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utils/include/SHA.h

@@ -0,0 +1,49 @@
+//
+// Created by Stepan Usatiuk on 15.04.2023.
+//
+
+#ifndef SEMBACKUP_SHA_H
+#define SEMBACKUP_SHA_H
+
+#include <array>
+#include <memory>
+#include <vector>
+
+#include <openssl/evp.h>
+
+/// Class to handle SHA hashing
+/**
+ * Based on: https://wiki.openssl.org/index.php/EVP_Message_Digests
+ */
+class SHA {
+public:
+    /// Constructs an empty SHA hasher instance
+    /// \throws     Exception on initialization error
+    SHA();
+
+    /// Calculates the hash for a given \p in char vector
+    /// \param in   Constant reference to an input vector
+    /// \return     SHA hash of \p in
+    static std::string calculate(const std::vector<char> &in);
+
+    /// Calculates the hash for a given \p in string
+    /// \param in   Constant reference to an input string
+    /// \return     SHA hash of \p in
+    static std::string calculate(const std::string &in);
+
+    /// Append a vector of chars to the current hash
+    /// \param in   Constant reference to an input vector
+    /// \throws     Exception on any error
+    void feedData(const std::vector<char> &in);
+
+    /// Returns the hash, resets the hashing context
+    /// \throws     Exception on any error
+    std::string getHash();
+
+private:
+    const std::unique_ptr<EVP_MD_CTX, decltype(&EVP_MD_CTX_free)> mdctx{EVP_MD_CTX_new(),
+                                                                        &EVP_MD_CTX_free};///< Current hashing context
+};
+
+
+#endif//SEMBACKUP_SHA_H