TypeScript与量子密码学：利用类型安全保障未来安全

            function signMessage(privateKey, message) {  
    // Simplified (Insecure!) signing process
    const signature = hash(privateKey + message);
    return signature;
}

function verifySignature(publicKey, message, signature) {
    // Simplified (Insecure!) verification process
    const expectedSignature = hash(publicKey + message);
    return signature === expectedSignature;
}
            

              
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            // Define data types for clarity and security
interface PrivateKey {
    key: Uint8Array; // Represents the private key as an array of bytes
}

interface PublicKey {
    key: Uint8Array; // Represents the public key as an array of bytes
}

interface Signature {
    signature: Uint8Array; // Represents the digital signature as an array of bytes
}

function signMessage(privateKey: PrivateKey, message: Uint8Array): Signature {
    // Implement Dilithium signing process (using a crypto library)
    const signature = crypto.sign(privateKey.key, message);
    return { signature: signature };
}

function verifySignature(publicKey: PublicKey, message: Uint8Array, signature: Signature): boolean {
    // Implement Dilithium verification process (using a crypto library)
    try {
        return crypto.verify(publicKey.key, message, signature.signature);
    } catch (e) {
        // Handle verification failure
        console.error("Signature verification failed:", e);
        return false;
    }
}

// Example usage
const { publicKey, privateKey } = generateDilithiumKeyPair(); // Assuming a key generation function
const message = new TextEncoder().encode("This is a secret message.");
const signature = signMessage(privateKey, message);
const isVerified = verifySignature(publicKey, message, signature);

if (isVerified) {
    console.log("Signature is valid.");
} else {
    console.log("Signature is invalid.");
}
            

              
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// Hypothetical QKD Service (using an API from a QKD provider)
interface QKDService {
    generateQKey(partnerId: string): Promise<Uint8Array>; // Retrieves a quantum key
}

// Example implementation (simplifed)
async function secureCommunication(qkdService: QKDService, partnerId: string, message: Uint8Array): Promise<Uint8Array> {
    // 1. Establish Secure Key Exchange
    const quantumKey = await qkdService.generateQKey(partnerId);

    // 2. Encryption (using a symmetric cipher, e.g., AES) - Requires a crypto library
    const encryptedMessage = encryptMessage(message, quantumKey);

    // 3. Send encrypted message
    // ... (via a secure communication channel)

    return encryptedMessage;  // Or return acknowledgement or whatever is needed.
}

            

              
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// Define interfaces for transaction and signature
interface Transaction {
    data: Uint8Array;
    timestamp: number;
}

// Use the new post-quantum signature scheme
interface PostQuantumSignature {
    signature: Uint8Array;
}

// A post quantum Signature class could be defined and methods within it would take in Uint8Array data
class PostQuantumSignature {  // Example: Post-quantum Dilithium signature
    private keyPair: {publicKey: Uint8Array; privateKey: Uint8Array};

    constructor() {
        this.keyPair = generateDilithiumKeyPair();
    }

    signTransaction(transaction: Transaction): PostQuantumSignature {
        const message = transaction.data;
        const signature = crypto.sign(this.keyPair.privateKey, message);
        return { signature: signature };
    }

    verifyTransaction(transaction: Transaction, signature: PostQuantumSignature): boolean {
        const message = transaction.data;
        try {
            return crypto.verify(this.keyPair.publicKey, message, signature.signature);
        } catch (e) {
            console.error("Signature verification failed:", e);
            return false;
        }
    }
}

function signTransaction(transaction: Transaction, signer: PostQuantumSignature): PostQuantumSignature {
    // Use the post-quantum signature scheme
    return signer.signTransaction(transaction);
}

function verifyTransaction(transaction: Transaction, signature: PostQuantumSignature, signer: PostQuantumSignature): boolean {
   return signer.verifyTransaction(transaction, signature)
}


// Example usage
const transaction: Transaction = {
    data: new TextEncoder().encode("Document contents"),
    timestamp: Date.now(),
};

const signer = new PostQuantumSignature();
const signature = signTransaction(transaction, signer);
const isValid = verifyTransaction(transaction, signature, signer);

if (isValid) {
    console.log("Transaction is valid.");
} else {
    console.log("Transaction is invalid.");
}
            

              
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