# 明文导入密钥(ArkTS)

分别以导入AES256、RSA2048和X25519密钥为例。具体的场景介绍及支持的算法规格，请参考密钥导入支持的算法。

#### 开发步骤

1.  指定密钥别名，密钥别名命名规范参考密钥生成介绍及算法规格。
    
2.  封装密钥属性集和密钥材料。
    
    *   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、HuksKeySize、HuksKeyPurpose属性。
    *   密钥材料须符合HUKS密钥材料格式，并以Uint8Array形式赋值给HuksOptions的inData字段。
3.  调用huks.importKeyItem，传入密钥别名和密钥属性集，即可导入密钥。
    
    HuksParam和HuksOptions的含义参考：HuksParam 和 HuksOptions
    

#### 导入AES256密钥

```
/* 以下以导入AES256密钥的Callback操作使用为例。 */
import { huks } from '@kit.UniversalKeystoreKit';
import { BusinessError } from '@kit.BasicServicesKit';

/* 密钥材料。 */
let plainTextSize32 = new Uint8Array([
  0xfb, 0x8b, 0x9f, 0x12, 0xa0, 0x83, 0x19, 0xbe, 0x6a, 0x6f, 0x63, 0x2a, 0x7c, 0x86, 0xba, 0xca,
  0x64, 0x0b, 0x88, 0x96, 0xe2, 0xfa, 0x77, 0xbc, 0x71, 0xe3, 0x0f, 0x0f, 0x9e, 0x3c, 0xe5, 0xf9
]);
/* 1.确定密钥别名。 */
let keyAlias = 'AES256Alias_sample';

/* 2.封装密钥属性集和密钥材料。 */
let properties: huks.HuksParam[] = [{
  tag: huks.HuksTag.HUKS_TAG_ALGORITHM,
  value: huks.HuksKeyAlg.HUKS_ALG_AES
}, {
  tag: huks.HuksTag.HUKS_TAG_KEY_SIZE,
  value: huks.HuksKeySize.HUKS_AES_KEY_SIZE_256
}, {
  tag: huks.HuksTag.HUKS_TAG_PURPOSE,
  value: huks.HuksKeyPurpose.HUKS_KEY_PURPOSE_ENCRYPT | huks.HuksKeyPurpose.HUKS_KEY_PURPOSE_DECRYPT
},
]
let options: huks.HuksOptions = {
  properties: properties,
  inData: plainTextSize32
};

/* 3.明文导入密钥。 */
async function importKeyItem(keyAlias: string, huksOptions: huks.HuksOptions): Promise<boolean> {
  console.info('promise: enter importKeyItem');
  let ret: boolean = false;
  try {
    await huks.importKeyItem(keyAlias, huksOptions)
      .then(() => {
        console.info(`promise: importKeyItem success`);
        ret = true;
      }).catch((error: BusinessError) => {
        console.error(`promise: importKeyItem failed errCode : ${error.code}, errMsg : ${error.message}`);
      })
  } catch (error) {
    console.error(`promise: importKeyItem input arg invalid`);
  }
  return ret;
}

async function testImport() {
  let retImp = await importKeyItem(keyAlias, options);
  if (retImp == false) {
    console.error(`testImport failed`);
    return;
  }
  console.info(`testImport success`);
}
```

