The client sends his first message.

Changed some of the boilerplate so it's more conveniant to add types.

2 files changed, 26 insertions, 3 deletions

diff --git a/libcmix/cmix.c b/libcmix/cmix.c
index 582fe70..a47a9fa 100644
--- a/libcmix/cmix.c
+++ b/libcmix/cmix.c
@@ -216,6 +216,8 @@ enum cmix_error key_exchange_init(struct CMixContext const* ctx, char* pubkey_bu
 	
 	get_public_key(ctx, pubkey_buffer);
 	element_to_buffer(ctx, value_buffer, value);
+	
+	ctx->api.free_group_element(value);
 	return no_error;
 }
 
@@ -235,10 +237,13 @@ enum cmix_error key_exchange_responder(struct CMixContext const* ctx, GroupEleme
 	return no_error;
 }
 
-enum cmix_error key_exchange_initiator(struct CMixContext const* ctx, GroupElement* shared_key, char const* pubkey, char const* value, GroupElement priv_el) {
+enum cmix_error key_exchange_initiator(struct CMixContext const* ctx, GroupElement* shared_key, char const* pubkey, char const* value, GroupElement* priv_el) {
 	size_t el_len = get_group_element_array_size(ctx);
 	*shared_key = ctx->api.derive_shared_key(ctx->keypair, (unsigned char*)pubkey, el_len, (unsigned char*)value, el_len, priv_el, false);
 	
+	ctx->api.free_group_element(*priv_el);
+	*priv_el = NULL;
+	
 	return no_error;
 }
 
@@ -251,7 +256,7 @@ enum cmix_error post_process(struct CMixContext* ctx, char* r_out, char* m_out,
 	GroupElement pirs = ctx->api.multiply(D, msg, true);
 	element_to_buffer(ctx, m_out, pirs);
 	
-	ctx->pirs = pirs; // this is not always usable as only the last node will be able to use this effectively, but we store it anyways.
+	ctx->pirs[index] = pirs; // this is not always usable as only the last node will be able to use this effectively, but we store it anyways.
 	
 	ctx->api.free_group_element(x);
 	ctx->api.free_group_element(D);
@@ -259,3 +264,19 @@ enum cmix_error post_process(struct CMixContext* ctx, char* r_out, char* m_out,
 	
 	return no_error;
 }
+
+enum cmix_error blind_message(struct CMixContext const* ctx, char* m_out, char const* message, GroupElement const* keys, size_t const nr_nodes) {
+	size_t len = get_group_element_array_size(ctx);
+	
+	GroupElement mes = ctx->api.array_to_element(message, len, true);
+	
+	for(size_t i = 0; i < nr_nodes; ++i) {
+		ctx->api.multiply(mes, mes, keys[i]);
+	}
+	
+	element_to_buffer(ctx, m_out, mes);
+	
+	ctx->api.free_group_element(mes);
+	
+	return no_error;
+}
diff --git a/libcmix/cmix.h b/libcmix/cmix.h
index 7442369..33b99d2 100644
--- a/libcmix/cmix.h
+++ b/libcmix/cmix.h
@@ -113,10 +113,12 @@ enum cmix_error key_exchange_init(struct CMixContext const* ctx, char* pubkey_bu
 
 enum cmix_error key_exchange_responder(struct CMixContext const* ctx, GroupElement* shared_key, char* public_key_buffer, char* exhange_value_buffer, char const* pubkey, char const* value);
 
-enum cmix_error key_exchange_initiator(struct CMixContext const* ctx, GroupElement* shared_key, char const* pubkey, char const* value, GroupElement priv_el);
+enum cmix_error key_exchange_initiator(struct CMixContext const* ctx, GroupElement* shared_key, char const* pubkey, char const* value, GroupElement* priv_el);
 
 enum cmix_error post_process(struct CMixContext* ctx, char* r_out, char* m_out, char const* r_epirs, char const* m_epirs, size_t index);
 
+enum cmix_error blind_message(struct CMixContext const* ctx, char* m_out, char const* message, GroupElement const* keys, size_t const nr_nodes);
+
 #ifdef __cplusplus
 } // extern "C"
 #endif