鸿蒙系统开发【加解密算法库框架】安全

加解密算法库框架

介绍

本示例使用@ohos.security.cryptoFramework相关接口实现了对文本文件的加解密、签名验签操作。

实现场景如下：

1）软件需要加密存储本地文本文件，需要调用加解密算法库框架选择密钥文本文件，对本地文本文件进行加密，其中密钥文本文件可由加解密算法库生成。

2）软件需要解密存储本地文本文件，需要调用加解密算法库框架选择密钥文本文件，对本地文本文件进行解密，其中密钥文本文件可由加解密算法库生成。

3）软件需要对存储本地文本文件签名，调用加解密算法库框架选择密钥文本文件，对本地文本文件进行完整性签名，其中密钥文本文件可由加解密算法库生成。

4）软件需要验证存储本地文本文件的签名完整性，需要调用加解密算法库框架选择密钥文本文件与签名文件，对文件进行验签，其中密钥文本文件可由加解密算法库生成。

效果预览

使用说明

1.点击主页面tab栏的加密，在加密界面点击打开文件，通过文件选择器选择文本文件，选择完毕自动返回加密界面， 其内容显示在文件内容文本框中， 点击选择密钥，选择密钥文件，如果没有密钥文件，可以通过在加密界面点击随机生成AES密钥，生成并通过文件选择器保存密钥文件。 选择完文本文件和密钥文件后，点击加密按钮，完成加密，并通过文件选择器保存密文文件。 下方加密内容文本框中显示加密后的消息内容。

2.点击主页面tab栏的解密，在解密界面点击打开文件，通过文件选择器选择文本文件，选择完毕自动返回解密界面， 其内容显示在文件内容文本框中， 点击选择密钥，选择和加密相同的密钥文件。 选择完文本文件和密钥文件后，点击解密按钮，完成解密，并通过文件选择器保存明文文件。 下方解密内容文本框中显示解密后的消息内容。

3.点击主页面tab栏的签名，在签名界面点击打开文件，通过文件选择器选择文本文件，选择完毕自动返回签名界面， 其内容显示在文件内容文本框中， 点击选择密钥，选择密钥文件，如果没有密钥文件，可以通过在签名界面点击随机生成RSA密钥，生成并通过文件选择器保存密钥文件，注意RSA密钥生成耗时较长。 选择完文本文件和密钥文件后，点击签名按钮，完成完整性签名，并通过文件选择器保存签名文件。

4.点击主页面tab栏的验签，在验签界面点击打开文件，通过文件选择器选择文本文件，选择完毕自动返回验签界面， 其内容显示在文件内容文本框中， 点击选择密钥，选择和签名一致的密钥文件。点击选择签名文件，通过文件选择器选择签名时保存的签名文件， 选择完文本文件、密钥文件和签名文件后，点击验签按钮，完成验签。

具体实现

• 进行对文本文件进行加解密、签名验签的功能接口封装在CryptoOperation中，源码参考：[CryptoOperation.ts]

