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1# 明文导入密钥(ArkTS)
2
3
4以导入AES256密钥为例，具体的场景介绍及支持的算法规格，请参考[密钥导入的支持的算法](huks-key-import-overview.md#支持的算法)。
5
6
7## 开发步骤
8
91. 指定密钥别名keyAlias。
10   密钥别名的最大长度为64字节。
11
122. 封装密钥属性集和密钥材料。
13   - 密钥属性集同样与密钥生成中指定的密钥属性一致，须包含[HuksKeyAlg](../../reference/apis-universal-keystore-kit/js-apis-huks.md#hukskeyalg)、[HuksKeySize](../../reference/apis-universal-keystore-kit/js-apis-huks.md#hukskeysize)、[HuksKeyPurpose](../../reference/apis-universal-keystore-kit/js-apis-huks.md#hukskeypurpose)属性。
14   - 密钥材料须符合[HUKS密钥材料格式](huks-concepts.md#密钥材料格式)，并以Uint8Array形式赋值给[HuksOptions](../../reference/apis-universal-keystore-kit/js-apis-huks.md#huksoptions)的inData字段。
15
163. 调用[huks.importKeyItem](../../reference/apis-universal-keystore-kit/js-apis-huks.md#huksimportkeyitem9)，传入密钥别名和密钥属性集，即可导入密钥。
17
18```ts
19/* 以下以导入AES256密钥的Callback操作使用为例 */
20import huks from '@ohos.security.huks'
21/* 密钥材料 */
22let plainTextSize32 = new Uint8Array([
23    0xfb, 0x8b, 0x9f, 0x12, 0xa0, 0x83, 0x19, 0xbe, 0x6a, 0x6f, 0x63, 0x2a, 0x7c, 0x86, 0xba, 0xca,
24    0x64, 0x0b, 0x88, 0x96, 0xe2, 0xfa, 0x77, 0xbc, 0x71, 0xe3, 0x0f, 0x0f, 0x9e, 0x3c, 0xe5, 0xf9
25]);
26/* 1.确定密钥别名 */
27let keyAlias = 'AES256Alias_sample';
28/* 2.封装密钥属性集和密钥材料 */
29class propertyType {
30    tag: huks.HuksTag = huks.HuksTag.HUKS_TAG_ALGORITHM;
31    value: huks.HuksKeyAlg | huks.HuksKeySize | huks.HuksKeyPurpose = huks.HuksKeyAlg.HUKS_ALG_RSA;
32}
33let properties: propertyType[] = [
34    {
35        tag: huks.HuksTag.HUKS_TAG_ALGORITHM,
36        value:huks.HuksKeyAlg.HUKS_ALG_AES
37    },
38    {
39        tag: huks.HuksTag.HUKS_TAG_KEY_SIZE,
40        value: huks.HuksKeySize.HUKS_AES_KEY_SIZE_256
41    },
42    {
43        tag: huks.HuksTag.HUKS_TAG_PURPOSE,
44        value: huks.HuksKeyPurpose.HUKS_KEY_PURPOSE_ENCRYPT | huks.HuksKeyPurpose.HUKS_KEY_PURPOSE_DECRYPT
45    },
46]
47let options: huks.HuksOptions = {
48    properties: properties,
49    inData: plainTextSize32
50};
51/* 3.明文导入密钥 */
52try {
53    huks.importKeyItem(keyAlias, options, (error, data) => {
54        if (error) {
55            console.error(`callback: importKeyItem failed` + error);
56        } else {
57            console.info(`callback: importKeyItem success`);
58        }
59    });
60} catch (error) {
61    console.error(`callback: importKeyItem input arg invalid` + error);
62}
63```
64
65
66## 调测验证
67
68调用[huks.isKeyItemExist](../../reference/apis-universal-keystore-kit/js-apis-huks.md#huksiskeyitemexist9)验证密钥是否存在，如密钥存在即表示密钥导入成功。
69
70```ts
71import huks from '@ohos.security.huks';
72let keyAlias = 'AES256Alias_sample';
73let isKeyExist = false;
74class keyPropertyType {
75    tag: huks.HuksTag = huks.HuksTag.HUKS_TAG_ALGORITHM;
76    value: huks.HuksKeyAlg = huks.HuksKeyAlg.HUKS_ALG_RSA;
77}
78let keyProperties: keyPropertyType[] = [
79    {
80        tag: huks.HuksTag.HUKS_TAG_ALGORITHM,
81        value: huks.HuksKeyAlg.HUKS_ALG_AES
82    },
83]
84let huksOptions: huks.HuksOptions = {
85    properties: keyProperties, // 非空填充
86    inData: new Uint8Array(new Array()) // 非空填充
87}
88try {
89    huks.isKeyItemExist(keyAlias, huksOptions, (error, data) => {
90        if (error) {
91            console.error(`callback: isKeyItemExist failed` + error);
92        } else {
93            if (data !== null && data.valueOf() !== null) {
94                isKeyExist = data.valueOf();
95                console.info(`callback: isKeyItemExist success, isKeyExist = ${isKeyExist}`);
96            }
97        }
98    });
99} catch (error) {
100    console.error(`callback: isKeyItemExist input arg invalid` + error);
101}
102```
103