A second crack at fixed-sized numbers.

src/cryptonum/addition.rs

@@ -0,0 +1,165 @@
+use cryptonum::{U192,   U256,   U384,   U512,   U576,
+                U1024,  U2048,  U3072,  U4096,  U8192,
+                U15360};
+use cryptonum::comparison::bignum_ge;
+use cryptonum::subtraction::raw_subtraction;
+use std::ops::{Add,AddAssign};
+
+pub fn raw_addition(x: &mut [u64], y: &[u64]) -> u64 {
+    assert_eq!(x.len(), y.len());
+
+    let     xiter = x.iter_mut();
+    let     yiter = y.iter();
+    let mut carry = 0;
+
+    for (x, y) in xiter.zip(yiter) {
+        let bigger = (*x as u128) + (*y as u128) + carry;
+        carry      = bigger >> 64;
+        *x         = bigger as u64;
+    }
+
+    carry as u64
+}
+
+pub trait ModAdd {
+    fn modadd(&mut self, y: &Self, m: &Self);
+}
+
+macro_rules! generate_adders
+{
+    ($name: ident) => {
+        impl AddAssign for $name {
+            fn add_assign(&mut self, rhs: $name) {
+                raw_addition(&mut self.values, &rhs.values);
+            }
+        }
+        impl<'a> AddAssign<&'a $name> for $name {
+            fn add_assign(&mut self, rhs: &$name) {
+                raw_addition(&mut self.values, &rhs.values);
+            }
+        }
+        impl Add for $name {
+            type Output = $name;
+
+            fn add(self, other: $name) -> $name {
+                let mut result = $name{ values: self.values };
+                result.add_assign(other);
+                result
+            }
+        }
+        impl<'a> Add<&'a $name> for $name {
+            type Output = $name;
+
+            fn add(self, other: &$name) -> $name {
+                let mut result = $name{ values: self.values };
+                result.add_assign(other);
+                result
+            }
+        }
+        impl<'a,'b> Add<&'a $name> for &'b $name {
+            type Output = $name;
+
+            fn add(self, other: &$name) -> $name {
+                let mut result = $name{ values: self.values };
+                result.add_assign(other);
+                result
+            }
+        }
+        impl ModAdd for $name {
+            fn modadd(&mut self, y: &$name, m: &$name) {
+                let carry = raw_addition(&mut self.values, &y.values);
+                if carry > 0 {
+                    let mut left = Vec::with_capacity(self.values.len() + 1);
+                    for x in self.values.iter() { left.push(*x) }
+                    left.push(carry);
+                    let mut right = Vec::with_capacity(self.values.len() + 1);
+                    for x in m.values.iter() { right.push(*x) }
+                    right.push(0);
+                    raw_subtraction(&mut left, &right);
+                    for i in 0..self.values.len() {
+                        self.values[i] = left[i];
+                    }
+                }
+                if bignum_ge(&self.values, &m.values) {
+                    raw_subtraction(&mut self.values, &m.values);
+                }
+            }
+        }
+    }
+}
+
+generate_adders!(U192);
+generate_adders!(U256);
+generate_adders!(U384);
+generate_adders!(U512);
+generate_adders!(U576);
+generate_adders!(U1024);
+generate_adders!(U2048);
+generate_adders!(U3072);
+generate_adders!(U4096);
+generate_adders!(U8192);
+generate_adders!(U15360);
+
+#[cfg(test)]
+use testing::run_test;
+#[cfg(test)]
+use cryptonum::Decoder;
+
+macro_rules! generate_tests {
+    ($name: ident, $testname: ident, $modtestname: ident) => (
+        #[cfg(test)]
+        #[test]
+        #[allow(non_snake_case)]
+        fn $testname() {
+            let fname = format!("tests/math/addition{}.test",
+                                stringify!($name));
+            run_test(fname.to_string(), 3, |case| {
+                let (neg0, abytes) = case.get("a").unwrap();
+                let (neg1, bbytes) = case.get("b").unwrap();
+                let (neg2, cbytes) = case.get("c").unwrap();
+
+                assert!(!neg0 && !neg1 && !neg2);
+                let mut a = $name::from_bytes(abytes);
+                let b = $name::from_bytes(bbytes);
+                let c = $name::from_bytes(cbytes);
+                assert_eq!(&a + &b, c);
+                a += b;
+                assert_eq!(a, c);
+            });
+        }
+
+        #[cfg(test)]
+        #[test]
+        #[allow(non_snake_case)]
+        fn $modtestname() {
+            let fname = format!("tests/math/modadd{}.test",
+                                stringify!($name));
+            run_test(fname.to_string(), 4, |case| {
+                let (neg0, abytes) = case.get("a").unwrap();
+                let (neg1, bbytes) = case.get("b").unwrap();
+                let (neg2, cbytes) = case.get("c").unwrap();
+                let (neg3, mbytes) = case.get("m").unwrap();
+
+                assert!(!neg0 && !neg1 && !neg2 && !neg3);
+                let mut a = $name::from_bytes(abytes);
+                let b = $name::from_bytes(bbytes);
+                let m = $name::from_bytes(mbytes);
+                let c = $name::from_bytes(cbytes);
+                a.modadd(&b, &m);
+                assert_eq!(a, c);
+            });
+        }
+    )
+}
+
+generate_tests!(U192,u192,modU192);
+generate_tests!(U256,u256,modU256);
+generate_tests!(U384,u384,modU384);
+generate_tests!(U512,u512,modU512);
+generate_tests!(U576,u576,modU576);
+generate_tests!(U1024,u1024,modU1024);
+generate_tests!(U2048,u2048,modU2048);
+generate_tests!(U3072,u3072,modU3072);
+generate_tests!(U4096,u4096,modU4096);
+generate_tests!(U8192,u8192,modU8192);
+generate_tests!(U15360,u15360,modU15360);

