Create project

.gitignore

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+.idea/
+target

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Cargo.toml

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+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+
+[dependencies]
+rand_os = "*"
+# x25519-dalek = "0.6.0"
+# ed25519-dalek = { version = "1.0", features = ["serde"] }
+sha2 = "0.8.1"
+rand = "*"
+serde = { version = "1.0", features = ["derive", "alloc"], default-features = false }

src/crypto.rs

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+extern crate rand;
+
+use crate::ed25519_dalek::ed25519::signature::Signature;
+use crate::ed25519_dalek::Signer;
+use crate::ed25519_dalek::Verifier;
+use alloc::vec::Vec;
+use ed25519_dalek::{Keypair, PublicKey as PK};
+use rand::rngs::OsRng;
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
+pub struct PublicKey {
+    pub key: [u8; 32],
+}
+
+impl PublicKey {
+    pub fn verify_sign(&self, raw: &Vec<u8>, sign: &Vec<u8>) -> bool {
+        PK::from_bytes(&self.key)
+            .unwrap()
+            .verify(
+                raw,
+                &Signature::from_bytes(sign.clone().into_boxed_slice().as_ref()).unwrap(),
+            )
+            .is_ok()
+    }
+}
+
+pub struct Keys {
+    pub pair: Keypair,
+}
+
+impl Keys {
+    pub fn gen() -> Keys {
+        Keys {
+            pair: Keypair::generate(&mut OsRng {}),
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
+pub enum Sign {
+    NoSign,
+    Signed(PublicKey /* source */, Vec<u8> /* sign */),
+}
+
+pub fn verify_sign(data: &Vec<u8>, sign: &Sign) -> bool {
+    match sign {
+        Sign::NoSign => true,
+        Sign::Signed(key, sign) => key.verify_sign(data, sign),
+    }
+}
+
+impl Keys {
+    pub fn sign(&self, content: &Vec<u8>) -> Vec<u8> {
+        self.pair.sign(content.as_ref()).to_bytes().to_vec()
+    }
+
+    pub fn get_public(&self) -> PublicKey {
+        PublicKey {
+            key: *self.clone().pair.public.as_bytes(),
+        }
+    }
+}

src/lib.rs

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+#![allow(dead_code)]
+
+extern crate alloc;
+extern crate rand;
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}