zimhide 0.2.0

Zim Steganography Toolkit - WAV steganography CLI for embedding and extracting encrypted text/audio
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use crate::crypto::asymmetric::recipient_count;
use crate::format::EmbeddedData;
use crate::stego::{LsbSteganography, MetadataSteganography, StegoMethod, StegoMethodType};
use anyhow::{Result, anyhow};
use clap::Args;
use std::fmt::Write;
use std::path::{Path, PathBuf};

#[derive(Args)]
pub struct InspectArgs {
    /// Input WAV file to inspect
    pub input: PathBuf,
}

pub fn run(args: InspectArgs) -> Result<()> {
    if !args.input.exists() {
        return Err(anyhow!(
            "Input file does not exist: {}",
            args.input.display()
        ));
    }

    // Try to extract and parse the embedded data
    let (data, method_used, capacity) = try_extract_with_info(&args.input)?;
    let embedded = EmbeddedData::from_bytes(&data)?;
    let flags = &embedded.header.flags;

    println!("Zimhide Embedded Data");
    println!("=====================");
    println!();

    // Method info
    print!("Method: ");
    match method_used {
        StegoMethodType::Lsb => println!("LSB (Least Significant Bit)"),
        StegoMethodType::Metadata => println!("Metadata (RIFF chunk)"),
    }

    // Content type
    print!("Content: ");
    let mut content_parts = Vec::new();
    if flags.has_text {
        content_parts.push("text");
    }
    if flags.has_audio {
        content_parts.push("audio");
    }
    if content_parts.is_empty() {
        println!("none");
    } else {
        println!("{}", content_parts.join(", "));
    }

    // Payload size
    println!(
        "Payload size: {} bytes{}",
        embedded.header.payload_length,
        if flags.symmetric_encryption || flags.asymmetric_encryption {
            " (encrypted)"
        } else {
            ""
        }
    );

    // Encryption info
    print!("Encryption: ");
    if flags.symmetric_encryption {
        println!("symmetric (passphrase)");
    } else if flags.asymmetric_encryption {
        if let Some(count) = recipient_count(&embedded.payload) {
            println!(
                "asymmetric ({} recipient{})",
                count,
                if count == 1 { "" } else { "s" }
            );
        } else {
            println!("asymmetric");
        }
    } else {
        println!("none");
    }

    // Signature info
    print!("Signed: ");
    if flags.is_signed {
        if let Some(sig) = &embedded.signature {
            let fingerprint = sig.iter().take(6).fold(String::new(), |mut s, b| {
                let _ = write!(s, "{b:02x}");
                s
            });
            println!("yes (sig: {fingerprint}...)");
        } else {
            println!("yes");
        }
    } else {
        println!("no");
    }

    // Capacity info
    let total_size = embedded.total_size();
    let capacity_used = (total_size as f64 / capacity as f64) * 100.0;
    println!();
    println!("Total embedded: {} bytes", total_size);
    println!("Capacity used: {:.1}%", capacity_used);
    println!("Available: {} bytes", capacity.saturating_sub(total_size));

    Ok(())
}

fn try_extract_with_info(path: &Path) -> Result<(Vec<u8>, StegoMethodType, usize)> {
    // Try metadata first
    let metadata_stego = MetadataSteganography::new();
    if let Ok(data) = metadata_stego.extract(path)
        && data.len() >= 4
        && &data[0..4] == b"ZIMH"
    {
        let capacity = metadata_stego.capacity(path)?;
        return Ok((data, StegoMethodType::Metadata, capacity));
    }

    // Try LSB with default options
    let lsb_stego = LsbSteganography::default();
    let data = lsb_stego.extract(path)?;

    if data.len() >= 4 && &data[0..4] == b"ZIMH" {
        let capacity = lsb_stego.capacity(path)?;
        return Ok((data, StegoMethodType::Lsb, capacity));
    }

    Err(anyhow!("No valid zimhide data found in file"))
}