1# 使用AES对称密钥（ECB模式）加解密(ArkTS)
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4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)。
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6
7**加密**
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101. 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）。
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12   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。
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142. 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，用于完成加解密操作。
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163. 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）和ECB模式对应的加密参数（IvParamsSpec），初始化加密Cipher实例。
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184. 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。
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21**解密**
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241. 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）和ECB模式对应的解密参数（IvParamsSpec），初始化解密Cipher实例。
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262. 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。
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29- 异步方法示例：
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31  ```ts
32  import { cryptoFramework } from '@kit.CryptoArchitectureKit';
33  import { buffer } from '@kit.ArkTS';
34
35  // 加密消息
36  async function encryptMessagePromise(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
37    let cipher = cryptoFramework.createCipher('AES128|ECB|PKCS7');
38    await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, null);
39    let cipherData = await cipher.doFinal(plainText);
40    return cipherData;
41  }
42  // 解密消息
43  async function decryptMessagePromise(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
44    let decoder = cryptoFramework.createCipher('AES128|ECB|PKCS7');
45    await decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, null);
46    let decryptData = await decoder.doFinal(cipherText);
47    return decryptData;
48  }
49
50  async function genSymKeyByData(symKeyData: Uint8Array) {
51    let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
52    let aesGenerator = cryptoFramework.createSymKeyGenerator('AES128');
53    let symKey = await aesGenerator.convertKey(symKeyBlob);
54    console.info('convertKey success');
55    return symKey;
56  }
57
58  async function aesECB() {
59    try {
60      let keyData = new Uint8Array([83, 217, 231, 76, 28, 113, 23, 219, 250, 71, 209, 210, 205, 97, 32, 159]);
61      let symKey = await genSymKeyByData(keyData);
62      let message = "This is a test";
63      let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
64      let encryptText = await encryptMessagePromise(symKey, plainText);
65      let decryptText = await decryptMessagePromise(symKey, encryptText);
66      if (plainText.data.toString() === decryptText.data.toString()) {
67        console.info('decrypt ok');
68        console.info('decrypt plainText: ' + buffer.from(decryptText.data).toString('utf-8'));
69      } else {
70        console.error('decrypt failed');
71      }
72    } catch (error) {
73      console.error(`AES ECB “${error}“, error code: ${error.code}`);
74    }
75  }
76  ```
77
78- 同步方法示例：
79
80  ```ts
81  import { cryptoFramework } from '@kit.CryptoArchitectureKit';
82  import { buffer } from '@kit.ArkTS';
83
84  // 加密消息
85  function encryptMessage(symKey: cryptoFramework.SymKey, plainText: cryptoFramework.DataBlob) {
86    let cipher = cryptoFramework.createCipher('AES128|ECB|PKCS7');
87    cipher.initSync(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, null);
88    let cipherData = cipher.doFinalSync(plainText);
89    return cipherData;
90  }
91  // 解密消息
92  function decryptMessage(symKey: cryptoFramework.SymKey, cipherText: cryptoFramework.DataBlob) {
93    let decoder = cryptoFramework.createCipher('AES128|ECB|PKCS7');
94    decoder.initSync(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, null);
95    let decryptData = decoder.doFinalSync(cipherText);
96    return decryptData;
97  }
98
99  function genSymKeyByData(symKeyData: Uint8Array) {
100    let symKeyBlob: cryptoFramework.DataBlob = { data: symKeyData };
101    let aesGenerator = cryptoFramework.createSymKeyGenerator('AES128');
102    let symKey = aesGenerator.convertKeySync(symKeyBlob);
103    console.info('convertKeySync success');
104    return symKey;
105  }
106
107  function main() {
108    try {
109      let keyData = new Uint8Array([83, 217, 231, 76, 28, 113, 23, 219, 250, 71, 209, 210, 205, 97, 32, 159]);
110      let symKey = genSymKeyByData(keyData);
111      let message = "This is a test";
112      let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
113      let encryptText = encryptMessage(symKey, plainText);
114      let decryptText = decryptMessage(symKey, encryptText);
115      if (plainText.data.toString() === decryptText.data.toString()) {
116        console.info('decrypt ok');
117        console.info('decrypt plainText: ' + buffer.from(decryptText.data).toString('utf-8'));
118      } else {
119        console.error('decrypt failed');
120      }
121    } catch (error) {
122      console.error(`AES ECB “${error}“, error code: ${error.code}`);
123    }
124  }
125  ```