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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/asmcrypto.js/src/rsa

Просмотр файла: rsa.js

import { BigNumber, is_big_number, Modulus } from '../bignum/bignum';
import { is_buffer, is_bytes, is_string, string_to_bytes } from '../utils';
import { IllegalStateError } from '../errors';

export function RSA(options) {
  options = options || {};

  this.key = null;
  this.result = null;

  this.reset(options);
}

export function RSA_reset(options) {
  options = options || {};

  this.result = null;

  var key = options.key;
  if (key !== undefined) {
    if (key instanceof Array) {
      var l = key.length;
      if (l !== 2 && l !== 3 && l !== 8) throw new SyntaxError('unexpected key type');

      var k = [];
      k[0] = new Modulus(new BigNumber(key[0]));
      k[1] = new BigNumber(key[1]);
      if (l > 2) {
        k[2] = new BigNumber(key[2]);
      }
      if (l > 3) {
        k[3] = new Modulus(new BigNumber(key[3]));
        k[4] = new Modulus(new BigNumber(key[4]));
        k[5] = new BigNumber(key[5]);
        k[6] = new BigNumber(key[6]);
        k[7] = new BigNumber(key[7]);
      }

      this.key = k;
    } else {
      throw new TypeError('unexpected key type');
    }
  }

  return this;
}

export function RSA_encrypt(data) {
  if (!this.key) throw new IllegalStateError('no key is associated with the instance');

  if (is_string(data)) data = string_to_bytes(data);

  if (is_buffer(data)) data = new Uint8Array(data);

  var msg;
  if (is_bytes(data)) {
    msg = new BigNumber(data);
  } else if (is_big_number(data)) {
    msg = data;
  } else {
    throw new TypeError('unexpected data type');
  }

  if (this.key[0].compare(msg) <= 0) throw new RangeError('data too large');

  var m = this.key[0],
    e = this.key[1];

  var result = m.power(msg, e).toBytes();

  var bytelen = (m.bitLength + 7) >> 3;
  if (result.length < bytelen) {
    var r = new Uint8Array(bytelen);
    r.set(result, bytelen - result.length);
    result = r;
  }

  this.result = result;

  return this;
}

export function RSA_decrypt(data) {
  if (!this.key) throw new IllegalStateError('no key is associated with the instance');

  if (this.key.length < 3) throw new IllegalStateError("key isn't suitable for decription");

  if (is_string(data)) data = string_to_bytes(data);

  if (is_buffer(data)) data = new Uint8Array(data);

  var msg;
  if (is_bytes(data)) {
    msg = new BigNumber(data);
  } else if (is_big_number(data)) {
    msg = data;
  } else {
    throw new TypeError('unexpected data type');
  }

  if (this.key[0].compare(msg) <= 0) throw new RangeError('data too large');

  var result;
  if (this.key.length > 3) {
    var m = this.key[0],
      p = this.key[3],
      q = this.key[4],
      dp = this.key[5],
      dq = this.key[6],
      u = this.key[7];

    var x = p.power(msg, dp),
      y = q.power(msg, dq);

    var t = x.subtract(y);
    while (t.sign < 0) t = t.add(p);

    var h = p.reduce(u.multiply(t));

    result = h
      .multiply(q)
      .add(y)
      .clamp(m.bitLength)
      .toBytes();
  } else {
    var m = this.key[0],
      d = this.key[2];

    result = m.power(msg, d).toBytes();
  }

  var bytelen = (m.bitLength + 7) >> 3;
  if (result.length < bytelen) {
    var r = new Uint8Array(bytelen);
    r.set(result, bytelen - result.length);
    result = r;
  }

  this.result = result;

  return this;
}

var RSA_prototype = RSA.prototype;
RSA_prototype.reset = RSA_reset;
RSA_prototype.encrypt = RSA_encrypt;
RSA_prototype.decrypt = RSA_decrypt;

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