@swtc/common/esm/sm3/common.js

swtc chain information

import { toArray, join32 } from "./utils";
import { funcAssert as assert } from "../functions";
export class BlockHash {
    constructor(blockSize = 512, outSize = 256, hmacStrength = 192, padLength = 64) {
        this.pending = null;
        this.pendingTotal = 0;
        this.endian = "big";
        this.blockSize = blockSize;
        this.outSize = outSize;
        this.hmacStrength = hmacStrength;
        this.padLength = padLength / 8;
        this._delta8 = this.blockSize / 8;
        this._delta32 = this.blockSize / 32;
    }
    update(msg, enc = "") {
        msg = toArray(msg, enc);
        if (!this.pending)
            this.pending = msg;
        else
            this.pending = this.pending.concat(msg);
        this.pendingTotal += msg.length;
        if (this.pending.length >= this._delta8) {
            msg = this.pending;
            const r = msg.length % this._delta8;
            this.pending = msg.slice(msg.length - r, msg.length);
            if (this.pending.length === 0)
                this.pending = null;
            msg = join32(msg, 0, msg.length - r, this.endian);
            for (let i = 0; i < msg.length; i += this._delta32)
                this._update(msg, i);
        }
        return this;
    }
    digest(enc = "") {
        this.update(this.pad());
        assert(this.pending === null);
        return this._digest(enc);
    }
    pad() {
        var len = this.pendingTotal;
        var bytes = this._delta8;
        var k = bytes - ((len + this.padLength) % bytes);
        var res = new Array(k + this.padLength);
        res[0] = 0x80;
        for (var i = 1; i < k; i++)
            res[i] = 0;
        len <<= 3;
        if (this.endian === "big") {
            for (var t = 8; t < this.padLength; t++)
                res[i++] = 0;
            res[i++] = 0;
            res[i++] = 0;
            res[i++] = 0;
            res[i++] = 0;
            res[i++] = (len >>> 24) & 0xff;
            res[i++] = (len >>> 16) & 0xff;
            res[i++] = (len >>> 8) & 0xff;
            res[i++] = len & 0xff;
        }
        else {
            res[i++] = len & 0xff;
            res[i++] = (len >>> 8) & 0xff;
            res[i++] = (len >>> 16) & 0xff;
            res[i++] = (len >>> 24) & 0xff;
            res[i++] = 0;
            res[i++] = 0;
            res[i++] = 0;
            res[i++] = 0;
            for (t = 8; t < this.padLength; t++)
                res[i++] = 0;
        }
        return res;
    }
}
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