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(" ");
}