src/cryptonum/basetypes.rs

@@ -0,0 +1,170 @@
+use std::fmt;
+use std::fmt::Write;
+
+macro_rules! generate_unsigned
+{
+    ($name: ident, $size: expr) => {
+        pub struct $name {
+            pub(crate) values: [u64; $size/64]
+        }
+
+        impl Clone for $name {
+            fn clone(&self) -> $name {
+                let mut result = $name{ values: [0; $size/64] };
+                for (idx,val) in self.values.iter().enumerate() {
+                    result.values[idx] = *val;
+                }
+                result
+            }
+        }
+
+        impl fmt::Debug for $name {
+            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+                write!(f, stringify!($name))?;
+                write!(f, "{{ ")?;
+                for x in self.values.iter() {
+                    write!(f, "{:X} ", *x)?;
+                }
+                write!(f, "}} ")
+            }
+        }
+
+        impl fmt::UpperHex for $name {
+            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+                let mut wrote_something = false;
+                
+                for x in self.values.iter() {
+                    if !wrote_something && (*x == 0) {
+                        continue;
+                    } else {
+                        f.write_char(tochar_upper(x >> 60))?;
+                        f.write_char(tochar_upper(x >> 56))?;
+                        f.write_char(tochar_upper(x >> 52))?;
+                        f.write_char(tochar_upper(x >> 48))?;
+                        f.write_char(tochar_upper(x >> 44))?;
+                        f.write_char(tochar_upper(x >> 40))?;
+                        f.write_char(tochar_upper(x >> 36))?;
+                        f.write_char(tochar_upper(x >> 32))?;
+                        f.write_char(tochar_upper(x >> 28))?;
+                        f.write_char(tochar_upper(x >> 24))?;
+                        f.write_char(tochar_upper(x >> 20))?;
+                        f.write_char(tochar_upper(x >> 16))?;
+                        f.write_char(tochar_upper(x >> 12))?;
+                        f.write_char(tochar_upper(x >>  8))?;
+                        f.write_char(tochar_upper(x >>  4))?;
+                        f.write_char(tochar_upper(x >>  0))?;
+                        wrote_something = true;
+                    }
+                }
+                if !wrote_something {
+                    f.write_char('0')?
+                }
+                Ok(())
+            }
+        }
+
+        impl fmt::LowerHex for $name {
+            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+                let mut wrote_something = false;
+                
+                for x in self.values.iter() {
+                    if !wrote_something && (*x == 0) {
+                        continue;
+                    } else {
+                        f.write_char(tochar_lower(x >> 60))?;
+                        f.write_char(tochar_lower(x >> 56))?;
+                        f.write_char(tochar_lower(x >> 52))?;
+                        f.write_char(tochar_lower(x >> 48))?;
+                        f.write_char(tochar_lower(x >> 44))?;
+                        f.write_char(tochar_lower(x >> 40))?;
+                        f.write_char(tochar_lower(x >> 36))?;
+                        f.write_char(tochar_lower(x >> 32))?;
+                        f.write_char(tochar_lower(x >> 28))?;
+                        f.write_char(tochar_lower(x >> 24))?;
+                        f.write_char(tochar_lower(x >> 20))?;
+                        f.write_char(tochar_lower(x >> 16))?;
+                        f.write_char(tochar_lower(x >> 12))?;
+                        f.write_char(tochar_lower(x >>  8))?;
+                        f.write_char(tochar_lower(x >>  4))?;
