Use an EVP base class to reduce repetition

1 files changed, 48 insertions, 0 deletions

diff --git a/src/crypt/cryptclassevp.h b/src/crypt/cryptclassevp.h
new file mode 100644
index 0000000..8e9c66c
--- /dev/null
+++ b/src/crypt/cryptclassevp.h
@@ -0,0 +1,48 @@
+#ifndef CRYPTCLASSEVP_H
+#define CRYPTCLASSEVP_H
+
+#include "cryptclassbase.h"
+
+#include <openssl/evp.h>
+#include <openssl/err.h>
+#include <stdexcept>
+
+/**
+* @author Walter Roth, 2015
+* @brief The CryptClassEvp is a class for symmetric cryptography using OpenSSL's EVP API.
+* Subclasses must overwrite the algorithm function to specify the algorithm to be used.
+* The implementation of algorithm in this class returns a NULL-Cipher object (no encryption).
+* This is quite useful for debugging.
+*
+*/
+class CryptClassEvp : public CryptClassBase
+{
+public:
+    CryptClassEvp();
+    virtual ~CryptClassEvp();
+
+    /**
+    * @brief setAlgorithm Overwrite this function to specify the algorithm to be used.
+    * @param cipher The cipher object e.g. EVP_bf_cbc() for Blowfish in CBC mode.
+    */
+    virtual const EVP_CIPHER *algorithm() = 0;
+
+    /**
+    * @brief encrypt Setup context and key and encrypt m_clearText into m_cryptText.
+    */
+    void encrypt();
+
+    /**
+    * @brief encrypt Setup context and key and decrypt m_cryptText into m_clearText.
+    */
+    void decrypt();
+
+    /**
+    * @brief handleOpenSslError Calls ERR_get_error and sends debug output to stderr.
+    * @param file The __FILE__ makro
+    * @param line The __LINE__ makro
+    * @return
+    */
+    void handleOpenSslError();
+};
+#endif // CRYPTCLASSEVP_H