From 9f43983660e5fe7678895ab05eb0be19c1714262 Mon Sep 17 00:00:00 2001
From: Hatter Jiang <jht5945@gmail.com>
Date: Tue, 12 May 2020 01:10:22 +0800
Subject: [PATCH] add sample

---
 crypto/Cargo.lock  |  1 +
 crypto/Cargo.toml  |  1 +
 crypto/src/main.rs | 30 +++++++++++++++++++++++++++++-
 3 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/crypto/Cargo.lock b/crypto/Cargo.lock
index f1dc1c8..491eff6 100644
--- a/crypto/Cargo.lock
+++ b/crypto/Cargo.lock
@@ -51,6 +51,7 @@ dependencies = [
  "p256",
  "p384",
  "p521",
+ "sha2",
 ]
 
 [[package]]
diff --git a/crypto/Cargo.toml b/crypto/Cargo.toml
index f632582..6488c90 100644
--- a/crypto/Cargo.toml
+++ b/crypto/Cargo.toml
@@ -15,4 +15,5 @@ k256 = "0.2.0"
 p256 = "0.2.0"
 p384 = "0.1.0"
 p521 = "0.0.0"
+sha2 = "0.8.1"
 
diff --git a/crypto/src/main.rs b/crypto/src/main.rs
index e7a11a9..5a21df6 100644
--- a/crypto/src/main.rs
+++ b/crypto/src/main.rs
@@ -1,3 +1,31 @@
+use sha2::{Sha256, Sha512, Digest};
+
 fn main() {
-    println!("Hello, world!");
+    println!("{}", to_hex(&sha256(b"hello world")));
+    println!("{}", to_hex(&sha512(b"hello world")));
+}
+
+fn sha256(data: &[u8]) -> Vec<u8> {
+    let mut hasher = Sha256::new();
+    hasher.input(data);
+    let result = hasher.result();
+    result[..].to_vec()
+}
+
+fn sha512(data: &[u8]) -> Vec<u8> {
+    let mut hasher = Sha512::new();
+    hasher.input(data);
+    let result = hasher.result();
+    result[..].to_vec()
+}
+
+fn to_hex(bs: &[u8]) -> String {
+    bs.iter().map(|u| {
+        let x = format!("{:x}", u);
+        if x.len() == 1 {
+            "0".to_owned() + &x
+         } else {
+             x
+         }
+    }).collect()
 }