能否提供SM2（国密）请求，HarmonyOS实现的demo样例

public async generateSM2KeyTest() { 
  let pkData = new Uint8Array([48, 89, 48, 19, 6, 7, 42, 134, 72, 206, 61, 2, 1, 6, 8, 42, 129, 28, 207, 85, 1, 130, 45, 3, 66, 0, 4, 90, 3, 58, 157, 190, 248, 76, 7, 132, 200, 151, 208, 112, 230, 96, 140, 90, 238, 211, 155, 128, 109, 248, 40, 83, 214, 78, 42, 104, 106, 55, 148, 249, 35, 61, 32, 221, 135, 143, 100, 45, 97, 194, 176, 52, 73, 136, 174, 40, 70, 70, 34, 103, 103, 161, 99, 27, 187, 13, 187, 109, 244, 13, 7]) 
  let skData = new Uint8Array([48, 49, 2, 1, 1, 4, 32, 54, 41, 239, 240, 63, 188, 134, 113, 31, 102, 149, 203, 245, 89, 15, 15, 47, 202, 170, 60, 38, 154, 28, 169, 189, 100, 251, 76, 112, 223, 156, 159, 160, 10, 6, 8, 42, 129, 28, 207, 85, 1, 130, 45]) 
  let pubKeyBlob: cryptoFramework.DataBlob = { data: pkData } 
  let priKeyBlob: cryptoFramework.DataBlob = { data: skData } 
  let sm2Generator = cryptoFramework.createAsyKeyGenerator('SM2_256'); 
  let keyPair = await sm2Generator.convertKey(pubKeyBlob, priKeyBlob); 
  const pubKey = keyPair.pubKey 
  const priKey = keyPair.priKey 
  this.sm2PubKey = pubKey 
  this.sm2PubKeyString = this.uint8ArrayToHexString(pubKey.getEncoded().data) 
  // this.sm2PubKeyArr = pubKey.getEncoded().data 
  this.sm2PriKey = priKey 
  this.sm2PriKeyString = this.uint8ArrayToHexString(priKey.getEncoded().data) 
} 
// 指定生成 sm2 密钥对 
public async convertSM2AsyKey(pubKeyStr: string, priKeyStr: string): Promise<boolean> { 
  const promise = new Promise<boolean>((resolve, reject) => { 
    let pubKeyArray = this.hexStringToUint8Array(pubKeyStr) 
    let priKeyArray = this.hexStringToUint8Array(priKeyStr) 
    let pubKeyBlob: cryptoFramework.DataBlob = { data: pubKeyArray }; 
    let priKeyBlob: cryptoFramework.DataBlob = { data: priKeyArray }; 
    let generator = cryptoFramework.createAsyKeyGenerator('SM2_256'); 
    generator.convertKey(pubKeyBlob, priKeyBlob, (error, data) => { 
      if (error) { 
        console.error(`convertKey failed, ${error.code}, ${error.message}`); 
        resolve(false) 
        return; 
      } 
      this.sm2PubKey = data.pubKey 
      this.sm2PubKeyString = pubKeyStr 
      this.sm2PriKey = data.priKey 
      this.sm2PriKeyString = priKeyStr 
      console.info('convertKey success'); 
      resolve(true) 
    }); 
  }) 
  return promise 
 
}
/** 
 *  SM2 加密 
 *  模式：SM2_256|SM3 默认 
 */ 
public async EncryptWithSM2(plainText: string): Promise<string> { 
  const pubKey = this.sm2PubKey 
  if (plainText.length <= 0 || pubKey === undefined) { 
  return '' 
} 
try { 
  const dataBlob: cryptoFramework.DataBlob = { data: this.normalStringToUint8Array(plainText) } 
  const cipher = cryptoFramework.createCipher('SM2_256|SM3') 
  await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, pubKey, null) 
  const encryptData = await cipher.doFinal(dataBlob) 
  return this.uint8ArrayToHexString(encryptData.data) 
} catch (e) { 
  console.error(`[YLog] encrypt error with ${JSON.stringify(e)}`) 
  return '' 
} 
} 
 
/** 
 *  SM2 解密 
 *  模式：SM2_256|SM3 默认 
 */ 
public async DecryptWithSM2(cipherText: string): Promise<string> { 
  const priKey = this.sm2PriKey 
  if (cipherText.length <= 0 || priKey === undefined) { 
  return '' 
} 
try { 
  const dataBlob: cryptoFramework.DataBlob = { data: this.hexStringToUint8Array(cipherText) } 
  const decoder = cryptoFramework.createCipher('SM2_256|SM3') 
  await decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, priKey, null) 
  const decryptData = await decoder.doFinal(dataBlob) 
  return this.uint8ArrayToNormalString(decryptData.data) 
} catch (e) { 
  console.error(`[YLog] decrypt error with ${JSON.stringify(e)}`) 
  return '' 
} 
}
/** 
 * string Uint8Array相互转换 (正常字符串) 
 */ 
public normalStringToUint8Array(str: string) { 
  let en = new util.TextEncoder() 
  let result = en.encodeInto(str) 
  return result 
} 
public uint8ArrayToNormalString(array: Uint8Array) { 
  let de = util.TextDecoder.create('utf-8', { ignoreBOM : true }) 
  let result = de.decodeWithStream(array, {stream: false}) 
  return result 
} 
 
/** 
 * Uint8Array & String 互相转换 (取高4位和低4位) (16进制字符串) 
 */ 
private uint8ArrayToHexString(array: Uint8Array, lower: boolean = true) { 
  let temp = "" 
  const hexDigits = this.hexDigits 
  for (let i = 0; i < array.length; ++i) { 
    const data = array[i] 
    // 高四位 
    let high = hexDigits[(data & 0xf0) >> 4] 
    temp += high 
    // 低四位 
    let low = hexDigits[data & 0x0f] 
    temp += low 
  } 
  return lower ? temp : temp.toUpperCase() 
} 
private hexStringToUint8Array(plain: string, lower: boolean = true) { 
  let result: Uint8Array = new Uint8Array(plain.length / 2) 
  for (let i = 0; i < plain.length - 1; i = i + 2) { 
    const lowString = plain.charAt(i+1) 
    const highString = plain.charAt(i) 
    // 低四位 
    let low = parseInt(lowString, 16).toString(2) 
    while (low.length < 4) { low = '0'+ low } 
    // 高四位 
    let high = parseInt(highString, 16).toString(2) 
    while (high.length < 4) { high = '0' + high } 
    // 全八位转10进制 
    const res = parseInt(high+low, 2) 
    // 放入Uint8Array 
    result[i / 2] = res 
  } 
  return result 
}
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