/** Copyright (c) 2023 Huawei Device Co., Ltd.* Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**     http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/import { cryptoFramework } from '@kit.CryptoArchitectureKit';
import Logger from '../util/Logger';const TAG: string = '[Crypto_Framework]';
const BASE_16: number = 16;
const SLICE_NUMBER: number = -2;// 字节流以16进制字符串输出
function uint8ArrayToShowStr(uint8Array: Uint8Array): string {let ret: string = Array.prototype.map.call(uint8Array, (x) => ('00' + x.toString(BASE_16)).slice(SLICE_NUMBER)).join('');return ret;
}// 16进制字符串转字节流
function fromHexString(hexString: string): Uint8Array {let ret: Uint8Array = new Uint8Array(hexString.match(/.{1,2}/g).map(byte => parseInt(byte, BASE_16)));return ret;
}// 字节流转字符串
function arrayBufferToString(buffer: ArrayBuffer): string {let ret: string = String.fromCharCode.apply(null, new Uint8Array(buffer));return ret;
}// 可理解的字符串转成字节流
function stringToUint8Array(str: string): Uint8Array {let arr = [];for (let i = 0, j = str.length; i < j; ++i) {arr.push(str.charCodeAt(i));}let ret: Uint8Array = new Uint8Array(arr);return ret;
}function genGcmParamsSpec(): cryptoFramework.GcmParamsSpec {let arr = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]; // 12 byteslet dataIv = new Uint8Array(arr);let ivBlob = { data: dataIv };arr = [0, 0, 0, 0, 0, 0, 0, 0]; // 8 byteslet dataAad = new Uint8Array(arr);let aadBlob = { data: dataAad };arr = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]; // 16 byteslet dataTag = new Uint8Array(arr);let tagBlob = { data: dataTag }; // GCM的authTag在加密时从doFinal结果中获取，在解密时填入init函数的params参数中let gcmParamsSpec = { iv: ivBlob, aad: aadBlob, authTag: tagBlob, algName: 'GcmParamsSpec' };return gcmParamsSpec;
}export class CryptoOperation {async generateAesKey(): Promise<string> {let symKeyGenerator;let encodedKey;// 创建对称密钥生成器try {symKeyGenerator = cryptoFramework.createSymKeyGenerator('AES256');} catch (error) {Logger.error(TAG, 'create generator failed');return null;}// 通过密钥生成器随机生成对称密钥try {let symKey = await symKeyGenerator.generateSymKey();// 获取对称密钥的二进制数据，输出长度为256bit的字节流encodedKey = symKey.getEncoded();let data: Uint8Array = encodedKey.data;Logger.info('success, key bytes: ' + data);Logger.info('success, key hex:' + uint8ArrayToShowStr(data));// 将二进制数据转为16进制string。return uint8ArrayToShowStr(data);} catch (error) {Logger.error(TAG, 'create symKey failed');return null;}}async convertAesKey(aesKeyBlobString: string): Promise<cryptoFramework.SymKey> {let symKeyGenerator = cryptoFramework.createSymKeyGenerator('AES256');Logger.info(TAG, 'success, read key string' + aesKeyBlobString);Logger.info(TAG, 'success, blob key ' + fromHexString(aesKeyBlobString));let symKeyBlob = { data: fromHexString(aesKeyBlobString) };try {let key = await symKeyGenerator.convertKey(symKeyBlob);let aesKey: cryptoFramework.SymKey = key;return aesKey;} catch (error) {Logger.error(TAG, `convert aes key failed, ${error.code}, ${error.message}`);return null;}}async aesGcmEncrypt(globalKey, textString: string): Promise<string> {let cipherAlgName = 'AES256|GCM|PKCS7';let cipher;let cipherText: string;let globalGcmParams = genGcmParamsSpec();let aesEncryptJsonStr = null;try {cipher = cryptoFramework.createCipher(cipherAlgName);Logger.info(TAG, `cipher algName: ${cipher.algName}`);} catch (error) {Logger.error(TAG, `createCipher failed, ${error.code}, ${error.message}`);return aesEncryptJsonStr;}let mode = cryptoFramework.CryptoMode.ENCRYPT_MODE;try {await cipher.init(mode, globalKey, globalGcmParams);} catch (error) {Logger.error(TAG, `init cipher failed, ${error.code}, ${error.message}`);return aesEncryptJsonStr;}let plainText = { data: stringToUint8Array(textString) };Logger.info(TAG, `plain text: ${plainText.data}`);try {let cipherTextBlob = await cipher.update(plainText);let tmpArr: Uint8Array = cipherTextBlob.data;cipherText = uint8ArrayToShowStr(tmpArr);Logger.info(TAG, `cipher text: ${cipherText}`);} catch (error) {Logger.error(TAG, `update cipher failed, ${error.code}, ${error.message}`);return aesEncryptJsonStr;}try {let authTag = await cipher.doFinal(null);let tmoTagArr: Uint8Array = authTag.data;let aesEncryptJson = ({ aesGcmTag: uint8ArrayToShowStr(tmoTagArr), encryptedText: cipherText });aesEncryptJsonStr = JSON.stringify(aesEncryptJson);Logger.info(TAG, `success, authTag blob ${authTag.data}`);Logger.info(TAG, `success, authTag blob.length = ${authTag.data.length}`);return aesEncryptJsonStr;} catch (error) {Logger.error(TAG, `doFinal cipher failed, ${error.code}, ${error.message}`);return aesEncryptJsonStr;}}async aesGcmDecrypt(globalKey, aesEncryptJsonStr: string): Promise<string> {let cipherAlgName = 'AES256|GCM|PKCS7';let decode;let plainTextBlob;let plainText: string;let aesEncryptJson;try {aesEncryptJson = JSON.parse(aesEncryptJsonStr);} catch (error) {Logger.error(TAG, `trans from json string failed, ${error.code}, ${error.message}`);return null;}let authTagStr: string = aesEncryptJson.aesGcmTag;let textString: string = aesEncryptJson.encryptedText;let globalGcmParams = genGcmParamsSpec();globalGcmParams.authTag = { data: fromHexString(authTagStr) };Logger.info(TAG, 'success, decrypt authTag string' + authTagStr);Logger.info(TAG, 'success, decrypt authTag blob' + globalGcmParams.authTag.data);Logger.info(TAG, 'success, decrypt authTag blob.length = ' + globalGcmParams.authTag.data.length);try {decode = cryptoFramework.createCipher(cipherAlgName);} catch (error) {Logger.error(TAG, `createCipher failed, ${error.code}, ${error.message}`);return null;}let mode = cryptoFramework.CryptoMode.DECRYPT_MODE;try {await decode.init(mode, globalKey, globalGcmParams);} catch (error) {Logger.error(TAG, `init decode failed, ${error.code}, ${error.message}`);return null;}let cipherText = { data: fromHexString(textString) };Logger.info(TAG, `success, cipher text: ${cipherText.data}`);try {plainTextBlob = await decode.update(cipherText);let tmpArr: Uint8Array = plainTextBlob.data;plainText = arrayBufferToString(tmpArr);Logger.info(TAG, `success, plain text: ${plainText}`);} catch (error) {Logger.error(TAG, `update decode failed, ${error.code}, ${error.message}`);return null;}try {let finalOut = await decode.doFinal(null);} catch (error) {Logger.error(TAG, `doFinal decode failed, ${error.code}, ${error.message}`);return null;}return plainText;}async aesConvertAndEncrypt(aesKeyBlobString: string, textString: string): Promise<string> {let aesEncryptJsonStr = '';try {let key = await this.convertAesKey(aesKeyBlobString);try {aesEncryptJsonStr = await this.aesGcmEncrypt(key, textString);} catch (error) {Logger.error(TAG, `encrypt error, ${error.code}, ${error.message}`);}} catch (error) {Logger.error(TAG, `convert key error, ${error.code}, ${error.message}`);return null;}return aesEncryptJsonStr;}async aesConvertAndDecrypt(aesKeyBlobString: string, textString: string): Promise<string> {let plainText = '';try {let key = await this.convertAesKey(aesKeyBlobString);try {plainText = await this.aesGcmDecrypt(key, textString);} catch (error) {Logger.error(TAG, `encrypt error, ${error.code}, ${error.message}`);}} catch (error) {Logger.error(TAG, `convert key error, ${error.code}, ${error.message}`);return null;}return plainText;}async generateRsaKey(): Promise<string> {// 创建非对称密钥生成器let rsaKeyGenerator;let jsonStr;// 创建对称密钥生成器try {rsaKeyGenerator = cryptoFramework.createAsyKeyGenerator('RSA3072');} catch (error) {Logger.error(TAG, 'create generator failed');return null;}// 通过密钥生成器随机生成非对称密钥try {// 通过密钥生成器随机生成非对称密钥let keyPair = await rsaKeyGenerator.generateKeyPair();// 获取非对称密钥的二进制数据let encodedPriKey = keyPair.priKey.getEncoded();let priKeyData: Uint8Array = encodedPriKey.data;let encodedPubKey = keyPair.pubKey.getEncoded();let pubKeyData: Uint8Array = encodedPubKey.data;let rsaKeyJson = ({ priKey: uint8ArrayToShowStr(priKeyData), pubKey: uint8ArrayToShowStr(pubKeyData) });jsonStr = JSON.stringify(rsaKeyJson);Logger.info(TAG, 'success, key string: ' + jsonStr.length);return jsonStr;} catch (error) {Logger.error(TAG, 'create symKey failed');return null;}}async convertRsaKey(rsaJsonString: string): Promise<cryptoFramework.KeyPair> {let rsaKeyGenerator = cryptoFramework.createAsyKeyGenerator('RSA3072');Logger.info(TAG, 'success, read key string' + rsaJsonString.length);let jsonRsaKeyBlob;try {jsonRsaKeyBlob = JSON.parse(rsaJsonString);} catch (error) {Logger.error(TAG, `trans from json string failed, ${error.code}, ${error.message}`);return null;}let priKeyStr: string = jsonRsaKeyBlob.priKey;let pubKeyStr: string = jsonRsaKeyBlob.pubKey;Logger.info(TAG, 'success, read rsa pri str ' + priKeyStr.length);Logger.info(TAG, 'success, read rsa pub str ' + pubKeyStr.length);let priKeyBlob = fromHexString(priKeyStr);let pubKeyBlob = fromHexString(pubKeyStr);Logger.info(TAG, 'success, read rsa pri blob key ' + priKeyBlob.length);Logger.info(TAG, 'success, read rsa pub blob key ' + pubKeyBlob.length);try {let key: cryptoFramework.KeyPair = await rsaKeyGenerator.convertKey({ data: pubKeyBlob }, { data: priKeyBlob });return key;Logger.info(TAG, 'success, read and convert key');} catch (error) {Logger.error(TAG, `convert rsa key failed, ${error.code}, ${error.message}`);return null;}}async rsaSign(globalKey, textString: string): Promise<string> {let signer = cryptoFramework.createSign('RSA3072|PKCS1|SHA256');let keyPair = globalKey;try {await signer.init(keyPair.priKey);let signBlob = stringToUint8Array(textString);try {let signedBlob = await signer.sign({ data: signBlob });let tmpArr: Uint8Array = signedBlob.data;Logger.info(TAG, 'success,RSA sign output is' + signedBlob.data.length);let rsaSignedBlobString = uint8ArrayToShowStr(tmpArr);Logger.info(TAG, 'success,RSA sign string is' + rsaSignedBlobString);return rsaSignedBlobString;} catch (error1) {Logger.error(TAG, `sign text failed, ${error1.code}, ${error1.message}`);return null;}} catch (error) {Logger.error(TAG, `sign init failed, ${error.code}, ${error.message}`);return null;}}async rsaVerify(globalKey, textString: string, rsaSignedText: string): Promise<Boolean> {let verifyer = cryptoFramework.createVerify('RSA3072|PKCS1|SHA256');let keyPair = globalKey;let signBlob = stringToUint8Array(textString);let signedBlob = fromHexString(rsaSignedText);Logger.info('success,RSA sign input is ' + signBlob);Logger.info('success,RSA signed file length ' + signedBlob.length);try {await verifyer.init(keyPair.pubKey);try {let result: Boolean = await verifyer.verify({ data: signBlob }, { data: signedBlob });if (result === false) {// flag = false;Logger.error(TAG, 'RSA Verify result = fail');} else {Logger.info(TAG, 'success, RSA Verify result = success');}return result;} catch (error) {Logger.error(TAG, `verify dofinal failed, ${error.code}, ${error.message}`);}} catch (err) {Logger.error(TAG, `verify init failed, ${err.code}, ${err.message}`);}return null;}async rsaConvertAndSign(rsaJsonString: string, textString: string): Promise<string> {let rsaSignString;try {let key = await this.convertRsaKey(rsaJsonString);try {rsaSignString = await this.rsaSign(key, textString);} catch (error) {Logger.error(TAG, `sign error, ${error.code}, ${error.message}`);return null;}} catch (error) {Logger.error(TAG, `convert rsa key error, ${error.code}, ${error.message}`);return null;}return rsaSignString;}async rsaConvertAndVerify(rsaJsonString: string, textString: string, rsaSignedText: string): Promise<Boolean> {let rsaVerifyRes;try {let key = await this.convertRsaKey(rsaJsonString);try {rsaVerifyRes = await this.rsaVerify(key, textString, rsaSignedText);} catch (error) {Logger.error(TAG, `sign error, ${error.code}, ${error.message}`);return null;}} catch (error) {Logger.error(TAG, `convert rsa key error, ${error.code}, ${error.message}`);return null;}return rsaVerifyRes;}
}

