+ ivlen = EVP_CCM_TLS_IV_LEN;
+ if (s->s3->tmp.new_cipher == NULL) {
+ /* We've not selected a cipher yet - we must be doing early data */
+ algenc = s->session->cipher->algorithm_enc;
+ } else {
+ algenc = s->s3->tmp.new_cipher->algorithm_enc;
+ }
+ if (algenc & (SSL_AES128CCM8 | SSL_AES256CCM8))
+ taglen = EVP_CCM8_TLS_TAG_LEN;
+ else
+ taglen = EVP_CCM_TLS_TAG_LEN;
+ } else {
+ ivlen = EVP_CIPHER_iv_length(ciph);
+ taglen = 0;
+ }
+
+ if (!tls13_derive_key(s, md, secret, key, keylen)
+ || !tls13_derive_iv(s, md, secret, iv, ivlen)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ if (EVP_CipherInit_ex(ciph_ctx, ciph, NULL, NULL, NULL, sending) <= 0
+ || !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL)
+ || (taglen != 0 && !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_TAG,
+ taglen, NULL))
+ || EVP_CipherInit_ex(ciph_ctx, NULL, NULL, key, NULL, -1) <= 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DERIVE_SECRET_KEY_AND_IV,
+ ERR_R_EVP_LIB);
+ goto err;
+ }
+
+ return 1;
+ err:
+ OPENSSL_cleanse(key, sizeof(key));
+ return 0;
+}
+
+int tls13_change_cipher_state(SSL *s, int which)
+{
+ static const unsigned char client_early_traffic[] = "c e traffic";
+ static const unsigned char client_handshake_traffic[] = "c hs traffic";
+ static const unsigned char client_application_traffic[] = "c ap traffic";
+ static const unsigned char server_handshake_traffic[] = "s hs traffic";
+ static const unsigned char server_application_traffic[] = "s ap traffic";
+ static const unsigned char exporter_master_secret[] = "exp master";
+ static const unsigned char resumption_master_secret[] = "res master";
+ unsigned char *iv;
+ unsigned char secret[EVP_MAX_MD_SIZE];
+ unsigned char hashval[EVP_MAX_MD_SIZE];
+ unsigned char *hash = hashval;
+ unsigned char *insecret;
+ unsigned char *finsecret = NULL;
+ const char *log_label = NULL;
+ EVP_CIPHER_CTX *ciph_ctx;
+ size_t finsecretlen = 0;
+ const unsigned char *label;
+ size_t labellen, hashlen = 0;
+ int ret = 0;
+ const EVP_MD *md = NULL;
+ const EVP_CIPHER *cipher = NULL;
+
+ if (which & SSL3_CC_READ) {
+ if (s->enc_read_ctx != NULL) {
+ EVP_CIPHER_CTX_reset(s->enc_read_ctx);
+ } else {
+ s->enc_read_ctx = EVP_CIPHER_CTX_new();
+ if (s->enc_read_ctx == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ }
+ ciph_ctx = s->enc_read_ctx;
+ iv = s->read_iv;
+
+ RECORD_LAYER_reset_read_sequence(&s->rlayer);
+ } else {
+ if (s->enc_write_ctx != NULL) {
+ EVP_CIPHER_CTX_reset(s->enc_write_ctx);
+ } else {
+ s->enc_write_ctx = EVP_CIPHER_CTX_new();
+ if (s->enc_write_ctx == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ }
+ ciph_ctx = s->enc_write_ctx;
+ iv = s->write_iv;
+
+ RECORD_LAYER_reset_write_sequence(&s->rlayer);
+ }
+
+ if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
+ || ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) {
+ if (which & SSL3_CC_EARLY) {
+ EVP_MD_CTX *mdctx = NULL;
+ long handlen;
+ void *hdata;
+ unsigned int hashlenui;
+ const SSL_CIPHER *sslcipher = SSL_SESSION_get0_cipher(s->session);
+
+ insecret = s->early_secret;
+ label = client_early_traffic;
+ labellen = sizeof(client_early_traffic) - 1;
+ log_label = CLIENT_EARLY_LABEL;
+
+ handlen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
+ if (handlen <= 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS13_CHANGE_CIPHER_STATE,
+ SSL_R_BAD_HANDSHAKE_LENGTH);
+ goto err;
+ }
+
+ if (s->early_data_state == SSL_EARLY_DATA_CONNECTING
+ && s->max_early_data > 0
+ && s->session->ext.max_early_data == 0) {
+ /*
+ * If we are attempting to send early data, and we've decided to
+ * actually do it but max_early_data in s->session is 0 then we
+ * must be using an external PSK.
