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use crate::constants::*; use crate::crypto::blake2b::Blake2b; use crate::crypto::digest::Digest; use crate::crypto::util::fixed_time_eq; use crate::errors::*; use crate::helpers::*; use crate::keynum::*; use crate::Result; use std::cmp; use std::fmt::Write as fmtWrite; use std::fmt::{self, Formatter}; use std::fs::OpenOptions; use std::io::{self, Write}; use std::io::{Cursor, Read}; use std::path::Path; #[derive(Clone)] pub struct SecretKey { pub(crate) sig_alg: [u8; TWOBYTES], pub(crate) kdf_alg: [u8; TWOBYTES], pub(crate) chk_alg: [u8; TWOBYTES], pub(crate) kdf_salt: [u8; KDF_SALTBYTES], pub(crate) kdf_opslimit_le: [u8; KEYNUM_BYTES], pub(crate) kdf_memlimit_le: [u8; KEYNUM_BYTES], pub(crate) keynum_sk: KeynumSK, } impl SecretKey { pub fn from_bytes(bytes_buf: &[u8]) -> Result<SecretKey> { let mut buf = Cursor::new(bytes_buf); let mut sig_alg = [0u8; TWOBYTES]; let mut kdf_alg = [0u8; TWOBYTES]; let mut chk_alg = [0u8; TWOBYTES]; let mut kdf_salt = [0u8; KDF_SALTBYTES]; let mut ops_limit = [0u8; KEYNUM_BYTES]; let mut mem_limit = [0u8; KEYNUM_BYTES]; let mut keynum = [0u8; KEYNUM_BYTES]; let mut sk = [0u8; SECRETKEY_BYTES]; let mut chk = [0u8; CHK_BYTES]; buf.read_exact(&mut sig_alg)?; buf.read_exact(&mut kdf_alg)?; buf.read_exact(&mut chk_alg)?; buf.read_exact(&mut kdf_salt)?; buf.read_exact(&mut ops_limit)?; buf.read_exact(&mut mem_limit)?; buf.read_exact(&mut keynum)?; buf.read_exact(&mut sk)?; buf.read_exact(&mut chk)?; Ok(SecretKey { sig_alg, kdf_alg, chk_alg, kdf_salt, kdf_opslimit_le: ops_limit, kdf_memlimit_le: mem_limit, keynum_sk: KeynumSK { keynum, sk, chk }, }) } pub fn to_bytes(&self) -> Vec<u8> { let mut iters = Vec::new(); iters.push(self.sig_alg.iter()); iters.push(self.kdf_alg.iter()); iters.push(self.chk_alg.iter()); iters.push(self.kdf_salt.iter()); iters.push(self.kdf_opslimit_le.iter()); iters.push(self.kdf_memlimit_le.iter()); iters.push(self.keynum_sk.keynum.iter()); iters.push(self.keynum_sk.sk.iter()); iters.push(self.keynum_sk.chk.iter()); let v: Vec<u8> = iters .iter() .flat_map(|b| { let b = b.clone(); b.cloned() }) .collect(); v } pub(crate) fn write_checksum(&mut self) -> Result<()> { let h = self.read_checksum()?; self.keynum_sk.chk.copy_from_slice(&h[..]); Ok(()) } pub(crate) fn read_checksum(&self) -> Result<Vec<u8>> { let mut state = Blake2b::new(CHK_BYTES); state.input(&self.sig_alg); state.input(&self.keynum_sk.keynum); state.input(&self.keynum_sk.sk); let mut h = vec![0u8; CHK_BYTES]; state.result(&mut h); Ok(h) } pub(crate) fn xor_keynum(&mut self, stream: &[u8]) { let b8 = self .keynum_sk .keynum .iter_mut() .zip(stream.iter()) .map(|(byte, stream)| *byte ^= *stream) .count(); let b64 = self .keynum_sk .sk .iter_mut() .zip(stream[b8..].iter()) .map(|(byte, stream)| *byte ^= *stream) .count(); let _b32 = self .keynum_sk .chk .iter_mut() .zip(stream[b8 + b64..].iter()) .map(|(byte, stream)| *byte ^= *stream) .count(); } pub fn from_box(s: &str, password: Option<String>) -> Result<SecretKey> { let mut lines = s.lines(); let sk = { lines.next().ok_or_else(|| { PError::new(ErrorKind::Io, "Missing comment in public key".to_string()) })?; let encoded_buf = lines.next().ok_or_else(|| { PError::new( ErrorKind::Io, "Missing encoded key in public key".to_string(), ) })?; let decoded_buf = base64::decode(encoded_buf.trim()).map_err(|e| PError::new(ErrorKind::Io, e))?; SecretKey::from_bytes(&decoded_buf[..]) }?; let interactive = password.is_none(); let password = match password { Some(password) => password, None => { let password = get_password("Password: ")?; write!( io::stdout(), "Deriving a key from the password and decrypting the secret key... " ) .map_err(|e| PError::new(ErrorKind::Io, e))?; io::stdout().flush()?; password } }; let sk = sk.encrypt(password)?; if interactive { writeln!(io::stdout(), "done").map_err(|e| PError::new(ErrorKind::Io, e))? } let checksum_vec = sk.read_checksum().map_err(|e| e)?; let mut chk = [0u8; CHK_BYTES]; chk.copy_from_slice(&checksum_vec[..]); if chk != sk.keynum_sk.chk { Err(PError::new( ErrorKind::Verify, "Wrong password for that key", )) } else { Ok(sk) } } pub fn to_box(&self, comment: Option<&str>) -> Result<String> { let mut s = String::new(); write!(s, "{}", COMMENT_PREFIX)?; if let Some(comment) = comment { writeln!(s, "{}", comment)?; } else { writeln!(s, "{}", SECRETKEY_DEFAULT_COMMENT)?; } writeln!(s, "{}", self.to_string())?; Ok(s) } pub fn from_file<P: AsRef<Path>>(sk_path: P, password: Option<String>) -> Result<SecretKey> { let mut file = OpenOptions::new() .read(true) .open(sk_path) .map_err(|e| PError::new(ErrorKind::Io, e))?; let mut s = String::new(); file.read_to_string(&mut s)?; SecretKey::from_box(&s, password) } pub(crate) fn encrypt(mut self, password: String) -> Result<SecretKey> { let mut stream = [0u8; CHK_BYTES + SECRETKEY_BYTES + KEYNUM_BYTES]; let opslimit = load_u64_le(&self.kdf_opslimit_le); let memlimit = load_u64_le(&self.kdf_memlimit_le) as usize; let params = raw_scrypt_params(memlimit, opslimit)?; scrypt::scrypt(&password.as_bytes(), &self.kdf_salt, ¶ms, &mut stream)?; self.xor_keynum(&stream); Ok(self) } } impl fmt::Debug for SecretKey { fn fmt(&self, f: &mut Formatter) -> fmt::Result { for byte in self.keynum_sk.sk.iter() { write!(f, "{:x}", byte)? } Ok(()) } } impl cmp::PartialEq for SecretKey { fn eq(&self, other: &SecretKey) -> bool { fixed_time_eq(&self.keynum_sk.sk, &other.keynum_sk.sk) } } impl cmp::Eq for SecretKey {} impl ToString for SecretKey { fn to_string(&self) -> String { base64::encode(self.to_bytes().as_slice()) } }