+                        f.write_char(tochar_lower(x >>  0))?;
+                        wrote_something = true;
+                    }
+                }
+                if !wrote_something {
+                    f.write_char('0')?
+                }
+                Ok(())
+            }
+        }
+
+        impl $name {
+            pub fn new() -> $name {
+                $name{ values: [0; $size/64 ] }
+            }
+
+            pub fn is_odd(&self) -> bool {
+                (self.values[0] & 1) == 1
+            }
+
+            pub fn is_even(&self) -> bool {
+                (self.values[0] & 1) == 0
+            }
+        }
+    }
+}
+
+generate_unsigned!(U192,     192);
+generate_unsigned!(U256,     256);
+generate_unsigned!(U384,     384);
+generate_unsigned!(U512,     512);
+generate_unsigned!(U576,     576);
+generate_unsigned!(U1024,   1024);
+generate_unsigned!(U2048,   2048);
+generate_unsigned!(U3072,   3072);
+generate_unsigned!(U4096,   4096);
+generate_unsigned!(U8192,   8192);
+generate_unsigned!(U15360, 15360);
+
+fn tochar_upper(x: u64) -> char {
+    match (x as u8) & (0xF as u8) {
+        0x0 => '0',
+        0x1 => '1',
+        0x2 => '2',
+        0x3 => '3',
+        0x4 => '4',
+        0x5 => '5',
+        0x6 => '6',
+        0x7 => '7',
+        0x8 => '8',
+        0x9 => '9',
+        0xA => 'A',
+        0xB => 'B',
+        0xC => 'C',
+        0xD => 'D',
+        0xE => 'E',
+        0xF => 'F',
+        _   => panic!("the world is broken")
+    }
+}
+
+fn tochar_lower(x: u64) -> char {
+    match (x as u8) & (0xF as u8) {
+        0x0 => '0',
+        0x1 => '1',
+        0x2 => '2',
+        0x3 => '3',
+        0x4 => '4',
+        0x5 => '5',
+        0x6 => '6',
+        0x7 => '7',
+        0x8 => '8',
+        0x9 => '9',
+        0xA => 'a',
+        0xB => 'b',
+        0xC => 'c',
+        0xD => 'd',
+        0xE => 'e',
+        0xF => 'f',
+        _   => panic!("the world is broken")
+    }
+}

src/cryptonum/comparison.rs

@@ -0,0 +1,65 @@
+use cryptonum::{U192,   U256,   U384,   U512,   U576,
+                U1024,  U2048,  U3072,  U4096,  U8192,
+                U15360};
+use std::cmp::{Ord,Ordering};
+
+pub fn bignum_cmp(x: &[u64], y: &[u64]) -> Ordering {
+    assert_eq!(x.len(), y.len());
+    let xiter = x.iter().rev();
+    let yiter = y.iter().rev();
+
+    for (x,y) in xiter.zip(yiter) {
+        match x.cmp(&y) {
+            Ordering::Greater => return Ordering::Greater,
+            Ordering::Less    => return Ordering::Less,
+            Ordering::Equal   => continue
+        }
+    }
+    
+    Ordering::Equal
+}
+
+pub fn bignum_ge(x: &[u64], y: &[u64]) -> bool {
+    match bignum_cmp(x,y) {
+        Ordering::Greater => true,
+        Ordering::Less    => false,
+        Ordering::Equal   => true
+    }
+}
+
+macro_rules! generate_compares
+{
+    ($name: ident) => {
+        impl PartialEq for $name {
+            fn eq(&self, other: &$name) -> bool {
+                bignum_cmp(&self.values, &other.values) == Ordering::Equal
+            }
+        }
+
+        impl Eq for $name {}
+
+        impl Ord for $name {
+            fn cmp(&self, other: &$name) -> Ordering {
+                bignum_cmp(&self.values, &other.values)
+            }
+        }
+
+        impl PartialOrd for $name {
+            fn partial_cmp(&self, other: &$name) -> Option<Ordering> {
+                Some(bignum_cmp(&self.values, &other.values))
+            }
+        }
+    }
+}
+
+generate_compares!(U192);
+generate_compares!(U256);
+generate_compares!(U384);
+generate_compares!(U512);
+generate_compares!(U576);
+generate_compares!(U1024);
+generate_compares!(U2048);
+generate_compares!(U3072);
+generate_compares!(U4096);
+generate_compares!(U8192);
+generate_compares!(U15360);

