ECDSA Key Generation

This project provides a C implementation for generating compressed public keys from private keys using the ECDSA (Elliptic Curve Digital Signature Algorithm) with the secp256k1 curve.

Features

• Generate compressed public keys from private keys
• Uses OpenSSL library for cryptographic operations
• Supports secp256k1 curve

Prerequisites

Before you begin, ensure you have met the following requirements:

• GCC compiler
• OpenSSL development libraries

On Ubuntu or Debian-based systems, you can install OpenSSL development libraries with:

sudo apt-get install libssl-dev

Compilation

To compile the project, use the following command:

gcc -o ecdsa_keygen ecdsa_keygen.c -lssl -lcrypto

Usage

After compilation, you can run the program with:

./ecdsa_keygen

The program will generate a compressed public key from a hardcoded private key and print it to the console.

File Structure

• ecdsa_keygen.c: Main source file containing the implementation
• ecdsa_keygen.h: Header file with function declarations

Function Documentation

int generate_compressed_public_key(const uint8_t *private_key, uint8_t *compressed_public_key)

Generates a compressed public key from a given private key.

Parameters:

• private_key: Pointer to a 32-byte array containing the private key
• compressed_public_key: Pointer to a 33-byte array where the compressed public key will be stored

Returns:

• The length of the compressed public key on success
• -1 on failure

License

This project is open source and available under the MIT License.

Contributing

Contributions to this project are welcome. Please fork the repository and submit a pull request with your changes.