A performant .NET implementation of crypt(3) that leverages Span<T> type in order to hold and transform data.
Requires .NET Core 2.1 / .NET Standard 2.1 or later (Span<T> was introduced in .NET Core 2.1).
Usage:
CryptSharp.Crypt("50", "ROFL"); // returns 50JGnXUgaafgcHere's a repo with two .NET apps, WebAPI and console, that use this code.
Note that Crypt methods have different signatures there.
| using System; | |
| namespace Crypt | |
| { | |
| public static class CryptSharp | |
| { | |
| private const string m_encryptionSaltCharacters = | |
| "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789./"; | |
| private const int m_desIterations = 16; | |
| private static readonly uint[] m_saltTranslation = | |
| { | |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, | |
| 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, | |
| 0x0A, 0x0B, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, | |
| 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, | |
| 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, | |
| 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, | |
| 0x23, 0x24, 0x25, 0x20, 0x21, 0x22, 0x23, 0x24, | |
| 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, | |
| 0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, | |
| 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, | |
| 0x3D, 0x3E, 0x3F, 0x00, 0x00, 0x00, 0x00, 0x00 | |
| }; | |
| private static readonly bool[] m_shifts = | |
| { | |
| false, false, true, true, true, true, true, true, | |
| false, true, true, true, true, true, true, false | |
| }; | |
| private static readonly uint[,] m_skb = | |
| { | |
| { | |
| 0x00000000, 0x00000010, 0x20000000, 0x20000010, | |
| 0x00010000, 0x00010010, 0x20010000, 0x20010010, | |
| 0x00000800, 0x00000810, 0x20000800, 0x20000810, | |
| 0x00010800, 0x00010810, 0x20010800, 0x20010810, | |
| 0x00000020, 0x00000030, 0x20000020, 0x20000030, | |
| 0x00010020, 0x00010030, 0x20010020, 0x20010030, | |
| 0x00000820, 0x00000830, 0x20000820, 0x20000830, | |
| 0x00010820, 0x00010830, 0x20010820, 0x20010830, | |
| 0x00080000, 0x00080010, 0x20080000, 0x20080010, | |
| 0x00090000, 0x00090010, 0x20090000, 0x20090010, | |
| 0x00080800, 0x00080810, 0x20080800, 0x20080810, | |
| 0x00090800, 0x00090810, 0x20090800, 0x20090810, | |
| 0x00080020, 0x00080030, 0x20080020, 0x20080030, | |
| 0x00090020, 0x00090030, 0x20090020, 0x20090030, | |
| 0x00080820, 0x00080830, 0x20080820, 0x20080830, | |
| 0x00090820, 0x00090830, 0x20090820, 0x20090830 | |
| }, | |
| { | |
| 0x00000000, 0x02000000, 0x00002000, 0x02002000, | |
| 0x00200000, 0x02200000, 0x00202000, 0x02202000, | |
| 0x00000004, 0x02000004, 0x00002004, 0x02002004, | |
| 0x00200004, 0x02200004, 0x00202004, 0x02202004, | |
| 0x00000400, 0x02000400, 0x00002400, 0x02002400, | |
| 0x00200400, 0x02200400, 0x00202400, 0x02202400, | |
| 0x00000404, 0x02000404, 0x00002404, 0x02002404, | |
| 0x00200404, 0x02200404, 0x00202404, 0x02202404, | |
| 0x10000000, 0x12000000, 0x10002000, 0x12002000, | |
