liberama/client/share/sjclWrapper.js

//sjcl.js подправлен (убран лишний require, добавлявший +400kb к bundle) и скопирован локально
import sjcl from './sjcl';

//везде недоработки...

sjcl.codec.bytes = {
  fromBits: function(arr) {
    var out = [], bl = sjcl.bitArray.bitLength(arr), i, tmp;
    for (i=0; i<bl/8; i++) {
      if ((i&3) === 0) {
        tmp = arr[i/4];
      }
      out.push(tmp >>> 24);
      tmp <<= 8;
    }
    return out;
  },
  toBits: function(bytes) {
    var out = [], i, tmp=0;
    for (i=0; i<bytes.length; i++) {
      tmp = tmp << 8 | bytes[i];
      if ((i&3) === 3) {
        out.push(tmp);
        tmp = 0;
      }
    }
    if (i&3) {
      out.push(sjcl.bitArray.partial(8*(i&3), tmp));
    }
    return out;
  }
};

sjcl.json._add = function(target, src, requireSame) {
    if (target === undefined) { target = {}; }
    if (src === undefined) { return target; }
    var i;
    for (i in src) {
      if (src.hasOwnProperty(i)) {
        if (requireSame && target[i] !== undefined && target[i] !== src[i]) {
          throw new sjcl.exception.invalid("required parameter overridden");
        }
        target[i] = src[i];
      }
    }
    return target;
}

sjcl.encryptArray = function(password, plaintext, params, rp) {
    params = params || {};
    rp = rp || {};

    var j = sjcl.json, p = j._add({ iv: sjcl.random.randomWords(4,0) },
                                  j.defaults), tmp, prp, adata;
    j._add(p, params);
    adata = p.adata;
    if (typeof p.salt === "string") {
      p.salt = sjcl.codec.base64.toBits(p.salt);
    }
    if (typeof p.iv === "string") {
      p.iv = sjcl.codec.base64.toBits(p.iv);
    }

    if (!sjcl.mode[p.mode] ||
        !sjcl.cipher[p.cipher] ||
        (typeof password === "string" && p.iter <= 100) ||
        (p.ts !== 64 && p.ts !== 96 && p.ts !== 128) ||
        (p.ks !== 128 && p.ks !== 192 && p.ks !== 256) ||
        (p.iv.length < 2 || p.iv.length > 4)) {
      throw new sjcl.exception.invalid("json encrypt: invalid parameters");
    }

    if (typeof password === "string") {
      tmp = sjcl.misc.cachedPbkdf2(password, p);
      password = tmp.key.slice(0,p.ks/32);
      p.salt = tmp.salt;
    } else if (sjcl.ecc && password instanceof sjcl.ecc.elGamal.publicKey) {
      tmp = password.kem();
      p.kemtag = tmp.tag;
      password = tmp.key.slice(0,p.ks/32);
    }
    if (typeof plaintext === "string") {
      plaintext = sjcl.codec.utf8String.toBits(plaintext);
    }
    if (typeof adata === "string") {
      p.adata = adata = sjcl.codec.utf8String.toBits(adata);
    }
    prp = new sjcl.cipher[p.cipher](password);

    j._add(rp, p);
    rp.key = password;

    /* do the encryption */
    if (p.mode === "ccm" && sjcl.arrayBuffer && sjcl.arrayBuffer.ccm && plaintext instanceof ArrayBuffer) {
      p.ct = sjcl.arrayBuffer.ccm.encrypt(prp, plaintext, p.iv, adata, p.ts);
    } else {
      p.ct = sjcl.mode[p.mode].encrypt(prp, plaintext, p.iv, adata, p.ts);
    }

    return p;
}

sjcl.decryptArray = function(password, ciphertext, params) {
    params = params || {};

    var j = sjcl.json, p = j._add(j._add(j._add({},j.defaults),ciphertext), params, true), ct, tmp, prp, adata=p.adata;
    if (typeof p.salt === "string") {
      p.salt = sjcl.codec.base64.toBits(p.salt);
    }
    if (typeof p.iv === "string") {
      p.iv = sjcl.codec.base64.toBits(p.iv);
    }

    if (!sjcl.mode[p.mode] ||
        !sjcl.cipher[p.cipher] ||
        (typeof password === "string" && p.iter <= 100) ||
        (p.ts !== 64 && p.ts !== 96 && p.ts !== 128) ||
        (p.ks !== 128 && p.ks !== 192 && p.ks !== 256) ||
        (!p.iv) ||
        (p.iv.length < 2 || p.iv.length > 4)) {
      throw new sjcl.exception.invalid("json decrypt: invalid parameters");
    }

    if (typeof password === "string") {
      tmp = sjcl.misc.cachedPbkdf2(password, p);
      password = tmp.key.slice(0,p.ks/32);
      p.salt  = tmp.salt;
    } else if (sjcl.ecc && password instanceof sjcl.ecc.elGamal.secretKey) {
      password = password.unkem(sjcl.codec.base64.toBits(p.kemtag)).slice(0,p.ks/32);
    }
    if (typeof adata === "string") {
      adata = sjcl.codec.utf8String.toBits(adata);
    }
    prp = new sjcl.cipher[p.cipher](password);

    /* do the decryption */
    if (p.mode === "ccm" && sjcl.arrayBuffer && sjcl.arrayBuffer.ccm && p.ct instanceof ArrayBuffer) {
      ct = sjcl.arrayBuffer.ccm.decrypt(prp, p.ct, p.iv, p.tag, adata, p.ts);
    } else {
      ct = sjcl.mode[p.mode].decrypt(prp, p.ct, p.iv, adata, p.ts);
    }

    return ct;
}

export default sjcl;