src/cryptonum/conversions.rs

@@ -0,0 +1,152 @@
+use cryptonum::{U192,   U256,   U384,   U512,   U576,
+                U1024,  U2048,  U3072,  U4096,  U8192,
+                U15360};
+
+macro_rules! generate_basetype_froms
+{
+    ($name: ident) => {
+        generate_basetype_from!($name,    u8);
+        generate_basetype_from!($name,   u16);
+        generate_basetype_from!($name,   u32);
+        generate_basetype_from!($name,   u64);
+        generate_basetype_from!($name, usize);
+
+        impl From<u128> for $name {
+            fn from(x: u128) -> $name {
+                let mut base = $name::new();
+                base.values[0] = x as u64;
+                base.values[1] = (x >> 64) as u64;
+                base
+            }
+        }
+
+    }
+}
+
+macro_rules! generate_basetype_from
+{
+    ($name: ident, $basetype: ident) => {
+        impl From<$basetype> for $name {
+            fn from(x: $basetype) -> $name {
+                let mut base = $name::new();
+                base.values[0] = x as u64;
+                base
+            }
+        }
+    }
+}
+
+macro_rules! convert_from_smaller
+{
+    ($name: ident, $smalltype: ident) => {
+        impl From<$smalltype> for $name {
+            fn from(x: $smalltype) -> $name {
+                let mut base = $name::new();
+                for (idx, val) in x.values.iter().enumerate() {
+                    base.values[idx] = *val;
+                }
+                base
+            }
+        }
+    }
+}
+
+macro_rules! convert_from_larger
+{
+    ($name: ident, $bigtype: ident) => {
+        impl From<$bigtype> for $name {
+            fn from(x: $bigtype) -> $name {
+                let mut base = $name::new();
+                for i in 0..base.values.len() {
+                    base.values[i] = x.values[i];
+                }
+                base
+            }
+        }
+    }
+}
+
+macro_rules! convert_bignums
+{
+    ($bigger: ident, $smaller: ident) => {
+        convert_from_smaller!($bigger, $smaller);
+        convert_from_larger!($smaller, $bigger);
+    }
+}
+
+generate_basetype_froms!(U192);
+generate_basetype_froms!(U256);
+generate_basetype_froms!(U384);
+generate_basetype_froms!(U512);
+generate_basetype_froms!(U576);
+generate_basetype_froms!(U1024);
+generate_basetype_froms!(U2048);
+generate_basetype_froms!(U3072);
+generate_basetype_froms!(U4096);
+generate_basetype_froms!(U8192);
+generate_basetype_froms!(U15360);
+
+convert_bignums!(U256,   U192);
+convert_bignums!(U384,   U192);
+convert_bignums!(U512,   U192);
+convert_bignums!(U576,   U192);
+convert_bignums!(U1024,  U192);
+convert_bignums!(U2048,  U192);
+convert_bignums!(U3072,  U192);
+convert_bignums!(U4096,  U192);
+convert_bignums!(U8192,  U192);
+convert_bignums!(U15360, U192);
+
+convert_bignums!(U384,   U256);
+convert_bignums!(U512,   U256);
+convert_bignums!(U576,   U256);
+convert_bignums!(U1024,  U256);
+convert_bignums!(U2048,  U256);
+convert_bignums!(U3072,  U256);
+convert_bignums!(U4096,  U256);
+convert_bignums!(U8192,  U256);
+convert_bignums!(U15360, U256);
+
+convert_bignums!(U512,   U384);
+convert_bignums!(U576,   U384);
+convert_bignums!(U1024,  U384);
+convert_bignums!(U2048,  U384);
+convert_bignums!(U3072,  U384);
+convert_bignums!(U4096,  U384);
+convert_bignums!(U8192,  U384);
+convert_bignums!(U15360, U384);
+
+convert_bignums!(U576,   U512);
+convert_bignums!(U1024,  U512);
+convert_bignums!(U2048,  U512);
+convert_bignums!(U3072,  U512);
+convert_bignums!(U4096,  U512);
+convert_bignums!(U8192,  U512);
+convert_bignums!(U15360, U512);
+
+convert_bignums!(U1024,  U576);
+convert_bignums!(U2048,  U576);
+convert_bignums!(U3072,  U576);
+convert_bignums!(U4096,  U576);
+convert_bignums!(U8192,  U576);
+convert_bignums!(U15360, U576);
+
+convert_bignums!(U2048,  U1024);
+convert_bignums!(U3072,  U1024);
+convert_bignums!(U4096,  U1024);
+convert_bignums!(U8192,  U1024);
+convert_bignums!(U15360, U1024);
+
+convert_bignums!(U3072,  U2048);
+convert_bignums!(U4096,  U2048);
+convert_bignums!(U8192,  U2048);
+convert_bignums!(U15360, U2048);
+
+convert_bignums!(U4096,  U3072);
+convert_bignums!(U8192,  U3072);
+convert_bignums!(U15360, U3072);
+
+convert_bignums!(U8192,  U4096);
+convert_bignums!(U15360, U4096);
+
+convert_bignums!(U15360, U8192);

