Extract encrypted payload

src/asn_parsing.rs

@@ -11,7 +11,7 @@ pub struct SCEPRequest {
 
 #[derive(Debug, Default)]
 pub struct SCEPResponse {
-
+    encrypted_data_len: usize,
 }
 
 /// Parse asn1 content
@@ -103,7 +103,33 @@ pub fn decode_response(openssl: &str, res: &[u8]) -> anyhow::Result<SCEPResponse
     let pkcs7_data = hex::decode(byte_string.trim()).context("Decode PKCS7")?;
 
     let pkcs7_decoded = parse_asn1(openssl, &pkcs7_data)?;
-    println!("{}", pkcs7_decoded);
+    log::debug!("PKCS7 decoded data: {}", pkcs7_decoded);
+
+    // Extract encrypted payload
+    let mut byte_string = String::new();
+    let mut extracting = false;
+    for (num, line) in lines.iter().enumerate() {
+        // Wait for payload
+        if !extracting {
+            if !line.contains(":aes-128-cbc") {
+                extracting = true;
+            }
+            continue;
+        }
+
+        if line.contains("EOC") {
+            break;
+        }
+
+        if !line.contains("[HEX DUMP]:") {
+            continue;
+        }
+
+        byte_string.push_str(&line.split_once("[HEX DUMP]:").unwrap().1);
+    }
+
+    let encrypted_data = hex::decode(byte_string.trim()).context("Decode encrypted data")?;
+    res.encrypted_data_len = encrypted_data.len();
 
     Ok(res)
 }