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diff --git a/src/include/dkimsign.h b/src/include/dkimsign.h
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+++ b/src/include/dkimsign.h
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+/*****************************************************************************
+*  Copyright 2005 Alt-N Technologies, Ltd.
+*
+*  Licensed under the Apache License, Version 2.0 (the "License");
+*  you may not use this file except in compliance with the License.
+*  You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+*  This code incorporates intellectual property owned by Yahoo! and licensed
+*  pursuant to the Yahoo! DomainKeys Patent License Agreement.
+*
+*  Unless required by applicable law or agreed to in writing, software
+*  distributed under the License is distributed on an "AS IS" BASIS,
+*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+*  See the License for the specific language governing permissions and
+*  limitations under the License.
+*
+*  Changes done by ¢feh@fehcom.de obeying the above license
+*
+*****************************************************************************/
+#ifndef DKIMSIGN_H
+#define DKIMSIGN_H
+
+#include "dkimbase.h"
+
+class CDKIMSign : public CDKIMBase
+{
+public:
+  CDKIMSign();
+  ~CDKIMSign();
+
+  //int Init() = delete;
+  int Init(DKIMSignOptions* pOptions);
+  int GetSig2(char* szRSAPrivKey,char* szECCPrivKey,char** pszSignature);
+
+  virtual int ProcessHeaders(void) override;
+  virtual int ProcessBody(char* szBuffer,int nBufLength,bool bEOF) override;
+
+  enum CKDKIMConstants { OptimalHeaderLineLength = 65 };
+
+  void Hash(const char* szBuffer,int nBufLength,bool bHdr);
+
+protected:
+
+  bool SignThisTag(const string& sTag);
+  void GetHeaderParams(const string& sHdr);
+  void ProcessHeader(const string& sHdr);
+  bool ParseFromAddress(void);
+
+  void InitSig(void);
+  void AddTagToSig(const char* const Tag,const string &sValue,char cbrk,bool bFold);
+  void AddTagToSig(const char* const Tag,unsigned long nValue);
+  void AddInterTagSpace(int nSizeOfNextTag);
+  void AddFoldedValueToSig(const string &sValue,char cbrk);
+
+  bool IsRequiredHeader(const string& sTag);
+  int ConstructSignature(char* szSignKey,int nSigAlg);
+
+  int AssembleReturnedSig(char* szRSAPrivKey,char* szECCPrivKey);
+
+#if ((OPENSSL_VERSION_NUMBER < 0x10100000L) || (LIBRESSL_VERSION_NUMBER > 0 && LIBRESSL_VERSION_NUMBER < 0x20700000L))
+  EVP_MD_CTX m_Hdr_sha1ctx;    /* the RSA SHA1 signature */
+  EVP_MD_CTX m_Hdr_sha256ctx;  /* the RSA SHA256 signature */
+
+  EVP_MD_CTX m_Bdy_sha1ctx;    /* the SHA1 digest */
+  EVP_MD_CTX m_Bdy_sha256ctx;  /* the SHA256 digest */
+#else
+  EVP_MD_CTX *m_Hdr_sha1ctx;    /* the RSA SHA1 signature */
+  EVP_MD_CTX *m_Hdr_sha256ctx;  /* the RSA SHA256 signature */
+  EVP_MD_CTX *m_Hdr_ed25519ctx; /* the PureEd25519 signature */
+
+  EVP_MD_CTX *m_Bdy_sha1ctx;    /* the SHA1 digest */
+  EVP_MD_CTX *m_Bdy_sha256ctx;  /* the SHA256 digest for RSA */
+  EVP_MD_CTX *m_Edy_sha256ctx;  /* the SHA256 digest for Ed25519 */
+#endif
+
+  int m_Canon;  /* canonization method */
+
+  int m_EmptyLineCount;
+
+  string hParam;
+  string sFrom;
+  string sSender;
+  string sSelector;
+  string eSelector;   /* Used for Ed25519 signatures */
+  string sDomain;
+  string sIdentity;   /* for i= tag, if empty tag will not be included in sig */
+  string sRequiredHeaders;
+
+  bool m_IncludeBodyLengthTag;
+  int m_nBodyLength;
+  time_t m_ExpireTime;
+  int m_nIncludeTimeStamp;      // 0 = don't include t= tag, 1 = include t= tag
+  int m_nIncludeQueryMethod;    // 0 = don't include q= tag, 1 = include q= tag
+  int m_nHash;                  // use one of the DKIM_HASH_xx constants here
+  int m_nIncludeCopiedHeaders;  // 0 = don't include z= tag, 1 = include z= tag
+
+  DKIMHEADERCALLBACK m_pfnHdrCallback;
+
+  string m_sSig;                // DKIM-Signature ....
+  int m_nSigPos;
+
+  string m_sReturnedSig;
+  bool m_bReturnedSigAssembled;
+
+  string m_sCopiedHeaders;
+
+  string SigHdrs;
+  int m_SigHdrs;
+};
+
+#endif // DKIMSIGN_H