HarmonyOS 鸿蒙Next能否提供SM2（国密）请求实现的demo样例

参考如下demo示例：

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 ''

    }

  }

HarmonyOS 鸿蒙Next确实支持SM2（国密）加密请求。以下是一个简单的demo样例，用于展示如何在HarmonyOS中实现SM2加密：

import cryptoFramework from "@ohos.security.cryptoFramework";

async function generateSM2KeyPair() {
    let pkdata = /* 公钥数据 */;
    let skdata = /* 私钥数据 */;
    let pubkeyblob = { data: new Uint8Array(pkdata) };
    let prikeyblob = { data: new Uint8Array(skdata) };
    let sm2generator = cryptoFramework.createAsyKeyGenerator('sm2_256');
    let keypair = await sm2generator.convertKey(pubkeyblob, prikeyblob);
    return keypair;
}

async function encryptWithSM2(plaintext, pubkey) {
    const cipher = cryptoFramework.createCipher('sm2_256|sm3');
    await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, pubkey, null);
    const encryptData = await cipher.doFinal({ data: new Uint8Array(this.normalStringToUint8Array(plaintext)) });
    return this.uint8ArrayToHexString(encryptData.data);
}

// 注意：decryptWithSM2函数及具体实现略，可参考encryptWithSM2进行解密操作。

以上代码展示了如何生成SM2密钥对并进行加密操作。请根据实际环境填充公钥和私钥数据，并实现normalStringToUint8Array和uint8ArrayToHexString等辅助函数。

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