HarmonyOS SM2依据已有的字符串的私钥和公钥进行签名和验签

function encryptMessagePromise(publicKey:Uint8Array|string) { 
  let publickKeyData = new Uint8Array(); 
  if(typeof publicKey === ‘string’){ 
    publickKeyData = stringToUint8Array(publicKey) 
  }else{ 
    publickKeyData = publicKey; 
  } 
  // 创建 AsyKeyGenerator 实例。 
  let sm2Generator = cryptoFramework.createAsyKeyGenerator(“SM2_256”); 
  // 创建 Cipher 实例。 
  let cipher = cryptoFramework.createCipher(“SM2_256|SM3”); 
  // 使用 convertKey导入公钥或私钥获取密钥对。 
  const publicKeyDataBlob:cryptoFramework.DataBlob = { data: publickKeyData }; 
  sm2Generator.convertKey(publicKeyDataBlob,null).then((sm2KeyPair: cryptoFramework.KeyPair): Promise<void> => { 
    let pubKey = sm2KeyPair.pubKey; 
    // 初始化 Cipher 实例并使用公钥对消息进行加密。 
    return cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, pubKey, null); 
  }).then(() => { 
    // 加密 
    let input: cryptoFramework.DataBlob = { data: stringToUint8Array(plan) }; 
    return cipher.doFinal(input); 
  }).then(dataBlob => { 
    // 获取加密数据。 
    console.info("EncryptOutPut is " + dataBlob.data); 
  }); 
}