Rename beacon_chain/ -> eth2/

eth2/utils/bls/src/secret_key.rs

@@ -0,0 +1,59 @@
+use bls_aggregates::{DecodeError as BlsDecodeError, SecretKey as RawSecretKey};
+use ssz::{decode_ssz_list, Decodable, DecodeError, Encodable, SszStream};
+
+/// A single BLS signature.
+///
+/// This struct is a wrapper upon a base type and provides helper functions (e.g., SSZ
+/// serialization).
+#[derive(Debug, PartialEq, Clone, Eq)]
+pub struct SecretKey(RawSecretKey);
+
+impl SecretKey {
+    pub fn random() -> Self {
+        SecretKey(RawSecretKey::random())
+    }
+
+    /// Instantiate a SecretKey from existing bytes.
+    ///
+    /// Note: this is _not_ SSZ decoding.
+    pub fn from_bytes(bytes: &[u8]) -> Result<SecretKey, BlsDecodeError> {
+        Ok(SecretKey(RawSecretKey::from_bytes(bytes)?))
+    }
+
+    /// Returns the underlying secret key.
+    pub fn as_raw(&self) -> &RawSecretKey {
+        &self.0
+    }
+}
+
+impl Encodable for SecretKey {
+    fn ssz_append(&self, s: &mut SszStream) {
+        s.append_vec(&self.0.as_bytes());
+    }
+}
+
+impl Decodable for SecretKey {
+    fn ssz_decode(bytes: &[u8], i: usize) -> Result<(Self, usize), DecodeError> {
+        let (sig_bytes, i) = decode_ssz_list(bytes, i)?;
+        let raw_sig = RawSecretKey::from_bytes(&sig_bytes).map_err(|_| DecodeError::TooShort)?;
+        Ok((SecretKey(raw_sig), i))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::super::ssz::ssz_encode;
+    use super::*;
+
+    #[test]
+    pub fn test_ssz_round_trip() {
+        let original =
+            SecretKey::from_bytes("jzjxxgjajfjrmgodszzsgqccmhnyvetcuxobhtynojtpdtbj".as_bytes())
+                .unwrap();
+
+        let bytes = ssz_encode(&original);
+        let (decoded, _) = SecretKey::ssz_decode(&bytes, 0).unwrap();
+
+        assert_eq!(original, decoded);
+    }
+}