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Directory : /var/app/comcon24/cms/node_modules/public-encrypt/

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Current File : /var/app/comcon24/cms/node_modules/public-encrypt/publicEncrypt.js

var parseKeys = require('parse-asn1')
var randomBytes = require('randombytes')
var createHash = require('create-hash')
var mgf = require('./mgf')
var xor = require('./xor')
var BN = require('bn.js')
var withPublic = require('./withPublic')
var crt = require('browserify-rsa')
var Buffer = require('safe-buffer').Buffer

module.exports = function publicEncrypt (publicKey, msg, reverse) {
  var padding
  if (publicKey.padding) {
    padding = publicKey.padding
  } else if (reverse) {
    padding = 1
  } else {
    padding = 4
  }
  var key = parseKeys(publicKey)
  var paddedMsg
  if (padding === 4) {
    paddedMsg = oaep(key, msg)
  } else if (padding === 1) {
    paddedMsg = pkcs1(key, msg, reverse)
  } else if (padding === 3) {
    paddedMsg = new BN(msg)
    if (paddedMsg.cmp(key.modulus) >= 0) {
      throw new Error('data too long for modulus')
    }
  } else {
    throw new Error('unknown padding')
  }
  if (reverse) {
    return crt(paddedMsg, key)
  } else {
    return withPublic(paddedMsg, key)
  }
}

function oaep (key, msg) {
  var k = key.modulus.byteLength()
  var mLen = msg.length
  var iHash = createHash('sha1').update(Buffer.alloc(0)).digest()
  var hLen = iHash.length
  var hLen2 = 2 * hLen
  if (mLen > k - hLen2 - 2) {
    throw new Error('message too long')
  }
  var ps = Buffer.alloc(k - mLen - hLen2 - 2)
  var dblen = k - hLen - 1
  var seed = randomBytes(hLen)
  var maskedDb = xor(Buffer.concat([iHash, ps, Buffer.alloc(1, 1), msg], dblen), mgf(seed, dblen))
  var maskedSeed = xor(seed, mgf(maskedDb, hLen))
  return new BN(Buffer.concat([Buffer.alloc(1), maskedSeed, maskedDb], k))
}
function pkcs1 (key, msg, reverse) {
  var mLen = msg.length
  var k = key.modulus.byteLength()
  if (mLen > k - 11) {
    throw new Error('message too long')
  }
  var ps
  if (reverse) {
    ps = Buffer.alloc(k - mLen - 3, 0xff)
  } else {
    ps = nonZero(k - mLen - 3)
  }
  return new BN(Buffer.concat([Buffer.from([0, reverse ? 1 : 2]), ps, Buffer.alloc(1), msg], k))
}
function nonZero (len) {
  var out = Buffer.allocUnsafe(len)
  var i = 0
  var cache = randomBytes(len * 2)
  var cur = 0
  var num
  while (i < len) {
    if (cur === cache.length) {
      cache = randomBytes(len * 2)
      cur = 0
    }
    num = cache[cur++]
    if (num) {
      out[i++] = num
    }
  }
  return out
}

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AnonSec Team