Add hashing context class

3 files changed, 205 insertions, 0 deletions

diff --git a/core/crypto/hashing_context.cpp b/core/crypto/hashing_context.cpp
new file mode 100644
index 0000000000..bdccb258dd
--- /dev/null
+++ b/core/crypto/hashing_context.cpp
@@ -0,0 +1,137 @@
+/*************************************************************************/
+/*  hashing_context.cpp                                                  */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* 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 "hashing_context.h"
+
+#include "core/crypto/crypto_core.h"
+
+Error HashingContext::start(HashType p_type) {
+	ERR_FAIL_COND_V(ctx != NULL, ERR_ALREADY_IN_USE);
+	_create_ctx(p_type);
+	ERR_FAIL_COND_V(ctx == NULL, ERR_UNAVAILABLE);
+	switch (type) {
+		case HASH_MD5:
+			return ((CryptoCore::MD5Context *)ctx)->start();
+		case HASH_SHA1:
+			return ((CryptoCore::SHA1Context *)ctx)->start();
+		case HASH_SHA256:
+			return ((CryptoCore::SHA256Context *)ctx)->start();
+	}
+	return ERR_UNAVAILABLE;
+}
+
+Error HashingContext::update(PoolByteArray p_chunk) {
+	ERR_FAIL_COND_V(ctx == NULL, ERR_UNCONFIGURED);
+	size_t len = p_chunk.size();
+	PoolByteArray::Read r = p_chunk.read();
+	switch (type) {
+		case HASH_MD5:
+			return ((CryptoCore::MD5Context *)ctx)->update(&r[0], len);
+		case HASH_SHA1:
+			return ((CryptoCore::SHA1Context *)ctx)->update(&r[0], len);
+		case HASH_SHA256:
+			return ((CryptoCore::SHA256Context *)ctx)->update(&r[0], len);
+	}
+	return ERR_UNAVAILABLE;
+}
+
+PoolByteArray HashingContext::finish() {
+	ERR_FAIL_COND_V(ctx == NULL, PoolByteArray());
+	PoolByteArray out;
+	Error err = FAILED;
+	switch (type) {
+		case HASH_MD5:
+			out.resize(16);
+			err = ((CryptoCore::MD5Context *)ctx)->finish(out.write().ptr());
+			break;
+		case HASH_SHA1:
+			out.resize(20);
+			err = ((CryptoCore::SHA1Context *)ctx)->finish(out.write().ptr());
+			break;
+		case HASH_SHA256:
+			out.resize(32);
+			err = ((CryptoCore::SHA256Context *)ctx)->finish(out.write().ptr());
+			break;
+	}
+	_delete_ctx();
+	ERR_FAIL_COND_V(err != OK, PoolByteArray());
+	return out;
+}
+
+void HashingContext::_create_ctx(HashType p_type) {
+	type = p_type;
+	switch (type) {
+		case HASH_MD5:
+			ctx = memnew(CryptoCore::MD5Context);
+			break;
+		case HASH_SHA1:
+			ctx = memnew(CryptoCore::SHA1Context);
+			break;
+		case HASH_SHA256:
+			ctx = memnew(CryptoCore::SHA256Context);
+			break;
+		default:
+			ctx = NULL;
+	}
+}
+
+void HashingContext::_delete_ctx() {
+	return;
+	switch (type) {
+		case HASH_MD5:
+			memdelete((CryptoCore::MD5Context *)ctx);
+			break;
+		case HASH_SHA1:
+			memdelete((CryptoCore::SHA1Context *)ctx);
+			break;
+		case HASH_SHA256:
+			memdelete((CryptoCore::SHA256Context *)ctx);
+			break;
+	}
+	ctx = NULL;
+}
+
+void HashingContext::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("start", "type"), &HashingContext::start);
+	ClassDB::bind_method(D_METHOD("update", "chunk"), &HashingContext::update);
+	ClassDB::bind_method(D_METHOD("finish"), &HashingContext::finish);
+	BIND_ENUM_CONSTANT(HASH_MD5);
+	BIND_ENUM_CONSTANT(HASH_SHA1);
+	BIND_ENUM_CONSTANT(HASH_SHA256);
+}
+
+HashingContext::HashingContext() {
+	ctx = NULL;
+}
+
+HashingContext::~HashingContext() {
+	if (ctx != NULL)
+		_delete_ctx();
+}
diff --git a/core/crypto/hashing_context.h b/core/crypto/hashing_context.h
new file mode 100644
index 0000000000..aa69636f2c
--- /dev/null
+++ b/core/crypto/hashing_context.h
@@ -0,0 +1,66 @@
+/*************************************************************************/
+/*  hashing_context.h                                                    */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* 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.                */
+/*************************************************************************/
+
+#ifndef HASHING_CONTEXT_H
+#define HASHING_CONTEXT_H
+
+#include "core/reference.h"
+
+class HashingContext : public Reference {
+	GDCLASS(HashingContext, Reference);
+
+public:
+	enum HashType {
+		HASH_MD5,
+		HASH_SHA1,
+		HASH_SHA256
+	};
+
+private:
+	void *ctx;
+	HashType type;
+
+protected:
+	static void _bind_methods();
+	void _create_ctx(HashType p_type);
+	void _delete_ctx();
+
+public:
+	Error start(HashType p_type);
+	Error update(PoolByteArray p_chunk);
+	PoolByteArray finish();
+
+	HashingContext();
+	~HashingContext();
+};
+
+VARIANT_ENUM_CAST(HashingContext::HashType);
+
+#endif // HASHING_CONTEXT_H
diff --git a/core/register_core_types.cpp b/core/register_core_types.cpp
index 6c05f3d54c..efc77bde48 100644
--- a/core/register_core_types.cpp
+++ b/core/register_core_types.cpp
@@ -35,6 +35,7 @@
 #include "core/compressed_translation.h"
 #include "core/core_string_names.h"
 #include "core/crypto/crypto.h"
+#include "core/crypto/hashing_context.h"
 #include "core/engine.h"
 #include "core/func_ref.h"
 #include "core/input_map.h"
@@ -156,6 +157,7 @@ void register_core_types() {
 	ClassDB::register_class<PacketPeerUDP>();
 
 	// Crypto
+	ClassDB::register_class<HashingContext>();
 	ClassDB::register_custom_instance_class<X509Certificate>();
 	ClassDB::register_custom_instance_class<CryptoKey>();
 	ClassDB::register_custom_instance_class<Crypto>();