cryptopals

commit e2834bcb33a4d98a7aa33c2bcbb2dc406fffeadc
Author: minerva-jupiter <ryouturn@gmail.com>
Date:   Wed, 25 Mar 2026 23:48:19 +0900

init

Diffstat:
A
.gitignore
 | 
1
+
A
Cargo.lock
 | 
7
+++++++
A
Cargo.toml
 | 
6
++++++
A
src/bin/1-1.rs
 | 
51
+++++++++++++++++++++++++++++++++++++++++++++++++++
A
src/bin/1-2.rs
 | 
11
+++++++++++
A
src/lib.rs
 | 
9
+++++++++
A
src/main.rs
 | 
3
+++

7 files changed, 88 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "cryptopals"
+version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "cryptopals"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/src/bin/1-1.rs b/src/bin/1-1.rs
@@ -0,0 +1,51 @@
+use cryptopals::utils::read_buffer;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let hex_input = read_buffer()?;
+    let bytes = hex_to_bytes(&hex_input);
+    let base64_output = bytes_to_base64(&bytes);
+
+    println!("{}", base64_output);
+
+    Ok(())
+}
+
+const BASE64_TABLE: &[u8; 64] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+fn hex_to_bytes(hex: &str) -> Vec<u8> {
+    hex.as_bytes()
+        .chunks(2)
+        .map(|chunk| {
+            let s = std::str::from_utf8(chunk).unwrap();
+            u8::from_str_radix(s, 16).expect("Invalid hex")
+        })
+        .collect()
+}
+
+fn bytes_to_base64(bytes: &[u8]) -> String {
+    let mut result = String::with_capacity((bytes.len() + 2) / 3 * 4);
+
+    for chunk in bytes.chunks(3) {
+        let b0 = chunk[0] as usize;
+        let b1 = chunk.get(1).map(|&b| b as usize).unwrap_or(0);
+        let b2 = chunk.get(2).map(|&b| b as usize).unwrap_or(0);
+
+        let n = (b0 << 16) | (b1 << 8) | b2;
+
+        result.push(BASE64_TABLE[(n >> 18) & 0x3F] as char);
+        result.push(BASE64_TABLE[(n >> 12) & 0x3F] as char);
+
+        if chunk.len() > 1 {
+            result.push(BASE64_TABLE[(n >> 6) & 0x3F] as char);
+        } else {
+            result.push('=');
+        }
+
+        if chunk.len() > 2 {
+            result.push(BASE64_TABLE[n & 0x3F] as char);
+        } else {
+            result.push('=');
+        }
+    }
+    result
+}
diff --git a/src/bin/1-2.rs b/src/bin/1-2.rs
@@ -0,0 +1,11 @@
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    println!("Enter first buffer");
+    let first = std::read_line()?;
+    println!("Enter second buffer");
+    let second = std::read_line()?;
+    if first.len() != second.len() {
+        println!("buffer length is not matched!");
+        return Err(Box::new(()) as Box<dyn std::error::Error>);
+    }
+    Ok(())
+}
diff --git a/src/lib.rs b/src/lib.rs
@@ -0,0 +1,9 @@
+pub mod utils {
+    pub fn read_buffer() -> Result<String, Box<dyn std::error::Error>> {
+        let mut buffer = String::new();
+        std::io::stdin()
+            .read_line(&mut buffer)
+            .expect("Failed to read line.");
+        Ok(buffer.trim().to_string())
+    }
+}
diff --git a/src/main.rs b/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}