#### 导入RSA2048密钥对

```
/* 以下以导入RSA2048密钥的Callback操作使用为例。 */
import { huks } from '@kit.UniversalKeystoreKit';
import { BusinessError } from '@kit.BasicServicesKit';

let rsa2048KeyPairMaterial = new Uint8Array([
  0x01, 0x00, 0x00, 0x00, // 密钥算法(小端表示)huks.HuksKeyAlg.HUKS_ALG_RSA = 1。
  0x00, 0x08, 0x00, 0x00, // 密钥大小（比特）：2048。
  0x00, 0x01, 0x00, 0x00, // 模数n长度（字节）：256。
  0x03, 0x00, 0x00, 0x00, // 公钥指数e长度（字节）：3。
  0x00, 0x01, 0x00, 0x00, // 私钥指数d长度（字节）：256。
  // 模数n。
  0xc5, 0x35, 0x62, 0x48, 0xc4, 0x92, 0x87, 0x73, 0x0d, 0x42, 0x96, 0xfc, 0x7b, 0x11, 0x05, 0x06,
  0x0f, 0x8d, 0x66, 0xc1, 0x0e, 0xad, 0x37, 0x44, 0x92, 0x95, 0x2f, 0x6a, 0x55, 0xba, 0xec, 0x1d,
  0x54, 0x62, 0x0a, 0x4b, 0xd3, 0xc7, 0x05, 0xe4, 0x07, 0x40, 0xd9, 0xb7, 0xc2, 0x12, 0xcb, 0x9a,
  0x90, 0xad, 0xe3, 0x24, 0xe8, 0x5e, 0xa6, 0xf8, 0xd0, 0x6e, 0xbc, 0xd1, 0x69, 0x7f, 0x6b, 0xe4,
  0x2b, 0x4e, 0x1a, 0x65, 0xbb, 0x73, 0x88, 0x6b, 0x7c, 0xaf, 0x7e, 0xd0, 0x47, 0x26, 0xeb, 0xa5,
  0xbe, 0xd6, 0xe8, 0xee, 0x9c, 0xa5, 0x66, 0xa5, 0xc9, 0xd3, 0x25, 0x13, 0xc4, 0x0e, 0x6c, 0xab,
  0x50, 0xb6, 0x50, 0xc9, 0xce, 0x8f, 0x0a, 0x0b, 0xc6, 0x28, 0x69, 0xe9, 0x83, 0x69, 0xde, 0x42,
  0x56, 0x79, 0x7f, 0xde, 0x86, 0x24, 0xca, 0xfc, 0xaa, 0xc0, 0xf3, 0xf3, 0x7f, 0x92, 0x8e, 0x8a,
  0x12, 0x52, 0xfe, 0x50, 0xb1, 0x5e, 0x8c, 0x01, 0xce, 0xfc, 0x7e, 0xf2, 0x4f, 0x5f, 0x03, 0xfe,
  0xa7, 0xcd, 0xa1, 0xfc, 0x94, 0x52, 0x00, 0x8b, 0x9b, 0x7f, 0x09, 0xab, 0xa8, 0xa4, 0xf5, 0xb4,
  0xa5, 0xaa, 0xfc, 0x72, 0xeb, 0x17, 0x40, 0xa9, 0xee, 0xbe, 0x8f, 0xc2, 0xd1, 0x80, 0xc2, 0x0d,
  0x44, 0xa9, 0x59, 0x44, 0x59, 0x81, 0x3b, 0x5d, 0x4a, 0xde, 0xfb, 0xae, 0x24, 0xfc, 0xa3, 0xd9,
  0xbc, 0x57, 0x55, 0xc2, 0x26, 0xbc, 0x19, 0xa7, 0x9a, 0xc5, 0x59, 0xa3, 0xee, 0x5a, 0xef, 0x41,
  0x80, 0x7d, 0xf8, 0x5e, 0xc1, 0x1d, 0x32, 0x38, 0x41, 0x5b, 0xb6, 0x92, 0xb8, 0xb7, 0x03, 0x0d,
  0x3e, 0x59, 0x0f, 0x1c, 0xb3, 0xe1, 0x2a, 0x95, 0x1a, 0x3b, 0x50, 0x4f, 0xc4, 0x1d, 0xcf, 0x73,
  0x7c, 0x14, 0xca, 0xe3, 0x0b, 0xa7, 0xc7, 0x1a, 0x41, 0x4a, 0xee, 0xbe, 0x1f, 0x43, 0xdd, 0xf9,
  // 公钥指数e。
  0x01, 0x00, 0x01,
  // 私钥指数d。
  0x88, 0x4b, 0x82, 0xe7, 0xe3, 0xe3, 0x99, 0x75, 0x6c, 0x9e, 0xaf, 0x17, 0x44, 0x3e, 0xd9, 0x07,
  0xfd, 0x4b, 0xae, 0xce, 0x92, 0xc4, 0x28, 0x44, 0x5e, 0x42, 0x79, 0x08, 0xb6, 0xc3, 0x7f, 0x58,
  0x2d, 0xef, 0xac, 0x4a, 0x07, 0xcd, 0xaf, 0x46, 0x8f, 0xb4, 0xc4, 0x43, 0xf9, 0xff, 0x5f, 0x74,
  0x2d, 0xb5, 0xe0, 0x1c, 0xab, 0xf4, 0x6e, 0xd5, 0xdb, 0xc8, 0x0c, 0xfb, 0x76, 0x3c, 0x38, 0x66,
  0xf3, 0x7f, 0x01, 0x43, 0x7a, 0x30, 0x39, 0x02, 0x80, 0xa4, 0x11, 0xb3, 0x04, 0xd9, 0xe3, 0x57,
  0x23, 0xf4, 0x07, 0xfc, 0x91, 0x8a, 0xc6, 0xcc, 0xa2, 0x16, 0x29, 0xb3, 0xe5, 0x76, 0x4a, 0xa8,
  0x84, 0x19, 0xdc, 0xef, 0xfc, 0xb0, 0x63, 0x33, 0x0b, 0xfa, 0xf6, 0x68, 0x0b, 0x08, 0xea, 0x31,
  0x52, 0xee, 0x99, 0xef, 0x43, 0x2a, 0xbe, 0x97, 0xad, 0xb3, 0xb9, 0x66, 0x7a, 0xae, 0xe1, 0x8f,
  0x57, 0x86, 0xe5, 0xfe, 0x14, 0x3c, 0x81, 0xd0, 0x64, 0xf8, 0x86, 0x1a, 0x0b, 0x40, 0x58, 0xc9,
  0x33, 0x49, 0xb8, 0x99, 0xc6, 0x2e, 0x94, 0x70, 0xee, 0x09, 0x88, 0xe1, 0x5c, 0x4e, 0x6c, 0x22,
  0x72, 0xa7, 0x2a, 0x21, 0xdd, 0xd7, 0x1d, 0xfc, 0x63, 0x15, 0x0b, 0xde, 0x06, 0x9c, 0xf3, 0x28,
  0xf3, 0xac, 0x4a, 0xa8, 0xb5, 0x50, 0xca, 0x9b, 0xcc, 0x0a, 0x04, 0xfe, 0x3f, 0x98, 0x68, 0x81,
  0xac, 0x24, 0x53, 0xea, 0x1f, 0x1c, 0x6e, 0x5e, 0xca, 0xe8, 0x31, 0x0d, 0x08, 0x12, 0xf3, 0x26,
  0xf8, 0x5e, 0xeb, 0x10, 0x27, 0xae, 0xaa, 0xc3, 0xad, 0x6c, 0xc1, 0x89, 0xdb, 0x7d, 0x5a, 0x12,
  0x55, 0xad, 0x11, 0x19, 0xa1, 0xa9, 0x8f, 0x0b, 0x6d, 0x78, 0x8d, 0x1c, 0xdf, 0xe5, 0x63, 0x82,
  0x0b, 0x7d, 0x23, 0x04, 0xb4, 0x75, 0x8c, 0xed, 0x77, 0xfc, 0x1a, 0x85, 0x29, 0x11, 0xe0, 0x61,
]);

/* 1.确定密钥别名。 */
let keyAlias = 'RSA_sample';
/* 2.封装密钥属性集和密钥材料。 */
let properties: huks.HuksParam[] = [{
  tag: huks.HuksTag.HUKS_TAG_ALGORITHM,
  value: huks.HuksKeyAlg.HUKS_ALG_RSA
}, {
  tag: huks.HuksTag.HUKS_TAG_KEY_SIZE,
  value: huks.HuksKeySize.HUKS_RSA_KEY_SIZE_2048
}, {
  // 此tag表示密钥导入后的用途，导入后将不可更改。
  tag: huks.HuksTag.HUKS_TAG_PURPOSE,
  value: huks.HuksKeyPurpose.HUKS_KEY_PURPOSE_ENCRYPT | huks.HuksKeyPurpose.HUKS_KEY_PURPOSE_DECRYPT
}, {
  // 此tag表示需导入的密钥类型。
  tag: huks.HuksTag.HUKS_TAG_IMPORT_KEY_TYPE,
  // 此value表示导入密钥对，若改为HUKS_KEY_TYPE_PUBLIC_KEY时表示仅导入公钥。
  value: huks.HuksImportKeyType.HUKS_KEY_TYPE_KEY_PAIR
}
]
let options: huks.HuksOptions = {
  properties: properties,
  inData: rsa2048KeyPairMaterial
};

/* 3.明文导入密钥。 */
async function importKeyItem(keyAlias: string, huksOptions: huks.HuksOptions): Promise<boolean> {
  console.info('promise: enter importKeyItem');
  let ret: boolean = false;
  try {
    await huks.importKeyItem(keyAlias, huksOptions)
      .then(() => {
        console.info(`promise: importKeyItem success`);
        ret = true;
      }).catch((error: BusinessError) => {
        console.error(`promise: importKeyItem failed errCode : ${error.code}, errMsg : ${error.message}`);
      })
  } catch (error) {
    console.error(`promise: importKeyItem input arg invalid`);
  }
  return ret;
}

async function testImport() {
  let retImp = await importKeyItem(keyAlias, options);
  if (retImp == false) {
    console.error(`testImport failed`);
    return;
  }
  console.info(`testImport success`);
}
```

