ssh-pub-key-validation/lib/ssh_pub_key_validation.js

Function for validate openssh public key

// Generated by CoffeeScript 1.6.3
var atob, isKeyValid;

isKeyValid = function(rawKey) {
  var checkIntregers, error, getBytesAndSplit, humanType, keyBase64, keyBody, keyBytes, keyTokens, typeSizeParse, _textTail, _type;
  getBytesAndSplit = function(bytes) {
    var bytesAndTail, integerBytes, size, sizeBytes, sizeLen, tail;
    sizeLen = 4;
    if (bytes.length < sizeLen + 1) {
      return false;
    }
    sizeBytes = bytes.slice(0, sizeLen);
    bytesAndTail = bytes.slice(sizeLen);
    size = ((sizeBytes.charCodeAt(0) << (8 * 3)) + (sizeBytes.charCodeAt(1) << (8 * 2))) + (sizeBytes.charCodeAt(2) << (8 * 1)) + (sizeBytes.charCodeAt(3) << (8 * 0));
    if (bytesAndTail.length < size) {
      return false;
    }
    integerBytes = bytesAndTail.slice(0, size);
    tail = bytesAndTail.slice(size);
    return [integerBytes, tail];
  };
  checkIntregers = function(num, bytes) {
    var result, _i, _int, _intNum;
    for (_intNum = _i = 0; 0 <= num ? _i < num : _i > num; _intNum = 0 <= num ? ++_i : --_i) {
      result = getBytesAndSplit(bytes);
      if (result === false) {
        return false;
      }
      _int = result[0], bytes = result[1];
    }
    return bytes.length === 0;
  };
  keyTokens = rawKey.trim().split(" ");
  if (keyTokens.length < 2) {
    return false;
  }
  humanType = keyTokens[0], keyBase64 = keyTokens[1], _textTail = keyTokens[2];
  if (humanType !== "ssh-rsa" && humanType !== "ssh-dss") {
    return false;
  }
  try {
    keyBytes = atob(keyBase64);
  } catch (_error) {
    error = _error;
    return false;
  }
  typeSizeParse = getBytesAndSplit(keyBytes);
  if (!typeSizeParse) {
    return false;
  }
  _type = typeSizeParse[0], keyBody = typeSizeParse[1];
  switch (humanType) {
    case "ssh-rsa":
      return checkIntregers(2, keyBody);
    case "ssh-dss":
      return checkIntregers(4, keyBody);
    default:
      return false;
  }
};

if (typeof module !== "undefined" && module.exports) {
  atob = require("atob");
  module.exports.isKeyValid = isKeyValid;
}