+ */
+ if (!ossl_assert(s->psksession != NULL
+ && s->max_early_data ==
+ s->psksession->ext.max_early_data)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS13_CHANGE_CIPHER_STATE,
+ ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ sslcipher = SSL_SESSION_get0_cipher(s->psksession);
+ }
+ if (sslcipher == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS13_CHANGE_CIPHER_STATE, SSL_R_BAD_PSK);
+ goto err;
+ }
+
+ /*
+ * We need to calculate the handshake digest using the digest from
+ * the session. We haven't yet selected our ciphersuite so we can't
+ * use ssl_handshake_md().
+ */
+ mdctx = EVP_MD_CTX_new();
+ if (mdctx == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ cipher = EVP_get_cipherbynid(SSL_CIPHER_get_cipher_nid(sslcipher));
+ md = ssl_md(sslcipher->algorithm2);
+ if (md == NULL || !EVP_DigestInit_ex(mdctx, md, NULL)
+ || !EVP_DigestUpdate(mdctx, hdata, handlen)
+ || !EVP_DigestFinal_ex(mdctx, hashval, &hashlenui)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
+ EVP_MD_CTX_free(mdctx);
+ goto err;
+ }
+ hashlen = hashlenui;
+ EVP_MD_CTX_free(mdctx);
+ } else if (which & SSL3_CC_HANDSHAKE) {
+ insecret = s->handshake_secret;
+ finsecret = s->client_finished_secret;
+ finsecretlen = EVP_MD_size(ssl_handshake_md(s));
+ label = client_handshake_traffic;
+ labellen = sizeof(client_handshake_traffic) - 1;
+ log_label = CLIENT_HANDSHAKE_LABEL;
+ /*
+ * The handshake hash used for the server read/client write handshake
+ * traffic secret is the same as the hash for the server
+ * write/client read handshake traffic secret. However, if we
+ * processed early data then we delay changing the server
+ * read/client write cipher state until later, and the handshake
+ * hashes have moved on. Therefore we use the value saved earlier
+ * when we did the server write/client read change cipher state.
+ */
+ hash = s->handshake_traffic_hash;
+ } else {
+ insecret = s->master_secret;
+ label = client_application_traffic;
+ labellen = sizeof(client_application_traffic) - 1;
+ log_label = CLIENT_APPLICATION_LABEL;
+ /*
+ * For this we only use the handshake hashes up until the server
+ * Finished hash. We do not include the client's Finished, which is
+ * what ssl_handshake_hash() would give us. Instead we use the
+ * previously saved value.
+ */
+ hash = s->server_finished_hash;
+ }
+ } else {
+ /* Early data never applies to client-read/server-write */
+ if (which & SSL3_CC_HANDSHAKE) {
+ insecret = s->handshake_secret;
+ finsecret = s->server_finished_secret;
+ finsecretlen = EVP_MD_size(ssl_handshake_md(s));
+ label = server_handshake_traffic;
+ labellen = sizeof(server_handshake_traffic) - 1;
+ log_label = SERVER_HANDSHAKE_LABEL;
+ } else {
+ insecret = s->master_secret;
+ label = server_application_traffic;
+ labellen = sizeof(server_application_traffic) - 1;
+ log_label = SERVER_APPLICATION_LABEL;
+ }
+ }
+
+ if (!(which & SSL3_CC_EARLY)) {
+ md = ssl_handshake_md(s);
+ cipher = s->s3->tmp.new_sym_enc;
+ if (!ssl3_digest_cached_records(s, 1)
+ || !ssl_handshake_hash(s, hashval, sizeof(hashval), &hashlen)) {
+ /* SSLfatal() already called */;
+ goto err;
+ }
+ }
+
+ /*
+ * Save the hash of handshakes up to now for use when we calculate the
+ * client application traffic secret
+ */
+ if (label == server_application_traffic)
+ memcpy(s->server_finished_hash, hashval, hashlen);
+
+ if (label == server_handshake_traffic)
+ memcpy(s->handshake_traffic_hash, hashval, hashlen);
+
+ if (label == client_application_traffic) {
+ /*
+ * We also create the resumption master secret, but this time use the
+ * hash for the whole handshake including the Client Finished
