实现python-hexlify,unhexlify方法

实现


// 等同 binascii.hexlify()
function hexlify(str) {
  var result = '';
  var padding = '00';
  for (var i=0, l=str.length; i<l; i++) {
    var digit = str.charCodeAt(i).toString(16);
    var padded = (padding+digit).slice(-2);
    result += padded;
  }
  return result;
}

// 等同 binascii.unhexlify()
function unhexlify(str) {
  var result = '';
  for (var i=0, l=str.length; i<l; i+=2) {
    result += String.fromCharCode(parseInt(str.substr(i, 2), 16));
  }
  return result;
}

举例

原python解密代码部分：

# str为加密后的数据
str = "xxx"
# 私钥
_key = "------BEGIN RSA PRIVATE KEY-----XXXXXA---"
hex_data = binascii.unhexlify(str)
...
_pwdHex = bytes.decode(hex_data)
...
_rsakey = RSA.importKey(_key)
_cipher = PKCS1_V1_5.new(_rsakey)
_text = _cipher.decrypt(base64.b16decode(_pwdHex), "ERROR")
result = _text.decode('utf-8')

nodejs写法：

// str为加密后的数据
const str = 'xxx';
// 私钥
const _key = "------BEGIN RSA PRIVATE KEY-----XXXXXA---";
// 等同于py的binascii.unhexlify(str)
const hex_data = unhexlify(str);
// 等同于py的base64.b16decode()
_pwdHex = Buffer.form(hex_data, 'hex');
_text = crypto.privateDecrypt({ 
  key: _key,
  padding: crypto.contants.RSA_PKCS1_PADDING
}, hex_data);
result = _text.toString()