DeLink : Decrypting D-Link Firmware Across Devices With A Rust-Based Library

A crypto library to decrypt various encrypted D-Link firmware images.

Confirmed to work on the following D-Link devices:

• E15
• E30
• R12
• R15
• R18
• M18
• M30
• M32
• M60
• DAP-1665
• DAP-1820
• DAP-1955
• DAP-2610
• DAP-2680
• DAP-2682
• DIR-850L A1
• DIR-850L B1
• DAP-1610 B1
• DAP-1620 B1
• DAP-LX1880
• DRA-1360 A1
• DRA-2060 A1
• DIR-1750
• DIR-2055
• DIR-LX1870
• DIR-X1560
• DIR-X1870
• DIR-X4860
• DIR-X5460
• DIR-822
• DIR-842
• DIR-878
• DIR-2150
• DIR-3040
• DIR-3060

Encryption keys/methods are often re-used amongst devices and firmware, so other devices may also be supported.

Compiling

You must have the Rust compiler installed:

cargo build --release

Command Line Usage:

./target/release/delink encrypted.bin decrypted.bin

Rust Library Usage:

// Read in the contents of an encrypted firmware image
match std::fs::read("DIR850LB1_FW220WWb03.bin") {
    Err(e) => {
        eprint!("Failed to read input file: {}", e);
    }
    Ok(encrypted_data) => {
        // Attempt to decrypt the encrypted data
        match delink::decrypt(&encrypted_data) {
            Err(e) => {
                eprint!("Decryption failed: {}", e);
            }
            Ok(decrypted_data) => {
                // Decryption successful, save decrypted data to disk
                if let Err(e) = std::fs::write("decrypted.bin", decrypted_data) {
                    eprint!("Failed to write decrypted data: {}", e);
                }
            }
        }
    }
}