HarmonyOS 64字节的SM2公钥转换非对称秘钥

可以通过密钥参数生成密钥对实现：

//根据密钥参数生成sm2公钥（传入的是64字节即128位长度的十六进制字符串，首位为04标识符的130位十六进制字符串也可以）
export async function convertStrToPubKey(keyStr: string): Promise<cryptoFramework.PubKey> {
  let pubKeyStr = keyStr.startsWith("04") ? keyStr.slice(2) : keyStr
  let pkPart1 = pubKeyStr.slice(0, pubKeyStr.length / 2)
  let pkPart2 = pubKeyStr.slice(pubKeyStr.length / 2)
  let pk: cryptoFramework.Point = {
    x: BigInt("0x" + pkPart1),
    y: BigInt("0x" + pkPart2),
  }
  let pubKeySpec: cryptoFramework.ECCPubKeySpec = {
    params: cryptoFramework.ECCKeyUtil.genECCCommonParamsSpec('NID_sm2'),
    pk: pk,
    algName: "SM2",
    specType: cryptoFramework.AsyKeySpecType.PUBLIC_KEY_SPEC
  }
  let keypairGenerator = cryptoFramework.createAsyKeyGeneratorBySpec(pubKeySpec)
  return await keypairGenerator.generatePubKey()
}