Common: Add SHA1Digest

src/common/sha1_digest.h

@@ -0,0 +1,25 @@
+#pragma once
+#include "types.h"
+#include <string>
+
+class SHA1Digest
+{
+public:
+  enum : u32
+  {
+    DIGEST_SIZE = 20
+  };
+
+  SHA1Digest();
+
+  void Update(const void* data, u32 len);
+  void Final(u8 digest[DIGEST_SIZE]);
+  void Reset();
+
+  static std::string DigestToString(const u8 digest[DIGEST_SIZE]);
+
+private:
+  u32 state[5];
+  u32 count[2];
+  u8 buffer[64];
+};