# 使用AES对称密钥（ECB模式）加解密(ArkTS)

请查看对称密钥加解密算法规格：AES。

**加密**

1.  调用cryptoFramework.createSymKeyGenerator、SymKeyGenerator.generateSymKey，生成密钥算法为AES、密钥长度为128位的对称密钥（SymKey）。
    
    如何生成AES对称密钥，开发者可以参考以下示例，并结合对称密钥生成和转换规格：AES和随机生成对称密钥进行理解。参考文档与当前示例可能存在入参差异，请在阅读时注意区分。
    
2.  调用cryptoFramework.createCipher，指定字符串参数'AES128|ECB|PKCS7'，创建对称密钥类型为AES128、分组模式为ECB、填充模式为PKCS7的Cipher实例，用于完成加密操作。
    
3.  调用Cipher.init，设置模式为加密（cryptoFramework.CryptoMode.ENCRYPT\_MODE），指定加密密钥（SymKey），ECB模式Params为空，初始化加密Cipher实例。
    
4.  加密内容较短时，可以不调用update，直接调用Cipher.doFinal，获取加密后的数据。
    

**解密**

1.  调用cryptoFramework.createCipher，指定字符串参数'AES128|ECB|PKCS7'，创建对称密钥类型为AES128、分组模式为ECB、填充模式为PKCS7的Cipher实例，用于完成解密操作。
    
2.  调用Cipher.init，设置模式为解密（cryptoFramework.CryptoMode.DECRYPT\_MODE），指定解密密钥（SymKey），ECB模式Params为空，初始化解密Cipher实例。
    
3.  解密内容较短时，可以不调用update，直接调用Cipher.doFinal，获取解密后的数据。
    

*   异步方法示例：
    
    ```
    import { cryptoFramework } from '@kit.CryptoArchitectureKit';
    import { buffer } from '@kit.ArkTS';
    
    // 加密消息
    async function encryptMessagePromise(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
      let cipher = cryptoFramework.createCipher('AES128|ECB|PKCS7');
      await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, null);
      let cipherData = await cipher.doFinal(plainText);
      return cipherData;
    }
    
    // 解密消息
    async function decryptMessagePromise(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
      let decoder = cryptoFramework.createCipher('AES128|ECB|PKCS7');
      await decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, null);
      let decryptData = await decoder.doFinal(cipherText);
      return decryptData;
    }
    
    async function genSymKeyByData(symKeyData: Uint8Array) {
      let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
      let aesGenerator = cryptoFramework.createSymKeyGenerator('AES128');
      let symKey = await aesGenerator.convertKey(symKeyBlob);
      console.info('convertKey result: success.');
      return symKey;
    }
    
    async function aesECB() {
      try {
        let keyData = new Uint8Array([83, 217, 231, 76, 28, 113, 23, 219, 250, 71, 209, 210, 205, 97, 32, 159]);
        let symKey = await genSymKeyByData(keyData);
        let message = 'This is a test';
        let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
        let encryptText = await encryptMessagePromise(symKey, plainText);
        let decryptText = await decryptMessagePromise(symKey, encryptText);
        if (plainText.data.toString() === decryptText.data.toString()) {
          console.info('decrypt ok.');
          console.info('decrypt plainText: ' + buffer.from(decryptText.data).toString('utf-8'));
        } else {
          console.error('decrypt failed.');
        }
      } catch (error) {
        console.error(`AES ECB failed: errCode: ${error.code}, message: ${error.message}`);
      }
    }
    ```
    
*   同步方法示例：
    
    ```
    import { cryptoFramework } from '@kit.CryptoArchitectureKit';
    import { buffer } from '@kit.ArkTS';
    
    // 加密消息
    function encryptMessage(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
      let cipher = cryptoFramework.createCipher('AES128|ECB|PKCS7');
      cipher.initSync(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, null);
      let cipherData = cipher.doFinalSync(plainText);
      return cipherData;
    }
    
    // 解密消息
    function decryptMessage(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
      let decoder = cryptoFramework.createCipher('AES128|ECB|PKCS7');
      decoder.initSync(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, null);
      let decryptData = decoder.doFinalSync(cipherText);
      return decryptData;
    }
    
    function genSymKeyByData(symKeyData: Uint8Array) {
      let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
      let aesGenerator = cryptoFramework.createSymKeyGenerator('AES128');
      let symKey = aesGenerator.convertKeySync(symKeyBlob);
      console.info('convertKeySync result: success.');
      return symKey;
    }
    
    function main() {
      try {
        let keyData = new Uint8Array([83, 217, 231, 76, 28, 113, 23, 219, 250, 71, 209, 210, 205, 97, 32, 159]);
        let symKey = genSymKeyByData(keyData);
        let message = 'This is a test';
        let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
        let encryptText = encryptMessage(symKey, plainText);
        let decryptText = decryptMessage(symKey, encryptText);
        if (plainText.data.toString() === decryptText.data.toString()) {
          console.info('decrypt ok.');
          console.info('decrypt plainText: ' + buffer.from(decryptText.data).toString('utf-8'));
        } else {
          console.error('decrypt failed.');
        }
      } catch (error) {
        console.error(`AES ECB failed: errCode: ${error.code}, message: ${error.message}`);
      }
    }
    ```