HarmonyOS MD5加密相关demo

let base64 = new util.Base64Helper(); 
export function DoMdByPromise() { 
  // 摘要算法名称。 
  let mdAlgName = "MD5"; 
  // 要进行摘要的数据。 
  let message = "Hello,中国"; 
  let md = cryptoFramework.createMd(mdAlgName); 
  ; 
  // 如果数据量较小，可以使用 update（） 一次传入所有数据。输入参数的长度没有限制。 
  let promiseMdUpdate = md.update({ data: stringToUint8Array(message) }); 
  promiseMdUpdate.then(() => { 
    let PromiseMdDigest = md.digest(); 
    return PromiseMdDigest; 
  }).then(digestOutput => { 
    let mdOutput = digestOutput.data; 
    let str2 = uint8ArrayToHexStr(mdOutput); 
    let str = base64.encodeToStringSync(mdOutput); 
    let str1 = uint8ArrayToString(mdOutput); 
    let mdLen = md.getMdLength(); 
  }).catch((error: BusinessError) => { 
    console.error("[Promise]: error: " + error.message); 
  }); 
} 
 
//摘要结果是Uint8Array类型，转换得到十六进制字符串数据 
function uint8ArrayToHexStr(data: Uint8Array): string { 
  let hexString = ""; 
  let i: number; 
  for (i = 0; i < data.length; i++) { 
    let char = ('00' + data[i].toString(16)).slice(-2); 
    hexString += char; 
  } 
  return hexString; 
} 
 
// 字节流转成可理解的字符串 
function uint8ArrayToString(array:Uint8Array) { 
  // 将UTF-8编码转换成Unicode编码 
  let out: string = ""; 
  let index: number = 0; 
  let len: number = array.length; 
  while (index < len) { 
    let character = array[index++]; 
    switch(character >> 4) { 
      case 0: 
      case 1: 
      case 2: 
      case 3: 
      case 4: 
      case 5: 
      case 6: 
      case 7: 
        out += String.fromCharCode(character); 
        break; 
      case 12: 
      case 13: 
        out += String.fromCharCode(((character & 0x1F) << 6) | (array[index++] & 0x3F)); 
        break; 
      case 14: 
        out += String.fromCharCode(((character & 0x0F) << 12) | ((array[index++] & 0x3F) << 6) | ((array[index++] & 0x3F) << 0)); 
        break; 
      default: 
        break; 
    } 
  } 
  return out; 
} 
function stringToUint8Array(str: string) { 
  return new Uint8Array(buffer.from(str, 'utf-8').buffer) 
}
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