rsa 公钥解密初始化报错

const RSA512_PKCS1: string = 'RSA512|PKCS1'; 
const RSA_BODY_KEY:string='MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCykN5sbKMPPc3S3YpuU9qbO9FFnk/lBliWEfBoccvk7oAt1KEKrqCyGRhuXi9UeUZmMVDbormv7InPy+oVgteJyQ6smHdmmDJuDl9VB0GbVouqTTYJVE/myK/dmDzySf6FUfzNROWeEIBWCGdnI7xI6ja1Ed9+scfFF+O7RQqn0QIDAQAB' 
 
let datainfo='RIeGeqVUFztbyS848YwmhJIhW4V2fKeX8QyiqQQiwprb6jSWLa7wACUqJQCB+qH00QQFLISiailyLI3yK5K/cIt6IBTumvUb9GdP8K8uqqPCSCU4tgPUOEWznC4F5KU8Ft5sHALuiXWvEUpMRwREIPS8dVPEy6YEzdHdqC65LSM=' 
 
let cipherModel: CipherModel = new CipherModel(); 
let infoStr=await cipherModel.rsaDecryptByPublic(datainfo,RSA_BODY_KEY) 
rsaDecryptByPublic(message: string,publicKey:string):Promise<string> { 
  let rsaGenerator = cryptoFramework.createAsyKeyGenerator(RSA512_PRIMES_2); 
  let cipher = cryptoFramework.createCipher(RSA512_PKCS1); 
  let that = new util.Base64Helper(); 
  let pubKey = that.decodeSync(publicKey); 
  let pubKeyBlob: cryptoFramework.DataBlob = { data: pubKey }; 
  let promiseResult=new Promise<string>((resolve: Function, reject: Function)=>{ 
    rsaGenerator.convertKey(pubKeyBlob, null, (err, keyPair) => { 
      if (err) { 
        Logger.error("convertKey: error." + (err as BusinessError).code); 
        reject(err); 
        return 
      } 
      cipher.init(cryptoFramework.CryptoMode.DECRYPT_MODE, keyPair.pubKey, null, async (err, data) => { 
        try { 
          let newMessage = that.decodeSync(message); 
          let cipherText: cryptoFramework.DataBlob = { data: newMessage }; 
          let cipherTextSplitLen = 128; // RSA密钥每次加密生成的密文字节长度计算方式：密钥位数/8 
          let decryptText = new Uint8Array(); 
          for (let i = 0; i < cipherText.data.length; i += cipherTextSplitLen) { 
            let updateMessage = cipherText.data.subarray(i, i + cipherTextSplitLen); 
            let updateMessageBlob: cryptoFramework.DataBlob = { data: updateMessage }; 
            // 将密文按128字节进行拆分解密，得到原文后进行拼接 
            let updateOutput = await cipher.doFinal(updateMessageBlob); 
            let mergeText = new Uint8Array(decryptText.length + updateOutput.data.length); 
            mergeText.set(decryptText); 
            mergeText.set(updateOutput.data, decryptText.length); 
            decryptText = mergeText; 
          } 
          let result = this.uint8ArrayToString(decryptText); 
          resolve(result) 
        } catch (err) { 
          Logger.info(TAG, "cipher init error: " + (err as BusinessError).code); 
          return err; 
        } 
      }) 
    }) 
  }); 
  return promiseResult 
}