src/cryptonum/encoding.rs

@@ -0,0 +1,48 @@
+use cryptonum::{U192,   U256,   U384,   U512,   U576,
+                U1024,  U2048,  U3072,  U4096,  U8192,
+                U15360};
+
+pub trait Decoder {
+    fn from_bytes(x: &[u8]) -> Self;
+}
+
+macro_rules! generate_decoder {
+    ($name: ident) => {
+        impl Decoder for $name {
+            fn from_bytes(x: &[u8]) -> $name {
+                let mut res = $name::new();
+                let mut item = 0;
+                let mut shift = 0;
+                let mut idx = 0;
+
+                for v in x.iter().rev() {
+                    item |= (*v as u64) << shift;
+                    shift += 8;
+                    if shift == 64 {
+                        shift = 0;
+                        res.values[idx] = item;
+                        idx += 1;
+                        item = 0;
+                    }
+                }
+                if item != 0 {
+                    res.values[idx] = item;
+                }
+
+                res
+            }
+        }
+    }
+}
+
+generate_decoder!(U192);
+generate_decoder!(U256);
+generate_decoder!(U384);
+generate_decoder!(U512);
+generate_decoder!(U576);
+generate_decoder!(U1024);
+generate_decoder!(U2048);
+generate_decoder!(U3072);
+generate_decoder!(U4096);
+generate_decoder!(U8192);
+generate_decoder!(U15360);

src/cryptonum/mod.rs

@@ -3,22 +3,15 @@
 //! This module is designed to provide large, fixed-width number support for
 //! the rest of the Simple-Crypto libraries. Feel free to use it other places,
 //! of course, but that's its origin.
-mod core;
+//!
+mod addition;
+mod basetypes;
+mod comparison;
 #[macro_use]
-mod builder;
-mod traits;
+mod conversions;
+mod encoding;
+mod multiplication;
+mod subtraction;
 
-use self::core::*;
-use self::traits::*;
-use std::cmp::Ordering;
-use std::fmt::{Debug,Error,Formatter};
-use std::ops::*;
-
-construct_unsigned!(U512,   u512,     8);
-construct_unsigned!(U1024,  u1024,   16);
-construct_unsigned!(U2048,  u2048,   32);
-construct_unsigned!(U3072,  u3072,   48);
-construct_unsigned!(U4096,  u4096,   64);
-construct_unsigned!(U7680,  u7680,  120);
-construct_unsigned!(U8192,  u8192,  128);
-construct_unsigned!(U15360, u15360, 240);
+pub use self::basetypes::*;
+pub use self::encoding::Decoder;

