text: /*
  
  Authors: Sameer Wagh, Mayank Rathee, Nishant Kumar.
  
  Copyright:
  Copyright (c) 2020 Microsoft Research
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
  
  */
  
  #ifndef AESOBJECT_H
  #define AESOBJECT_H
  
  #pragma once
  #include <algorithm>
  #include "globals.h"
  #include <openssl/evp.h>
  #include <openssl/aes.h>
  
  typedef __m128i block;
  //NOTE: This class isn't thread safe.
  class AESObject
  {
  private:
  	//AES variables
  	__m128i pseudoRandomString[RANDOM_COMPUTE];
  	__m128i tempSecComp[RANDOM_COMPUTE];
  	unsigned long rCounter = -1;
  
  	//Extraction variables
  	__m128i randomBitNumber {0};
  	uint8_t randomBitCounter = 0;
  	__m128i random8BitNumber {0};
  	uint8_t random8BitCounter = 0; 
  	__m128i random64BitNumber {0};
  	bool fetch64New = true;
  
  	unsigned char* inbuf_ssl;
  	unsigned char* outbuf_ssl;
  	unsigned char* key_ssl;
  	unsigned char* iv_ssl;
  	
  	EVP_CIPHER_CTX* ctx_ssl;
  	
  
  	//Private extraction functions
  	__m128i newRandomNumber();
  
  	//Private helper functions
  	smallType AES_random(int i);
  
  #ifdef PRECOMPUTEAES
  	__m128i* preComputedKeys = NULL;
  	__m128i* tempKeyArray = NULL;
  	
  	void PreComputeKeysFunc(porthosLongUnsignedInt startKeyNum, 
  			porthosLongUnsignedInt numKeys);
  #endif
  
  public:
  	//Constructor
  	AESObject(string filename);
  	
  	~AESObject();
  
  #ifdef PRECOMPUTEAES
  	void PreComputeKeys(porthosLongUnsignedInt numKeysToPrecompute, 
  			int32_t numThreads);
  #endif
  	
  	void SSL_AES_ecb_encrypt_chunk_in_out(block *in, block *out, unsigned nblks);
  	
  	//Randomness functions
  	porthosSecretType get64Bits();
  	
  	smallType get8Bits();
  	
  	smallType getBit();
  	
  	//Other randomness functions
  	smallType randModPrime();
  	
  	smallType randNonZeroModPrime();
  	
  	porthosSecretType randModuloOdd();
  	
  	void AES_random_shuffle(vector<smallType> &vec, 
  			size_t begin_offset, 
  			size_t end_offset);
  
  	unsigned long getRCounter()
  	{
  		return rCounter;
  	}
  
  #ifdef PRECOMPUTEAES
  
  	__m128i* getPreComputedKeysPtr()
  	{
  		return preComputedKeys;
  	}
  	
  	void fillWithRandomBits64(porthosSecretType* arr, 
  			size_t size);
  	
  	void fillWithRandomBits8(uint8_t* arr, 
  			size_t size);
  	
  	void fillWithRandomModuloPrimeBits(uint8_t* arr, 
  			size_t size);
  	
  	void fillWithRandomModuloOddBits(porthosSecretType* arr, 
  			size_t size);
  	
  #endif
  };
  
  
  
  #endif
  