+ */
+ if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
+ resumption_master_secret,
+ sizeof(resumption_master_secret) - 1,
+ hashval, hashlen, s->session->master_key,
+ hashlen)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ s->session->master_key_length = hashlen;
+
+ /* Now we create the exporter master secret */
+ if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
+ exporter_master_secret,
+ sizeof(exporter_master_secret) - 1,
+ hash, hashlen, s->exporter_master_secret,
+ hashlen)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ }
+
+ if (!derive_secret_key_and_iv(s, which & SSL3_CC_WRITE, md, cipher,
+ insecret, hash, label, labellen, secret, iv,
+ ciph_ctx)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ if (label == server_application_traffic)
+ memcpy(s->server_app_traffic_secret, secret, hashlen);
+ else if (label == client_application_traffic)
+ memcpy(s->client_app_traffic_secret, secret, hashlen);
+
+ if (!ssl_log_secret(s, log_label, secret, hashlen)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ if (finsecret != NULL
+ && !tls13_derive_finishedkey(s, ssl_handshake_md(s), secret,
+ finsecret, finsecretlen)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ ret = 1;
+ err:
+ OPENSSL_cleanse(secret, sizeof(secret));
+ return ret;
+}
+
+int tls13_update_key(SSL *s, int sending)
+{
+ static const unsigned char application_traffic[] = "traffic upd";
+ const EVP_MD *md = ssl_handshake_md(s);
+ size_t hashlen = EVP_MD_size(md);
+ unsigned char *insecret, *iv;
+ unsigned char secret[EVP_MAX_MD_SIZE];
+ EVP_CIPHER_CTX *ciph_ctx;
+ int ret = 0;
+
+ if (s->server == sending)
+ insecret = s->server_app_traffic_secret;
+ else
+ insecret = s->client_app_traffic_secret;
+
+ if (sending) {
+ iv = s->write_iv;
+ ciph_ctx = s->enc_write_ctx;
+ RECORD_LAYER_reset_write_sequence(&s->rlayer);
+ } else {
+ iv = s->read_iv;
+ ciph_ctx = s->enc_read_ctx;
+ RECORD_LAYER_reset_read_sequence(&s->rlayer);
+ }
+
+ if (!derive_secret_key_and_iv(s, sending, ssl_handshake_md(s),
+ s->s3->tmp.new_sym_enc, insecret, NULL,
+ application_traffic,
+ sizeof(application_traffic) - 1, secret, iv,
+ ciph_ctx)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ memcpy(insecret, secret, hashlen);
+
+ ret = 1;
+ err:
+ OPENSSL_cleanse(secret, sizeof(secret));
+ return ret;
+}
+
+int tls13_alert_code(int code)
+{
+ if (code == SSL_AD_MISSING_EXTENSION)
+ return code;
+
+ return tls1_alert_code(code);
+}
+
+int tls13_export_keying_material(SSL *s, unsigned char *out, size_t olen,
+ const char *label, size_t llen,
+ const unsigned char *context,
+ size_t contextlen, int use_context)
+{
+ unsigned char exportsecret[EVP_MAX_MD_SIZE];
+ static const unsigned char exporterlabel[] = "exporter";
+ unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
+ const EVP_MD *md = ssl_handshake_md(s);
+ EVP_MD_CTX *ctx = EVP_MD_CTX_new();
+ unsigned int hashsize, datalen;
+ int ret = 0;
+
+ if (ctx == NULL || !SSL_is_init_finished(s))
+ goto err;
+
+ if (!use_context)
+ contextlen = 0;
+
+ if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
+ || EVP_DigestUpdate(ctx, context, contextlen) <= 0
+ || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
+ || EVP_DigestInit_ex(ctx, md, NULL) <= 0
+ || EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
+ || !tls13_hkdf_expand(s, md, s->exporter_master_secret,
+ (const unsigned char *)label, llen,
+ data, datalen, exportsecret, hashsize)
+ || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
+ sizeof(exporterlabel) - 1, hash, hashsize,
+ out, olen))
+ goto err;
+
+ ret = 1;
+ err:
+ EVP_MD_CTX_free(ctx);
+ return ret;
+}