iv, send) <= 0
|
|
|| (!send && EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG,
|
|
taglen,
|
|
rec->data + rec->length) <= 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 -1;
|
|
}
|
|
if (send) {
|
|
/* Add the tag */
|
|
if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_GET_TAG, taglen,
|
|
rec->data + rec->length) <= 0)
|
|
return -1;
|
|
rec->length += taglen;
|
|
}
|
|
|
|
return 1;
|
|
}
|