Also added an SHA256 abstract class to core, with swappable implementation support.

core/SCsub

@@ -7,6 +7,7 @@ env.core_sources = []
 env.add_source_files(env.core_sources, "*.cpp")
 env.add_source_files(env.core_sources, "./html/*.cpp")
 env.add_source_files(env.core_sources, "./http/*.cpp")
+env.add_source_files(env.core_sources, "./hash/*.cpp")
 env.add_source_files(env.core_sources, "./bry_http/*.cpp")
 env.add_source_files(env.core_sources, "./database/*.cpp")
 

core/hash/sha256.cpp

@@ -0,0 +1,20 @@
+#include "sha256.h"
+
+SHA256::SHA256() {
+
+}
+
+SHA256::~SHA256() {
+
+}
+
+SHA256 *SHA256::get() {
+	if (_sha_256_creation_func == nullptr) {
+		printf("Error: static SHA256 *get(): creation_func == nullptr\n");
+		return nullptr;
+	}
+
+	return _sha_256_creation_func();
+}
+
+SHA256 *(*SHA256::_sha_256_creation_func)(void) = nullptr;

core/hash/sha256.h

@@ -0,0 +1,26 @@
+#ifndef SHA256_H
+#define SHA256_H
+
+#include <string>
+
+class SHA256 {
+public:
+	virtual std::string compute(const void *data, size_t num_bytes) = 0;
+	virtual std::string compute(const std::string &text) = 0;
+
+	virtual void add(const void *data, size_t num_bytes) = 0;
+	virtual std::string get_hash() = 0;
+	virtual void get_hash(unsigned char *buffer, size_t buffer_len) = 0;
+
+	virtual void reset() = 0;
+
+	static SHA256 *get();
+
+	SHA256();
+	virtual ~SHA256();
+
+protected:
+	static SHA256 *(*_sha_256_creation_func)(void);
+};
+
+#endif