• 对文本文件加密：在[Encrypt.ets](文件中依次点击打开文件、选择密钥，通过filePicker选择明文文本文件和密钥文件，点击加密按钮，调用加密函数实现对文本内容进行加密，并将密文文件通过filePicker保存。 需要生成密钥文本文件时，可以点击随机生成AES密钥，通过调用cryptoFramework.symKeyGenerator生成用于加密的AES密钥，并通过filePicker保存密钥文本文件。 对消息加密的过程中采用cryptoFramework.Cipher完成加密操作。

/** Copyright (c) 2023 Huawei Device Co., Ltd.* Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**     http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/import { promptAction } from '@kit.ArkUI';
import Logger from '../util/Logger';
import { picker } from '@kit.CoreFileKit';
import { CryptoOperation } from '../cryptoframework/CryptoOperation';
import TextFileManager from '../textfilemanager/TextFileManager';const TAG: string = '[Crypto_Framework]';@Component
export struct Encrypt {@State keyFileName: string = '';@State keyFileUri: string = '';@State textFileUri: string = '';@State textFileName: string = '';@State keyString: string = '';@State cipherText: string = '';@State plainText: string = '';@State message: string = '';@State createKeyUri: string = '';@State encryptedFileUri: string = '';private CryptoOperation: CryptoOperation = new CryptoOperation();build() {Stack({ alignContent: Alignment.Center }) {Column() {GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {List() {ListItem() {Row() {Text($r('app.string.open_file')).fontSize(16).textAlign(TextAlign.Start).lineHeight(22)Blank()Text(this.textFileName === '' ? $r('app.string.please_choose') : this.textFileName).fontSize(14).textAlign(TextAlign.Start).lineHeight(19)Image($r('app.media.right_arrow')).height('19vp').width('10vp').margin({ left: 9, right: 9, top: 6, bottom: 6 })}.backgroundColor(0xFFFFFF).width('100%').height('52vp').padding({ top: 4, left: 12, right: 12 })}.onClick(() => {this.selectTextFileAndRead();})ListItem() {Row() {Text($r('app.string.select_key_file')).fontSize(16).textAlign(TextAlign.Start).lineHeight(22)Blank()Text(this.keyFileName === '' ? $r('app.string.please_choose') : this.keyFileName).fontSize(14).textAlign(TextAlign.Start).lineHeight(19)Image($r('app.media.right_arrow')).height('19vp').width('10vp').margin({ left: 9, right: 9, top: 6, bottom: 6 })}.backgroundColor(0xFFFFFF).width('100%').height('48vp').padding({ left: 12, right: 12 })}.onClick(() => {this.selectAesKeyFileAndRead();})}.width('100%').height('100%').borderRadius(16)}}}.height('100vp').margin({ left: 12, right: 12, bottom: 12 })GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {Column() {Row() {Text($r('app.string.text_context')).fontSize(16).textAlign(TextAlign.Start).fontWeight(500).lineHeight(22)}.padding({ left: 12, right: 12 }).width('100%').height('48vp')Row() {Text() {Span(this.plainText).fontSize(16).fontWeight(400).fontColor('#182431')}.textAlign(TextAlign.Start)}.padding({ left: 12, right: 12, bottom: 4 }).width('100%').height('52vp')}.borderRadius(16).width('100%').height('100').backgroundColor(0xFFFFFF)}}}.height('100vp').margin({ left: 12, right: 12, bottom: 12 })GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {Column() {Row() {Text($r('app.string.encrypted_context')).fontSize(16).textAlign(TextAlign.Start).fontWeight(500).lineHeight(22)}.padding({ left: 12, right: 12 }).width('100%').height('48vp')Row() {Text() {Span(this.cipherText).fontSize(16).fontWeight(400).fontColor('#182431')}.textAlign(TextAlign.Start)}.padding({ left: 12, right: 12, bottom: 4 }).width('100%').height('80vp')}.borderRadius(16).width('100%').height('100').backgroundColor(0xFFFFFF)}}}.height('100vp').margin({ left: 12, right: 12, bottom: 12 })Column() {GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Column() {Button() {Text($r('app.string.generate_aes_key_randomly')).fontSize(16).fontWeight(500).lineHeight(22).fontColor('#FFFFFF')}.id('encryptAesGenKey').borderRadius(20).type(ButtonType.Capsule).width('100%').height('40vp').margin({ bottom: 16 }).backgroundColor('#007DFF').onClick(() => {this.genAesKey();});Button() {Text($r('app.string.encrypt')).fontSize(16).fontWeight(500).lineHeight(22).fontColor('#FFFFFF')}.borderRadius(20).id('encryptionBtn').type(ButtonType.Capsule).margin({ left: 24, right: 24 }).width('100%').height('40vp').backgroundColor('#007DFF').onClick(() => {if (this.textFileUri === '' || this.keyFileUri === '') {promptAction.showToast({message: $r('app.string.null_message')});} else {this.encryptFunc();}});}}}.margin({ left: 24, right: 24 })}.width('100%').height('296vp').justifyContent(FlexAlign.End)}.width('100%').height('100%')}}async selectAesKeyFileAndRead() {let documentSelectOptions = new picker.DocumentSelectOptions();documentSelectOptions.fileSuffixFilters = ['.txt'];documentSelectOptions.maxSelectNumber = 1;let uri: string = '';let documentViewPicker = new picker.DocumentViewPicker();await documentViewPicker.select(documentSelectOptions).then((documentSelectResult: Array<string>) => {uri = documentSelectResult[0];console.info('documentViewPicker.select to text file succeed and uris are:' + uri);}).catch((err: Error) => {console.error(`Invoke documentViewPicker.select failed, code is ${err}, message is ${err.message}`);})this.keyFileUri = uri;await TextFileManager.readTextFile(this.keyFileUri);this.keyFileName = TextFileManager.getName();this.keyString = TextFileManager.getString();}async selectTextFileAndRead() {let documentSelectOptions = new picker.DocumentSelectOptions();documentSelectOptions.fileSuffixFilters = ['.txt'];documentSelectOptions.maxSelectNumber = 1;let uri: string = '';let documentViewPicker = new picker.DocumentViewPicker();await documentViewPicker.select(documentSelectOptions).then((documentSelectResult: Array<string>) => {uri = documentSelectResult[0];console.info('documentViewPicker.select to text file succeed and uris are:' + uri);}).catch((err: Error) => {console.error(`Invoke documentViewPicker.select failed, code is ${err}, message is ${err.message}`);})this.textFileUri = uri;await TextFileManager.readTextFile(this.textFileUri);this.textFileName = TextFileManager.getName();this.plainText = TextFileManager.getString();}async createTextFileAndWrite() {let documentSaveOptions = new picker.DocumentSaveOptions();documentSaveOptions.newFileNames = ['cipherText.txt'];let documentPicker = new picker.DocumentViewPicker();let documentSaveResult = await documentPicker.save(documentSaveOptions);this.encryptedFileUri = documentSaveResult[0];await TextFileManager.writeTextFile(this.encryptedFileUri, this.cipherText);}async createKeyFileAndWrite() {let documentSaveOptions = new picker.DocumentSaveOptions();documentSaveOptions.newFileNames = ['aesKey.txt'];let documentPicker = new picker.DocumentViewPicker();let documentSaveResult = await documentPicker.save(documentSaveOptions);this.createKeyUri = documentSaveResult[0];await TextFileManager.writeTextFile(this.createKeyUri, this.keyString);}async encryptFunc() {if (this.plainText === '' || this.keyFileUri === '') {promptAction.showToast({message: $r('app.string.null_message')});return;}try {this.cipherText = await this.CryptoOperation.aesConvertAndEncrypt(this.keyString, this.plainText);} catch (error) {Logger.error(TAG, `encrypt failed, ${error}`);promptAction.showToast({message: $r('app.string.encrypt_fail')});}if (this.cipherText === '' || this.cipherText === undefined || this.cipherText === null) {promptAction.showToast({message: $r('app.string.encrypt_fail')});return;} else {try {await this.createTextFileAndWrite();} catch (error) {Logger.error(TAG, `encrypt failed, ${error}`);}}if (this.encryptedFileUri === '' || typeof (this.encryptedFileUri) == 'undefined') {promptAction.showToast({message: $r('app.string.encrypt_fail')});} else {promptAction.showToast({message: $r('app.string.encrypt_success')});}}async genAesKey() {try {this.keyString = await this.CryptoOperation.generateAesKey();} catch (error) {Logger.error(TAG, `gen aes key failed, ${error}`);}if (this.keyString === '' || typeof (this.keyString) == 'undefined') {promptAction.showToast({message: $r('app.string.gen_key_fail')});return;} else {try {await this.createKeyFileAndWrite();} catch (error) {Logger.error(TAG, `write aes key failed, ${error}`);}}if (this.createKeyUri === '' || typeof (this.createKeyUri) == 'undefined') {promptAction.showToast({message: $r('app.string.gen_key_fail')});} else {promptAction.showToast({message: $r('app.string.gen_key_success')});}}
}

