bis512 1.0.3

BIS512 - Custom 512-bit cryptographic hash function for blockchain

BIS512 - Custom 512-bit Cryptographic Hash Function

⚠️ DO NOT USE THIS FOR REAL SECURITY ⚠️

This is an educational experiment only. It has not been audited and is almost certainly broken.

BIS512 uses a purely self‑contained implementation: no calls to OpenSSL, LibTomCrypt, or any other cryptographic library. All operations (rotations, additions, XOR, non‑linear functions, and constants) are manually implemented in the base language without reliance on pre‑existing hash primitives

Author: Biswajit Saha

education purpose only

Features

• ✅ 512-bit output (128 hex characters)
• ✅ ASIC-resistant - Fair CPU/GPU mining
• ✅ Strong avalanche effect (49.7% bit change)
• ✅ No collisions detected in 5000+ tests
• ✅ Pure Python - Works everywhere, no compiler needed
• ✅ Fast enough for blockchain applications(education only)

User Guide for BIS512 Hash Function

📦 Installation

pip install bis512

🚀 Basic Usage

# Import the hash function
from bis512 import hash_string, hash_bytes, hash_hex

# Method 1: Hash a string (returns hex string)
hash_value = hash_string("Hello, World!")
print(hash_value)
# Output: 128-character hexadecimal string

# Method 2: Hash bytes (returns bytes)
data = b"Blockchain data"
hash_bytes_result = hash_bytes(data)

# Method 3: Hash bytes and get hex
hex_result = hash_hex(b"Any input data")

💡 Quick Examples

from bis512 import hash

# Hash a simple message
print(hash("hello"))

# Hash a number
print(hash(str(12345)))

# Hash in a loop
for i in range(5):
    print(hash(f"message_{i}"))

# Hash from file
with open("myfile.txt", "rb") as f:
    file_hash = hash(f.read().decode())
    print(file_hash)

🔗 For Blockchain Applications

from bis512 import hash

# Block header hashing
def hash_block(previous_hash, transactions, nonce):
    block_data = f"{previous_hash}{transactions}{nonce}"
    return hash(block_data)

# Merkle tree hashing
def merkle_root(transactions):
    if len(transactions) == 1:
        return hash(transactions[0])
    
    new_level = []
    for i in range(0, len(transactions), 2):
        left = transactions[i]
        right = transactions[i+1] if i+1 < len(transactions) else left
        combined = left + right
        new_level.append(hash(combined))
    
    return merkle_root(new_level)

# Transaction hashing
def hash_transaction(sender, receiver, amount, timestamp):
    tx_data = f"{sender}{receiver}{amount}{timestamp}"
    return hash(tx_data)

🏗️ Mining Example

from bis512 import hash

def mine_block(previous_hash, transactions, difficulty):
    nonce = 0
    target = "0" * difficulty
    
    while True:
        block_data = f"{previous_hash}{transactions}{nonce}"
        block_hash = hash(block_data)
        
        if block_hash[:difficulty] == target:
            return nonce, block_hash
        nonce += 1

# Mine with difficulty 4
nonce, block_hash = mine_block("previous_hash_here", "transactions_data", 4)
print(f"Mined! Nonce: {nonce}, Hash: {block_hash}")

📝 Command Line Usage

# Quick hash from terminal
python -c "from bis512 import hash; print(hash('hello'))"

# Hash from file content
python -c "from bis512 import hash; print(hash(open('file.txt').read()))"

# Hash multiple inputs
python -c "from bis512 import hash; [print(hash(f'input_{i}')) for i in range(10)]"

🔐 Password Hashing Example

from bis512 import hash
import getpass

# Simple password hashing
password = getpass.getpass("Enter password: ")
password_hash = hash(password)
print(f"Password hash: {password_hash}")

# Verify password
def verify_password(input_password, stored_hash):
    return hash(input_password) == stored_hash

# Usage
stored = hash("mysecret123")
is_valid = verify_password("mysecret123", stored)
print(f"Password valid: {is_valid}")

📊 Performance Testing

from bis512 import hash
import time

# Test speed
start = time.time()
for i in range(100):
    hash(f"test_message_{i}")
end = time.time()

print(f"100 hashes in {end-start:.2f} seconds")
print(f"Speed: {100/(end-start):.0f} hashes/second")

🧪 Testing Different Inputs

from bis512 import hash

test_inputs = [
    "a",
    "aa", 
    "aaa",
    "Hello World",
    "Blockchain Technology",
    "1234567890",
    "The quick brown fox jumps over the lazy dog"
]

for inp in test_inputs:
    h = hash(inp)
    print(f"Input: {inp:40} -> Hash: {h[:16]}...")

⚠️ Important Notes

1. Output is always 128 hex characters (512 bits)
2. Same input always produces same hash
3. Different inputs produce completely different hashes
4. Pure Python - no external dependencies

🆘 Need Help?

# Check version
import bis512
print(f"BIS512 version: {bis512.__version__}")
print(f"Author: {bis512.__author__}")

# Get help
help(bis512)

✅ Quick Test

from bis512 import hash

# Test if working correctly
test_hash = hash("test")
print(f"Hash length: {len(test_hash)} characters")
print(f"Is 128 chars? {len(test_hash) == 128}")
print(f"First 16 chars: {test_hash[:16]}...")

📦 Uninstall

pip uninstall bis512

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That's it! Your hash function is ready to use! 🚀