From 04b4c79f7a786f241f3691c3475cc173f77cb0b5 Mon Sep 17 00:00:00 2001
From: Adam Wick <awick@uhsure.com>
Date: Fri, 18 Jan 2019 21:55:42 -0800
Subject: [PATCH] Add size querying for ECDSA curves.

---
 src/ecdsa/curve.rs | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/ecdsa/curve.rs b/src/ecdsa/curve.rs
index 7b523ae..b98529a 100644
--- a/src/ecdsa/curve.rs
+++ b/src/ecdsa/curve.rs
@@ -7,6 +7,7 @@ pub trait EllipticCurve {
     type Unsigned : Clone;
     type Signed : Clone;
 
+    fn size() -> usize;
     fn p() -> Self::Unsigned;
     fn n() -> Self::Unsigned;
     fn SEED() -> Self::Unsigned;
@@ -23,6 +24,10 @@ impl EllipticCurve for P192 {
     type Unsigned = U192;
     type Signed = I192;
 
+    fn size() -> usize {
+        192
+    }
+
     fn p() -> U192 {
         U192::from_bytes(&[0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe,
@@ -82,6 +87,10 @@ impl EllipticCurve for P224 {
     type Unsigned = U256;
     type Signed = I256;
 
+    fn size() -> usize {
+        224
+    }
+
     fn p() -> U256 {
         U256::from_bytes(&[
                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
@@ -160,6 +169,10 @@ impl EllipticCurve for P256 {
     type Signed = I256;
     type Unsigned = U256;
 
+    fn size() -> usize {
+        256
+    }
+
     fn p() -> U256 {
         U256::from_bytes(&[
                 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x01,
@@ -239,6 +252,10 @@ impl EllipticCurve for P384 {
     type Signed = I384;
     type Unsigned = U384;
 
+    fn size() -> usize {
+        384
+    }
+
     fn p() -> U384 {
         U384::from_bytes(&[
                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
@@ -331,6 +348,10 @@ impl EllipticCurve for P521 {
     type Signed = I576;
     type Unsigned = U576;
 
+    fn size() -> usize {
+        521
+    }
+
     fn p() -> U576 {
         U576::from_bytes(&[
                 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,