前置条件
- ubuntu 24.04.2 LTS
- Visual Studio Code 1.98.2
- Android Studio Meerkat | 2024.3.1
- Flutter 3.29.1
问题描述
在使用 Flutter 编写代码的时候，如下代码进行格式化
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final List<String> symbols = ["+", "@", "\\", "/", "*", "#", "\$", "&", "%"]; final List<String> digits = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]; |
可以发现格式化后的结果变成了如下的样子：
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final List<String> symbols = ["+", "@", "\\", "/", "*", "#", "\$", "&", "%"]; final List<String> digits = [ "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" ]; |
这部分代码我们不希望格式化，尤其是编写加解密算法的时候，里面的置换数组格式化之后会完全乱掉。
可以使用
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// @formatter:off .......................... // @formatter:on |
阻止格式化工具对具体代码块格式化。
比如如下代码：
sm4.dart
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import 'dart:convert'; import 'package:convert/convert.dart'; // ignore: constant_identifier_names enum SM4CryptoMode { ECB, CBC } class SM4 { // @formatter:off // ignore: constant_identifier_names static const List<int> S_BOX = [ 0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05, 0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99, 0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62, 0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6, 0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8, 0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35, 0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87, 0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e, 0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1, 0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3, 0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f, 0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51, 0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8, 0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0, 0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84, 0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48 ]; // ignore: constant_identifier_names static const List<int> FK = [ 0xA3B1BAC6, 0x56AA3350, 0x677D9197, 0xB27022DC ]; // ignore: constant_identifier_names static const List<int> CK = [ 0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269, 0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9, 0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249, 0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9, 0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229, 0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299, 0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209, 0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279 ]; // @formatter: on // ignore: constant_identifier_names static const int SM4_ENCRYPT = 1; // ignore: constant_identifier_names static const int SM4_DECRYPT = 0; static const int blockSize = 16; static final _encryptKey = List<int>.filled(32, 0); static final _decryptKey = List<int>.filled(32, 0); static int _leftShift(int x, int n ) { int s = n & 31; x = (x & 0xFFFFFFFF).toSigned(32); return (((x << s) | ((x & 0xFFFFFFFF) >> (32 - s))) & 0xFFFFFFFF) .toSigned(32); } static int _readUint32BE(List<int> b, int i) { return ((b[i] & 0xff) << 24) | ((b[i + 1] & 0xff) << 16) | ((b[i + 2] & 0xff) << 8) | (b[i + 3] & 0xff); } static void _writeUint32BE(int n, List<int> b, int i) { b[i] = ((n >> 24) & 0xff); b[i + 1] = ((n >> 16) & 0xff); b[i + 2] = ((n >> 8) & 0xff); b[i + 3] = n & 0xff; } static int _sBox(int inch) => S_BOX[inch & 0xFF]; static int _sm4F(int x0, int x1, int x2, int x3, int rk) { final x = x1 ^ x2 ^ x3 ^ rk; int bb = 0; int c = 0; List<int> a = List<int>.filled(4, 0); List<int> b = List<int>.filled(4, 0); _writeUint32BE(x, a, 0); b[0] = _sBox(a[0]); b[1] = _sBox(a[1]); b[2] = _sBox(a[2]); b[3] = _sBox(a[3]); bb = _readUint32BE(b, 0); c = bb ^ _leftShift(bb, 2) ^ _leftShift(bb, 10) ^ _leftShift(bb, 18) ^ _leftShift(bb, 24); return x0 ^ c; } static int _calculateRoundKey(int key) { int roundKey = 0; List<int> keyBytes = List<int>.filled(4, 0); List<int> sBoxBytes = List<int>.filled(4, 0); _writeUint32BE(key, keyBytes, 0); for (int i = 0; i < 4; i++) { sBoxBytes[i] = _sBox(keyBytes[i]); } int temp = _readUint32BE(sBoxBytes, 0); roundKey = temp ^ _leftShift(temp, 13) ^ _leftShift(temp, 23); return roundKey; } static void setKey(String key) { final List<int> keyBytes = utf8.encoder.convert(key); final List<int> intermediateKeys = List<int>.filled(36, 0); for (int i = 0; i < 4; i++) { intermediateKeys[i] = _readUint32BE(keyBytes, i * 4) ^ FK[i]; } for (int i = 0; i < 32; i++) { intermediateKeys[i + 4] = intermediateKeys[i] ^ _calculateRoundKey(intermediateKeys[i + 1] ^ intermediateKeys[i + 2] ^ intermediateKeys[i + 3] ^ CK[i]); _encryptKey[i] = intermediateKeys[i + 4]; } for (int i = 0; i < 16; i++) { int temp = _encryptKey[i]; _decryptKey[i] = _encryptKey[31 - i]; _decryptKey[31 - i] = temp; } } static void _round(List<int> sk, List<int> input, List<int> output) { int i = 0; final List<int> buf = List<int>.filled(36, 0); buf[0] = _readUint32BE(input, 0); buf[1] = _readUint32BE(input, 4); buf[2] = _readUint32BE(input, 8); buf[3] = _readUint32BE(input, 12); while (i < 32) { buf[i + 4] = _sm4F(buf[i], buf[i + 1], buf[i + 2], buf[i + 3], sk[i]); i++; } _writeUint32BE(buf[35], output, 0); _writeUint32BE(buf[34], output, 4); _writeUint32BE(buf[33], output, 8); _writeUint32BE(buf[32], output, 12); } static List<int> _padding(List<int> input, int mode) { final int padLen = blockSize - (input.length % blockSize); if (mode == SM4_ENCRYPT) { final paddedList = List<int>.filled(input.length + padLen, 0); paddedList.setRange(0, input.length, input); for (int i = input.length; i < paddedList.length; i++) { paddedList[i] = padLen; } return paddedList; } else { final lastByte = input.last; final cutLen = input.length - lastByte; return input.sublist(0, cutLen); } } static List<int> crypto( List<int> data, int flag, SM4CryptoMode mode, String? iv) { late List<int> lastVector; if (mode == SM4CryptoMode.CBC) { if (iv == null || iv.length != 32) { throw Exception("IV must be a string of length 16"); } else { lastVector = hex.decoder.convert(iv); } } final key = (flag == SM4_ENCRYPT) ? _encryptKey : _decryptKey; if (flag == SM4_ENCRYPT) { data = _padding(data, SM4_ENCRYPT); } final length = data.length; final List<int> output = []; for (int offset = 0; offset < length; offset += blockSize) { final outData = List<int>.filled(blockSize, 0); final copyLen = (offset + blockSize <= length) ? blockSize : length - offset; final input = data.sublist(offset, offset + copyLen); if (mode == SM4CryptoMode.CBC && flag == SM4_ENCRYPT) { for (int i = 0; i < blockSize; i++) { input[i] = input[i] ^ lastVector[i]; } } _round(key, input, outData); if (mode == SM4CryptoMode.CBC && flag == SM4_DECRYPT) { for (int i = 0; i < blockSize; i++) { outData[i] ^= lastVector[i]; } } output.addAll(outData); if (mode == SM4CryptoMode.CBC) { if (flag == SM4_ENCRYPT) { lastVector = outData; } else { lastVector = input; } } } if (flag == SM4_DECRYPT) { return _padding(output, SM4_DECRYPT); } return output; } static String encrypt(String plainText, {String? key, SM4CryptoMode mode = SM4CryptoMode.ECB, String? iv}) { if (key != null) setKey(key); final List<int> input = utf8.encode(plainText); final List<int> output = crypto(input, SM4_ENCRYPT, mode, iv); return hex.encoder.convert(output); } static decrypt(String cipherText, {String? key, SM4CryptoMode mode = SM4CryptoMode.ECB, String? iv}) { if (key != null) setKey(key); List<int> input = hex.decoder.convert(cipherText); List<int> output = crypto(input, SM4_DECRYPT, mode, iv); return utf8.decode(output); } } |