feat: initial sea128 encrypt is working

src/utils/poly.rs

@@ -1,3 +1,4 @@
+use anyhow::Result;
 use base64::prelude::*;
 use std::{fmt::format, str::FromStr, u128, u8};
 
@@ -19,6 +20,16 @@ pub fn get_alpha_rep(num: u128) -> String {
     alpha_rep
 }
 
+pub fn b64_2_num(string: &String) -> Result<u128> {
+    let decoded: Vec<u8> = BASE64_STANDARD.decode(string)?;
+
+    let mut bytes: [u8; 16] = [0u8; 16];
+    bytes.copy_from_slice(&decoded);
+    let number: u128 = <u128>::from_ne_bytes(bytes);
+
+    Ok(number)
+}
+
 pub fn get_coefficients(num: u128) -> Vec<u8> {
     let mut powers: Vec<u8> = vec![];
     for shift in 0..128 {
@@ -54,6 +65,8 @@ pub fn coefficient_to_binary(coefficients: Vec<u8>) -> u128 {
 
 #[cfg(test)]
 mod tests {
+    use crate::utils::poly::b64_2_num;
+    use anyhow::Result;
     // Note this useful idiom: importing names from outer (for mod tests) scope.
     use super::*;
 
@@ -88,4 +101,17 @@ mod tests {
             "ARIAAAAAAAAAAAAAAAAAgA=="
         );
     }
+
+    #[test]
+    fn test_b64_2_num() -> Result<()> {
+        let b64_payload: String = String::from_str("juMqbhnlBwAAAAAAAAAAAA==")?;
+        assert_eq!(
+            b64_2_num(&b64_payload)?,
+            2222222222222222,
+            "Error: Value was: {}",
+            b64_2_num(&b64_payload)?
+        );
+
+        Ok(())
+    }
 }