works

Cargo.toml

@@ -13,3 +13,5 @@ sha2 = "0.9"
 malloc-array = "1.3.3"
 libc = "0.2"
 crc = "1.8"
+hex-literal = "0.2"
+getrandom = "0.1"

src/error.rs

@@ -10,6 +10,7 @@ pub enum Error
     IO(io::Error),
     Format(fmt::Error),
     Length{expected: usize, got:usize,},
+    RNG(getrandom::Error),
     Unknown,
 }
 
@@ -20,6 +21,7 @@ impl error::Error for Error
 	match &self {
 	    Error::IO(e_io) => Some(e_io),
 	    Error::Format(e_fmt) => Some(e_fmt),
+	    Error::RNG(e_rng) => Some(e_rng),
 	    _ => None,
 	}
     }
@@ -34,6 +36,7 @@ impl fmt::Display for Error
 	    Error::IO(io) => write!(f, "io: {}", io),
 	    Error::Format(fmt) => write!(f, "fmt: {}", fmt),
 	    Error::Length{expected, got} => write!(f, "invalid length: expected {}, got {}", expected, got),
+	    Error::RNG(rng) => write!(f, "rng error: {}", rng),
 	    _ => write!(f, "unknown failure"),
 	}
     }
@@ -47,6 +50,7 @@ impl From<Error> for i32
 	    Error::IO(_) => 1,
 	    Error::Format(_) => 2,
 	    Error::Length{..} => 3,
+	    Error::RNG(_) => 4,
 	    _ => -1,
 	}
     }
@@ -66,3 +70,11 @@ impl From<fmt::Error> for Error
 	Self::Format(i)
     }
 }
+
+impl From<getrandom::Error> for Error
+{
+    fn from(rng: getrandom::Error) -> Self
+    {
+	Self::RNG(rng)
+    }
+}

src/ext.rs

@@ -0,0 +1,26 @@
+use crate::*;
+
+pub trait HeapArrayExt: Sized
+{
+    fn into_unsafe(self) -> Self;
+    fn into_safe(self) -> Self;
+    fn set_unsafe(self, un: bool) -> Self;
+}
+impl<T> HeapArrayExt for HeapArray<T>
+{
+    fn into_unsafe(mut self) -> Self
+    {
+	self.drop_check = false;
+	self
+    }
+    fn into_safe(mut self) -> Self
+    {
+	self.drop_check = true;
+	self
+    }
+    fn set_unsafe(mut self, un: bool) -> Self
+    {
+	self.drop_check = un;
+	self
+    }
+}

src/hash/crc32.rs

@@ -13,7 +13,7 @@ impl provider::ByteProvider for Crc32Checksum
 	unsafe{reinterpret::bytes(&self.hash)}
     }
     
-    fn compute<T: Read + ?Sized>(input: &mut T, done: &mut usize) -> Result<Self, error::Error>
+    fn compute<T: Read + ?Sized>(input: &mut T, salt: &salt::Salt, done: &mut usize) -> Result<Self, error::Error>
     {
 	let mut buffer = [0u8; BUFFER_SIZE];
 	let mut hasher = crc32::Digest::new(crc32::IEEE);
@@ -23,6 +23,7 @@ impl provider::ByteProvider for Crc32Checksum
 	    hasher.write(&buffer[..read]);
 	    *done += read;
 	}
+	hasher.write(salt.bytes());
 	Ok(Self{hash: hasher.sum32()})
     }
 }

src/hash/crc64.rs

@@ -13,7 +13,7 @@ impl provider::ByteProvider for Crc64Checksum
 	unsafe{reinterpret::bytes(&self.hash)}
     }
     
