Index: lib/src/crypto_utils.dart |
diff --git a/lib/src/crypto_utils.dart b/lib/src/crypto_utils.dart |
index 515c1e95eaffa121ac3482497adb86d3efc1acfd..7111d6f4b593701cd9374db1a662b75fbdbd0276 100644 |
--- a/lib/src/crypto_utils.dart |
+++ b/lib/src/crypto_utils.dart |
@@ -13,148 +13,15 @@ abstract class _CryptoUtils { |
return result.toString(); |
} |
- static const int PAD = 61; // '=' |
- static const int CR = 13; // '\r' |
- static const int LF = 10; // '\n' |
- static const int LINE_LENGTH = 76; |
- |
- static const String _encodeTable = |
- "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
- |
- static const String _encodeTableUrlSafe = |
- "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"; |
- |
- // Lookup table used for finding Base 64 alphabet index of a given byte. |
- // -2 : Outside Base 64 alphabet. |
- // -1 : '\r' or '\n' |
- // 0 : = (Padding character). |
- // >0 : Base 64 alphabet index of given byte. |
- static const List<int> _decodeTable = |
- const [ -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -2, -2, -1, -2, -2, |
- -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, |
- -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 62, -2, 62, -2, 63, |
- 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -2, -2, -2, 0, -2, -2, |
- -2, 0, 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, -2, -2, -2, -2, 63, |
- -2, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, |
- 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -2, -2, -2, -2, -2, |
- -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, |
- -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, |
- -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, |
- -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, |
- -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, |
- -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, |
- -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, |
- -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2 ]; |
- |
static String bytesToBase64(List<int> bytes, |
[bool urlSafe = false, |
bool addLineSeparator = false]) { |
- int len = bytes.length; |
- if (len == 0) { |
- return ""; |
- } |
- final String lookup = urlSafe ? _encodeTableUrlSafe : _encodeTable; |
- // Size of 24 bit chunks. |
- final int remainderLength = len.remainder(3); |
- final int chunkLength = len - remainderLength; |
- // Size of base output. |
- int outputLen = ((len ~/ 3) * 4) + ((remainderLength > 0) ? 4 : 0); |
- // Add extra for line separators. |
- if (addLineSeparator) { |
- outputLen += ((outputLen - 1) ~/ LINE_LENGTH) << 1; |
- } |
- List<int> out = new List<int>(outputLen); |
- |
- // Encode 24 bit chunks. |
- int j = 0, i = 0, c = 0; |
- while (i < chunkLength) { |
- int x = ((bytes[i++] << 16) & 0xFFFFFF) | |
- ((bytes[i++] << 8) & 0xFFFFFF) | |
- bytes[i++]; |
- out[j++] = lookup.codeUnitAt(x >> 18); |
- out[j++] = lookup.codeUnitAt((x >> 12) & 0x3F); |
- out[j++] = lookup.codeUnitAt((x >> 6) & 0x3F); |
- out[j++] = lookup.codeUnitAt(x & 0x3f); |
- // Add optional line separator for each 76 char output. |
- if (addLineSeparator && ++c == 19 && j < outputLen - 2) { |
- out[j++] = CR; |
- out[j++] = LF; |
- c = 0; |
- } |
- } |
- |
- // If input length if not a multiple of 3, encode remaining bytes and |
- // add padding. |
- if (remainderLength == 1) { |
- int x = bytes[i]; |
- out[j++] = lookup.codeUnitAt(x >> 2); |
- out[j++] = lookup.codeUnitAt((x << 4) & 0x3F); |
- out[j++] = PAD; |
- out[j++] = PAD; |
- } else if (remainderLength == 2) { |
- int x = bytes[i]; |
- int y = bytes[i + 1]; |
- out[j++] = lookup.codeUnitAt(x >> 2); |
- out[j++] = lookup.codeUnitAt(((x << 4) | (y >> 4)) & 0x3F); |
- out[j++] = lookup.codeUnitAt((y << 2) & 0x3F); |
- out[j++] = PAD; |
- } |
- |
- return new String.fromCharCodes(out); |
+ return BASE64.encode(bytes, |
+ urlSafe: urlSafe, |
+ addLineSeparator: addLineSeparator); |
} |
static List<int> base64StringToBytes(String input) { |
- int len = input.length; |
- if (len == 0) { |
- return new List<int>(0); |
- } |
- |
- // Count '\r', '\n' and illegal characters, For illegal characters, |
- // throw an exception. |
- int extrasLen = 0; |
- for (int i = 0; i < len; i++) { |
- int c = _decodeTable[input.codeUnitAt(i)]; |
- if (c < 0) { |
- extrasLen++; |
- if (c == -2) { |
- throw new FormatException('Invalid character: ${input[i]}'); |
- } |
- } |
- } |
- |
- if ((len - extrasLen) % 4 != 0) { |
- throw new FormatException('''Size of Base 64 characters in Input |
- must be a multiple of 4. Input: $input'''); |
- } |
- |
- // Count pad characters. |
- int padLength = 0; |
- for (int i = len - 1; i >= 0; i--) { |
- int currentCodeUnit = input.codeUnitAt(i); |
- if (_decodeTable[currentCodeUnit] > 0) break; |
- if (currentCodeUnit == PAD) padLength++; |
- } |
- int outputLen = (((len - extrasLen) * 6) >> 3) - padLength; |
- List<int> out = new List<int>(outputLen); |
- |
- for (int i = 0, o = 0; o < outputLen; ) { |
- // Accumulate 4 valid 6 bit Base 64 characters into an int. |
- int x = 0; |
- for (int j = 4; j > 0; ) { |
- int c = _decodeTable[input.codeUnitAt(i++)]; |
- if (c >= 0) { |
- x = ((x << 6) & 0xFFFFFF) | c; |
- j--; |
- } |
- } |
- out[o++] = x >> 16; |
- if (o < outputLen) { |
- out[o++] = (x >> 8) & 0xFF; |
- if (o < outputLen) out[o++] = x & 0xFF; |
- } |
- } |
- return out; |
+ return BASE64.decode(input); |
} |
- |
} |