refactor: move base64 to shared utils package

um_crypto/utils/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "umc_utils"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+base64 = "0.22.1"

um_crypto/utils/src/base64.rs

@@ -0,0 +1,22 @@
+use base64::engine::{DecodePaddingMode, GeneralPurpose as Base64Engine, GeneralPurposeConfig};
+use base64::{alphabet, DecodeError, Engine};
+
+/// Don't add padding when encoding, and require no padding when decoding.
+pub const ENGINE: Base64Engine = Base64Engine::new(
+    &alphabet::STANDARD,
+    GeneralPurposeConfig::new().with_decode_padding_mode(DecodePaddingMode::Indifferent),
+);
+
+pub fn encode<T>(data: T) -> String
+where
+    T: AsRef<[u8]>,
+{
+    ENGINE.encode(data)
+}
+
+pub fn decode<T>(data: T) -> Result<Vec<u8>, DecodeError>
+where
+    T: AsRef<[u8]>,
+{
+    ENGINE.decode(data)
+}

um_crypto/utils/src/lib.rs

@@ -0,0 +1 @@
+pub mod base64;