-    fn compute<T: Read + ?Sized>(input: &mut T, done: &mut usize) -> Result<Self, error::Error>
+    fn compute<T: Read + ?Sized>(input: &mut T, salt: &salt::Salt, done: &mut usize) -> Result<Self, error::Error>
     {
 	let mut buffer = [0u8; BUFFER_SIZE];
 	let mut hasher = crc64::Digest::new(crc64::ECMA);
@@ -23,6 +23,7 @@ impl provider::ByteProvider for Crc64Checksum
 	    hasher.write(&buffer[..read]);
 	    *done += read;
 	}
+	hasher.write(salt.bytes());
 	Ok(Self{hash: hasher.sum64()})
     }
 }

src/hash/sha256.rs

@@ -34,13 +34,14 @@ fn compute_stream<T: Read +?Sized, D: Digest>(input: &mut T, output: &mut D) ->
 impl Sha256Hash
 {
     /// Compute a hash from a stream.
-    pub fn compute<T: Read + ?Sized>(input: &mut T) -> io::Result<(usize, Self)>
+    pub fn compute<T: Read + ?Sized>(input: &mut T, salt: &salt::Salt) -> io::Result<(usize, Self)>
     {
 	let mut hash = [0u8; SHA256_SIZE];
 
 	let mut hasher = Sha256::new();
 
 	let ok = compute_stream(input, &mut hasher)?;
+	hasher.update(salt.bytes());
 
 	assert_eq!(array::copy_slice(&mut hash, hasher.finalize()), SHA256_SIZE);
 	Ok((ok, Self{hash}))
@@ -74,9 +75,9 @@ impl provider::ByteProvider for hash::Sha256Hash
 	&self.bytes()[..]
     }
     
-    fn compute<T: Read + ?Sized>(input: &mut T, done: &mut usize) -> Result<Self, error::Error>
+    fn compute<T: Read + ?Sized>(input: &mut T, salt: &salt::Salt, done: &mut usize) -> Result<Self, error::Error>
     {
-	let (ok, this) = Self::compute(input)?;
+	let (ok, this) = Self::compute(input, salt)?;
 	*done = ok;
 	Ok(this)
     }

src/lib.rs

@@ -1,3 +1,4 @@
+//#![feature(const_generics)]
 #![allow(dead_code)]
 use std::{
     io::{
@@ -14,10 +15,36 @@ mod tests {
     #[test]
     fn it_works() -> Result<(), error::Error>
     {
-	let input = b"hello world!!";
+	let input = b"lolis are super ultra mega cute";
-	let kana = generate(input)?;
+	let kana = generate(input, salt::Salt::default())?;
 	println!("kana: {}", kana);
-	panic!("uhh")
+	assert_eq!(kana, "ワイトひはっトと");
+	Ok(())
+    }
+    #[test]
+    fn ffi() -> Result<(), Box<dyn std::error::Error>>
+    {
+	unsafe {
+	    unsafe fn work_with_salt(salt: salt::Salt) -> Result<String, error::Error> {
+		let input = b"lolis are super ultra mega cute";
+		let salt = salt::into_raw(salt);
+		
+		// Simulate ffi call;
+		let mut sz: libc::size_t = 0;
+		assert_eq!(GENERIC_SUCCESS, _kana_length(&input[0] as *const u8 as *const libc::c_void, input.len(), salt as *const libc::c_void, &mut sz as *mut size_t));
+		assert_eq!(sz, 24);
+
+		let mut output = malloc_array::heap![unsafe u8; sz];
+		assert_eq!(GENERIC_SUCCESS, _kana_do(&input[0] as *const u8 as *const libc::c_void, input.len(), salt as *mut libc::c_void, output.as_ptr_mut() as *mut libc::c_char, sz));
+
+		let string = std::str::from_utf8(&output[..]).unwrap();
+		Ok(string.to_owned())
+	    }
+
+	    assert_eq!("けほほぇほょすゆ", work_with_salt(salt::Salt::None)?);
+	    assert_eq!("ワイトひはっトと", work_with_salt(salt::Salt::default())?);
+	}
+	Ok(())
     }
 }
 
