Exemplo de geração de Hash utilizando Streams

import { hsm } from "@dinamonetworks/hsm-dinamo";
import { Readable } from "stream";

const streamHashExample = async () => {
    let conn;
    try {
        // Define os parâmetros de conexão com o HSM
        const options = {
            host: "127.0.0.1",
            authUsernamePassword: {
                username: "master",
                password: "12345678",
            },
        };

        // Estabelece conexão com o HSM
        conn = await hsm.connect(options);
        console.log("Connected to HSM successfully.");

        // Define as opções para o stream de hash
        const hashOptions = {
            algorithm: hsm.enums.HASH_ALGORITHMS.ALG_SHA256
        };

        // 1. Cria o Transform Stream de hash
        const hashStream = conn.cryptography.createHashStream(hashOptions);

        // 2. Simula uma fonte de dados
        const sourceData = "Data to be processed by hash stream. ".repeat(10);
        const sourceStream = Readable.from(sourceData);

        console.log("Processing data through hash stream...");
        
        let digest = Buffer.alloc(0);

        // 3. Conecta os streams
        sourceStream.pipe(hashStream);

        // 4. Coleta o resultado (o hash final é emitido ao encerrar o stream)
        for await (const chunk of hashStream) {
            digest = chunk;
        }

        console.log("Hash processing completed.");
        console.log("Final Digest (hex):", digest.toString("hex"));

    } catch (err) {
        console.error("Error during stream hash example:", err.message);
    } finally {
        if (conn) {
            await conn.disconnect();
            console.log("Disconnected from HSM.");
        }
    }
};

streamHashExample();

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