add _vartime suffix; add test of to_decimal_string

Signed-off-by: Andrew Whitehead <[email protected]>

src/decimal.rs

@@ -279,7 +279,7 @@ fn _encode_decimal_limbs(uint: &mut [Limb], buf: &mut [u8]) {
 /// Obtain the decimal representation of an integer as a vector
 /// of ASCII bytes.
 #[cfg(feature = "alloc")]
-pub fn to_decimal_vec<T>(uint: &T) -> Vec<u8>
+pub fn to_decimal_vec_vartime<T>(uint: &T) -> Vec<u8>
 where
     T: AsRef<[Limb]> + AsMut<[Limb]> + Clone,
 {
@@ -296,17 +296,17 @@ where
 
 /// Obtain the decimal representation of an integer as a String.
 #[cfg(feature = "alloc")]
-pub fn to_decimal_string<T>(uint: &T) -> String
+pub fn to_decimal_string_vartime<T>(uint: &T) -> String
 where
     T: AsRef<[Limb]> + AsMut<[Limb]> + Clone,
 {
-    String::from_utf8(to_decimal_vec(uint)).expect("Error converting to utf-8")
+    String::from_utf8(to_decimal_vec_vartime(uint)).expect("Error converting to utf-8")
 }
 
 /// Write the decimal representation of `uint` to a provided buffer,
 /// returning the length of the output. If the output is too large for the
 /// buffer, then zero is returned.
-pub fn write_decimal_bytes<T>(uint: &T, buf: &mut [u8]) -> usize
+pub fn write_decimal_bytes_vartime<T>(uint: &T, buf: &mut [u8]) -> usize
 where
     T: AsRef<[Limb]> + AsMut<[Limb]> + Clone,
 {
@@ -431,7 +431,7 @@ mod tests {
         T: AsRef<[Limb]> + AsMut<[Limb]> + Clone + Debug + FromDecimal + PartialEq,
     {
         let mut buf = [0u8; 2560];
-        let len = write_decimal_bytes(uint, &mut buf);
+        let len = write_decimal_bytes_vartime(uint, &mut buf);
         let des = T::from_decimal_bytes_vartime(&buf[..len]).expect("Error deserializing");
         assert_eq!(&des, uint);
     }
@@ -483,4 +483,15 @@ mod tests {
         let des: AsDecimal<BoxedUint> = bincode::deserialize(&enc).unwrap();
         assert_eq!(des.0, uint);
     }
+
+    #[cfg(feature = "alloc")]
+    #[test]
+    fn to_decimal() {
+        let input = "123456789012345678901234567890";
+        let uint = crate::U128::from_be_hex("000000018ee90ff6c373e0ee4e3f0ad2");
+        let num_string = to_decimal_string_vartime(&uint);
+        assert_eq!(num_string.as_str(), input);
+        let num_vec = to_decimal_vec_vartime(&uint);
+        assert_eq!(num_vec.as_slice(), input.as_bytes());
+    }
 }