Konwerter HEX na Base64 dla JavaScript

Question

Ktoś wie o dobrym fragmencie kodu JavaScript do przekonwertowania HEX zakodowanych łańcuchów do base64 zakodowanych ciągów znaków?

Answer 1

if (!window.atob) { 
    var tableStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz/"; 
    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(" "); 
} 

Answer 2

Jeśli pracujesz w węźle lub używając Browserify, można użyć

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

lub

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

Answer 3

Doskonała komentarz @dandavis jest modyfikowany przez StackOverflow, i ma jedne dziwne ukryte postacie.

Tu jest jednym z wkładką:

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

, czyli

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

hexToBase64("a6b580481008e60df9350de170b7e728"); 

zwracają:

"prWASBAI5g35NQ3hcLfnKA=="