• 对文本文件解密：在[Decrypt.ets] 文件中依次点击打开文件、选择密钥，通过filePicker选择密文文本文件和密钥文件，点击解密按钮，调用解密函数实现对文本内容进行解密，并将明文文件通过filePicker保存。 对消息解密的过程中采用cryptoFramework.Cipher完成解密操作。

/** Copyright (c) 2023 Huawei Device Co., Ltd.* Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**     http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/import { promptAction } from '@kit.ArkUI';
import Logger from '../util/Logger';
import { picker } from '@kit.CoreFileKit';
import { CryptoOperation } from '../cryptoframework/CryptoOperation';
import TextFileManager from '../textfilemanager/TextFileManager';const TAG: string = '[Crypto_Framework]';@Component
export struct Decrypt {@State keyFileName: string = '';@State keyFileUri: string = '';@State textFileUri: string = '';@State textFileName: string = '';@State keyString: string = '';@State cipherText: string = '';@State plainText: string = '';@State message: string = '';@State decryptedFileUri: string = '';private CryptoOperation: CryptoOperation = new CryptoOperation();build() {Stack({ alignContent: Alignment.Center }) {Column() {GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {List() {ListItem() {Row() {Text($r('app.string.open_file')).fontSize(16).textAlign(TextAlign.Start).lineHeight(22)Blank()Text(this.textFileName === '' ? $r('app.string.please_choose') : this.textFileName).fontSize(14).textAlign(TextAlign.Start).lineHeight(19)Image($r('app.media.right_arrow')).height('19vp').width('10vp').margin({ left: 9, right: 9, top: 6, bottom: 6 })}.backgroundColor(0xFFFFFF).width('100%').height('52vp').padding({ top: 4, left: 12, right: 12 })}.onClick(() => {this.selectTextFileAndRead();})ListItem() {Row() {Text($r('app.string.select_key_file')).fontSize(16).textAlign(TextAlign.Start).lineHeight(22)Blank()Text(this.keyFileName === '' ? $r('app.string.please_choose') : this.keyFileName).fontSize(14).textAlign(TextAlign.Start).lineHeight(19)Image($r('app.media.right_arrow')).height('19vp').width('10vp').margin({ left: 9, right: 9, top: 6, bottom: 6 })}.backgroundColor(0xFFFFFF).width('100%').height('48vp').padding({ left: 12, right: 12 })}.onClick(() => {this.selectAesKeyFileAndRead();})}.width('100%').height('100%').borderRadius(16)}}}.height('100vp').margin({ left: 12, right: 12, bottom: 12 })GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {Column() {Row() {Text($r('app.string.text_context')).fontSize(16).textAlign(TextAlign.Start).fontWeight(500).lineHeight(22)}.padding({ left: 12, right: 12 }).width('100%').height('48vp')Row() {Text() {Span(this.cipherText).fontSize(16).fontWeight(400).fontColor('#182431')}.textAlign(TextAlign.Start)}.padding({ left: 12, right: 12, bottom: 4 }).width('100%').height('52vp')}.borderRadius(16).width('100%').height('100').backgroundColor(0xFFFFFF)}}}.height('100vp').margin({ left: 12, right: 12, bottom: 12 })GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {Column() {Row() {Text($r('app.string.decrypted_context')).fontSize(16).textAlign(TextAlign.Start).fontWeight(500).lineHeight(22)}.padding({ left: 12, right: 12 }).width('100%').height('48vp')Row() {Text() {Span(this.plainText).fontSize(16).fontWeight(400).fontColor('#182431')}.textAlign(TextAlign.Start)}.padding({ left: 12, right: 12, bottom: 4 }).width('100%').height('52vp')}.borderRadius(16).width('100%').height('100').backgroundColor(0xFFFFFF)}}}.height('100vp').margin({ left: 12, right: 12, bottom: 12 })Column() {GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Column() {Button() {Text($r('app.string.decrypt')).fontSize(16).fontWeight(500).lineHeight(22).fontColor('#FFFFFF')}.borderRadius(20).id('decryptionBtn').type(ButtonType.Capsule).margin({ left: 24, right: 24 }).width('100%').height('40vp').backgroundColor('#007DFF').onClick(() => {if (this.textFileUri === '' || this.keyFileUri === '') {promptAction.showToast({message: $r('app.string.null_message')});} else {this.decryptFunc();}});}}}.margin({ left: 24, right: 24 })}.width('100%').height('296vp').justifyContent(FlexAlign.End)}.width('100%').height('100%')}}async selectAesKeyFileAndRead() {let documentSelectOptions = new picker.DocumentSelectOptions();documentSelectOptions.fileSuffixFilters = ['.txt'];documentSelectOptions.maxSelectNumber = 1;let uri: string = '';let documentViewPicker = new picker.DocumentViewPicker();await documentViewPicker.select(documentSelectOptions).then((documentSelectResult: Array<string>) => {uri = documentSelectResult[0];console.info('documentViewPicker.select to text file succeed and uris are:' + uri);}).catch((err: Error) => {console.error(`Invoke documentViewPicker.select failed, code is ${err}, message is ${err.message}`);})this.keyFileUri = uri;await TextFileManager.readTextFile(this.keyFileUri);this.keyFileName = TextFileManager.getName();this.keyString = TextFileManager.getString();}async selectTextFileAndRead() {let documentSelectOptions = new picker.DocumentSelectOptions();documentSelectOptions.fileSuffixFilters = ['.txt'];documentSelectOptions.maxSelectNumber = 1;let uri: string = '';let documentViewPicker = new picker.DocumentViewPicker();await documentViewPicker.select(documentSelectOptions).then((documentSelectResult: Array<string>) => {uri = documentSelectResult[0];console.info('documentViewPicker.select to text file succeed and uris are:' + uri);}).catch((err: Error) => {console.error(`Invoke documentViewPicker.select failed, code is ${err}, message is ${err.message}`);})this.textFileUri = uri;await TextFileManager.readTextFile(this.textFileUri);this.textFileName = TextFileManager.getName();this.cipherText = TextFileManager.getString();}async createTextFileAndWrite() {let documentSaveOptions = new picker.DocumentSaveOptions();documentSaveOptions.newFileNames = ['plainText.txt'];let documentPicker = new picker.DocumentViewPicker();let documentSaveResult = await documentPicker.save(documentSaveOptions);this.decryptedFileUri = documentSaveResult[0];await TextFileManager.writeTextFile(this.decryptedFileUri, this.plainText);}async decryptFunc() {if (this.cipherText === '' || this.keyFileUri === '') {promptAction.showToast({message: $r('app.string.null_message')});return;}try {this.plainText = await this.CryptoOperation.aesConvertAndDecrypt(this.keyString, this.cipherText);} catch (error) {Logger.error(TAG, `decrypt failed, ${error}`);promptAction.showToast({message: $r('app.string.decrypt_fail')});return;}if (this.plainText === '' || this.plainText === null || this.plainText === undefined) {promptAction.showToast({message: $r('app.string.decrypt_fail')});return;} else {try {await this.createTextFileAndWrite();} catch (error) {Logger.error(TAG, `decrypt failed, ${error}`);}}if (this.decryptedFileUri === '' || typeof (this.decryptedFileUri) == 'undefined') {promptAction.showToast({message: $r('app.string.decrypt_fail')});} else {promptAction.showToast({message: $r('app.string.decrypt_success')});}}
}