src/cryptonum/multiplication.rs

@@ -0,0 +1,156 @@
+use cryptonum::{U192,   U256,   U384,   U512,   U576,
+                U1024,  U2048,  U3072,  U4096,  U8192,
+                U15360};
+use std::ops::{Mul,MulAssign};
+
+fn raw_multiplication(x: &[u64], y: &[u64], z: &mut [u64])
+{
+    assert_eq!(x.len(), y.len());
+    assert_eq!(x.len() * 2, z.len());
+
+    // clear out the destination array, because we're going to use it as a
+    // temporary
+    for i in 0..z.len() {
+        z[i] = 0;
+    }
+
+    for i in 0..y.len() { // this may legitimately be off by one
+        let mut carry = 0;
+        for j in 0..x.len() { // ditto
+            let old = z[i+j] as u128;
+            let x128 = x[j] as u128;
+            let y128 = y[i] as u128;
+            let uv = old + (x128 * y128) + carry;
+            z[i+j] = uv as u64;
+            carry = uv >> 64;
+        }
+        z[i+x.len()] = carry as u64;
+    }
+}
+
+macro_rules! generate_multipliers
+{
+    ($name: ident, $size: expr) => {
+        impl MulAssign for $name {
+            fn mul_assign(&mut self, rhs: $name) {
+                let mut result = [0; $size/32];
+                raw_multiplication(&self.values, &rhs.values, &mut result);
+                for i in 0..self.values.len() {
+                    self.values[i] = result[i];
+                }
+            }
+        }
+        impl<'a> MulAssign<&'a $name> for $name {
+            fn mul_assign(&mut self, rhs: &$name) {
+                let mut result = [0; $size/32];
+                raw_multiplication(&self.values, &rhs.values, &mut result);
+                for i in 0..self.values.len() {
+                    self.values[i] = result[i];
+                }
+            }
+        }
+        impl Mul for $name {
+            type Output = $name;
+
+            fn mul(self, rhs: $name) -> $name {
+                let mut result = self.clone();
+                result.mul_assign(rhs);
+                result
+            }
+        }
+        impl<'a> Mul<&'a $name> for $name {
+            type Output = $name;
+
+            fn mul(self, rhs: &$name) -> $name {
+                let mut result = self.clone();
+                result.mul_assign(rhs);
+                result
+            }
+        }
+        impl<'a,'b> Mul<&'a $name> for &'b $name {
+            type Output = $name;
+
+            fn mul(self, rhs: &$name) -> $name {
+                let mut result = self.clone();
+                result.mul_assign(rhs);
+                result
+            }
+        }
+    }
+}
+
+generate_multipliers!(U192,     192);
+generate_multipliers!(U256,     256);
+generate_multipliers!(U384,     384);
+generate_multipliers!(U512,     512);
+generate_multipliers!(U576,     576);
+generate_multipliers!(U1024,   1024);
+generate_multipliers!(U2048,   2048);
+generate_multipliers!(U3072,   3072);
+generate_multipliers!(U4096,   4096);
+generate_multipliers!(U8192,   8192);
+generate_multipliers!(U15360, 15360);
+
+#[cfg(test)]
+use cryptonum::Decoder;
+#[cfg(test)]
+use testing::run_test;
+
+macro_rules! generate_tests {
+    ($name: ident, $testname: ident) => (
+        #[test]
+        #[allow(non_snake_case)]
+        fn $testname() {
+            let fname = format!("tests/math/multiplication{}.test",
+                                stringify!($name));
+            run_test(fname.to_string(), 3, |case| {
+                let (neg0, abytes) = case.get("a").unwrap();
+                let (neg1, bbytes) = case.get("b").unwrap();
+                let (neg2, cbytes) = case.get("c").unwrap();
+
+                assert!(!neg0 && !neg1 && !neg2);
+                let mut a = $name::from_bytes(abytes);
+                let b = $name::from_bytes(bbytes);
+                let c = $name::from_bytes(cbytes);
+                assert_eq!(&a * &b, c);
+                a *= b;
+                assert_eq!(a, c);
+            });
+        }
+    );
+
+    ($name: ident, $testname: ident, $dblname: ident, $doubletest: ident) => (
+        generate_tests!($name, $testname);
+        #[test]
+        #[allow(non_snake_case)]
+        fn $doubletest() {
+            let fname = format!("tests/math/expandingmul{}.test",
+                                stringify!($name));
+            run_test(fname.to_string(), 3, |case| {
+                let (neg0, abytes) = case.get("a").unwrap();
+                let (neg1, bbytes) = case.get("b").unwrap();
+                let (neg2, cbytes) = case.get("c").unwrap();
+
+                assert!(!neg0 && !neg1 && !neg2);
+                let a = $name::from_bytes(abytes);
+                let b = $name::from_bytes(bbytes);
+                let c = $dblname::from_bytes(cbytes);
+                let mut r = $dblname::new();
+                raw_multiplication(&a.values, &b.values, &mut r.values);
+                assert_eq!(c, r);
+            });
+        }
+    )
+}
+
+generate_tests!(U192,u192,U384,expandingU384);
+generate_tests!(U256,u256,U512,expandingU512);
+generate_tests!(U384,u384);
+generate_tests!(U512,u512,U1024,expandingU1024);
+generate_tests!(U576,u576);
+generate_tests!(U1024,u1024,U2048,expandingU2048);
+generate_tests!(U2048,u2048,U4096,expandingU4096);
+generate_tests!(U3072,u3072);
+generate_tests!(U4096,u4096,U8192,expandingU8192);
+generate_tests!(U8192,u8192);
+generate_tests!(U15360,u15360);

