PresaleWallet data structure

ethstore/src/lib.rs

@@ -45,5 +45,6 @@ pub use self::account::SafeAccount;
 pub use self::error::Error;
 pub use self::ethstore::EthStore;
 pub use self::import::import_accounts;
+pub use self::presale::PresaleWallet;
 pub use self::secret_store::SecretStore;
 

ethstore/src/presale.rs

@@ -1,40 +1,66 @@
+use std::fs;
+use std::path::Path;
 use rcrypto::pbkdf2::pbkdf2;
 use rcrypto::sha2::Sha256;
 use rcrypto::hmac::Hmac;
-use json::PresaleWallet;
+use json;
 use ethkey::{Address, Secret, KeyPair};
 use crypto::Keccak256;
 use {crypto, Error};
 
-fn decrypt_presale_wallet(wallet: &PresaleWallet, password: &str) -> Result<KeyPair, Error> {
+pub struct PresaleWallet {
+	iv: [u8; 16],
+	ciphertext: [u8; 80],
+	address: Address,
+}
+
+impl From<json::PresaleWallet> for PresaleWallet {
+	fn from(wallet: json::PresaleWallet) -> Self {
 		let mut iv = [0u8; 16];
 		iv.copy_from_slice(&wallet.encseed[..16]);
 
 		let mut ciphertext = [0u8; 80];
 		ciphertext.copy_from_slice(&wallet.encseed[16..]);
 
+		PresaleWallet {
+			iv: iv,
+			ciphertext: ciphertext,
+			address: Address::from(wallet.address),
+		}
+	}
+}
+
+impl PresaleWallet {
+	pub fn open<P>(path: P) -> Result<Self, Error> where P: AsRef<Path> {
+		let file = try!(fs::File::open(path));
+		let presale = json::PresaleWallet::load(file).unwrap();
+		Ok(PresaleWallet::from(presale))
+	}
+
+	pub fn decrypt(&self, password: &str) -> Result<KeyPair, Error> {
 		let mut h_mac = Hmac::new(Sha256::new(), password.as_bytes());
 		let mut derived_key = vec![0u8; 16];
 		pbkdf2(&mut h_mac, password.as_bytes(), 2000, &mut derived_key);
 
 		let mut key = [0u8; 64];
-	crypto::aes::decrypt_cbc(&derived_key, &iv, &ciphertext, &mut key);
+		crypto::aes::decrypt_cbc(&derived_key, &self.iv, &self.ciphertext, &mut key);
 
 		let secret = Secret::from(key.keccak256());
 		if let Ok(kp) = KeyPair::from_secret(secret) {
-		if kp.address() == Address::from(&wallet.address) {
+			if kp.address() == self.address {
 				return Ok(kp)
 			}
 		}
 
 		Err(Error::InvalidPassword)
 	}
+}
 
 #[cfg(test)]
 mod tests {
-	use ethkey::{KeyPair, Address};
+	use ethkey::Address;
-	use super::decrypt_presale_wallet;
+	use super::PresaleWallet;
-	use json::PresaleWallet;
+	use json;
 
 	#[test]
 	fn test() {
@@ -46,8 +72,9 @@ mod tests {
 			"btcaddr": "1JvqEc6WLhg6GnyrLBe2ztPAU28KRfuseH"
 		} "#;
 
-		let wallet = PresaleWallet::load(json.as_bytes()).unwrap();
+		let wallet = json::PresaleWallet::load(json.as_bytes()).unwrap();
-		let kp = decrypt_presale_wallet(&wallet, "123").unwrap();
+		let wallet = PresaleWallet::from(wallet);
+		let kp = wallet.decrypt("123").unwrap();
 		assert_eq!(kp.address(), Address::from(wallet.address));
 	}
 }