• 对文本文件签名：在[Sign.ets] 文件中依次点击打开文件、选择密钥，通过filePicker选择待签名文本文件和密钥文件，点击签名按钮，调用签名函数实现对文本内容进行加密，并将签名文件通过filePicker保存。 需要生成密钥文本文件时，可以点击随机生成RSA密钥，通过调用cryptoFramework.asyKeyGenerator生成用于签名的RSA密钥，并通过filePicker保存密钥文本文件。 对消息签名的过程中采用cryptoFramework.Sign完成加密操作。

/** Copyright (c) 2023 Huawei Device Co., Ltd.* Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**     http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/import { promptAction } from '@kit.ArkUI';
import Logger from '../util/Logger';
import { picker } from '@kit.CoreFileKit';
import { CryptoOperation } from '../cryptoframework/CryptoOperation';
import TextFileManager from '../textfilemanager/TextFileManager';const TAG: string = '[Crypto_Framework]';@Component
export struct Sign {@State keyFileName: string = '';@State keyFileUri: string = '';@State textFileUri: string = '';@State textFileName: string = '';@State keyString: string = '';@State cipherText: string = '';@State plainText: string = '';@State message: string = '';@State signFileUri: string = '';@State createKeyUri: string = '';private CryptoOperation: CryptoOperation = new CryptoOperation();build() {Stack({ alignContent: Alignment.Center }) {Column() {GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {List() {ListItem() {Row() {Text($r('app.string.open_file')).fontSize(16).textAlign(TextAlign.Start).lineHeight(22)Blank()Text(this.textFileName === '' ? $r('app.string.please_choose') : this.textFileName).fontSize(14).textAlign(TextAlign.Start).lineHeight(19)Image($r('app.media.right_arrow')).height('19vp').width('10vp').margin({ left: 9, right: 9, top: 6, bottom: 6 })}.backgroundColor(0xFFFFFF).width('100%').height('52vp').padding({ top: 4, left: 12, right: 12 })}.onClick(() => {this.selectTextFileAndRead();})ListItem() {Row() {Text($r('app.string.select_key_file')).fontSize(16).textAlign(TextAlign.Start).lineHeight(22)Blank()Text(this.keyFileName === '' ? $r('app.string.please_choose') : this.keyFileName).fontSize(14).textAlign(TextAlign.Start).lineHeight(19)Image($r('app.media.right_arrow')).height('19vp').width('10vp').margin({ left: 9, right: 9, top: 6, bottom: 6 })}.backgroundColor(0xFFFFFF).width('100%').height('48vp').padding({ left: 12, right: 12 })}.onClick(() => {this.selectRsaKeyFileAndRead();})}.width('100%').height('100%').borderRadius(16)}}}.height('100vp').margin({ left: 12, right: 12, bottom: 12 })GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {Column() {Row() {Text($r('app.string.text_context')).fontSize(16).textAlign(TextAlign.Start).fontWeight(500).lineHeight(22)}.padding({ left: 12, right: 12 }).width('100%').height('48vp')Row() {Text() {Span(this.plainText).fontSize(16).fontWeight(400).fontColor('#182431')}.textAlign(TextAlign.Start)}.padding({ left: 12, right: 12, bottom: 4 }).width('100%').height('52vp')}.borderRadius(16).width('100%').height('100').backgroundColor(0xFFFFFF)}}}.height('100vp').margin({ left: 12, right: 12, bottom: 12 })Column() {GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Column() {Button() {Text($r('app.string.generate_rsa_key_randomly')).fontSize(16).fontWeight(500).lineHeight(22).fontColor('#FFFFFF')}.id('encryptRsaGenKey').borderRadius(20).type(ButtonType.Capsule).width('100%').height('40vp').margin({ bottom: 16 }).backgroundColor('#007DFF').onClick(() => {this.genRsaKey();});Button() {Text($r('app.string.sign')).fontSize(16).fontWeight(500).lineHeight(22).fontColor('#FFFFFF')}.borderRadius(20).id('signBtn').type(ButtonType.Capsule).margin({ left: 24, right: 24 }).width('100%').height('40vp').backgroundColor('#007DFF').onClick(() => {if (this.textFileUri === '' || this.keyFileUri === '') {promptAction.showToast({message: $r('app.string.null_message')});} else {this.signFunc();}});}}}.margin({ left: 24, right: 24 })}.width('100%').height('412vp').justifyContent(FlexAlign.End)}.width('100%').height('100%')}}async selectRsaKeyFileAndRead() {let documentSelectOptions = new picker.DocumentSelectOptions();documentSelectOptions.fileSuffixFilters = ['.txt'];documentSelectOptions.maxSelectNumber = 1;let uri: string = '';let documentViewPicker = new picker.DocumentViewPicker();await documentViewPicker.select(documentSelectOptions).then((documentSelectResult: Array<string>) => {uri = documentSelectResult[0];console.info('documentViewPicker.select to text file succeed and uris are:' + uri);}).catch((err: Error) => {console.error(`Invoke documentViewPicker.select failed, code is ${err}, message is ${err.message}`);})this.keyFileUri = uri;// 获取到密钥文档文件的文件名称await TextFileManager.readTextFile(this.keyFileUri);this.keyFileName = TextFileManager.getName();this.keyString = TextFileManager.getString();}async selectTextFileAndRead() {let documentSelectOptions = new picker.DocumentSelectOptions();documentSelectOptions.fileSuffixFilters = ['.txt'];documentSelectOptions.maxSelectNumber = 1;let uri: string = '';let documentViewPicker = new picker.DocumentViewPicker();await documentViewPicker.select(documentSelectOptions).then((documentSelectResult: Array<string>) => {uri = documentSelectResult[0];console.info('documentViewPicker.select to text file succeed and uris are:' + uri);}).catch((err: Error) => {console.error(`Invoke documentViewPicker.select failed, code is ${err}, message is ${err.message}`);})// 获取到文档文件的URIthis.textFileUri = uri;// 获取到文档文件的文件名称await TextFileManager.readTextFile(this.textFileUri);this.textFileName = TextFileManager.getName();this.plainText = TextFileManager.getString();}async createTextFileAndWrite() {let documentSaveOptions = new picker.DocumentSaveOptions();documentSaveOptions.newFileNames = ['signText.txt'];let documentPicker = new picker.DocumentViewPicker();let documentSaveResult = await documentPicker.save(documentSaveOptions);this.signFileUri = documentSaveResult[0];await TextFileManager.writeTextFile(this.signFileUri, this.cipherText);}async createKeyFileAndWrite() {let documentSaveOptions = new picker.DocumentSaveOptions();documentSaveOptions.newFileNames = ['rsaKey.txt'];let documentPicker = new picker.DocumentViewPicker();try {let documentSaveResult = await documentPicker.save(documentSaveOptions);this.createKeyUri = documentSaveResult[0];await TextFileManager.writeTextFile(this.createKeyUri, this.keyString);} catch (error) {Logger.error(TAG, `save key failed, ${error}`);}}async signFunc() {if (this.plainText === '' || this.keyFileUri === '') {promptAction.showToast({message: $r('app.string.null_message')});return;}try {this.cipherText = await this.CryptoOperation.rsaConvertAndSign(this.keyString, this.plainText);} catch (error) {promptAction.showToast({message: $r('app.string.sign_fail')});Logger.error(TAG, `sign failed, ${error}`);}if (this.cipherText === '' || this.cipherText === null || this.cipherText === undefined) {promptAction.showToast({message: $r('app.string.sign_fail')});return;} else {await this.createTextFileAndWrite();}if (this.signFileUri === '' || typeof (this.signFileUri) == 'undefined') {promptAction.showToast({message: $r('app.string.sign_fail')});} else {promptAction.showToast({message: $r('app.string.sign_success')});}}async genRsaKey() {promptAction.showToast({message: $r('app.string.slow_rsa_key_gen')});try {this.keyString = await this.CryptoOperation.generateRsaKey();} catch (error) {Logger.error(TAG, `gen rsa key failed, ${error}`);}if (this.keyString === '' || typeof (this.keyString) == 'undefined') {promptAction.showToast({message: $r('app.string.gen_key_fail')});return;} else {try {await this.createKeyFileAndWrite();} catch (error) {Logger.error(TAG, `write rsa key failed, ${error}`);}}if (this.createKeyUri === '' || typeof (this.createKeyUri) == 'undefined') {promptAction.showToast({message: $r('app.string.gen_key_fail')});} else {promptAction.showToast({message: $r('app.string.gen_key_success')});}}
}

