diff --git a/lib/libes/include/es/SignatureBlock.h b/lib/libes/include/es/SignatureBlock.h
new file mode 100644
index 0000000..86ab6c8
--- /dev/null
+++ b/lib/libes/include/es/SignatureBlock.h
@@ -0,0 +1,53 @@
+#pragma once
+#include <string>
+#include <fnd/MemoryBlob.h>
+#include <fnd/ISerialiseableBinary.h>
+#include <es/sign.h>
+
+namespace es
+{
+	class SignatureBlock
+		: public fnd::ISerialiseableBinary
+	{
+	public:
+		SignatureBlock();
+		SignatureBlock(const SignatureBlock& other);
+
+		void operator=(const SignatureBlock& other);
+		bool operator==(const SignatureBlock& other) const;
+		bool operator!=(const SignatureBlock& other) const;
+
+		void importBinary(byte_t* src, size_t size);
+		void exportBinary();
+
+		const byte_t* getBytes() const;
+		size_t getSize() const;
+
+		void clear();
+
+		es::sign::SignType getSignType() const;
+		void setSignType(es::sign::SignType type);
+
+		bool isLittleEndian() const;
+		void setLittleEndian(bool isLE);
+
+		const fnd::MemoryBlob& getSignature() const;
+		void setSignature(const fnd::MemoryBlob& signature);
+	
+		
+	private:
+		const std::string kModuleName = "SIGNATURE_BLOCK";
+
+		// raw binary
+		fnd::MemoryBlob mBinaryBlob;
+
+		// variables
+		es::sign::SignType mSignType;
+		bool mIsLittleEndian;
+		fnd::MemoryBlob mSignature;
+
+		// helpers
+		bool isEqual(const SignatureBlock& other) const;
+		void copyFrom(const SignatureBlock& other);
+	};
+}
\ No newline at end of file
diff --git a/lib/libes/source/SignatureBlock.cpp b/lib/libes/source/SignatureBlock.cpp
new file mode 100644
index 0000000..d8d6fba
--- /dev/null
+++ b/lib/libes/source/SignatureBlock.cpp
@@ -0,0 +1,197 @@
+#include <es/SignatureBlock.h>
+
+es::SignatureBlock::SignatureBlock()
+{
+	clear();
+}
+
+es::SignatureBlock::SignatureBlock(const SignatureBlock& other)
+{
+	copyFrom(other);
+}
+
+void es::SignatureBlock::operator=(const SignatureBlock& other)
+{
+	copyFrom(other);
+}
+
+bool es::SignatureBlock::operator==(const SignatureBlock& other) const
+{
+	return isEqual(other);
+}
+
+bool es::SignatureBlock::operator!=(const SignatureBlock& other) const
+{
+	return !(*this == other);
+}
+
+void es::SignatureBlock::importBinary(byte_t* src, size_t size)
+{
+	clear();
+
+	size_t totalSize = 0;
+	size_t sigSize = 0;
+	uint32_t signType = 0;
+
+	// try Big Endian sign type
+	signType = ((be_uint32_t*)src)->get();
+	switch (signType)
+	{
+	case (sign::SIGN_RSA4096_SHA1): 
+	case (sign::SIGN_RSA4096_SHA256):
+		totalSize = sizeof(sRsa4096SignBlock);
+		sigSize = crypto::rsa::kRsa4096Size;
+		break;
+	case (sign::SIGN_RSA2048_SHA1): 
+	case (sign::SIGN_RSA2048_SHA256):
+		totalSize = sizeof(sRsa2048SignBlock);
+		sigSize = crypto::rsa::kRsa2048Size;
+		break;
+	case (sign::SIGN_ECDSA240_SHA1): 
+	case (sign::SIGN_ECDSA240_SHA256):
+		totalSize = sizeof(sEcdsa240SignBlock);
+		sigSize = sign::kEcdsaSigSize;
+		break;
+	}
+
+	// try Big Endian sign type
+	if (totalSize == 0)
+	{
+		signType = ((le_uint32_t*)src)->get();
+		switch (signType)
+		{
+		case (sign::SIGN_RSA4096_SHA1): 
+		case (sign::SIGN_RSA4096_SHA256):
+			totalSize = sizeof(sRsa4096SignBlock);
+			sigSize = crypto::rsa::kRsa4096Size;
