ios - 转换 ASN。 1 个签名到 IEEE P1363 签名

Question

我确实使用下面的代码生成了一个签名，但是，我想要一个 IEEE P1336(长度 80)格式的签名

           guard let signData = SecKeyCreateSignature(
               key,
               SecKeyAlgorithm.ecdsaSignatureMessageX962SHA256,
               signatureString.data(using: .utf8)! as CFData, &error) else {
               let e = error!.takeRetainedValue() as Error

               print("Signing Error \(  e.localizedDescription)")
               return nil
           }
           let signedData = signData as Data
           let signedString = signedData.base64EncodedString(options: [])

Answer 1

我不是 iOS 专家。但是我为 iOS 生成的签名修复了这个问题。您可以自己创建此格式。例如对于 SHA-256 哈希签名。 JavaScript 示例

function parseASN1ToIEEEP1363(signature) {
    const buffer = new ArrayBuffer(signature.length);
    const int8View = new Int8Array(buffer);
    for (let i = 0, strLen = signature.length; i < strLen; i++) {
      int8View[i] = signature.charCodeAt(i);
    }
    //Currently these bytes getting for SHA256. for other hashings need to make it dynamic
    const r = new Int8Array(buffer.slice(4, 36));
    const s = new Int8Array(buffer.slice(39));
    return appendBuffer(r, s);
}

function appendBuffer(buffer1, buffer2) {
  var tmp = new Uint8Array(buffer1.byteLength + buffer2.byteLength);
  tmp.set(new Uint8Array(buffer1), 0);
  tmp.set(new Uint8Array(buffer2), buffer1.byteLength);
  return tmp;
};