@@ -25,11 +52,14 @@ pub const BUFFER_SIZE: usize = 4096;
 
 mod array;
 mod reinterpret;
-mod group;
+mod ext;
+use ext::*;
+mod group; //unused
 mod sixteen;
 use sixteen::Bit16IterExt;
 mod def;
 mod map;
+mod salt;
 mod hash;
 mod provider;
 mod mnemonic;
@@ -39,9 +69,9 @@ mod error;
 mod ffi;
 use ffi::*;
 
-fn compute<T: Read, Digest: provider::ByteProvider>(mut from: T) -> Result<(usize, String), error::Error>
+fn compute<T: Read, Digest: provider::ByteProvider>(mut from: T, salt: salt::Salt) -> Result<(usize, String), error::Error>
 {
-    let (read, hash) = provider::compute::<_, Digest>(&mut from)?;
+    let (read, hash) = provider::compute::<_, Digest>(&mut from, salt)?;
 
     println!("hash ({}): {}", read, hash);
     let mut output = String::with_capacity(128);
@@ -55,11 +85,11 @@ fn compute<T: Read, Digest: provider::ByteProvider>(mut from: T) -> Result<(usiz
     Ok((read,output))
 }
 
-pub fn generate<T: AsRef<[u8]>>(bytes: T) -> Result<String, error::Error>
+pub fn generate<T: AsRef<[u8]>>(bytes: T, salt: salt::Salt) -> Result<String, error::Error>
 {
     let bytes = bytes.as_ref();
     let mut nbytes = bytes;
-    let (ok, string) = compute::<_, HASHER>(&mut nbytes)?;
+    let (ok, string) = compute::<_, HASHER>(&mut nbytes,salt)?;
     if ok == bytes.len() {
 	Ok(string)
     } else {
@@ -77,28 +107,69 @@ use malloc_array::{
     HeapArray,
 };
 
+// FFI section
+
+/// Calculate the length in bytes of a kana hash output.
+///
+/// # Note
+/// Does not consume `salt`
 #[no_mangle]
-pub unsafe extern "C" fn _kana_length(bin: *const c_void, sz: size_t, out_len: *mut size_t) -> i32
+pub unsafe extern "C" fn _kana_length(bin: *const c_void, sz: size_t, salt: *const c_void, out_len: *mut size_t) -> i32
 {
     no_unwind!{
 	try error::Error::Unknown;
 	let bin = HeapArray::<u8>::from_raw_copied(bin as *const u8, usize::from(sz));
-	let string = c_try!(generate(&bin));
+	let string = c_try!(generate(&bin, salt::clone_from_raw(salt as *const salt::FFI)));
-	*out_len = (string.bytes().len()+1).into();
+	*out_len = string.bytes().len().into();
 
 	GENERIC_SUCCESS
     }
 }
+
+/// Compute and write a kana hash output to a string.
+///
+/// # Note
+/// Consumes `salt`
 #[no_mangle]
-pub unsafe extern "C" fn _kana_do(bin: *const c_void, sz: size_t, out_str: *mut c_char, str_len: size_t) -> i32
+pub unsafe extern "C" fn _kana_do(bin: *const c_void, sz: size_t, salt: *mut c_void, out_str: *mut c_char, str_len: size_t) -> i32
 {
     no_unwind!{
 	try error::Error::Unknown;
 	let bin = HeapArray::<u8>::from_raw_copied(bin as *const u8, usize::from(sz));
-	let string: Vec<u8> = c_try!(generate(&bin)).bytes().collect();
+	let string: Vec<u8> = c_try!(generate(&bin, salt::from_raw(salt as *mut salt::FFI))).bytes().collect();
 	
 	libc::memcpy(out_str as *mut c_void, &string[0] as *const u8 as *const c_void, std::cmp::min(str_len, string.len()));
 	
