Custom Hexadecimal String Hash in C++

This C++ program converts a given string into a unique 8-digit hexadecimal hash using a custom hashing algorithm based on prime multiplication and XOR operations.

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Features

• Takes a string input and outputs a hexadecimal hash.
• Lightweight and simple to understand.
• Uses a custom algorithm (not based on any standard library hash functions).
• Outputs hash in lowercase hexadecimal format with consistent 8-character width.

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How It Works

1. Initializes a 32-bit unsigned integer (hash) to 0.
2. Iterates over each character in the input string:
   • Multiplies the current hash by 31 (a prime number).
   • Applies XOR (^) with the ASCII value of the character.
3. Converts the final hash value into an 8-digit hexadecimal string using stringstream.

Note: This is not a cryptographic hash and is not intended for secure applications. It's smiply for education purpose.

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Sample Run

Convert a string to hash: hello
Custom hash of "hello":
  - #1c0f7e0c

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Limitations

• Not collision-resistant.
• Not suitable for cryptographic or secure hashing use cases.