anya-core 1.2.0

Enterprise-grade Bitcoin Infrastructure Platform
Documentation 
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//! Digital Signature Module
//!
//! This module provides cryptographic signature functionality for Bitcoin security.

use std::error::Error;

/// Supported signature algorithms
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum SignatureAlgorithm {
    /// ECDSA with secp256k1 curve (Bitcoin standard)
    EcdsaSecp256k1,
    /// Schnorr signature with secp256k1 curve (Bitcoin Taproot)
    SchnorrSecp256k1,
    /// EdDSA with Curve25519 (Ed25519)
    Ed25519,
}

/// A digital signature
#[derive(Debug, Clone)]
pub struct Signature {
    /// Raw signature bytes
    pub bytes: Vec<u8>,
    /// The algorithm used to create this signature
    pub algorithm: SignatureAlgorithm,
}

/// Sign a message with the provided private key
pub fn sign(
    _message: &[u8],
    _private_key: &[u8],
    algorithm: SignatureAlgorithm,
) -> Result<Signature, Box<dyn Error>> {
    // Placeholder implementation
    // In a real implementation, we would use a crypto library like secp256k1, etc.
    let sig_len = match algorithm {
        SignatureAlgorithm::EcdsaSecp256k1 => 64,
        SignatureAlgorithm::SchnorrSecp256k1 => 64,
        SignatureAlgorithm::Ed25519 => 64,
    };

    Ok(Signature {
        bytes: vec![0u8; sig_len],
        algorithm,
    })
}

/// Verify a signature against a message and public key
pub fn verify(
    _message: &[u8],
    _signature: &Signature,
    _public_key: &[u8],
) -> Result<bool, Box<dyn Error>> {
    // Placeholder implementation
    // In a real implementation, we would use a crypto library like secp256k1, etc.
    Ok(true)
}

/// Sign a message with ECDSA using the secp256k1 curve (Bitcoin standard)
pub fn ecdsa_sign_secp256k1(
    message: &[u8],
    private_key: &[u8],
) -> Result<Signature, Box<dyn Error>> {
    sign(message, private_key, SignatureAlgorithm::EcdsaSecp256k1)
}

/// Verify an ECDSA signature using the secp256k1 curve (Bitcoin standard)
pub fn ecdsa_verify_secp256k1(
    message: &[u8],
    signature: &[u8],
    public_key: &[u8],
) -> Result<bool, Box<dyn Error>> {
    let sig = Signature {
        bytes: signature.to_vec(),
        algorithm: SignatureAlgorithm::EcdsaSecp256k1,
    };
    verify(message, &sig, public_key)
}

/// Sign a message with Schnorr using the secp256k1 curve (Bitcoin Taproot)
pub fn schnorr_sign_secp256k1(
    message: &[u8],
    private_key: &[u8],
) -> Result<Signature, Box<dyn Error>> {
    sign(message, private_key, SignatureAlgorithm::SchnorrSecp256k1)
}

/// Verify a Schnorr signature using the secp256k1 curve (Bitcoin Taproot)
pub fn schnorr_verify_secp256k1(
    message: &[u8],
    signature: &[u8],
    public_key: &[u8],
) -> Result<bool, Box<dyn Error>> {
    let sig = Signature {
        bytes: signature.to_vec(),
        algorithm: SignatureAlgorithm::SchnorrSecp256k1,
    };
    verify(message, &sig, public_key)
}