Merge pull request #26 from gavofyork/gav

Additional work & convenience functions on crypto, bytes & hash.
This commit is contained in:
Marek Kotewicz 2016-01-08 00:39:07 +01:00
commit d4cbad11ca
8 changed files with 111 additions and 16 deletions

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@ -306,10 +306,28 @@ impl <T>FromBytes for T where T: FixedHash {
use std::{mem, ptr};
let mut res: T = mem::uninitialized();
ptr::copy(bytes.as_ptr(), res.mut_bytes().as_mut_ptr(), T::size());
ptr::copy(bytes.as_ptr(), res.as_slice_mut().as_mut_ptr(), T::size());
Ok(res)
}
}
}
// TODO: tests and additional docs for these two.
/// Simple trait to allow for raw population of a Sized object from a byte slice.
pub trait Populatable {
/// Populate self from byte slice `d` in a raw fashion.
fn populate_raw(&mut self, d: &[u8]);
}
impl<T> Populatable for T where T: Sized {
fn populate_raw(&mut self, d: &[u8]) {
use std::mem;
use std::slice;
use std::io::Write;
unsafe {
slice::from_raw_parts_mut(self as *mut T as *mut u8, mem::size_of::<T>())
}.write(&d).unwrap();
}
}

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@ -7,6 +7,21 @@ pub type Secret=H256;
pub type Public = H512;
pub type Signature = H520;
impl Signature {
/// Create a new signature from the R, S and V componenets.
pub fn from_rsv(r: &H256, s: &H256, v: u8) -> Signature {
use std::ptr;
let mut ret: Signature = Signature::new();
unsafe {
let retslice: &mut [u8] = &mut ret;
ptr::copy(r.as_ptr(), retslice.as_mut_ptr(), 32);
ptr::copy(s.as_ptr(), retslice.as_mut_ptr().offset(32), 32);
}
ret[64] = v;
ret
}
}
#[derive(Debug)]
pub enum CryptoError {
InvalidSecret,
@ -92,6 +107,9 @@ impl KeyPair {
pub fn secret(&self) -> &Secret {
&self.secret
}
/// Sign a message with our secret key.
pub fn sign(&self, message: &H256) -> Result<Signature, CryptoError> { sign(&self.secret, message) }
}
/// Recovers Public key from signed message hash.
@ -102,8 +120,11 @@ pub fn recover(signature: &Signature, message: &H256) -> Result<Public, CryptoEr
let publ = try!(context.recover(&try!(Message::from_slice(&message)), &rsig));
let serialized = publ.serialize_vec(&context, false);
let p: Public = Public::from_slice(&serialized[1..65]);
//TODO: check if it's the zero key and fail if so.
Ok(p)
}
/// Returns siganture of message hash.
pub fn sign(secret: &Secret, message: &H256) -> Result<Signature, CryptoError> {
use secp256k1::*;
@ -116,6 +137,16 @@ pub fn sign(secret: &Secret, message: &H256) -> Result<Signature, CryptoError> {
signature[64] = rec_id.to_i32() as u8;
Ok(signature)
}
/// Check if each component of the signature is in range.
pub fn is_valid(sig: &Signature) -> bool {
sig[64] <= 1 &&
H256::from_slice(&sig[0..32]) < h256_from_hex("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141") &&
H256::from_slice(&sig[32..64]) < h256_from_hex("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141") &&
H256::from_slice(&sig[32..64]) >= h256_from_u64(1) &&
H256::from_slice(&sig[0..32]) >= h256_from_u64(1)
}
/// Verify signature.
pub fn verify(public: &Public, signature: &Signature, message: &H256) -> Result<bool, CryptoError> {
use secp256k1::*;
@ -142,6 +173,8 @@ mod tests {
use hash::*;
use crypto::*;
// TODO: tests for sign/recover roundtrip, at least.
#[test]
fn test_signature() {
let pair = KeyPair::create().unwrap();
@ -154,14 +187,14 @@ mod tests {
#[test]
fn test_invalid_key() {
assert!(KeyPair::from_secret(Secret::from_str("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()).is_err());
assert!(KeyPair::from_secret(Secret::from_str("0000000000000000000000000000000000000000000000000000000000000000").unwrap()).is_err());
assert!(KeyPair::from_secret(Secret::from_str("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141").unwrap()).is_err());
assert!(KeyPair::from_secret(h256_from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")).is_err());
assert!(KeyPair::from_secret(h256_from_hex("0000000000000000000000000000000000000000000000000000000000000000")).is_err());
assert!(KeyPair::from_secret(h256_from_hex("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141")).is_err());
}
#[test]
fn test_key() {
let pair = KeyPair::from_secret(Secret::from_str("6f7b0d801bc7b5ce7bbd930b84fd0369b3eb25d09be58d64ba811091046f3aa2").unwrap()).unwrap();
let pair = KeyPair::from_secret(h256_from_hex("6f7b0d801bc7b5ce7bbd930b84fd0369b3eb25d09be58d64ba811091046f3aa2")).unwrap();
assert_eq!(pair.public().hex(), "101b3ef5a4ea7a1c7928e24c4c75fd053c235d7b80c22ae5c03d145d0ac7396e2a4ffff9adee3133a7b05044a5cee08115fd65145e5165d646bde371010d803c");
}
}

