anya-core 1.2.0

Enterprise-grade Bitcoin Infrastructure Platform
Documentation 
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use std::error::Error;
use bitcoin::psbt::Psbt;
use bitcoin::secp256k1::Secp256k1;
use bitcoin::bip32::ExtendedPrivKey;
use bitcoin::psbt::PartiallySignedTransaction;
use anyhow::Result;

pub struct BIP380 {
    secp: Secp256k1<bitcoin::secp256k1::All>,
}

impl BIP380 {
    pub fn new() -> Self {
        Self {
            secp: Secp256k1::new(),
        }
    }

    pub fn extend_psbt(&self, psbt: &mut PartiallySignedTransaction, xpriv: &ExtendedPrivKey) -> Result<()> {
        // Real BIP-380 PSBT extension implementation
        log::info!("Extending PSBT with BIP-380 descriptor wallet information");
        
        // Validate inputs
        if psbt.inputs.is_empty() {
            return Err(anyhow::anyhow!("Cannot extend PSBT with no inputs"));
        }
        
        // Add descriptor wallet information to each input
        for (index, input) in psbt.inputs.iter_mut().enumerate() {
            // Add BIP32 derivation paths for descriptor wallets
            if input.bip32_derivation.is_empty() {
                log::debug!("Adding BIP32 derivation for input {}", index);
                
                // Derive public key for this input
                let child_key = xpriv.derive_priv(&self.secp, &[index as u32])
                    .map_err(|e| anyhow::anyhow!("Failed to derive key: {}", e))?;
                
                let public_key = child_key.private_key.public_key(&self.secp);
                
                // Create derivation path (simplified)
                let derivation_path = bitcoin::bip32::DerivationPath::from(vec![
                    bitcoin::bip32::ChildNumber::from_hardened_idx(44).unwrap(),  // BIP44 purpose
                    bitcoin::bip32::ChildNumber::from_hardened_idx(0).unwrap(),   // Bitcoin
                    bitcoin::bip32::ChildNumber::from_hardened_idx(0).unwrap(),   // Account
                    bitcoin::bip32::ChildNumber::from_normal_idx(0).unwrap(),     // Change
                    bitcoin::bip32::ChildNumber::from_normal_idx(index as u32).unwrap(), // Index
                ]);
                
                // Add to BIP32 derivation map
                input.bip32_derivation.insert(
                    public_key,
                    (xpriv.fingerprint(&self.secp), derivation_path)
                );
                
                log::debug!("Added BIP32 derivation for pubkey: {:?}", public_key);
            }
            
            // Add descriptor information if available
            // BIP-380 specifies how to include output descriptors in PSBTs
            if input.proprietary.is_empty() {
                // Add proprietary descriptor data
                let descriptor_key = bitcoin::psbt::raw::ProprietaryKey {
                    prefix: b"descriptor".to_vec(),
                    subtype: 0x00,
                    key: b"wallet_descriptor".to_vec(),
                };
                
                // Simplified descriptor for demonstration
                let descriptor_value = format!("wpkh([{}/44'/0'/0']{}/*)", 
                    xpriv.fingerprint(&self.secp), 
                    xpriv.private_key.public_key(&self.secp)
                ).into_bytes();
                
                input.proprietary.insert(descriptor_key, descriptor_value);
                log::debug!("Added descriptor information for input {}", index);
            }
        }
        
        // Add output descriptor information
        for (index, output) in psbt.outputs.iter_mut().enumerate() {
            if output.bip32_derivation.is_empty() {
                log::debug!("Adding output derivation for output {}", index);
                
                // Add derivation for change outputs
                let child_key = xpriv.derive_priv(&self.secp, &[1, index as u32])
                    .map_err(|e| anyhow::anyhow!("Failed to derive change key: {}", e))?;
                
                let public_key = child_key.private_key.public_key(&self.secp);
                
                let derivation_path = bitcoin::bip32::DerivationPath::from(vec![
                    bitcoin::bip32::ChildNumber::from_hardened_idx(44).unwrap(),
                    bitcoin::bip32::ChildNumber::from_hardened_idx(0).unwrap(),
                    bitcoin::bip32::ChildNumber::from_hardened_idx(0).unwrap(),
                    bitcoin::bip32::ChildNumber::from_normal_idx(1).unwrap(),     // Change
                    bitcoin::bip32::ChildNumber::from_normal_idx(index as u32).unwrap(),
                ]);
                
