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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;
- }
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