| 0x10200000, 0x12200000, 0x10202000, 0x12202000, | |
| 0x10000004, 0x12000004, 0x10002004, 0x12002004, | |
| 0x10200004, 0x12200004, 0x10202004, 0x12202004, | |
| 0x10000400, 0x12000400, 0x10002400, 0x12002400, | |
| 0x10200400, 0x12200400, 0x10202400, 0x12202400, | |
| 0x10000404, 0x12000404, 0x10002404, 0x12002404, | |
| 0x10200404, 0x12200404, 0x10202404, 0x12202404 | |
| }, | |
| { | |
| 0x00000000, 0x00000001, 0x00040000, 0x00040001, | |
| 0x01000000, 0x01000001, 0x01040000, 0x01040001, | |
| 0x00000002, 0x00000003, 0x00040002, 0x00040003, | |
| 0x01000002, 0x01000003, 0x01040002, 0x01040003, | |
| 0x00000200, 0x00000201, 0x00040200, 0x00040201, | |
| 0x01000200, 0x01000201, 0x01040200, 0x01040201, | |
| 0x00000202, 0x00000203, 0x00040202, 0x00040203, | |
| 0x01000202, 0x01000203, 0x01040202, 0x01040203, | |
| 0x08000000, 0x08000001, 0x08040000, 0x08040001, | |
| 0x09000000, 0x09000001, 0x09040000, 0x09040001, | |
| 0x08000002, 0x08000003, 0x08040002, 0x08040003, | |
| 0x09000002, 0x09000003, 0x09040002, 0x09040003, | |
| 0x08000200, 0x08000201, 0x08040200, 0x08040201, | |
| 0x09000200, 0x09000201, 0x09040200, 0x09040201, | |
| 0x08000202, 0x08000203, 0x08040202, 0x08040203, | |
| 0x09000202, 0x09000203, 0x09040202, 0x09040203 | |
| }, | |
| { | |
| 0x00000000, 0x00100000, 0x00000100, 0x00100100, | |
| 0x00000008, 0x00100008, 0x00000108, 0x00100108, | |
| 0x00001000, 0x00101000, 0x00001100, 0x00101100, | |
| 0x00001008, 0x00101008, 0x00001108, 0x00101108, | |
| 0x04000000, 0x04100000, 0x04000100, 0x04100100, | |
| 0x04000008, 0x04100008, 0x04000108, 0x04100108, | |
| 0x04001000, 0x04101000, 0x04001100, 0x04101100, | |
| 0x04001008, 0x04101008, 0x04001108, 0x04101108, | |
| 0x00020000, 0x00120000, 0x00020100, 0x00120100, | |
| 0x00020008, 0x00120008, 0x00020108, 0x00120108, | |
| 0x00021000, 0x00121000, 0x00021100, 0x00121100, | |
| 0x00021008, 0x00121008, 0x00021108, 0x00121108, | |
| 0x04020000, 0x04120000, 0x04020100, 0x04120100, | |
| 0x04020008, 0x04120008, 0x04020108, 0x04120108, | |
| 0x04021000, 0x04121000, 0x04021100, 0x04121100, | |
| 0x04021008, 0x04121008, 0x04021108, 0x04121108 | |
| }, | |
| { | |
| 0x00000000, 0x10000000, 0x00010000, 0x10010000, | |
| 0x00000004, 0x10000004, 0x00010004, 0x10010004, | |
| 0x20000000, 0x30000000, 0x20010000, 0x30010000, | |
| 0x20000004, 0x30000004, 0x20010004, 0x30010004, | |
| 0x00100000, 0x10100000, 0x00110000, 0x10110000, | |
| 0x00100004, 0x10100004, 0x00110004, 0x10110004, | |
| 0x20100000, 0x30100000, 0x20110000, 0x30110000, | |
| 0x20100004, 0x30100004, 0x20110004, 0x30110004, | |
| 0x00001000, 0x10001000, 0x00011000, 0x10011000, | |
| 0x00001004, 0x10001004, 0x00011004, 0x10011004, | |
| 0x20001000, 0x30001000, 0x20011000, 0x30011000, | |
| 0x20001004, 0x30001004, 0x20011004, 0x30011004, | |
| 0x00101000, 0x10101000, 0x00111000, 0x10111000, | |
| 0x00101004, 0x10101004, 0x00111004, 0x10111004, | |
| 0x20101000, 0x30101000, 0x20111000, 0x30111000, | |
