c# Base64解密加密
2021-07-08 19:05
阅读:751
标签:decode 加密 convert name break static ret bre ++
private static string base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; private static int[] base64DecodeChars ={ -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, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 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, -1, -1, -1, -1, -1, -1, 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, -1, -1, -1, -1, -1 };
////// Base64加密 /// /// /// public static string Base64Encode(string str) { string res = ""; int i = 0, len; int c1, c2, c3; len = str.Length; i = 0; res = ""; while (i len) { c1 = Convert.ToByte(str[i++]) & 0xff; if (i == len) { res += base64EncodeChars.CharAt(c1 >> 2); res += base64EncodeChars.CharAt((c1 & 0x3) 4); res += "=="; break; } c2 = Convert.ToByte(str[i++]); if (i == len) { res += base64EncodeChars.CharAt(c1 >> 2); res += base64EncodeChars.CharAt(((c1 & 0x3) 4) | ((c2 & 0xF0) >> 4)); res += base64EncodeChars.CharAt((c2 & 0xF) 2); res += "="; break; } c3 = Convert.ToByte(str[i++]); res += base64EncodeChars.CharAt(c1 >> 2); res += base64EncodeChars.CharAt(((c1 & 0x3) 4) | ((c2 & 0xF0) >> 4)); res += base64EncodeChars.CharAt(((c2 & 0xF) 2) | ((c3 & 0xC0) >> 6)); res += base64EncodeChars.CharAt(c3 & 0x3F); } return res; }
////// Base64加解密 /// /// /// public static string Base64Decode(string str) { string res = ""; int i = 0, len; int c1, c2, c3, c4; len = str.Length; len = str.Length; i = 0; res = ""; while (i len) { /* c1 */ do { c1 = base64DecodeChars[Convert.ToByte(str[i++]) & 0xff]; } while (i 1); if (c1 == -1) break; /* c2 */ do { c2 = base64DecodeChars[Convert.ToByte(str[i++]) & 0xff]; } while (i 1); if (c2 == -1) break; res += Convert.ToChar((c1 2) | ((c2 & 0x30) >> 4)); /* c3 */ do { c3 = Convert.ToByte(str[i++]) & 0xff; if (c3 == 61) return res; c3 = base64DecodeChars[c3]; } while (i 1); if (c3 == -1) break; res += Convert.ToChar(((c2 & 0XF) 4) | ((c3 & 0x3C) >> 2)); /* c4 */ do { c4 = Convert.ToByte(str[i++]) & 0xff; if (c4 == 61) return res; c4 = base64DecodeChars[c4]; } while (i 1); if (c4 == -1) break; res += Convert.ToChar(((c3 & 0x03) 6) | c4); } return res; }
c# Base64解密加密
标签:decode 加密 convert name break static ret bre ++
原文地址:https://www.cnblogs.com/yuanzijian-ruiec/p/9734263.html
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