| // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| class _LineWrappingStringBuffer { |
| _LineWrappingStringBuffer(int this._lineLength) : _sb = new StringBuffer(); |
| |
| void add(String s) { |
| if (_lineLength !== null && _currentLineLength == _lineLength) { |
| _sb.add('\r\n'); |
| _currentLineLength = 0; |
| } |
| _sb.add(s); |
| _currentLineLength++; |
| } |
| |
| String toString() => _sb.toString(); |
| |
| int _lineLength; |
| StringBuffer _sb; |
| int _currentLineLength = 0; |
| } |
| |
| class _CryptoUtils { |
| static String bytesToHex(List<int> bytes) { |
| var result = new StringBuffer(); |
| for (var part in bytes) { |
| result.add('${part < 16 ? '0' : ''}${part.toRadixString(16)}'); |
| } |
| return result.toString(); |
| } |
| |
| static String bytesToBase64(List<int> bytes, [int lineLength]) { |
| final table = |
| const [ 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', |
| 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', |
| 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', |
| 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', |
| 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', |
| '8', '9', '+', '/' ]; |
| |
| var result = new _LineWrappingStringBuffer(lineLength); |
| |
| // Encode all full 24-bit blocks. |
| var i = 0; |
| for (; (i + 2) < bytes.length; i += 3) { |
| var b0 = bytes[i] & 0xff; |
| var b1 = bytes[i + 1] & 0xff; |
| var b2 = bytes[i + 2] & 0xff; |
| result.add(table[b0 >> 2]); |
| result.add(table[((b0 << 4) | (b1 >> 4)) & 0x3f]); |
| result.add(table[((b1 << 2) | (b2 >> 6)) & 0x3f]); |
| result.add(table[b2 & 0x3f]); |
| } |
| |
| // Deal with the last non-full block if any and add padding '='. |
| if (i == bytes.length - 1) { |
| var b0 = bytes[i] & 0xff; |
| result.add(table[b0 >> 2]); |
| result.add(table[(b0 << 4) & 0x3f]); |
| result.add('='); |
| result.add('='); |
| } else if (i == bytes.length - 2) { |
| var b0 = bytes[i] & 0xff; |
| var b1 = bytes[i + 1] & 0xff; |
| result.add(table[b0 >> 2]); |
| result.add(table[((b0 << 4) | (b1 >> 4)) & 0x3f]); |
| result.add(table[(b1 << 2) & 0x3f]); |
| result.add('='); |
| } |
| |
| return result.toString(); |
| } |
| } |