 	GENERIC_SUCCESS
     }
 }
+
+/// Free a salt allocated with `_kana_new_salt`
+#[no_mangle]
+pub unsafe extern "C" fn _kana_free_salt(salt: *mut c_void) -> i32
+{
+    no_unwind!{
+	drop(salt::from_raw(salt as *mut salt::FFI));
+	GENERIC_SUCCESS
+    }
+}
+
+/// Create a new salt
+#[no_mangle]
+pub unsafe extern "C" fn _kana_new_salt(bin: *const c_void, sz: size_t, nptr: *mut *const c_void) -> i32
+{
+    no_unwind!{
+	try error::Error::Unknown;
+	let nptr = nptr as *mut *const salt::FFI;
+	if bin.is_null() {
+	    *nptr = salt::into_raw(salt::Salt::default());
+	} else if sz == 0 {
+	    *nptr = salt::into_raw(salt::Salt::None);
+	} else {
+	    let bin = HeapArray::<u8>::from_raw_copied(bin as *const u8, usize::from(sz));
+	    *nptr = salt::into_raw(salt::Salt::unfixed(&bin[..]));
+	}
+
+	GENERIC_SUCCESS
+    }
+}

src/mnemonic.rs

@@ -21,12 +21,13 @@ impl Digest {
 	d.0 = Some(map::KANA[master]);
 	if from[1] > 0 {
 	    if let Some(slaves) = map::sub(master) {
-		if slaves.len() > 0 {
+		let one = (usize::from(from[1]) / map::KANA.len()) % 2;
+		if slaves.len() > 0 && one > 0{
 		    d.1 = Some(slaves[usize::from(from[1]) % slaves.len()]);
 		    return d;
 		}
 	    }
-	    let from = [from[1]];
+	    let from = [from[1], 0];
 	    d.1 = Self::new(&from[..]).0;
 	}
 	d

src/provider.rs

@@ -2,14 +2,14 @@ use crate::*;
 
 pub trait ByteProvider: Sized + std::fmt::Display
 {
-    fn compute<T: Read + ?Sized>(input: &mut T, provided: &mut usize) -> Result<Self, error::Error>;
+    fn compute<T: Read + ?Sized>(input: &mut T, salt: &salt::Salt, provided: &mut usize) -> Result<Self, error::Error>;
     fn bytes(&self) -> &[u8];
 }
 
 
-pub fn compute<T: Read + ?Sized, P: ByteProvider>(input: &mut T) -> Result<(usize, P), error::Error>
+pub fn compute<T: Read + ?Sized, P: ByteProvider>(input: &mut T, salt: salt::Salt) -> Result<(usize, P), error::Error>
 {
     let mut output = 0usize;
-    let this = P::compute(input, &mut output)?;
+    let this = P::compute(input, &salt, &mut output)?;
     Ok((output, this))
 }

