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];
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, s->exporter_master_secret, hashlen)) {
+ SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
}
if (!derive_secret_key_and_iv(s, which & SSL3_CC_WRITE, md, cipher,
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];
+ const EVP_MD *md = ssl_handshake_md(s);
+ EVP_MD_CTX *ctx = EVP_MD_CTX_new();
+ unsigned int hashsize;
+ 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
+ || !tls13_hkdf_expand(s, md, s->exporter_master_secret,
+ (const unsigned char *)label, llen, NULL,
+ exportsecret, 0)
+ || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
+ sizeof(exporterlabel) - 1, hash, out, olen))
+ goto err;
+
+ ret = 1;
+ err:
+ EVP_MD_CTX_free(ctx);
+ return ret;
+}