Function decrypt

Source

function decrypt(encryptedData: string, iv: string): string {
  const key = getEncryptionKey();
  const ivBuffer = Buffer.from(iv, "hex");

  // Validate encrypted data
  if (!encryptedData) {
    throw new Error("Encrypted data is undefined or empty");
  }

  // Extract data and authentication tag
  const encryptedParts = encryptedData.split(":");
  const encrypted = encryptedParts[0];
  const authTag = Buffer.from(encryptedParts[1], "hex");

  const decipher = crypto.createDecipheriv(ALGORITHM, key, ivBuffer);
  decipher.setAuthTag(authTag);

  let decrypted = decipher.update(encrypted, "hex", "utf8");
  decrypted += decipher.final("utf8");

  return decrypted;
}
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