encodetostring - javascript var base64

HEX al convertidor de Base64 para JavaScript

Question

¿Alguien sabe de un buen fragmento de código JavaScript para convertir cadenas codificadas HEX en cadenas codificadas en base64 ?

Answer 1

El excelente comentario de @dandavis es modificado por y tiene algunos caracteres ocultos extraños.

Aquí está como un trazador de líneas:

btoa("a6b580481008e60df9350de170b7e728".match(//w{2}/g).map(function(a){return String.fromCharCode(parseInt(a, 16));} ).join(""))

o:

function hexToBase64(hexstring) {
    return btoa(hexstring.match(//w{2}/g).map(function(a) {
        return String.fromCharCode(parseInt(a, 16));
    }).join(""));
}

hexToBase64("a6b580481008e60df9350de170b7e728");

Ambos vuelven:

"prWASBAI5g35NQ3hcLfnKA=="

Answer 2

Si está trabajando en Node o utilizando Browserify, puede usar

var base64String = Buffer.from(hexString, ''hex'').toString(''base64'')

o

var hexString = Buffer.from(base64String, ''base64'').toString(''hex'')

Answer 3

if (!window.atob) {
  var tableStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  var table = tableStr.split("");

  window.atob = function (base64) {
    if (/(=[^=]+|={3,})$/.test(base64)) throw new Error("String contains an invalid character");
    base64 = base64.replace(/=/g, "");
    var n = base64.length & 3;
    if (n === 1) throw new Error("String contains an invalid character");
    for (var i = 0, j = 0, len = base64.length / 4, bin = []; i < len; ++i) {
      var a = tableStr.indexOf(base64[j++] || "A"), b = tableStr.indexOf(base64[j++] || "A");
      var c = tableStr.indexOf(base64[j++] || "A"), d = tableStr.indexOf(base64[j++] || "A");
      if ((a | b | c | d) < 0) throw new Error("String contains an invalid character");
      bin[bin.length] = ((a << 2) | (b >> 4)) & 255;
      bin[bin.length] = ((b << 4) | (c >> 2)) & 255;
      bin[bin.length] = ((c << 6) | d) & 255;
    };
    return String.fromCharCode.apply(null, bin).substr(0, bin.length + n - 4);
  };

  window.btoa = function (bin) {
    for (var i = 0, j = 0, len = bin.length / 3, base64 = []; i < len; ++i) {
      var a = bin.charCodeAt(j++), b = bin.charCodeAt(j++), c = bin.charCodeAt(j++);
      if ((a | b | c) > 255) throw new Error("String contains an invalid character");
      base64[base64.length] = table[a >> 2] + table[((a << 4) & 63) | (b >> 4)] +
                              (isNaN(b) ? "=" : table[((b << 2) & 63) | (c >> 6)]) +
                              (isNaN(b + c) ? "=" : table[c & 63]);
    }
    return base64.join("");
  };

}

function hexToBase64(str) {
  return btoa(String.fromCharCode.apply(null,
    str.replace(//r|/n/g, "").replace(/([/da-fA-F]{2}) ?/g, "0x$1 ").replace(/ +$/, "").split(" "))
  );
}

function base64ToHex(str) {
  for (var i = 0, bin = atob(str.replace(/[ /r/n]+$/, "")), hex = []; i < bin.length; ++i) {
    var tmp = bin.charCodeAt(i).toString(16);
    if (tmp.length === 1) tmp = "0" + tmp;
    hex[hex.length] = tmp;
  }
  return hex.join(" ");
}