src/salt.rs

@@ -0,0 +1,150 @@
+use crate::*;
+use malloc_array::*;
+use getrandom::{
+    getrandom,
+    Error,
+};
+use hex_literal::hex;
+
+use std::{
+    io::{
+	self,
+	Write,
+    },
+};
+
+pub const SIZE: usize = 32;
+
+const STATIC_SALT: &[u8; SIZE] = &hex!("6787f049791466d5a31a3aa6f7138d8fbb907fd1785758298b5c97b0f3fb31ff");
+
+#[derive(Clone,PartialEq,Eq,Hash,Debug)]
+pub enum Salt
+{
+    None,
+    Static(&'static [u8; SIZE]),
+    Fixed([u8; SIZE]),
+    Dynamic(Box<[u8]>),
+}
+
+impl Default for Salt
+{
+    fn default() -> Self
+    {
+	Self::Static(STATIC_SALT)
+    }
+}
+
+impl Salt
+{
+    pub fn fixed(array: [u8; SIZE]) -> Self
+    {
+	Self::Fixed(array)
+    }
+    pub fn unfixed<T>(slice: &T) -> Self
+    where T: AsRef<[u8]> + ?Sized
+    {
+	let slice = slice.as_ref();
+	assert!(slice.len() > 0, "Salt expects at least one byte.");
+	Self::Dynamic(Vec::from(slice).into_boxed_slice())
+    }
+    pub fn none() -> Self
+    {
+	Self::None
+    }
+    pub fn random() -> Result<Self, Error>
+    {
+	let mut buffer = [0u8; SIZE];
+	getrandom(&mut buffer[..])?;
+	Ok(Self::Fixed(buffer))
+    }
+    pub const fn internal() -> Self
+    {
+	Self::Static(STATIC_SALT)
+    }
+
+    pub fn bytes(&self) -> &[u8]
+    {
+	match &self {
+	    Self::Fixed(ar) => &ar[..],
+	    Self::Dynamic(vec) => &vec[..],
+	    Self::Static(s) => &s[..],
+	    _ => &[],
+	}
+    }
+
+    /// Append salt bytes to a stream.
+    pub fn append<W: Write+?Sized>(&self, to: &mut W) -> io::Result<usize>
+    {
+	to.write(self.bytes())
+    }
+}
+
+#[derive(Copy,Clone,Debug)]
+#[repr(C)]
+#[repr(packed)]
+pub struct FFI
+{
+    size: usize,
+    body: *mut u8,
+}
+
+/// We won't try to copy more than this much data.
+const MAX_FFI_SALT_SIZE: usize = 1024;
+/// Clone a new `Salt` from an `FFI` salt.
+pub unsafe fn clone_from_raw(ptr: *const FFI) -> Salt
+{
+    if ptr.is_null() {
+	Salt::default()
+    } else {
+	let ptr = &*ptr;
+	if ptr.size == 0 || ptr.body.is_null() {
+	    return Salt::None;
+	}
+	let size = std::cmp::min(ptr.size, MAX_FFI_SALT_SIZE);
+	Salt::Dynamic(HeapArray::from_raw_copied(ptr.body, size).into_unsafe().into_boxed_slice())
+    }
+}
+/// Consume an `FFI` salt and return a `Salt`.
+pub unsafe fn from_raw(ptr: *mut FFI) -> Salt
+{
+    if ptr.is_null() {
+	Salt::default()
+    } else {
+	let ptr = {
+	    let mut ptr = HeapArray::from_raw_parts(ptr, 1);
+	    let rval = ptr[0].clone();
+	    ptr.set_memory(0);
+	    rval
+	};
+	if ptr.size == 0 || ptr.body.is_null() {
+	    return Salt::None;
+	}
+	let body = HeapArray::from_raw_parts(ptr.body, ptr.size);
+	Salt::Dynamic(body.into_boxed_slice())
+    }
+}
+
+/// Consume a `Salt` and output a newly allocated `FFI` salt.
+pub unsafe fn into_raw(salt: Salt) -> *mut FFI
+{
+    unsafe fn genffi(bytes: &[u8]) -> *mut FFI
+    {
+	if bytes.len() == 0 {
+	    let (ffi, _) = heap![FFI{size:0,body:0 as *mut u8}].into_raw_parts();
+	    ffi
+	} else {
+	    let mut array = heap![unsafe u8; bytes.len()];
+	    array.memory_from_raw(&bytes[0] as *const u8, bytes.len());
+	    let (body, size) = array.into_raw_parts();
+	    let (ffi, _) = heap![FFI{size,body}].into_raw_parts();
+	    ffi
+	}
+    }
+    match salt {
+	Salt::Static(STATIC_SALT) => 0 as *mut FFI,
+	Salt::Static(&other) | Salt::Fixed(other) => genffi(&other[..]),
+	Salt::Dynamic(other) => genffi(&other[..]),
+	_ => genffi(salt.bytes()),
+    }
+}
+