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Viewing file:     RawSha256.js (5.01 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.RawSha256 = void 0;
var constants_1 = require("./constants");
/**
 * @internal
 */
var RawSha256 = /** @class */ (function () {
    function RawSha256() {
        this.state = Int32Array.from(constants_1.INIT);
        this.temp = new Int32Array(64);
        this.buffer = new Uint8Array(64);
        this.bufferLength = 0;
        this.bytesHashed = 0;
        /**
         * @internal
         */
        this.finished = false;
    }
    RawSha256.prototype.update = function (data) {
        if (this.finished) {
            throw new Error("Attempted to update an already finished hash.");
        }
        var position = 0;
        var byteLength = data.byteLength;
        this.bytesHashed += byteLength;
        if (this.bytesHashed * 8 > constants_1.MAX_HASHABLE_LENGTH) {
            throw new Error("Cannot hash more than 2^53 - 1 bits");
        }
        while (byteLength > 0) {
            this.buffer[this.bufferLength++] = data[position++];
            byteLength--;
            if (this.bufferLength === constants_1.BLOCK_SIZE) {
                this.hashBuffer();
                this.bufferLength = 0;
            }
        }
    };
    RawSha256.prototype.digest = function () {
        if (!this.finished) {
            var bitsHashed = this.bytesHashed * 8;
            var bufferView = new DataView(this.buffer.buffer, this.buffer.byteOffset, this.buffer.byteLength);
            var undecoratedLength = this.bufferLength;
            bufferView.setUint8(this.bufferLength++, 0x80);
            // Ensure the final block has enough room for the hashed length
            if (undecoratedLength % constants_1.BLOCK_SIZE >= constants_1.BLOCK_SIZE - 8) {
                for (var i = this.bufferLength; i < constants_1.BLOCK_SIZE; i++) {
                    bufferView.setUint8(i, 0);
                }
                this.hashBuffer();
                this.bufferLength = 0;
            }
            for (var i = this.bufferLength; i < constants_1.BLOCK_SIZE - 8; i++) {
                bufferView.setUint8(i, 0);
            }
            bufferView.setUint32(constants_1.BLOCK_SIZE - 8, Math.floor(bitsHashed / 0x100000000), true);
            bufferView.setUint32(constants_1.BLOCK_SIZE - 4, bitsHashed);
            this.hashBuffer();
            this.finished = true;
        }
        // The value in state is little-endian rather than big-endian, so flip
        // each word into a new Uint8Array
        var out = new Uint8Array(constants_1.DIGEST_LENGTH);
        for (var i = 0; i < 8; i++) {
            out[i * 4] = (this.state[i] >>> 24) & 0xff;
            out[i * 4 + 1] = (this.state[i] >>> 16) & 0xff;
            out[i * 4 + 2] = (this.state[i] >>> 8) & 0xff;
            out[i * 4 + 3] = (this.state[i] >>> 0) & 0xff;
        }
        return out;
    };
    RawSha256.prototype.hashBuffer = function () {
        var _a = this, buffer = _a.buffer, state = _a.state;
        var state0 = state[0], state1 = state[1], state2 = state[2], state3 = state[3], state4 = state[4], state5 = state[5], state6 = state[6], state7 = state[7];
        for (var i = 0; i < constants_1.BLOCK_SIZE; i++) {
            if (i < 16) {
                this.temp[i] =
                    ((buffer[i * 4] & 0xff) << 24) |
                        ((buffer[i * 4 + 1] & 0xff) << 16) |
                        ((buffer[i * 4 + 2] & 0xff) << 8) |
                        (buffer[i * 4 + 3] & 0xff);
            }
            else {
                var u = this.temp[i - 2];
                var t1_1 = ((u >>> 17) | (u << 15)) ^ ((u >>> 19) | (u << 13)) ^ (u >>> 10);
                u = this.temp[i - 15];
                var t2_1 = ((u >>> 7) | (u << 25)) ^ ((u >>> 18) | (u << 14)) ^ (u >>> 3);
                this.temp[i] =
                    ((t1_1 + this.temp[i - 7]) | 0) + ((t2_1 + this.temp[i - 16]) | 0);
            }
            var t1 = ((((((state4 >>> 6) | (state4 << 26)) ^
                ((state4 >>> 11) | (state4 << 21)) ^
                ((state4 >>> 25) | (state4 << 7))) +
                ((state4 & state5) ^ (~state4 & state6))) |
                0) +
                ((state7 + ((constants_1.KEY[i] + this.temp[i]) | 0)) | 0)) |
                0;
            var t2 = ((((state0 >>> 2) | (state0 << 30)) ^
                ((state0 >>> 13) | (state0 << 19)) ^
                ((state0 >>> 22) | (state0 << 10))) +
                ((state0 & state1) ^ (state0 & state2) ^ (state1 & state2))) |
                0;
            state7 = state6;
            state6 = state5;
            state5 = state4;
            state4 = (state3 + t1) | 0;
            state3 = state2;
            state2 = state1;
            state1 = state0;
            state0 = (t1 + t2) | 0;
        }
        state[0] += state0;
        state[1] += state1;
        state[2] += state2;
        state[3] += state3;
        state[4] += state4;
        state[5] += state5;
        state[6] += state6;
        state[7] += state7;
    };
    return RawSha256;
}());
exports.RawSha256 = RawSha256;
//# sourceMappingURL=RawSha256.js.map