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hash_model.py

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  • hash_model.py 6.98 KiB
    #-----------------------------------------------------------------------------
    # SoC Labs Basic SHA-2 Hashing Model Python Reference
    # A joint work commissioned on behalf of SoC Labs, under Arm Academic Access license.
    #
    # Contributors
    #
    # David Mapstone (d.a.mapstone@soton.ac.uk)
    #
    # Copyright  2022, SoC Labs (www.soclabs.org)
    #-----------------------------------------------------------------------------
    
    import os, random, math, csv
    import binascii
    import hashlib
    
    def main():
        # Check Environment Variables set
        if not "SHA_2_ACC_DIR" in os.environ:
            print("Sourceme file at root of repository has not been sourced. Please source this file and try again.")
            quit()
        # Read in Descriptor File
        # - contains number of packets of data to generate and random seed
        stim_file = os.environ["SHA_2_ACC_DIR"] + "/simulate/stimulus/model/" + "model_stim.csv"
        with open(stim_file, "r") as stim:
            csvreader = csv.reader(stim, delimiter=",")
            stim_list = list(csvreader)
        
        seed        = int(stim_list[0][0])
        packets     = int(stim_list[0][1])
        gap_limit   = int(stim_list[0][2])
        stall_limit = int(stim_list[0][3])
        random.seed(seed)
        
        print(f"Generating {packets} packets using seed: {seed}")
        cfg_words_list = []
        cfg_words_gap_list = []
        in_data_words_list = []
        in_data_words_last_list = []
        in_data_words_gap_list = []
        message_block_list = []
        message_block_last_list = []
        message_block_gap_list = []
        message_block_stall_list = []
        hash_list = []
        hash_stall_list = []
        
        for i in range(packets):
            # Generate Gapping and Stalling Values
            #   Gapping - Period to wait before taking Input Valid High
            #   Stalling - Period to wait before taking Output Read High
            cfg_words_gap_list.append(random.randrange(0,gap_limit))
            hash_stall_list.append(random.randrange(0,stall_limit))
            
            # Generate expected output in 512 bit chunks
            cfg_size = math.ceil(random.randint(0,pow(2,14))/8)*8
            cfg_size_bin = "{0:b}".format(cfg_size)
            # Pad Size to 64 bits
            cfg_size_str = "0"*(64-len(cfg_size_bin)) + str(cfg_size_bin)
            
            # Generate Random Data using Size
            data = "{0:b}".format(random.getrandbits(cfg_size))
            data = "0"*(cfg_size - len(data)) + data # Pad Data to length of config (Python like to concatenate values)
            
            
            chunked_data_words = chunkstring(str(data),512)
            in_data_words = chunked_data_words.copy()
            in_data_words[-1] = in_data_words[-1] + "0"*(512-len(in_data_words[-1]))
            in_data_words_last = []
            in_data_words_gap = []
            message_block = chunked_data_words.copy()
            message_block_last = []
            message_block_stall = []
            message_block_gap = []
            last_len = len(chunked_data_words[-1])
            # print(f"{chunked_data_words[-1]} {last_len}")
            if (last_len == 512):
                message_block.append("1" + "0"*447 + cfg_size_str)
            else:
                message_block[-1] = message_block[-1] + "1"
                if last_len > 447: # Size can't fit in last word
                    # Pad last word to 512 bits
                    message_block[-1] = message_block[-1] + "0"*(512 - len(message_block[-1]))
                    # Create New word with Size at the end
                    message_block.append("0"*448 + cfg_size_str)
                else:
                    message_block[-1] = message_block[-1] + "0"*(512 - 64- len(message_block[-1])) + cfg_size_str
            
            for i in range(len(in_data_words)):
                in_data_words_last.append("0")  
                in_data_words_gap.append(random.randrange(0,gap_limit))
            in_data_words_last[-1] = "1"
            
            for i in range(len(message_block)):
                message_block_last.append("0")
                message_block_stall.append(random.randrange(0,stall_limit))
                message_block_gap.append(random.randrange(0,gap_limit))
            message_block_last[-1] = "1"
            
            cfg_words_list.append(cfg_size_str)
            in_data_words_list       += in_data_words
            in_data_words_last_list  += in_data_words_last
            in_data_words_gap_list   += in_data_words_gap
            message_block_list       += message_block
            message_block_last_list  += message_block_last
            message_block_gap_list   += message_block_gap
            message_block_stall_list += message_block_stall
            intval = int(data, 2)
            hash_val = 0
            h=int(data, 2).to_bytes((len(data) + 7) // 8, byteorder='big')
            hash_val = binascii.hexlify(hashlib.sha256(h).digest()).decode()
            hash_list.append(hash_val)
    
        # Write out Input Data Stimulus to Text File
        input_header = ["input_data", "input_data_last"]
        with open(os.environ["SHA_2_ACC_DIR"] + "/simulate/stimulus/testbench/" + "input_data_stim.csv", "w", encoding="UTF8", newline='') as f:
            writer = csv.writer(f)
            for idx, word in enumerate(in_data_words_list):
                writer.writerow(["{0:x}".format(int(word, 2)), in_data_words_last_list[idx], in_data_words_gap_list[idx]])
                
        # Write out Cfg Stimulus to Text File
        input_header = ["input_cfg_size", "input_cfg_scheme", "input_cfg_last"]
        with open(os.environ["SHA_2_ACC_DIR"] + "/simulate/stimulus/testbench/" + "input_cfg_stim.csv", "w", encoding="UTF8", newline='') as f:
            writer = csv.writer(f)
            for idx, word in enumerate(cfg_words_list):
                writer.writerow(["{0:x}".format(int(word, 2)), "0", "1", cfg_words_gap_list[idx]])
                
        # Write out Expected output to text file
        output_header = ["output_data", "output_data_last"]
        with open(os.environ["SHA_2_ACC_DIR"] + "/simulate/stimulus/testbench/" + "output_message_block_ref.csv", "w", encoding="UTF8", newline='') as f:
            writer = csv.writer(f)
            for idx, word in enumerate(message_block_list):
                writer.writerow(["{0:x}".format(int(word, 2)), message_block_last_list[idx], message_block_stall_list[idx]])
    
        # Write out Message Block (Input) to text file
        output_header = ["message_block_data", "message_block_data_last"]
        with open(os.environ["SHA_2_ACC_DIR"] + "/simulate/stimulus/testbench/" + "input_message_block_stim.csv", "w", encoding="UTF8", newline='') as f:
            writer = csv.writer(f)
            for idx, word in enumerate(message_block_list):
                writer.writerow(["{0:x}".format(int(word, 2)), message_block_last_list[idx], message_block_gap_list[idx]])
        
        # Write out hash value to text file
        output_header = ["output_data", "output_data_last"]
        with open(os.environ["SHA_2_ACC_DIR"] + "/simulate/stimulus/testbench/" + "output_hash_ref.csv", "w", encoding="UTF8", newline='') as f:
            writer = csv.writer(f)
            for idx, word in enumerate(hash_list):
                writer.writerow([word, "1", hash_stall_list[idx]])
    
    def chunkstring(string, length):
        array_len = math.ceil(len(string)/length)
        array = []
        for i in range(array_len):
            array.append(string[i*length:i*length + length])
        return array
    
    if __name__ == "__main__":
        main()