FAQ

加解密中文字符串时乱码

在OpenHarmony应用开发加解密功能时，经常会遇到加解密中文字符串乱码的问题。经采样分析，该问题的根因不在于加解密算法或者公私钥的问题导致，而是加解密前后string与Uint8Array的转换没有考虑到中文字符位数导致。因此，可以参考下述方案：

// 字符串转成字节流
function stringToUint8Array(str: string) {
    return new Uint8Array(buffer.from(str, 'utf-8').buffer);
}

// 字节流转成字符串
function uint8ArrayToString(array: Uint8Array) {
    // 将UTF-8编码转换成Unicode编码
    let out: string = '';
    let index: number = 0;
    let len: number = array.length;
    while (index < len) {
        let character = array[index++];
        switch(character >> 4) {
            case 0:
            case 1:
            case 2:
            case 3:
            case 4:
            case 5:
            case 6:
            case 7:
            out += String.fromCharCode(character);
            break;
            case 12:
            case 13:
            out += String.fromCharCode(((character & 0x1F) << 6) | (array[index++] & 0x3F));
            break;
            case 14:
            out += String.fromCharCode(((character & 0x0F) << 12) | ((array[index++] & 0x3F) << 6) | ((array[index++] & 0x3F) << 0));
            break;
            default:
            break;
        }
    }
    return out;
}

相关文献

https://developer.huawei.com/consumer/cn/doc/harmonyos-guides/crypto-rsa-asym-encrypt-decrypt-pkcs1