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1# 使用AES对称密钥（ECB模式）加解密(ArkTS)
2
3对应的算法规格请查看[对称密钥加解密算法规格：AES](crypto-sym-encrypt-decrypt-spec.md#aes)。
4
5**加密**
6
71. 调用[cryptoFramework.createSymKeyGenerator](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#cryptoframeworkcreatesymkeygenerator)、[SymKeyGenerator.generateSymKey](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#generatesymkey-1)，生成密钥算法为AES、密钥长度为128位的对称密钥（SymKey）。
8
9   如何生成AES对称密钥，开发者可参考下文示例，并结合[对称密钥生成和转换规格：AES](crypto-sym-key-generation-conversion-spec.md#aes)和[随机生成对称密钥](crypto-generate-sym-key-randomly.md)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。
10
112. 调用[cryptoFramework.createCipher](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#cryptoframeworkcreatecipher)，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。
12
133. 调用[Cipher.init](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#init-1)，设置模式为加密（CryptoMode.ENCRYPT_MODE），指定加密密钥（SymKey），ECB模式Params为空，初始化加密Cipher实例。
14
154. 加密内容较短时，可以不调用update，直接调用[Cipher.doFinal](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#dofinal-1)，获取加密后的数据。
16
17**解密**
18
191. 调用[cryptoFramework.createCipher](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#cryptoframeworkcreatecipher)，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。
20
212. 调用[Cipher.init](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#init-1)，设置模式为解密（CryptoMode.DECRYPT_MODE），指定解密密钥（SymKey），ECB模式Params为空，初始化解密Cipher实例。
22
233. 解密内容较短时，可以不调用update，直接调用[Cipher.doFinal](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#dofinal-1)，获取解密后的数据。
24
25- 异步方法示例：
26
27  ```ts
28  import { cryptoFramework } from '@kit.CryptoArchitectureKit';
29  import { buffer } from '@kit.ArkTS';
30
31  // 加密消息。
32  async function encryptMessagePromise(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
33    let cipher = cryptoFramework.createCipher('AES128|ECB|PKCS7');
34    await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, null); // ECB模式params为null。
35    let cipherData = await cipher.doFinal(plainText);
36    return cipherData;
37  }
38  // 解密消息。
39  async function decryptMessagePromise(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
40    let decoder = cryptoFramework.createCipher('AES128|ECB|PKCS7');
41    await decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, null); // ECB模式params为null。
42    let decryptData = await decoder.doFinal(cipherText);
43    return decryptData;
44  }
45
46  async function genSymKeyByData(symKeyData: Uint8Array) {
47    let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
48    let aesGenerator = cryptoFramework.createSymKeyGenerator('AES128');
49    let symKey = await aesGenerator.convertKey(symKeyBlob);
50    console.info('convertKey success');
51    return symKey;
52  }
53
54  async function aesECB() {
55    try {
56      let keyData = new Uint8Array([83, 217, 231, 76, 28, 113, 23, 219, 250, 71, 209, 210, 205, 97, 32, 159]);
57      let symKey = await genSymKeyByData(keyData);
58      let message = "This is a test";
59      let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
60      let encryptText = await encryptMessagePromise(symKey, plainText);
61      let decryptText = await decryptMessagePromise(symKey, encryptText);
62      if (plainText.data.toString() === decryptText.data.toString()) {
63        console.info('decrypt ok');
64        console.info('decrypt plainText: ' + buffer.from(decryptText.data).toString('utf-8'));
65      } else {
66        console.error('decrypt failed');
67      }
68    } catch (error) {
69      console.error(`AES ECB “${error}“, error code: ${error.code}`);
70    }
71  }
72  ```
73
74- 同步方法示例：
75
76  ```ts
77  import { cryptoFramework } from '@kit.CryptoArchitectureKit';
78  import { buffer } from '@kit.ArkTS';
79
80  // 加密消息。
81  function encryptMessage(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
82    let cipher = cryptoFramework.createCipher('AES128|ECB|PKCS7');
83    cipher.initSync(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, null); // ECB模式params为null。
84    let cipherData = cipher.doFinalSync(plainText);
85    return cipherData;
86  }
87  // 解密消息。
88  function decryptMessage(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
89    let decoder = cryptoFramework.createCipher('AES128|ECB|PKCS7');
90    decoder.initSync(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, null); // ECB模式params为null。
91    let decryptData = decoder.doFinalSync(cipherText);
92    return decryptData;
93  }
94
95  function genSymKeyByData(symKeyData: Uint8Array) {
96    let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
97    let aesGenerator = cryptoFramework.createSymKeyGenerator('AES128');
98    let symKey = aesGenerator.convertKeySync(symKeyBlob);
99    console.info('convertKeySync success');
100    return symKey;
101  }
102
103  function main() {
104    try {
105      let keyData = new Uint8Array([83, 217, 231, 76, 28, 113, 23, 219, 250, 71, 209, 210, 205, 97, 32, 159]);
106      let symKey = genSymKeyByData(keyData);
107      let message = "This is a test";
108      let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
109      let encryptText = encryptMessage(symKey, plainText);
110      let decryptText = decryptMessage(symKey, encryptText);
111      if (plainText.data.toString() === decryptText.data.toString()) {
112        console.info('decrypt ok');
113        console.info('decrypt plainText: ' + buffer.from(decryptText.data).toString('utf-8'));
114      } else {
115        console.error('decrypt failed');
116      }
117    } catch (error) {
118      console.error(`AES ECB “${error}“, error code: ${error.code}`);
119    }
120  }
121  ```