browserify-hybrid-crypto/src/utils.ts

TypeScript implementation Hybrid encryption and signing library built on Web Crypto (AES + RSA + HMAC).

export function getCryptoImpl() {
  return crypto;
}

export function toBase64(data: ArrayBuffer | Uint8Array): string {
  const uint8 = data instanceof Uint8Array ? data : new Uint8Array(data);
  if (typeof window !== "undefined" && window.btoa) {
    return window.btoa(String.fromCharCode(...uint8));
  } else if (typeof Buffer !== "undefined") {
    return Buffer.from(uint8).toString("base64");
  } else {
    throw new Error("No base64 implementation available");
  }
}

export function fromBase64(base64: string): ArrayBuffer {
  if (typeof window !== "undefined" && window.atob) {
    const binary = window.atob(base64);
    const bytes = new Uint8Array(binary.length);
    for (let i = 0; i < binary.length; i++) {
      bytes[i] = binary.charCodeAt(i) & 0xff;
    }
    return bytes.buffer;
  } else if (typeof Buffer !== "undefined") {
    const buf = Buffer.from(base64, "base64");
    return new Uint8Array(buf).buffer;
  } else {
    throw new Error("No base64 implementation available");
  }
}