diff --git a/lib/libcrypto/include/crypto/ecdsa.h b/lib/libcrypto/include/crypto/ecdsa.h
new file mode 100644
index 0000000..fdf1ff6
--- /dev/null
+++ b/lib/libcrypto/include/crypto/ecdsa.h
@@ -0,0 +1,62 @@
+#pragma once
+#include <cstdint>
+#include <cstring>
+#include <crypto/sha.h>
+
+namespace crypto
+{
+	namespace ecdsa
+	{
+		const size_t kEcdsa240Size = 0x1E;
+
+		enum EcdsaType
+		{
+			ECDSA_240,
+		};
+
+#pragma pack (push, 1)
+		struct sEcdsa240Point
+		{
+			uint8_t r[kEcdsa240Size];
+			uint8_t s[kEcdsa240Size];
+
+			void operator=(const sEcdsa240Point& other)
+			{
+				memcpy(this->r, r, kEcdsa240Size);
+				memcpy(this->s, s, kEcdsa240Size);
+			}
+
+			bool operator==(const sEcdsa240Point& other) const
+			{
+				return memcmp(this->r, other.r, kEcdsa240Size) == 0 \
+					&& memcmp(this->s, other.s, kEcdsa240Size) == 0;
+			}
+
+			bool operator!=(const sEcdsa240Point& other) const
+			{
+				return !operator==(other);
+			}
+		};
+
+		struct sEcdsa240PrivateKey
+		{
+			uint8_t k[kEcdsa240Size];
+
+			void operator=(const sEcdsa240PrivateKey& other)
+			{
+				memcpy(this->k, k, kEcdsa240Size);
+			}
+
+			bool operator==(const sEcdsa240PrivateKey& other) const
+			{
+				return memcmp(this->k, other.k, kEcdsa240Size) == 0;
+			}
+
+			bool operator!=(const sEcdsa240PrivateKey& other) const
+			{
+				return !operator==(other);
+			}
+		};
+#pragma pack (pop)
+	}
+}