HarmonyOS Next加解密算法中的分段处理技巧 原创

import { cryptoFramework } from '@kit.CryptoArchitectureKit';
import { buffer } from '@kit.ArkTS';
// 生成AES对称密钥
async function generateAESKey() {
    let aesGenerator = cryptoFramework.createSymKeyGenerator('AES128');
    let keyBlob = { data: new Uint8Array([83, 217, 231, 76, 28, 113, 23, 219, 250, 71, 209, 210, 205, 97, 32, 159]) };
    return await aesGenerator.convertKey(keyBlob);
}
// 加密函数
async function encryptMessageBySegment(symKey, plainText) {
    let cipher = cryptoFramework.createCipher('AES128|CBC|PKCS7');
    await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, null);
    let updateLength = 1024; // 假设每次处理1024字节数据
    let cipherText = new Uint8Array();
    for (let i = 0; i < plainText.data.length; i += updateLength) {
        let updateMessage = plainText.data.subarray(i, i + updateLength);
        let updateMessageBlob = { data: updateMessage };
        // 分段加密
        let updateOutput = await cipher.update(updateMessageBlob);
        // 拼接加密结果
        let mergeText = new Uint8Array(cipherText.length + updateOutput.data.length);
        mergeText.set(cipherText);
        mergeText.set(updateOutput.data, cipherText.length);
        cipherText = mergeText;
    }
    // 完成加密并获取认证信息（如果是GCM模式等需要认证信息的模式）
    let authTag = await cipher.doFinal(null);
    // 将认证信息拼接到密文后面（如果需要）
    let finalCipherText = new Uint8Array(cipherText.length + authTag.data.length);
    finalCipherText.set(cipherText);
    finalCipherText.set(authTag.data, cipherText.length);
    return finalCipherText;
}
async function main() {
    try {
        let symKey = await generateAESKey();
        let message = "This is a very long test message. This is a very long test message. This is a very long test message.";
        let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
        let encryptedText = await encryptMessageBySegment(symKey, plainText);
        console.log('Encrypted text:', encryptedText);
    } catch (error) {
        console.error('Encryption failed:', error);
    }
}
main();
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import { cryptoFramework } from '@kit.CryptoArchitectureKit';
import { buffer } from '@kit.ArkTS';
// 生成RSA密钥对
async function generateRSAKeyPair() {
    let keyGenAlg = "RSA1024";
    let generator = cryptoFramework.createAsyKeyGenerator(keyGenAlg);
    return await generator.generateKeyPair();
}
// 分段加密函数
async function encryptMessageBySegment(pubKey, plainText) {
    let cipher = cryptoFramework.createCipher('RSA1024|PKCS1');
    await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, pubKey, null);
    let updateLength = 64; // 根据RSA密钥长度和填充模式确定合适的分段长度
    let cipherText = new Uint8Array();
    for (let i = 0; i < plainText.data.length; i += updateLength) {
        let updateMessage = plainText.data.subarray(i, i + updateLength);
        let updateMessageBlob = { data: updateMessage };
        // 分段加密
        let updateOutput = await cipher.update(updateMessageBlob);
        // 拼接加密结果
        let mergeText = new Uint8Array(cipherText.length + updateOutput.data.length);
        mergeText.set(cipherText);
        mergeText.set(updateOutput.data, cipherText.length);
        cipherText = mergeText;
    }
    // 完成加密
    let finalCipherText = await cipher.doFinal(null);
    // 拼接最终结果
    let result = new Uint8Array(cipherText.length + finalCipherText.data.length);
    result.set(cipherText);
    result.set(finalCipherText.data, cipherText.length);
    return result;
}
async function main() {
    try {
        let keyPair = await generateRSAKeyPair();
        let message = "This is a long test message for RSA encryption. This is a long test message for RSA encryption.";
        let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from(message, 'utf-8').buffer) };
        let encryptedText = await encryptMessageBySegment(keyPair.pubKey, plainText);
        console.log('Encrypted text:', encryptedText);
    } catch (error) {
        console.error('Encryption failed:', error);
    }
}
main();
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