Emet (אמת)

"Mathematics does not lie. Truth is immutable."

Emet (Hebrew for Truth) is a command-line tool built in Rust designed to guarantee the integrity and authorship of digital files. Whether sealing the source code of a critical system or the chapters of an epic 23-volume saga (for example), Emet creates a mathematical proof that a specific content existed at a specific time and was signed by you.

At its core, Emet utilizes Tequel 0.7.6, a custom low-level hashing library, ensuring that even a single-bit alteration is detected.

🚀 Features (v0.1.0)

• Seal: Generates a digital "fingerprint" of the file by combining the content, a UTC timestamp, and your private key.
• Audit: Verifies if the current file matches the original seal through the check command.
• Double-Check Security: Validates both Integrity (has the physical file changed?) and Authenticity (does the signature belong to the true author?).
• Transparent Persistence: Generates .emet files in JSON format, allowing for human auditing and easy archiving.

🛠️ The Workflow of Truth

The sealing and verification process follows a rigorous cryptographic pipeline:

1. Hashing: Emet reads the file bytes and uses the Tequel algorithm to generate a high-entropy hash.
2. Signing: The hash is concatenated with the timestamp and your private_key. The result of this mix is hashed again to create the digital_signature.
3. Verification: When running check, Emet reconstructs the signature with current data. If a single character in the original file or the date in the seal is modified, the "Truth is Violated."

💻 Usage Example

In your main.rs:

// Instance Emet
let mut emet = Emet::up("private_key");

// Sealing a file
let sealed = emet.seal("chapter_01.md")?;
emet.save_seal("chapter_01.md", &sealed)?;

// Verifying integrity
match emet.check("chapter_01.md", "chapter_01.md.emet") {
    Ok(_) => println!("✅ Good! The truth remains intact."),
    Err(e) => eprintln!("❌ Error: {}", e), // e.g., Truth Violated
}

or via CLI:

emet up my_private_key
emet seal ./myfile.txt
emet check ./myfile.txt ./myfile.txt.emet

🧬 Tecnnical Specifications

• Language: Rust (2024 Edition)
• Hashing Engine: Tequel v0.7.6 (7.999885 bits/byte entropy)
• Seal Format: JSON (via Serde)
• Time Standard: UTC RCF3339 (via Chrono)

📜 Philosophy

Emet is not just a checksum utility; it is a personal digital notary. It was built to protect the vision of creators who understand that while the future may be uncertain, the past and authorship must be incontestable.

Developed by Gabriel "dotxav" Xavier. If the truch can be corrupted, it is not the truth.

📄 License

Licensed under the MIT License. Free to use, modify, and distribute.