#### 导入X25519密钥公钥

```
/* 以下以导入X25519密钥的Callback操作使用为例。 */
import { huks } from '@kit.UniversalKeystoreKit';
import { BusinessError } from '@kit.BasicServicesKit';

// X25519的公钥数据。X25519密钥对中的私钥和公钥都是32字节（256位），关于算法原理请自行参考相关密码学资料。
let x25519KeyPubMaterial = new Uint8Array([
  0x30, 0x2A, 0x30, 0x05, 0x06, 0x03, 0x2B, 0x65, 0x6E, 0x03, 0x21, 0x00, 0xD2, 0x36, 0x9E, 0xCF,
  0xF0, 0x61, 0x5B, 0x73, 0xCE, 0x4F, 0xF0, 0x40, 0x2B, 0x89, 0x18, 0x3E, 0x06, 0x33, 0x60, 0xC6
]);

/* 1.确定密钥别名。 */
let keyAlias = 'X25519_Pub_import_sample';
/* 2.封装密钥属性集和密钥材料。 */
let properties: huks.HuksParam[] = [{
  tag: huks.HuksTag.HUKS_TAG_ALGORITHM,
  value: huks.HuksKeyAlg.HUKS_ALG_X25519
}, {
  tag: huks.HuksTag.HUKS_TAG_KEY_SIZE,
  value: huks.HuksKeySize.HUKS_CURVE25519_KEY_SIZE_256
}, {
  // 此tag表示密钥导入后的用途，导入后将不可更改。
  tag: huks.HuksTag.HUKS_TAG_PURPOSE,
  value: huks.HuksKeyPurpose.HUKS_KEY_PURPOSE_VERIFY
}, {
  // 此tag表示需导入的密钥类型。
  tag: huks.HuksTag.HUKS_TAG_IMPORT_KEY_TYPE,
  // 此value表示导入密钥的公钥，若改为HUKS_KEY_TYPE_KEY_PAIR时表示导入密钥对。
  value: huks.HuksImportKeyType.HUKS_KEY_TYPE_PUBLIC_KEY
},
]
let options: huks.HuksOptions = {
  properties: properties,
  inData: x25519KeyPubMaterial
};

/* 3.明文导入密钥。 */
async function importKeyItem(keyAlias: string, huksOptions: huks.HuksOptions): Promise<boolean> {
  console.info('promise: enter importKeyItem');
  let ret: boolean = false;
  try {
    await huks.importKeyItem(keyAlias, huksOptions)
      .then(() => {
        console.info(`promise: importKeyItem success`);
        ret = true;
      }).catch((error: BusinessError) => {
        console.error(`promise: importKeyItem failed errCode : ${error.code}, errMsg : ${error.message}`);
      })
  } catch (error) {
    console.error(`promise: importKeyItem input arg invalid`);
  }
  return ret;
}

async function testImport() {
  let retImp = await importKeyItem(keyAlias, options);
  if (retImp == false) {
    console.error(`testImport failed`);
    return;
  }
  console.info(`testImport success`);
}
```