| 0x20101004, 0x30101004, 0x20111004, 0x30111004 | |
| }, | |
| { | |
| 0x00000000, 0x08000000, 0x00000008, 0x08000008, | |
| 0x00000400, 0x08000400, 0x00000408, 0x08000408, | |
| 0x00020000, 0x08020000, 0x00020008, 0x08020008, | |
| 0x00020400, 0x08020400, 0x00020408, 0x08020408, | |
| 0x00000001, 0x08000001, 0x00000009, 0x08000009, | |
| 0x00000401, 0x08000401, 0x00000409, 0x08000409, | |
| 0x00020001, 0x08020001, 0x00020009, 0x08020009, | |
| 0x00020401, 0x08020401, 0x00020409, 0x08020409, | |
| 0x02000000, 0x0A000000, 0x02000008, 0x0A000008, | |
| 0x02000400, 0x0A000400, 0x02000408, 0x0A000408, | |
| 0x02020000, 0x0A020000, 0x02020008, 0x0A020008, | |
| 0x02020400, 0x0A020400, 0x02020408, 0x0A020408, | |
| 0x02000001, 0x0A000001, 0x02000009, 0x0A000009, | |
| 0x02000401, 0x0A000401, 0x02000409, 0x0A000409, | |
| 0x02020001, 0x0A020001, 0x02020009, 0x0A020009, | |
| 0x02020401, 0x0A020401, 0x02020409, 0x0A020409 | |
| }, | |
| { | |
| 0x00000000, 0x00000100, 0x00080000, 0x00080100, | |
| 0x01000000, 0x01000100, 0x01080000, 0x01080100, | |
| 0x00000010, 0x00000110, 0x00080010, 0x00080110, | |
| 0x01000010, 0x01000110, 0x01080010, 0x01080110, | |
| 0x00200000, 0x00200100, 0x00280000, 0x00280100, | |
| 0x01200000, 0x01200100, 0x01280000, 0x01280100, | |
| 0x00200010, 0x00200110, 0x00280010, 0x00280110, | |
| 0x01200010, 0x01200110, 0x01280010, 0x01280110, | |
| 0x00000200, 0x00000300, 0x00080200, 0x00080300, | |
| 0x01000200, 0x01000300, 0x01080200, 0x01080300, | |
| 0x00000210, 0x00000310, 0x00080210, 0x00080310, | |
| 0x01000210, 0x01000310, 0x01080210, 0x01080310, | |
| 0x00200200, 0x00200300, 0x00280200, 0x00280300, | |
| 0x01200200, 0x01200300, 0x01280200, 0x01280300, | |
| 0x00200210, 0x00200310, 0x00280210, 0x00280310, | |
| 0x01200210, 0x01200310, 0x01280210, 0x01280310 | |
| }, | |
| { | |
| 0x00000000, 0x04000000, 0x00040000, 0x04040000, | |
| 0x00000002, 0x04000002, 0x00040002, 0x04040002, | |
| 0x00002000, 0x04002000, 0x00042000, 0x04042000, | |
| 0x00002002, 0x04002002, 0x00042002, 0x04042002, | |
| 0x00000020, 0x04000020, 0x00040020, 0x04040020, | |
| 0x00000022, 0x04000022, 0x00040022, 0x04040022, | |
| 0x00002020, 0x04002020, 0x00042020, 0x04042020, | |
| 0x00002022, 0x04002022, 0x00042022, 0x04042022, | |
| 0x00000800, 0x04000800, 0x00040800, 0x04040800, | |
| 0x00000802, 0x04000802, 0x00040802, 0x04040802, | |
| 0x00002800, 0x04002800, 0x00042800, 0x04042800, | |
| 0x00002802, 0x04002802, 0x00042802, 0x04042802, | |
| 0x00000820, 0x04000820, 0x00040820, 0x04040820, | |
| 0x00000822, 0x04000822, 0x00040822, 0x04040822, | |
| 0x00002820, 0x04002820, 0x00042820, 0x04042820, | |
| 0x00002822, 0x04002822, 0x00042822, 0x04042822 | |
| } | |
| }; | |
| private static readonly uint[,] m_SPTranslationTable = | |
| { | |
| { | |
| 0x00820200, 0x00020000, 0x80800000, 0x80820200, | |
| 0x00800000, 0x80020200, 0x80020000, 0x80800000, | |
| 0x80020200, 0x00820200, 0x00820000, 0x80000200, | |
