Function createSignatureBlock

src/node/sign.ts:224–240

* Creates a signature block buffer with PKCS#7 signature

(pkcs7Signature: Buffer)

 * Creates a signature block buffer with PKCS#7 signature
 */
function createSignatureBlock(pkcs7Signature: Buffer): Buffer {
  const parts: Buffer[] = [];

  // Header
  parts.push(Buffer.from(SIGNATURE_HEADER, "utf-8"));

  // PKCS#7 signature length and data
  const sigLengthBuffer = Buffer.alloc(4);
  sigLengthBuffer.writeUInt32LE(pkcs7Signature.length, 0);
  parts.push(sigLengthBuffer);
  parts.push(pkcs7Signature);

  // Footer
  parts.push(Buffer.from(SIGNATURE_FOOTER, "utf-8"));

  return Buffer.concat(parts);
}

/**
 * Extracts the signature block from a signed MCPB file