@hackbg/miscreant-esm/src/internals/block.dist.cjs

(ESM port) Misuse resistant symmetric encryption library providing AES-SIV (RFC 5297), AES-PMAC-SIV, and STREAM constructions

"use strict";
Object.defineProperty(exports, "__esModule", {
  value: true
});
const constant_time_1 = require("./constant-time.dist.cjs");
const wipe_1 = require("./wipe.dist.cjs");
class Block {
  constructor() {
    this.data = new Uint8Array(Block.SIZE);
  }
  clear() {
    (0, wipe_1.wipe)(this.data);
  }
  clone() {
    const ret = new Block();
    ret.copy(this);
    return ret;
  }
  copy(other) {
    this.data.set(other.data);
  }
  dbl() {
    let carry = 0;
    for (let i = Block.SIZE - 1; i >= 0; i--) {
      const b = this.data[i] >>> 7 & 0xff;
      this.data[i] = this.data[i] << 1 | carry;
      carry = b;
    }
    this.data[Block.SIZE - 1] ^= (0, constant_time_1.select)(carry, Block.R, 0);
    carry = 0;
  }
}
Block.SIZE = 16;
Block.R = 0x87;
exports.default = Block;