| 0x80800200, 0x00800000, 0x00000000, 0x80020000, | |
| 0x00020000, 0x80000000, 0x00800200, 0x00020200, | |
| 0x80820200, 0x00820000, 0x80000200, 0x00800200, | |
| 0x80000000, 0x00000200, 0x00020200, 0x80820000, | |
| 0x00000200, 0x80800200, 0x80820000, 0x00000000, | |
| 0x00000000, 0x80820200, 0x00800200, 0x80020000, | |
| 0x00820200, 0x00020000, 0x80000200, 0x00800200, | |
| 0x80820000, 0x00000200, 0x00020200, 0x80800000, | |
| 0x80020200, 0x80000000, 0x80800000, 0x00820000, | |
| 0x80820200, 0x00020200, 0x00820000, 0x80800200, | |
| 0x00800000, 0x80000200, 0x80020000, 0x00000000, | |
| 0x00020000, 0x00800000, 0x80800200, 0x00820200, | |
| 0x80000000, 0x80820000, 0x00000200, 0x80020200 | |
| }, | |
| { | |
| 0x10042004, 0x00000000, 0x00042000, 0x10040000, | |
| 0x10000004, 0x00002004, 0x10002000, 0x00042000, | |
| 0x00002000, 0x10040004, 0x00000004, 0x10002000, | |
| 0x00040004, 0x10042000, 0x10040000, 0x00000004, | |
| 0x00040000, 0x10002004, 0x10040004, 0x00002000, | |
| 0x00042004, 0x10000000, 0x00000000, 0x00040004, | |
| 0x10002004, 0x00042004, 0x10042000, 0x10000004, | |
| 0x10000000, 0x00040000, 0x00002004, 0x10042004, | |
| 0x00040004, 0x10042000, 0x10002000, 0x00042004, | |
| 0x10042004, 0x00040004, 0x10000004, 0x00000000, | |
| 0x10000000, 0x00002004, 0x00040000, 0x10040004, | |
| 0x00002000, 0x10000000, 0x00042004, 0x10002004, | |
| 0x10042000, 0x00002000, 0x00000000, 0x10000004, | |
| 0x00000004, 0x10042004, 0x00042000, 0x10040000, | |
| 0x10040004, 0x00040000, 0x00002004, 0x10002000, | |
| 0x10002004, 0x00000004, 0x10040000, 0x00042000 | |
| }, | |
| { | |
| 0x41000000, 0x01010040, 0x00000040, 0x41000040, | |
| 0x40010000, 0x01000000, 0x41000040, 0x00010040, | |
| 0x01000040, 0x00010000, 0x01010000, 0x40000000, | |
| 0x41010040, 0x40000040, 0x40000000, 0x41010000, | |
| 0x00000000, 0x40010000, 0x01010040, 0x00000040, | |
| 0x40000040, 0x41010040, 0x00010000, 0x41000000, | |
| 0x41010000, 0x01000040, 0x40010040, 0x01010000, | |
| 0x00010040, 0x00000000, 0x01000000, 0x40010040, | |
| 0x01010040, 0x00000040, 0x40000000, 0x00010000, | |
| 0x40000040, 0x40010000, 0x01010000, 0x41000040, | |
| 0x00000000, 0x01010040, 0x00010040, 0x41010000, | |
| 0x40010000, 0x01000000, 0x41010040, 0x40000000, | |
| 0x40010040, 0x41000000, 0x01000000, 0x41010040, | |
| 0x00010000, 0x01000040, 0x41000040, 0x00010040, | |
| 0x01000040, 0x00000000, 0x41010000, 0x40000040, | |
| 0x41000000, 0x40010040, 0x00000040, 0x01010000 | |
| }, | |
| { | |
| 0x00100402, 0x04000400, 0x00000002, 0x04100402, | |
| 0x00000000, 0x04100000, 0x04000402, 0x00100002, | |
| 0x04100400, 0x04000002, 0x04000000, 0x00000402, | |
| 0x04000002, 0x00100402, 0x00100000, 0x04000000, | |
| 0x04100002, 0x00100400, 0x00000400, 0x00000002, | |
| 0x00100400, 0x04000402, 0x04100000, 0x00000400, | |
| 0x00000402, 0x00000000, 0x00100002, 0x04100400, | |
| 0x04000400, 0x04100002, 0x04100402, 0x00100000, | |
| 0x04100002, 0x00000402, 0x00100000, 0x04000002, | |
| 0x00100400, 0x04000400, 0x00000002, 0x04100000, | |
