Added support for client certificates (both client-side and server-side, but still...

[BearSSL] / src / ssl / ssl_ccert_single_ec.c

diff --git a/src/ssl/ssl_ccert_single_ec.c b/src/ssl/ssl_ccert_single_ec.c
new file mode 100644 (file)
index 0000000..1df19a9
--- /dev/null
+++ b/src/ssl/ssl_ccert_single_ec.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining 
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be 
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "inner.h"
+
+static void
+cc_none0(const br_ssl_client_certificate_class **pctx)
+{
+       (void)pctx;
+}
+
+static void
+cc_none1(const br_ssl_client_certificate_class **pctx, size_t len)
+{
+       (void)pctx;
+       (void)len;
+}
+
+static void
+cc_none2(const br_ssl_client_certificate_class **pctx,
+       const unsigned char *data, size_t len)
+{
+       (void)pctx;
+       (void)data;
+       (void)len;
+}
+
+static void
+cc_choose(const br_ssl_client_certificate_class **pctx,
+       const br_ssl_client_context *cc, uint32_t auth_types,
+       br_ssl_client_certificate *choices)
+{
+       br_ssl_client_certificate_ec_context *zc;
+       int x;
+       int scurve;
+
+       zc = (br_ssl_client_certificate_ec_context *)pctx;
+       scurve = br_ssl_client_get_server_curve(cc);
+
+       if ((zc->allowed_usages & BR_KEYTYPE_KEYX) != 0
+               && scurve == zc->sk->curve)
+       {
+               int x;
+
+               x = (zc->issuer_key_type == BR_KEYTYPE_RSA) ? 16 : 17;
+               if (((auth_types >> x) & 1) != 0) {
+                       choices->auth_type = BR_AUTH_ECDH;
+                       choices->hash_id = -1;
+                       choices->chain = zc->chain;
+                       choices->chain_len = zc->chain_len;
+               }
+       }
+
+       /*
+        * For ECDSA authentication, we must choose an appropriate
+        * hash function.
+        */
+       x = br_ssl_choose_hash((unsigned)(auth_types >> 8));
+       if (x == 0 || (zc->allowed_usages & BR_KEYTYPE_SIGN) == 0) {
+               memset(choices, 0, sizeof *choices);
+               return;
+       }
+       choices->auth_type = BR_AUTH_ECDSA;
+       choices->hash_id = x;
+       choices->chain = zc->chain;
+       choices->chain_len = zc->chain_len;
+}
+
+static uint32_t
+cc_do_keyx(const br_ssl_client_certificate_class **pctx,
+       unsigned char *data, size_t len)
+{
+       br_ssl_client_certificate_ec_context *zc;
+
+       zc = (br_ssl_client_certificate_ec_context *)pctx;
+       return zc->iec->mul(data, len, zc->sk->x, zc->sk->xlen, zc->sk->curve);
+}
+
+static size_t
+cc_do_sign(const br_ssl_client_certificate_class **pctx,
+       int hash_id, size_t hv_len, unsigned char *data, size_t len)
+{
+       br_ssl_client_certificate_ec_context *zc;
+       unsigned char hv[64];
+       const br_hash_class *hc;
+
+       zc = (br_ssl_client_certificate_ec_context *)pctx;
+       memcpy(hv, data, hv_len);
+       hc = br_multihash_getimpl(zc->mhash, hash_id);
+       if (hc == NULL) {
+               return 0;
+       }
+       if (len < 139) {
+               return 0;
+       }
+       return zc->iecdsa(zc->iec, hc, hv, zc->sk, data);
+}
+
+static const br_ssl_client_certificate_class ccert_vtable = {
+       sizeof(br_ssl_client_certificate_ec_context),
+       cc_none0, /* start_name_list */
+       cc_none1, /* start_name */
+       cc_none2, /* append_name */
+       cc_none0, /* end_name */
+       cc_none0, /* end_name_list */
+       cc_choose,
+       cc_do_keyx,
+       cc_do_sign
+};
+
+/* see bearssl_ssl.h */
+void
+br_ssl_client_set_single_ec(br_ssl_client_context *cc,
+       const br_x509_certificate *chain, size_t chain_len,
+       const br_ec_private_key *sk, unsigned allowed_usages,
+       unsigned cert_issuer_key_type,
+       const br_ec_impl *iec, br_ecdsa_sign iecdsa)
+{
+       cc->client_auth.single_ec.vtable = &ccert_vtable;
+       cc->client_auth.single_ec.chain = chain;
+       cc->client_auth.single_ec.chain_len = chain_len;
+       cc->client_auth.single_ec.sk = sk;
+       cc->client_auth.single_ec.allowed_usages = allowed_usages;
+       cc->client_auth.single_ec.issuer_key_type = cert_issuer_key_type;
+       cc->client_auth.single_ec.mhash = &cc->eng.mhash;
+       cc->client_auth.single_ec.iec = iec;
+       cc->client_auth.single_ec.iecdsa = iecdsa;
+       cc->client_auth_vtable = &cc->client_auth.single_ec.vtable;
+}