• 对文本文件验签：在[Verify.ets]文件中依次点击打开文件、选择密钥、选择签名文件，通过filePicker选择密文文本文件、密钥文件和签名文件，点击验签按钮，调用验签函数实现对文本内容进行验签，并显示验签结果。 对消息验签的过程中采用cryptoFramework.Verify完成验签操作。

/** Copyright (c) 2023 Huawei Device Co., Ltd.* Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**     http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/import { promptAction } from '@kit.ArkUI';
import Logger from '../util/Logger';
import { picker } from '@kit.CoreFileKit';
import { CryptoOperation } from '../cryptoframework/CryptoOperation';
import TextFileManager from '../textfilemanager/TextFileManager';const TAG: string = '[Crypto_Framework]';@Component
export struct Verify {@State keyFileName: string = '';@State keyFileUri: string = '';@State textFileUri: string = '';@State textFileName: string = '';@State keyString: string = '';@State plainText: string = '';@State message: string = '';@State signFileUri: string = '';@State signFileName: string = '';@State signText: string = '';@State createKeyUri: string = '';private CryptoOperation: CryptoOperation = new CryptoOperation();build() {Stack({ alignContent: Alignment.Center }) {Column() {GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {List() {ListItem() {Row() {Text($r('app.string.open_file')).fontSize(16).textAlign(TextAlign.Start).lineHeight(22)Blank()Text(this.textFileName === '' ? $r('app.string.please_choose') : this.textFileName).fontSize(14).textAlign(TextAlign.Start).lineHeight(19)Image($r('app.media.right_arrow')).height('19vp').width('10vp').margin({ left: 9, right: 9, top: 6, bottom: 6 })}.backgroundColor(0xFFFFFF).width('100%').height('52vp').padding({ top: 4, left: 12, right: 12 })}.onClick(() => {this.selectTextFileAndRead();})ListItem() {Row() {Text($r('app.string.select_key_file')).fontSize(16).textAlign(TextAlign.Start).lineHeight(22)Blank()Text(this.keyFileName === '' ? $r('app.string.please_choose') : this.keyFileName).fontSize(14).textAlign(TextAlign.Start).lineHeight(19)Image($r('app.media.right_arrow')).height('19vp').width('10vp').margin({ left: 9, right: 9, top: 6, bottom: 6 })}.backgroundColor(0xFFFFFF).width('100%').height('48vp').padding({ left: 12, right: 12 })}.onClick(() => {this.selectRsaKeyFileAndRead();})}.width('100%').height('100%').borderRadius(16)}}}.height('100vp').margin({ left: 12, right: 12, bottom: 12 })GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {List() {ListItem() {Row() {Text($r('app.string.select_signature_file')).fontSize(16).textAlign(TextAlign.Start).lineHeight(22)Blank()Text(this.signFileName === '' ? $r('app.string.please_choose') : this.signFileName).fontSize(14).textAlign(TextAlign.Start).lineHeight(19)Image($r('app.media.right_arrow')).height('19vp').width('10vp').margin({ left: 9, right: 9, top: 6, bottom: 6 })}.backgroundColor(0xFFFFFF).width('100%').height('56vp').padding({ left: 12, right: 12, top: 4, bottom: 4 })}.onClick(() => {this.selectSignFileAndRead();})}.width('100%').borderRadius(16)}}}.height('56vp').margin({ left: 12, right: 12, bottom: 12 })GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {Column() {Row() {Text($r('app.string.text_context')).fontSize(16).textAlign(TextAlign.Start).fontWeight(500).lineHeight(22)}.padding({ left: 12, right: 12 }).width('100%').height('48vp')Row() {Text() {Span(this.plainText).fontSize(16).fontWeight(400).fontColor('#182431')}.textAlign(TextAlign.Start)}.padding({ left: 12, right: 12, bottom: 4 }).width('100%').height('52vp')}.borderRadius(16).width('100%').height('100').backgroundColor(0xFFFFFF)}}}.height('100vp').margin({ left: 12, right: 12, bottom: 12 })Column() {GridRow() {GridCol({ span: { xs: 12, sm: 12, md: 12, lg: 12 } }) {Column() {Button() {Text($r('app.string.verify')).fontSize(16).fontWeight(500).lineHeight(22).fontColor('#FFFFFF')}.borderRadius(20).id('verifyBtn').type(ButtonType.Capsule).margin({ left: 24, right: 24 }).width('100%').height('40vp').backgroundColor('#007DFF').onClick(() => {if (this.textFileUri === '' || this.keyFileUri === '' || this.signFileUri === '') {promptAction.showToast({message: $r('app.string.null_message')});} else {this.verifyFunc();}});}}}.margin({ left: 24, right: 24 })}.width('100%').height('340vp').justifyContent(FlexAlign.End)}.width('100%').height('100%')}}async selectRsaKeyFileAndRead() {let documentSelectOptions = new picker.DocumentSelectOptions();documentSelectOptions.fileSuffixFilters = ['.txt'];documentSelectOptions.maxSelectNumber = 1;let uri: string = '';let documentViewPicker = new picker.DocumentViewPicker();await documentViewPicker.select(documentSelectOptions).then((documentSelectResult: Array<string>) => {uri = documentSelectResult[0];console.info('documentViewPicker.select to text file succeed and uris are:' + uri);}).catch((err: Error) => {console.error(`Invoke documentViewPicker.select failed, code is ${err}, message is ${err.message}`);})// 获取到密钥文档文件的URIthis.keyFileUri = uri;// 获取到密钥文档文件的文件名称await TextFileManager.readTextFile(this.keyFileUri);this.keyFileName = TextFileManager.getName();this.keyString = TextFileManager.getString();}async selectTextFileAndRead() {let documentSelectOptions = new picker.DocumentSelectOptions();documentSelectOptions.fileSuffixFilters = ['.txt'];documentSelectOptions.maxSelectNumber = 1;let uri: string = '';let documentViewPicker = new picker.DocumentViewPicker();await documentViewPicker.select(documentSelectOptions).then((documentSelectResult: Array<string>) => {uri = documentSelectResult[0];console.info('documentViewPicker.select to text file succeed and uris are:' + uri);}).catch((err: Error) => {console.error(`Invoke documentViewPicker.select failed, code is ${err}, message is ${err.message}`);})// 获取到文档文件的URIthis.textFileUri = uri;// 获取到文档文件的文件名称await TextFileManager.readTextFile(this.textFileUri);this.textFileName = TextFileManager.getName();this.plainText = TextFileManager.getString();}async selectSignFileAndRead() {let documentSelectOptions = new picker.DocumentSelectOptions();documentSelectOptions.fileSuffixFilters = ['.txt'];documentSelectOptions.maxSelectNumber = 1;let uri: string = '';let documentViewPicker = new picker.DocumentViewPicker();await documentViewPicker.select(documentSelectOptions).then((documentSelectResult: Array<string>) => {uri = documentSelectResult[0];console.info('documentViewPicker.select to text file succeed and uris are:' + uri);}).catch((err: Error) => {console.error(`Invoke documentViewPicker.select failed, code is ${err}, message is ${err.message}`);})// 获取到文档文件的URIthis.signFileUri = uri;// 获取到文档文件的文件名称await TextFileManager.readTextFile(this.signFileUri);this.signFileName = TextFileManager.getName();this.signText = TextFileManager.getString();}async createKeyFileAndWrite() {let documentSaveOptions = new picker.DocumentSaveOptions();documentSaveOptions.newFileNames = ['rsaKey.txt'];let documentPicker = new picker.DocumentViewPicker();try {let documentSaveResult = await documentPicker.save(documentSaveOptions);this.createKeyUri = documentSaveResult[0];await TextFileManager.writeTextFile(this.createKeyUri, this.keyString);} catch (error) {Logger.error(TAG, `save key failed, ${error}`);}}async verifyFunc() {let verifyRes: Boolean = false;if (this.plainText === '' || this.keyFileUri === '' || this.signText === '') {promptAction.showToast({message: $r('app.string.null_message')});return;}try {verifyRes = await this.CryptoOperation.rsaConvertAndVerify(this.keyString, this.plainText, this.signText);} catch (error) {Logger.error(TAG, `verify failed, ${error}`);}if (verifyRes != true) {promptAction.showToast({message: $r('app.string.verify_fail')});return;} else {promptAction.showToast({message: $r('app.string.verify_success')});}}
}

以上就是本篇文章所带来的鸿蒙开发中一小部分技术讲解；想要学习完整的鸿蒙全栈技术。可以在结尾找我可全部拿到！
下面是鸿蒙的完整学习路线，展示如下：

除此之外，根据这个学习鸿蒙全栈学习路线，也附带一整套完整的学习【文档+视频】，内容包含如下：

内容包含了：（ArkTS、ArkUI、Stage模型、多端部署、分布式应用开发、音频、视频、WebGL、OpenHarmony多媒体技术、Napi组件、OpenHarmony内核、鸿蒙南向开发、鸿蒙项目实战）等技术知识点。帮助大家在学习鸿蒙路上快速成长！

鸿蒙【北向应用开发+南向系统层开发】文档

鸿蒙【基础+实战项目】视频

鸿蒙面经

为了避免大家在学习过程中产生更多的时间成本，对比我把以上内容全部放在了↓↓↓想要的可以自拿喔！谢谢大家观看！