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@ -5,6 +5,7 @@ use std::fmt;
use std::ops;
use std::hash::{Hash, Hasher};
use std::ops::{Index, IndexMut, Deref, DerefMut, BitOr, BitAnd};
use std::cmp::{PartialOrd, Ordering};
use rustc_serialize::hex::*;
use error::EthcoreError;
use rand::Rng;
@ -21,7 +22,7 @@ pub trait FixedHash: Sized + BytesConvertable {
fn random() -> Self;
fn randomize(&mut self);
fn size() -> usize;
fn mut_bytes(&mut self) -> &mut [u8];
fn as_slice_mut(&mut self) -> &mut [u8];
fn from_slice(src: &[u8]) -> Self;
fn clone_from_slice(&mut self, src: &[u8]) -> usize;
fn shift_bloom<'a, T>(&'a mut self, b: &T) -> &'a mut Self where T: FixedHash;
@ -77,7 +78,7 @@ macro_rules! impl_hash {
$size
}
fn mut_bytes(&mut self) -> &mut [u8] {
fn as_slice_mut(&mut self) -> &mut [u8] {
&mut self.0
}
@ -142,7 +143,7 @@ macro_rules! impl_hash {
ptr += 1;
}
index &= mask;
ret.mut_bytes()[m - 1 - index / 8] |= 1 << (index % 8);
ret.as_slice_mut()[m - 1 - index / 8] |= 1 << (index % 8);
}
ret
@ -208,6 +209,19 @@ macro_rules! impl_hash {
}
}
impl PartialOrd for $from {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
for i in 0..$size {
if self.0[i] > other.0[i] {
return Some(Ordering::Greater);
} else if self.0[i] < other.0[i] {
return Some(Ordering::Less);
}
}
Some(Ordering::Equal)
}
}
impl Hash for $from {
fn hash<H>(&self, state: &mut H) where H: Hasher {
state.write(&self.0);
@ -340,6 +354,26 @@ impl From<Address> for H256 {
}
}
pub fn h256_from_hex(s: &str) -> H256 {
use std::str::FromStr;
H256::from_str(s).unwrap()
}
pub fn h256_from_u64(n: u64) -> H256 {
use uint::U256;
H256::from(&U256::from(n))
}
pub fn address_from_hex(s: &str) -> Address {
use std::str::FromStr;
Address::from_str(s).unwrap()
}
pub fn address_from_u64(n: u64) -> Address {
let h256 = h256_from_u64(n);
From::from(h256)
}
impl_hash!(H32, 4);
impl_hash!(H64, 8);
impl_hash!(H128, 16);

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@ -193,8 +193,11 @@ impl Encoder for BasicEncoder {
}
}
fn emit_list<F>(&mut self, f: F) -> () where F: FnOnce(&mut Self) -> ()
{
fn emit_raw(&mut self, bytes: &[u8]) -> () {
self.bytes.append_slice(bytes);
}
fn emit_list<F>(&mut self, f: F) -> () where F: FnOnce(&mut Self) -> () {
// get len before inserting a list
let before_len = self.bytes.len();

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@ -5,6 +5,8 @@ pub trait Decoder: Sized {
where F: FnOnce(&[u8]) -> Result<T, DecoderError>;
fn as_list(&self) -> Result<Vec<Self>, DecoderError>;
fn as_raw(&self) -> &[u8];
}
pub trait Decodable: Sized {
@ -185,6 +187,7 @@ pub trait View<'a, 'view>: Sized {
pub trait Encoder {
fn emit_value(&mut self, bytes: &[u8]) -> ();
fn emit_list<F>(&mut self, f: F) -> () where F: FnOnce(&mut Self) -> ();
fn emit_raw(&mut self, bytes: &[u8]) -> ();
}
pub trait Encodable {

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@ -305,6 +305,10 @@ impl<'a> Decoder for BasicDecoder<'a> {
}
}
fn as_raw(&self) -> &[u8] {
self.rlp.raw()
}
fn as_list(&self) -> Result<Vec<Self>, DecoderError> {
let v: Vec<BasicDecoder<'a>> = self.rlp.iter()
.map(| i | BasicDecoder::new(i))

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@ -27,7 +27,7 @@ impl<T> Hashable for T where T: BytesConvertable {
let mut keccak = Keccak::new_keccak256();
keccak.update(self.bytes());
let mut ret: H256 = uninitialized();
keccak.finalize(ret.mut_bytes());
keccak.finalize(ret.as_slice_mut());
ret
}
}

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@ -686,7 +686,7 @@ mod tests {
0 => encode(&j),
_ => {
let mut h = H256::new();
h.mut_bytes()[31] = j as u8;
h.as_slice_mut()[31] = j as u8;
encode(&h)
},
}