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diff --git a/src/pk_pad/emsa1_bsi/emsa1_bsi.h b/src/pk_pad/emsa1_bsi/emsa1_bsi.h
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+/*************************************************
+* EMSA1 BSI Variant Header File *
+* (C) 1999-2008 Jack Lloyd *
+* 2007 FlexSecure GmbH *
+*************************************************/
+
+#ifndef BOTAN_EMSA1_BSI_H__
+#define BOTAN_EMSA1_BSI_H__
+
+#include <botan/emsa1.h>
+
+namespace Botan {
+
+/**
+EMSA1_BSI is a variant of EMSA1 specified by the BSI. It accepts only
+hash values which are less or equal than the maximum key length. The
+implementation comes from InSiTo
+*/
+class BOTAN_DLL EMSA1_BSI : public EMSA1
+ {
+ public:
+ EMSA1_BSI(HashFunction* hash) : EMSA1(hash) {}
+ private:
+ SecureVector<byte> encoding_of(const MemoryRegion<byte>&, u32bit,
+ RandomNumberGenerator& rng);
+ };
+
+}
+
+#endif