src/cryptonum/subtraction.rs

@@ -0,0 +1,121 @@
+use cryptonum::{U192,   U256,   U384,   U512,   U576,
+                U1024,  U2048,  U3072,  U4096,  U8192,
+                U15360};
+use cryptonum::addition::raw_addition;
+use std::ops::{Sub,SubAssign};
+
+pub fn raw_subtraction(x: &mut [u64], y: &[u64])
+{
+    assert_eq!(x.len(), y.len());
+
+    let mut negatedy = Vec::with_capacity(y.len());
+    for val in y.iter() {
+        negatedy.push(!*val);
+    }
+
+    let mut one = Vec::with_capacity(y.len());
+    one.resize(y.len(), 0);
+    one[0] = 1;
+
+    raw_addition(&mut negatedy, &one);
+    raw_addition(x, &negatedy);
+} 
+
+macro_rules! generate_subbers
+{
+    ($name: ident) => {
+        impl SubAssign for $name {
+            fn sub_assign(&mut self, rhs: $name) {
+                raw_subtraction(&mut self.values, &rhs.values);
+            }
+        }
+        impl<'a> SubAssign<&'a $name> for $name {
+            fn sub_assign(&mut self, rhs: &$name) {
+                raw_subtraction(&mut self.values, &rhs.values);
+            }
+        }
+        impl Sub for $name {
+            type Output = $name;
+
+            fn sub(self, rhs: $name) -> $name {
+                let mut result = $name{ values: self.values };
+                raw_subtraction(&mut result.values, &rhs.values);
+                result
+            }
+        }
+        impl<'a> Sub<&'a $name> for $name {
+            type Output = $name;
+
+            fn sub(self, rhs: &$name) -> $name {
+                let mut result = $name{ values: self.values };
+                raw_subtraction(&mut result.values, &rhs.values);
+                result
+            }
+        }
+        impl<'a,'b> Sub<&'a $name> for &'b $name {
+            type Output = $name;
+
+            fn sub(self, rhs: &$name) -> $name {
+                let mut result = (*self).clone();
+                raw_subtraction(&mut result.values, &rhs.values);
+                result
+            }
+        }
+    }
+}
+
+generate_subbers!(U192);
+generate_subbers!(U256);
+generate_subbers!(U384);
+generate_subbers!(U512);
+generate_subbers!(U576);
+generate_subbers!(U1024);
+generate_subbers!(U2048);
+generate_subbers!(U3072);
+generate_subbers!(U4096);
+generate_subbers!(U8192);
+generate_subbers!(U15360);
+
+#[cfg(test)]
+use testing::run_test;
+#[cfg(test)]
+use cryptonum::Decoder;
+
+macro_rules! generate_tests {
+    ($name: ident, $testname: ident) => (
+        #[cfg(test)]
+        #[test]
+        #[allow(non_snake_case)]
+        fn $testname() {
+            let fname = format!("tests/math/subtraction{}.test",
+                                stringify!($name));
+            println!("FOO!");
+            run_test(fname.to_string(), 3, |case| {
+                let (neg0, abytes) = case.get("a").unwrap();
+                let (neg1, bbytes) = case.get("b").unwrap();
+                let (neg2, cbytes) = case.get("c").unwrap();
+
+                assert!(!neg0 && !neg1 && !neg2);
+                let mut a = $name::from_bytes(abytes);
+                let b = $name::from_bytes(bbytes);
+                let c = $name::from_bytes(cbytes);
+                let r = &a - &b;
+                assert_eq!(r, c);
+                a -= b;
+                assert_eq!(a, c);
+            });
+        }
+    )
+}
+
+generate_tests!(U192,u192);
+generate_tests!(U256,u256);
+generate_tests!(U384,u384);
+generate_tests!(U512,u512);
+generate_tests!(U576,u576);
+generate_tests!(U1024,u1024);
+generate_tests!(U2048,u2048);
+generate_tests!(U3072,u3072);
+generate_tests!(U4096,u4096);
+generate_tests!(U8192,u8192);
+generate_tests!(U15360,u15360);

