typed-wx-api/dist/crypto/pkcs7_encode.js

Typed Wechat API

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.PKCS7Encoder = void 0;
/**
 * 提供基于PKCS7算法的加解密接口
 * @internal
 */
class PKCS7Encoder {
    static decode(text) {
        let pad = text[text.length - 1];
        if (pad < 1 || pad > 32) {
            pad = 0;
        }
        return text.slice(0, text.length - pad);
    }
    static encode(text) {
        const blockSize = 32;
        const textLength = text.length;
        //计算需要填充的位数
        const amountToPad = blockSize - (textLength % blockSize);
        const result = new Buffer(amountToPad);
        result.fill(amountToPad);
        return Buffer.concat([text, result]);
    }
}
exports.PKCS7Encoder = PKCS7Encoder;
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