1 files changed, 27 insertions, 0 deletions
diff --git a/plugins/CryptoPP/crypto/adler32.h b/plugins/CryptoPP/crypto/adler32.h
new file mode 100644
index 0000000000..672b3edd18
--- /dev/null
+++ b/plugins/CryptoPP/crypto/adler32.h
@@ -0,0 +1,27 @@
+#ifndef CRYPTOPP_ADLER32_H
+#define CRYPTOPP_ADLER32_H
+
+#include "cryptlib.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+//! ADLER-32 checksum calculations 
+class Adler32 : public HashTransformation
+{
+public:
+	CRYPTOPP_CONSTANT(DIGESTSIZE = 4)
+	Adler32() {Reset();}
+	void Update(const byte *input, size_t length);
+	void TruncatedFinal(byte *hash, size_t size);
+	unsigned int DigestSize() const {return DIGESTSIZE;}
+    std::string AlgorithmName() const {return "Adler32";}
+
+private:
+	void Reset() {m_s1 = 1; m_s2 = 0;}
+
+	word16 m_s1, m_s2;
+};
+
+NAMESPACE_END
+
+#endif