Implement tls13_change_cipher_state()
Reviewed-by: Rich Salz <rsalz@openssl.org>
diff --git a/ssl/tls13_enc.c b/ssl/tls13_enc.c
index 39a61f4..04dba3b 100644
--- a/ssl/tls13_enc.c
+++ b/ssl/tls13_enc.c
@@ -214,4 +214,160 @@
return tls13_generate_secret(s, prev, NULL, 0, out);
}
+const unsigned char client_handshake_traffic[] =
+ "client handshake traffic secret";
+const unsigned char client_application_traffic[] =
+ "client application traffic secret";
+const unsigned char server_handshake_traffic[] =
+ "server handshake traffic secret";
+const unsigned char server_application_traffic[] =
+ "server application traffic secret";
+int tls13_change_cipher_state(SSL *s, int which)
+{
+ unsigned char key[EVP_MAX_KEY_LENGTH];
+ unsigned char iv[EVP_MAX_IV_LENGTH];
+ unsigned char secret[EVP_MAX_MD_SIZE];
+ unsigned char *insecret;
+ EVP_CIPHER_CTX *ciph_ctx;
+ const EVP_CIPHER *ciph = s->s3->tmp.new_sym_enc;;
+ size_t ivlen, keylen;
+ const unsigned char *label;
+ size_t labellen;
+
+ 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) {
+ SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ }
+ ciph_ctx = s->enc_read_ctx;
+
+ 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) {
+ SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ }
+ ciph_ctx = s->enc_write_ctx;
+
+ 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_HANDSHAKE) {
+ insecret = s->handshake_secret;
+ label = client_handshake_traffic;
+ labellen = sizeof(client_handshake_traffic) - 1;
+ } else {
+ insecret = s->session->master_key;
+ label = client_application_traffic;
+ labellen = sizeof(client_application_traffic) - 1;
+ }
+ } else {
+ if (which & SSL3_CC_HANDSHAKE) {
+ insecret = s->handshake_secret;
+ label = server_handshake_traffic;
+ labellen = sizeof(server_handshake_traffic) - 1;
+ } else {
+ insecret = s->session->master_key;
+ label = server_application_traffic;
+ labellen = sizeof(server_application_traffic) - 1;
+ }
+ }
+
+ if (!tls13_derive_secret(s, insecret, label, labellen, secret)) {
+ SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ /* TODO(size_t): convert me */
+ keylen = EVP_CIPHER_key_length(ciph);
+
+ if (EVP_CIPHER_mode(ciph) == EVP_CIPH_GCM_MODE)
+ ivlen = EVP_GCM_TLS_FIXED_IV_LEN;
+ else if (EVP_CIPHER_mode(ciph) == EVP_CIPH_CCM_MODE)
+ ivlen = EVP_CCM_TLS_FIXED_IV_LEN;
+ else
+ ivlen = EVP_CIPHER_iv_length(ciph);
+
+ if (!tls13_derive_key(s, secret, key, keylen)
+ || !tls13_derive_iv(s, secret, iv, ivlen)) {
+ SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ if (EVP_CIPHER_mode(ciph) == EVP_CIPH_GCM_MODE) {
+ if (!EVP_CipherInit_ex(ciph_ctx, ciph, NULL, key, NULL,
+ (which & SSL3_CC_WRITE))
+ || !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_GCM_SET_IV_FIXED,
+ (int)ivlen, iv)) {
+ SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_EVP_LIB);
+ goto err;
+ }
+ } else if (EVP_CIPHER_mode(ciph) == EVP_CIPH_CCM_MODE) {
+ int taglen;
+ if (s->s3->tmp.new_cipher->algorithm_enc
+ & (SSL_AES128CCM8 | SSL_AES256CCM8))
+ taglen = 8;
+ else
+ taglen = 16;
+ if (!EVP_CipherInit_ex(ciph_ctx, ciph, NULL, NULL, NULL,
+ (which & SSL3_CC_WRITE))
+ || !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_IVLEN, 12,
+ NULL)
+ || !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_TAG, taglen,
+ NULL)
+ || !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_CCM_SET_IV_FIXED,
+ (int)ivlen, iv)
+ || !EVP_CipherInit_ex(ciph_ctx, NULL, NULL, key, NULL, -1)) {
+ SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_EVP_LIB);
+ goto err;
+ }
+ } else {
+ if (!EVP_CipherInit_ex(ciph_ctx, ciph, NULL, key, iv,
+ (which & SSL3_CC_WRITE))) {
+ SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_EVP_LIB);
+ goto err;
+ }
+ }
+
+#ifdef OPENSSL_SSL_TRACE_CRYPTO
+ if (s->msg_callback) {
+ int wh = which & SSL3_CC_WRITE ? TLS1_RT_CRYPTO_WRITE : 0;
+
+ if (ciph->key_len)
+ s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,
+ key, ciph->key_len, s, s->msg_callback_arg);
+ if (ivlen) {
+ if (EVP_CIPHER_mode(ciph) == EVP_CIPH_GCM_MODE)
+ wh |= TLS1_RT_CRYPTO_FIXED_IV;
+ else
+ wh |= TLS1_RT_CRYPTO_IV;
+ s->msg_callback(2, s->version, wh, iv, ivlen, s,
+ s->msg_callback_arg);
+ }
+ }
+#endif
+
+ OPENSSL_cleanse(secret, sizeof(secret));
+ OPENSSL_cleanse(key, sizeof(key));
+ OPENSSL_cleanse(iv, sizeof(iv));
+ return 1;
+
+ err:
+ OPENSSL_cleanse(secret, sizeof(secret));
+ OPENSSL_cleanse(key, sizeof(key));
+ OPENSSL_cleanse(iv, sizeof(iv));
+ return 0;
+}
