ASN.1 decode

Cargo.lock

@@ -67,6 +67,12 @@ version = "1.0.97"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dcfed56ad506cb2c684a14971b8861fdc3baaaae314b9e5f9bb532cbe3ba7a4f"
 
+[[package]]
+name = "base64"
+version = "0.22.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
+
 [[package]]
 name = "bytes"
 version = "1.10.0"
@@ -424,6 +430,7 @@ name = "scep_req_parser"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "base64",
  "clap",
  "env_logger",
  "http",

Cargo.toml

@@ -9,4 +9,5 @@ env_logger = "0.11.6"
 clap = { version = "4.5.31", features = ["derive", "env"] }
 http = { version = "1.2.0" }
 anyhow = "1.0.97"
-url = "2.5.4"
+url = "2.5.4"
+base64 = "0.22.1"

src/main.rs

@@ -2,7 +2,11 @@ use clap::Parser;
 use http::StatusCode;
 use std::collections::HashMap;
 use std::str::FromStr;
+use base64::alphabet::STANDARD;
 use url::Url;
+use base64::prelude::*;
+use base64::Engine as _;
+use base64::engine::general_purpose::URL_SAFE as BASE64_URL_URL_SAFE;
 
 /// Simple SCEP parser program
 #[derive(Parser, Debug)]
@@ -102,7 +106,7 @@ fn parse_response(req: &[u8]) -> anyhow::Result<http::Response<Vec<u8>>> {
     }
 }
 
-#[derive(Debug, Copy, Clone)]
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
 enum Operation {
     GetCACaps,
     GetCACert,
@@ -136,4 +140,13 @@ fn main() {
 
 
     println!("{} - {} - {op:?}", response.headers().get("Date").unwrap().to_str().unwrap(), response.status().as_u16());
+
+    // Parse details about PKIOperation request
+    // https://www.rfc-editor.org/rfc/rfc8894.html#section-4.3
+    if op == Operation::PKIOperation {
+        let req_b64 = BASE64_URL_URL_SAFE.encode(&request.body());
+        let res_b64 = BASE64_URL_URL_SAFE.encode(&response.body());
+        println!("https://lapo.it/asn1js/#{req_b64}");
+        println!("https://lapo.it/asn1js/#{res_b64}");
+    }
 }