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解码代码如下
let decoder = cryptoFramework.createCipher('AES128|GCM|NoPadding');
let gcmParamsSpec = genGcmParamsSpec()
gcmParamsSpec.iv = randomAseIv
await decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, gcmParamsSpec);
let decryptUpdate = await decoder.doFinal(cipherText);
return decryptUpdate;