RSA 加密实践问题。将java中RSA加密代码翻译成 arkts 代码时，无法确定正确的API。希望提供正确的arkts代码

//加解密分开示例： 
//加密: 
public static async add(str: string, publicKey: string): Promise<string> { 
  let result = ''; 
  try { 
  let asyKeyGenerator = cryptoFramework.createAsyKeyGenerator(this.ASY_KEY_NAME_RSA_3072); 
  const publicKeyDataBlob = { data: this.decodeToUint8Array(publicKey) }; 
  let cipher = cryptoFramework.createCipher(this.ALG_NAME_RSA_3072); //创建一个 Cipher (解密)对象 
  let put: cryptoFramework.DataBlob = { data: this.stringToUint8Array(str) }; 
  let globalKeyPair: cryptoFramework.KeyPair = await asyKeyGenerator.convertKey(publicKeyDataBlob, null); 
  await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, globalKeyPair.pubKey, null); 
  const finalRes = await cipher.doFinal(put) 
  result = this.encodeToString(finalRes.data); 
} catch (err) { 
  console.log(err.message) 
} 
return result; 
} 
 
//解密 
public static async rsaDecrypt(message: string | Uint8Array, privateKey: string): Promise<string> { 
  let result = ''; 
  try { 
  let asyKeyGenerator = cryptoFramework.createAsyKeyGenerator(this.ASY_KEY_NAME_RSA_3072); 
  const privateKeyDataBlob = { data: this.decodeToUint8Array(privateKey) }; 
  const keyPair = await asyKeyGenerator.convertKey(null, privateKeyDataBlob); 
  let cipher = cryptoFramework.createCipher(this.ALG_NAME_RSA_3072); //创建一个 Cipher (解密)对象 
  await cipher.init(cryptoFramework.CryptoMode.DECRYPT_MODE, keyPair.priKey, null); 
  let bytes: Uint8Array = null; 
  if (typeof message === 'string') { 
  bytes = this.decodeToUint8Array(message); 
} else { 
  bytes = message; 
} 
const finalRes = await cipher.doFinal({ data: bytes }) 
result = this.uint8ArrayToString(finalRes.data); 
} catch (err) { 
  console.error(err.code) 
} 
return result; 
}