src/cryptonum/traits.rs

@@ -1,12 +1,3 @@
-pub trait CryptoNum {
-    /// Simultaneously compute the quotient and remainder of this number and
-    /// the given divisor.
-    fn divmod(&self, a: &Self, q: &mut Self, r: &mut Self);
-    /// Convert a number to a series of bytes, in standard order (most to
-    /// least significant)
-    fn to_bytes(&self) -> Vec<u8>;
-    /// Convert a series of bytes into the number. The size of the given slice
-    /// must be greater than or equal to the size of the number, and must be
-    /// a multiple of 8 bytes long. Unused bytes should be ignored.
-    fn from_bytes(&[u8]) -> Self;
-}
+pub trait FromHex {
+    fn from_hex(s: String) -> Self;
+}

src/lib.rs

@@ -1,4 +1,3 @@
-#![feature(i128_type)]
 //! # Simple Crypto: A quaint little crypto library for rust.
 //!
 //! This is the simple_crypto library. Its goal is to provide straightforward
@@ -11,19 +10,13 @@
 //! when they should use it, and examples. For now, it mostly just fowards
 //! off to more detailed modules. Help requested!
 
-#[cfg(test)]
-#[macro_use]
-extern crate quickcheck;
+//#[cfg(test)]
+//#[macro_use]
+//extern crate quickcheck;
 
 /// The cryptonum module provides support for large numbers at fixed,
 /// cryptographically-relevant sizes.
 pub mod cryptonum;
 
 #[cfg(test)]
-mod test {
-
-    #[test]
-    fn testing_works() {
-        assert!(true);
-    }
-}
+mod testing;

src/testing.rs

@@ -0,0 +1,62 @@
+use std::collections::HashMap;
+use std::fs::File;
+use std::io::Read;
+use std::str::Lines;
+
+fn next_value_set(line: &str) -> (String, bool, Vec<u8>)
+{
+    assert!(line.is_ascii());
+    let mut items = line.split(": ");
+    let key = items.next().unwrap();
+    let valbits = items.next().unwrap();
+    let neg = valbits.contains('-');
+    let valbitsnoneg = valbits.trim_left_matches("-");
+
+    let mut nibble_iter = valbitsnoneg.chars().rev();
+    let mut val = Vec::new();
+
+    while let Some(c1) = nibble_iter.next() {
+        match nibble_iter.next() {
+            None => {
+                val.push( c1.to_digit(16).unwrap() as u8 );
+            }
+            Some(c2) => {
+                let b1 = c1.to_digit(16).unwrap() as u8;
+                let b2 = c2.to_digit(16).unwrap() as u8;
+                val.push( (b2 << 4) | b1 );
+            }
+        }
+    }
+    val.reverse();
+
+    (key.to_string(), neg, val)
+}
+
+fn next_test_case(contents: &mut Lines, lines: usize) ->
+    Option<HashMap<String,(bool,Vec<u8>)>>
+{
+    let mut res = HashMap::new();
+    let mut count = 0;
+
+    while count < lines {
+        let line = contents.next()?;
+        let (key, neg, val) = next_value_set(line);
+        res.insert(key, (neg,val));
+        count += 1;
+    }
+
+    Some(res)
+}
+
+pub fn run_test<F>(fname: String, i: usize, f: F)
+ where F: Fn(HashMap<String,(bool,Vec<u8>)>)
+{
+    let mut file = File::open(fname).unwrap();
+    let mut contents = String::new();
+    file.read_to_string(&mut contents).unwrap();
+    let mut iter = contents.lines();
+
+    while let Some(scase) = next_test_case(&mut iter, i) {
+        f(scase);
+    }
+}