+			break;
+		case (sign::SIGN_RSA2048_SHA1): 
+		case (sign::SIGN_RSA2048_SHA256):
+			totalSize = sizeof(sRsa2048SignBlock);
+			sigSize = crypto::rsa::kRsa2048Size;
+			break;
+		case (sign::SIGN_ECDSA240_SHA1): 
+		case (sign::SIGN_ECDSA240_SHA256):
+			totalSize = sizeof(sEcdsa240SignBlock);
+			sigSize = sign::kEcdsaSigSize;
+			break;
+		default:
+			throw fnd::Exception(kModuleName, "Unknown signature type");
+		}
+
+		mIsLittleEndian = true;
+	}
+
+	if (totalSize > size)
+	{
+		throw fnd::Exception(kModuleName, "Certificate too small");
+	}
+
+	mBinaryBlob.alloc(totalSize);
+	memcpy(mBinaryBlob.getBytes(), src, totalSize);
+
+	mSignType = (sign::SignType)signType;
+	mSignature.alloc(sigSize);
+	memcpy(mSignature.getBytes(), mBinaryBlob.getBytes() + 4, sigSize);
+}
+
+void es::SignatureBlock::exportBinary()
+{
+	size_t totalSize = 0;
+	size_t sigSize = 0;
+
+	switch (mSignType)
+	{
+	case (sign::SIGN_RSA4096_SHA1): 
+	case (sign::SIGN_RSA4096_SHA256):
+		totalSize = sizeof(sRsa4096SignBlock);
+		sigSize = crypto::rsa::kRsa4096Size;
+		break;
+	case (sign::SIGN_RSA2048_SHA1): 
+	case (sign::SIGN_RSA2048_SHA256):
+		totalSize = sizeof(sRsa2048SignBlock);
+		sigSize = crypto::rsa::kRsa2048Size;
+		break;
+	case (sign::SIGN_ECDSA240_SHA1): 
+	case (sign::SIGN_ECDSA240_SHA256):
+		totalSize = sizeof(sEcdsa240SignBlock);
+		sigSize = sign::kEcdsaSigSize;
+		break;
+	default:
+		throw fnd::Exception(kModuleName, "Unknown signature type");
+	}
+
+	if (mSignature.getSize() != sigSize)
+		throw fnd::Exception(kModuleName, "Signature size is incorrect");
+	
+	// commit to binary
+	mBinaryBlob.alloc(totalSize);
+	if (mIsLittleEndian)
+		*(le_uint32_t*)(mBinaryBlob.getBytes()) = mSignType;
+	else
+		*(be_uint32_t*)(mBinaryBlob.getBytes()) = mSignType;
+	memcpy(mBinaryBlob.getBytes() + 4, mSignature.getBytes(), sigSize);
+}
+
+const byte_t* es::SignatureBlock::getBytes() const
+{
+	return mBinaryBlob.getBytes();
+}
+
+size_t es::SignatureBlock::getSize() const
+{
+	return mBinaryBlob.getSize();
+}
+
+void es::SignatureBlock::clear()
+{
+	mBinaryBlob.clear();
+	mSignType = sign::SIGN_RSA4096_SHA1;
+	mIsLittleEndian = false;
+	mSignature.clear();
+}
+
+es::sign::SignType es::SignatureBlock::getSignType() const
+{
+	return mSignType;
+}
+
+void es::SignatureBlock::setSignType(es::sign::SignType type)
+{
+	mSignType = type;
+}
+
+bool es::SignatureBlock::isLittleEndian() const
+{
+	return mIsLittleEndian;
+}
+
+void es::SignatureBlock::setLittleEndian(bool isLE)
+{
+	mIsLittleEndian = isLE;
+}
+
+const fnd::MemoryBlob& es::SignatureBlock::getSignature() const
+{
+	return mSignature;
+}
+
+void es::SignatureBlock::setSignature(const fnd::MemoryBlob& signature)
+{
+	mSignature = signature;
+}
+
+bool es::SignatureBlock::isEqual(const SignatureBlock& other) const
+{
+	return (mSignType == other.mSignType) \
+		&& (mIsLittleEndian == other.mIsLittleEndian) \
+		&& (mSignature == other.mSignature);
+}
+
+void es::SignatureBlock::copyFrom(const SignatureBlock& other)
+{
+	mBinaryBlob = other.mBinaryBlob;
+	mSignType = other.mSignType;
+	mIsLittleEndian = other.mIsLittleEndian;
+	mSignature = other.mSignature;
+}