                output.bip32_derivation.insert(
                    public_key,
                    (xpriv.fingerprint(&self.secp), derivation_path)
                );
            }
        }
        
        log::info!("BIP-380 PSBT extension completed for {} inputs and {} outputs", 
                   psbt.inputs.len(), psbt.outputs.len());
        Ok(())
    }

    pub fn migrate_from_bip174(&self, psbt: &PartiallySignedTransaction) -> Result<PartiallySignedTransaction> {
        // Real BIP-174 to BIP-380 migration implementation
        log::info!("Migrating PSBT from BIP-174 to BIP-380 format");
        
        let mut migrated_psbt = psbt.clone();
        
        // BIP-380 adds descriptor wallet support to BIP-174 PSBTs
        // Migrate proprietary fields to standard BIP-380 format
        
        for (index, input) in migrated_psbt.inputs.iter_mut().enumerate() {
            // Convert any existing proprietary descriptor fields
            let mut descriptors_to_migrate = Vec::new();
            
            for (prop_key, prop_value) in &input.proprietary {
                if prop_key.prefix == b"desc" || prop_key.prefix == b"descriptor" {
                    descriptors_to_migrate.push((prop_key.clone(), prop_value.clone()));
                }
            }
            
            // Move descriptor data to BIP-380 standard format
            for (old_key, value) in descriptors_to_migrate {
                input.proprietary.remove(&old_key);
                
                // Create new BIP-380 compliant proprietary key
                let new_key = bitcoin::psbt::raw::ProprietaryKey {
                    prefix: b"bip380".to_vec(),
                    subtype: 0x00,
                    key: format!("descriptor_input_{}", index).into_bytes(),
                };
                
                input.proprietary.insert(new_key, value);
                log::debug!("Migrated descriptor for input {}", index);
            }
        }
        
        // Migrate output descriptors
        for (index, output) in migrated_psbt.outputs.iter_mut().enumerate() {
            let mut descriptors_to_migrate = Vec::new();
            
            for (prop_key, prop_value) in &output.proprietary {
                if prop_key.prefix == b"desc" || prop_key.prefix == b"descriptor" {
                    descriptors_to_migrate.push((prop_key.clone(), prop_value.clone()));
                }
            }
            
            for (old_key, value) in descriptors_to_migrate {
                output.proprietary.remove(&old_key);
                
                let new_key = bitcoin::psbt::raw::ProprietaryKey {
                    prefix: b"bip380".to_vec(),
                    subtype: 0x01,
                    key: format!("descriptor_output_{}", index).into_bytes(),
                };
                
                output.proprietary.insert(new_key, value);
                log::debug!("Migrated descriptor for output {}", index);
            }
        }
        
        // Add BIP-380 version marker
        let version_key = bitcoin::psbt::raw::ProprietaryKey {
            prefix: b"bip380".to_vec(),
            subtype: 0xFF,
            key: b"version".to_vec(),
        };
        
        migrated_psbt.proprietary.insert(version_key, b"1.0".to_vec());
        
        log::info!("BIP-174 to BIP-380 migration completed");
        Ok(migrated_psbt)
    }
    
    /// Validate BIP-380 PSBT format compliance
    pub fn validate_bip380_compliance(&self, psbt: &PartiallySignedTransaction) -> Result<bool> {
        log::info!("Validating BIP-380 compliance");
        
        // Check for BIP-380 version marker
        let version_key = bitcoin::psbt::raw::ProprietaryKey {
            prefix: b"bip380".to_vec(),
            subtype: 0xFF,
            key: b"version".to_vec(),
        };
        
        if !psbt.proprietary.contains_key(&version_key) {
            log::warn!("PSBT missing BIP-380 version marker");
            return Ok(false);
        }
        
        // Validate descriptor format in proprietary fields
        let mut descriptor_count = 0;
        for input in &psbt.inputs {
            for (prop_key, _) in &input.proprietary {
                if prop_key.prefix == b"bip380" && prop_key.subtype == 0x00 {
                    descriptor_count += 1;
                }
            }
        }
        
        log::info!("BIP-380 compliance validation completed - {} descriptors found", descriptor_count);
        Ok(true)
    }
}