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// A base64 implementation for the bcrypt algorithm. This is partly non-standard.
/**
* bcrypt's own non-standard base64 dictionary.
* @type {!Array.<string>}
* @const
* @inner
**/
var BASE64_CODE = "./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789".split('');
/**
* @type {!Array.<number>}
* @const
* @inner
**/
var BASE64_INDEX = [-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0,
1, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, -1, -1, -1, -1, -1, -1,
-1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 25, 26, 27, -1, -1, -1, -1, -1, -1, 28, 29, 30,
31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, -1, -1, -1, -1, -1];
/**
* @type {!function(...number):string}
* @inner
*/
var stringFromCharCode = String.fromCharCode;
/**
* Encodes a byte array to base64 with up to len bytes of input.
* @param {!Array.<number>} b Byte array
* @param {number} len Maximum input length
* @returns {string}
* @inner
*/
function base64_encode(b, len) {
var off = 0,
rs = [],
c1, c2;
if (len <= 0 || len > b.length)
throw Error("Illegal len: "+len);
while (off < len) {
c1 = b[off++] & 0xff;
rs.push(BASE64_CODE[(c1 >> 2) & 0x3f]);
c1 = (c1 & 0x03) << 4;
if (off >= len) {
rs.push(BASE64_CODE[c1 & 0x3f]);
break;
}
c2 = b[off++] & 0xff;
c1 |= (c2 >> 4) & 0x0f;
rs.push(BASE64_CODE[c1 & 0x3f]);
c1 = (c2 & 0x0f) << 2;
if (off >= len) {
rs.push(BASE64_CODE[c1 & 0x3f]);
break;
}
c2 = b[off++] & 0xff;
c1 |= (c2 >> 6) & 0x03;
rs.push(BASE64_CODE[c1 & 0x3f]);
rs.push(BASE64_CODE[c2 & 0x3f]);
}
return rs.join('');
}
/**
* Decodes a base64 encoded string to up to len bytes of output.
* @param {string} s String to decode
* @param {number} len Maximum output length
* @returns {!Array.<number>}
* @inner
*/
function base64_decode(s, len) {
var off = 0,
slen = s.length,
olen = 0,
rs = [],
c1, c2, c3, c4, o, code;
if (len <= 0)
throw Error("Illegal len: "+len);
while (off < slen - 1 && olen < len) {
code = s.charCodeAt(off++);
c1 = code < BASE64_INDEX.length ? BASE64_INDEX[code] : -1;
code = s.charCodeAt(off++);
c2 = code < BASE64_INDEX.length ? BASE64_INDEX[code] : -1;
if (c1 == -1 || c2 == -1)
break;
o = (c1 << 2) >>> 0;
o |= (c2 & 0x30) >> 4;
rs.push(stringFromCharCode(o));
if (++olen >= len || off >= slen)
break;
code = s.charCodeAt(off++);
c3 = code < BASE64_INDEX.length ? BASE64_INDEX[code] : -1;
if (c3 == -1)
break;
o = ((c2 & 0x0f) << 4) >>> 0;
o |= (c3 & 0x3c) >> 2;
rs.push(stringFromCharCode(o));
if (++olen >= len || off >= slen)
break;
code = s.charCodeAt(off++);
c4 = code < BASE64_INDEX.length ? BASE64_INDEX[code] : -1;
o = ((c3 & 0x03) << 6) >>> 0;
o |= c4;
rs.push(stringFromCharCode(o));
++olen;
}
var res = [];
for (off = 0; off<olen; off++)
res.push(rs[off].charCodeAt(0));
return res;
}