Replace deprecated functions

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

primitives/statement-store/src/ecies.rs

@@ -71,7 +71,7 @@ fn kdf(shared_secret: &[u8]) -> [u8; AES_KEY_LEN] {
 /// Encrypt `plaintext` with the given public x25519 public key. Decryption can be performed with
 /// the matching secret key.
 pub fn encrypt_x25519(pk: &PublicKey, plaintext: &[u8]) -> Result<Vec<u8>, Error> {
-	let ephemeral_sk = x25519_dalek::StaticSecret::new(OsRng);
+	let ephemeral_sk = x25519_dalek::StaticSecret::random_from_rng(OsRng);
 	let ephemeral_pk = x25519_dalek::PublicKey::from(&ephemeral_sk);
 
 	let mut shared_secret = ephemeral_sk.diffie_hellman(pk).to_bytes().to_vec();
@@ -135,7 +135,7 @@ mod test {
 
 	#[test]
 	fn basic_x25519_encryption() {
-		let sk = SecretKey::new(OsRng);
+		let sk = SecretKey::random_from_rng(OsRng);
 		let pk = PublicKey::from(&sk);
 
 		let plain_message = b"An important secret message";
@@ -159,7 +159,7 @@ mod test {
 
 	#[test]
 	fn fails_on_bad_data() {
-		let sk = SecretKey::new(OsRng);
+		let sk = SecretKey::random_from_rng(OsRng);
 		let pk = PublicKey::from(&sk);
 
 		let plain_message = b"An important secret message";