Make crypto_backend public (#28)

src/error.rs

@@ -88,6 +88,9 @@ pub enum ErrorKind {
     #[fail(display = "Could not decode base64 entry")]
     DecodeError,
 
+    #[fail(display = "Crypto backend error")]
+    CryptoError,
+
     #[cfg(feature = "backend-openssl")]
     #[fail(display = "OpenSSL error: {}", _0)]
     OpenSSLError(#[fail(cause)] openssl::error::ErrorStack),

src/lib.rs

@@ -5,7 +5,7 @@
 mod aes128gcm;
 mod aesgcm;
 mod common;
-mod crypto_backend;
+pub mod crypto_backend;
 mod crypto_backends;
 mod error;