From 885207adf19f73a35add00ca3ecbe076ed040c63 Mon Sep 17 00:00:00 2001
From: Hatter Jiang <jht5945@gmail.com>
Date: Tue, 4 May 2021 18:55:31 +0800
Subject: [PATCH] feat: calc rsa bit length

---
 src/x509.rs | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/src/x509.rs b/src/x509.rs
index 8bb8381..4b24789 100644
--- a/src/x509.rs
+++ b/src/x509.rs
@@ -68,12 +68,18 @@ impl X509PublicKeyAlgo {
             println!("{:?}", d);
             println!("{:?}", d.as_ref().unwrap().1.content);
             if let BerObjectContent::Sequence(seq) = &d.as_ref().unwrap().1.content {
-                println!("||| {:?}", &seq[0].content);
-                if let BerObjectContent::Integer(int) = seq[0].content {
-                    println!(">>> {:?}", int);
-                    println!(">>> {:?}", int.len());
-                    println!(">>> {:?}", int.len() * 8);
+                let mut rsa_n_len = 0;
+                if let BerObjectContent::Integer(n) = seq[0].content {
+                    rsa_n_len = n.len() - (if n[0] == 0 { 1 } else { 0 });
                 }
+                let rsa_bit_length = || -> Option<i32> {
+                    for bit_len in &[1024, 2048, 3072, 4096] {
+                        if i32::abs(bit_len - (rsa_n_len as i32 * 8)) <= 16 {
+                            return Some(*bit_len);
+                        }
+                    }
+                    None
+                };
             }
             Ok(Self::Rsa)
         } else {