mima-kit/dist/core/asn1.js

mima-kit is a cryptographic suite implemented in TypeScript. The goal is to provide an easy-to-use cryptographic library. mima-kit 是一个使用 TypeScript 实现的密码学套件。目标是提供一个简单易用的密码学库。

import { U8 } from './utils';
export const ASN1 = {
    // 0x04
    OCTET_STRING: (value) => {
        const buffer = new U8(value.length + 2);
        buffer.set([0x04, value.length], 0);
        buffer.set(value, 2);
        return buffer;
    },
    // 0x05
    NULL: () => new U8([0x05, 0x00]),
    // 0x06
    OBJECT_IDENTIFIER: (id = '') => {
        const node = id.split('.').map(Number);
        const buffer = [];
        buffer.push(node[0] * 40 + node[1]);
        for (let i = 2; i < node.length; i++) {
            let n = node[i];
            if (n < 128) {
                buffer.push(n);
            }
            else {
                const bytes = [n & 0x7F];
                n >>= 7;
                while (n > 0) {
                    bytes.unshift((n & 0x7F) | 0x80);
                    n >>= 7;
                }
                buffer.push(...bytes);
            }
        }
        return new U8([0x06, buffer.length, ...buffer]);
    },
    // 0x30
    SEQUENCE: (value) => {
        const length = value.reduce((sum, v) => sum + v.length, 0);
        const buffer = new U8(length + 2);
        buffer.set([0x30, length], 0);
        let offset = 2;
        for (const v of value) {
            buffer.set(v, offset);
            offset += v.length;
        }
        return buffer;
    },
};