Renamed class GCryptWrapper to GWrapper

2022-05-22 13:07:40 +02:00
parent 875e9a34f9
commit c0b6bff8b7
3 changed files with 13 additions and 14 deletions
@@ -0,0 +1,114 @@
+#include "GCrypt/GWrapper.h"
+#include "GCrypt/GCipher.h"
+#include "GCrypt/Util.h"
+
+namespace Leonetienne::GCrypt {
+
+  std::string GWrapper::EncryptString(const std::string& cleartext, const std::string& password) {
+    // Transform the password to a key
+    const Block key = PasswordToKey(password);
+
+    // Recode the ascii-string to bits
+    const Flexblock cleartext_bits = StringToBits(cleartext);
+
+    // Encrypt our cleartext bits
+    const Flexblock ciphertext_bits = CipherFlexblock(cleartext_bits, key, GCipher::DIRECTION::ENCIPHER);
+
+    // Recode the ciphertext bits to a hex-string
+    const std::string ciphertext = BitsToHexstring(ciphertext_bits);
+
+    // Return it
+    return ciphertext;
+  }
+
+  std::string GWrapper::DecryptString(const std::string& ciphertext, const std::string& password) {
+    // Transform the password to a key
+    const Block key = PasswordToKey(password);
+
+    // Recode the hex-string to bits
+    const Flexblock ciphertext_bits = HexstringToBits(ciphertext);
+
+    // Decrypt the ciphertext bits
+    const std::string cleartext_bits = CipherFlexblock(ciphertext_bits, key, GCipher::DIRECTION::DECIPHER);
+
+    // Recode the cleartext bits to an ascii-string
+    const std::string cleartext = BitsToString(cleartext_bits);
+
+    // Return it
+    return cleartext;
+  }
+
+  bool GWrapper::EncryptFile(const std::string& filename_in, const std::string& filename_out, const std::string& password, bool printProgressReport) {
+    try {
+      // Read the file to bits
+      const Flexblock cleartext_bits = ReadFileToBits(filename_in);
+
+      // Transform the password to a key
+      const Block key = PasswordToKey(password);
+
+      // Encrypt our cleartext bits
+      const Flexblock ciphertext_bits = CipherFlexblock(cleartext_bits, key, GCipher::DIRECTION::ENCIPHER);
+
+      // Write our ciphertext bits to file
+      WriteBitsToFile(filename_out, ciphertext_bits);
+
+      return true;
+    }
+    catch (std::runtime_error&) {
+      return false;
+    }
+  }
+
+  bool GWrapper::DecryptFile(const std::string& filename_in, const std::string& filename_out, const std::string& password, bool printProgressReport) {
+    try {
+      // Read the file to bits
+      const Flexblock ciphertext_bits = ReadFileToBits(filename_in);
+
+      // Transform the password to a key
+      const Block key = PasswordToKey(password);
+
+      // Decrypt the ciphertext bits
+      const Flexblock cleartext_bits = CipherFlexblock(ciphertext_bits, key, GCipher::DIRECTION::DECIPHER);
+
+      // Write our cleartext bits to file
+      WriteBitsToFile(filename_out, cleartext_bits);
+
+      return true;
+    }
+    catch (std::runtime_error&) {
+      return false;
+    }
+  }
+
+  Flexblock GWrapper::CipherFlexblock(
+      const Flexblock& data,
+      const Block& key,
+      const GCipher::DIRECTION direction)
+  {
+    // Split input into blocks
+    std::vector<Block> blocks;
+
+    for (std::size_t i = 0; i < data.size(); i += BLOCK_SIZE) {
+      blocks.push_back(Block(
+        PadStringToLength(data.substr(i, BLOCK_SIZE), BLOCK_SIZE, '0', false))
+      );
+    }
+
+    // Create cipher instance
+    GCipher cipher(key, direction);
+
+    for (Block& block : blocks) {
+      block = cipher.Digest(block);
+    }
+
+    // Concatenate ciphertext blocks back into a flexblock
+    std::stringstream ss;
+    for (Block& b : blocks) {
+      ss << b;
+    }
+
+    // Return it
+    return ss.str();
+  }
+}
+