initial commit

4 years ago · 0abd878df2
commit 0abd878df2
5 changed files with 307 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,2 @@
+/target
+*~
--- a/Cargo.lock
+++ b/Cargo.lock
@ -0,0 +1,132 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "autocfg"
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+
+[[package]]
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+dependencies = [
+ "base64",
+ "getrandom",
+ "hex-literal",
+ "openssl",
+]
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+ "bitflags",
+ "cfg-if",
+ "foreign-types",
+ "libc",
+ "once_cell",
+ "openssl-sys",
+]
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+ "pkg-config",
+ "vcpkg",
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--- a/Cargo.toml
+++ b/Cargo.toml
@ -0,0 +1,13 @@
+[package]
+name = "chachaex"
+version = "0.1.0"
+authors = ["Avril <flanchan@cumallover.me>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+base64 = "0.13.0"
+getrandom = "0.2.2"
+hex-literal = "0.3.1"
+openssl = "0.10.32"
--- a/src/cha.rs
+++ b/src/cha.rs
@ -0,0 +1,112 @@
+
+use getrandom::getrandom;
+use openssl::{
+    symm::{
+	Cipher, Crypter, Mode,
+    },
+    error::ErrorStack,
+};
+
+pub const KEY_SIZE: usize = 32;
+pub const IV_SIZE: usize = 12;
+
+static NEW_CIPHER: fn() -> Cipher = Cipher::chacha20_poly1305;
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash, Copy)]
+#[repr(transparent)]
+pub struct Key([u8; KEY_SIZE]);
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash, Copy)]
+#[repr(transparent)]
+pub struct IV([u8; IV_SIZE]);
+
+#[inline] pub fn decrypter(key: impl AsRef<Key>, iv: impl AsRef<IV>) -> Result<Crypter, ErrorStack>
+{
+    Crypter::new(
+	NEW_CIPHER(),
+	Mode::Decrypt,
+	key.as_ref().as_ref(),
+	Some(iv.as_ref().as_ref())
+    )
+}
+#[inline] pub fn encrypter(key: impl AsRef<Key>, iv: impl AsRef<IV>) -> Result<Crypter, ErrorStack>
+{
+    Crypter::new(
+	NEW_CIPHER(),
+	Mode::Encrypt,
+	key.as_ref().as_ref(),
+	Some(iv.as_ref().as_ref())
+    )
+}
+
+impl Key
+{
+    pub fn new() -> Self
+    {
+	let mut output = [0u8; KEY_SIZE];
+	getrandom(&mut output[..]).expect("rng fatal");
+	Self(output)
+    }
+}
+
+impl IV
+{
+    pub fn new() -> Self
+    {
+	let mut output = [0u8; IV_SIZE];
+	getrandom(&mut output[..]).expect("rng fatal");
+	Self(output)
+    }
+}
+
+impl AsRef<[u8]> for Key
+{
+    fn as_ref(&self) -> &[u8]
+    {
+	&self.0[..]
+    }
+}
+impl AsRef<[u8]> for IV
+{
+    fn as_ref(&self) -> &[u8]
+    {
+	&self.0[..]
+    }
+}
+
+impl AsMut<[u8]> for Key
+{
+    fn as_mut(&mut self) -> &mut [u8]
+    {
+	&mut self.0[..]
+    }
+}
+
+impl AsMut<[u8]> for IV
+{
+    fn as_mut(&mut self) -> &mut [u8]
+    {
+	&mut self.0[..]
+    }
+}
+
+#[inline(always)] pub fn keygen() -> (Key, IV)
+{
+    (Key::new(), IV::new())
+}
+
+impl AsRef<Key> for Key
+{
+    #[inline] fn as_ref(&self) -> &Key
+    {
+	self
+    }
+}
+impl AsRef<IV> for IV
+{
+    #[inline] fn as_ref(&self) -> &IV
+    {
+	self
+    }
+}
+
--- a/src/main.rs
+++ b/src/main.rs
@ -0,0 +1,48 @@
+
+#[macro_use] extern crate hex_literal;
+
+mod cha;
+
+use cha::{Key, IV};
+
+fn encrypt((key, iv): &(Key, IV), input: impl Into<Vec<u8>>) -> Result<String, openssl::error::ErrorStack>
+{
+    let input = input.into();//.into();
+    let mut output = vec![0u8; input.len()];
+
+    eprintln!("(enc) Key: {:?}, IV: {:?}, Input: ({}, {:?})", key, iv, input.len(), input);
+    
+    let mut enc = cha::encrypter(key, iv)?;
+
+    let n = enc.update(&input[..], &mut output[..])?;
+    eprintln!("(enc) Written {} bytes", n);
+    enc.finalize(&mut output[..n])?;
+
+    Ok(base64::encode(&output[..n]))
+}
+
+fn decrypt((key, iv): &(Key, IV), input: impl Into<String>) -> Result<Vec<u8>, openssl::error::ErrorStack>
+{
+    let input = base64::decode(input.into()).expect("invalid base64");
+    let mut output = vec![0u8; input.len()];
+
+    eprintln!("(dec) Key: {:?}, IV: {:?}, Input: ({}, {:?})", key, iv, input.len(), input);
+
+    let mut dec = cha::decrypter(key, iv)?;
+
+    let n = dec.update(&input[..], &mut output[..])?;
+    eprintln!("(dec) Written {} bytes", n);
+    dec.finalize(&mut output[..n])?;
+
+    output.truncate(n);
+    Ok(output)
+}
+
+fn main() {
+    let key = cha::keygen();
+    let enc = encrypt(&key, std::env::args().nth(1).unwrap()).expect("encrypt");
+    println!("{}", enc);
+    let dec = decrypt(&key, enc).expect("decrypt");
+
+    println!("{:?}", std::str::from_utf8(&dec[..]).unwrap());
+}