#### 调测验证

调用huks.isKeyItemExist验证密钥是否存在，如密钥存在即表示密钥导入成功。

```
import { huks } from '@kit.UniversalKeystoreKit';
import { BusinessError } from "@kit.BasicServicesKit";

let keyAlias = 'AES256Alias_sample';
let keyProperties: Array<huks.HuksParam> = [{
    tag: huks.HuksTag.HUKS_TAG_ALGORITHM,
    value: huks.HuksKeyAlg.HUKS_ALG_AES
  }
]
let huksOptions: huks.HuksOptions = {
  properties: keyProperties, // 非空填充。
  inData: new Uint8Array(new Array()) // 非空填充。
}

async function isKeyItemExist(keyAlias: string, options: huks.HuksOptions): Promise<boolean> {
  console.info(`promise: enter isKeyItemExist success`);
  let ret: boolean = false;
  try {
    await huks.isKeyItemExist(keyAlias, options)
      .then((data) => {
        console.info(`promise: isKeyItemExist success, data = ${data}`);
        ret = true;
      }).catch((error: BusinessError) => {
        console.error(`promise: isKeyItemExist success, errCode : ${error.code}, errMsg : ${error.message}`);
      })
  } catch (error) {
    console.error(`promise: isKeyItemExist input arg invalid`);
  }
  return ret;
}

async function testImportKeyExist() {
  let retExist = await isKeyItemExist(keyAlias, huksOptions);
  if (retExist == false) {
    console.error(`testImportKeyExist failed`);
    return;
  }
  console.info(`testImportKeyExist success`);
}
```