| 0x04000402, 0x00000000, 0x00000400, 0x00100002, | |
| 0x00000000, 0x04100002, 0x04100400, 0x00000400, | |
| 0x04000000, 0x04100402, 0x00100402, 0x00100000, | |
| 0x04100402, 0x00000002, 0x04000400, 0x00100402, | |
| 0x00100002, 0x00100400, 0x04100000, 0x04000402, | |
| 0x00000402, 0x04000000, 0x04000002, 0x04100400 | |
| }, | |
| { | |
| 0x02000000, 0x00004000, 0x00000100, 0x02004108, | |
| 0x02004008, 0x02000100, 0x00004108, 0x02004000, | |
| 0x00004000, 0x00000008, 0x02000008, 0x00004100, | |
| 0x02000108, 0x02004008, 0x02004100, 0x00000000, | |
| 0x00004100, 0x02000000, 0x00004008, 0x00000108, | |
| 0x02000100, 0x00004108, 0x00000000, 0x02000008, | |
| 0x00000008, 0x02000108, 0x02004108, 0x00004008, | |
| 0x02004000, 0x00000100, 0x00000108, 0x02004100, | |
| 0x02004100, 0x02000108, 0x00004008, 0x02004000, | |
| 0x00004000, 0x00000008, 0x02000008, 0x02000100, | |
| 0x02000000, 0x00004100, 0x02004108, 0x00000000, | |
| 0x00004108, 0x02000000, 0x00000100, 0x00004008, | |
| 0x02000108, 0x00000100, 0x00000000, 0x02004108, | |
| 0x02004008, 0x02004100, 0x00000108, 0x00004000, | |
| 0x00004100, 0x02004008, 0x02000100, 0x00000108, | |
| 0x00000008, 0x00004108, 0x02004000, 0x02000008 | |
| }, | |
| { | |
| 0x20000010, 0x00080010, 0x00000000, 0x20080800, | |
| 0x00080010, 0x00000800, 0x20000810, 0x00080000, | |
| 0x00000810, 0x20080810, 0x00080800, 0x20000000, | |
| 0x20000800, 0x20000010, 0x20080000, 0x00080810, | |
| 0x00080000, 0x20000810, 0x20080010, 0x00000000, | |
| 0x00000800, 0x00000010, 0x20080800, 0x20080010, | |
| 0x20080810, 0x20080000, 0x20000000, 0x00000810, | |
| 0x00000010, 0x00080800, 0x00080810, 0x20000800, | |
| 0x00000810, 0x20000000, 0x20000800, 0x00080810, | |
| 0x20080800, 0x00080010, 0x00000000, 0x20000800, | |
| 0x20000000, 0x00000800, 0x20080010, 0x00080000, | |
| 0x00080010, 0x20080810, 0x00080800, 0x00000010, | |
| 0x20080810, 0x00080800, 0x00080000, 0x20000810, | |
| 0x20000010, 0x20080000, 0x00080810, 0x00000000, | |
| 0x00000800, 0x20000010, 0x20000810, 0x20080800, | |
| 0x20080000, 0x00000810, 0x00000010, 0x20080010 | |
| }, | |
| { | |
| 0x00001000, 0x00000080, 0x00400080, 0x00400001, | |
| 0x00401081, 0x00001001, 0x00001080, 0x00000000, | |
| 0x00400000, 0x00400081, 0x00000081, 0x00401000, | |
| 0x00000001, 0x00401080, 0x00401000, 0x00000081, | |
| 0x00400081, 0x00001000, 0x00001001, 0x00401081, | |
| 0x00000000, 0x00400080, 0x00400001, 0x00001080, | |
| 0x00401001, 0x00001081, 0x00401080, 0x00000001, | |
| 0x00001081, 0x00401001, 0x00000080, 0x00400000, | |
| 0x00001081, 0x00401000, 0x00401001, 0x00000081, | |
| 0x00001000, 0x00000080, 0x00400000, 0x00401001, | |
| 0x00400081, 0x00001081, 0x00001080, 0x00000000, | |
| 0x00000080, 0x00400001, 0x00000001, 0x00400080, | |
| 0x00000000, 0x00400081, 0x00400080, 0x00001080, | |
| 0x00000081, 0x00001000, 0x00401081, 0x00400000, | |
| 0x00401080, 0x00000001, 0x00001001, 0x00401081, | |
| 0x00400001, 0x00401080, 0x00401000, 0x00001001 | |
| }, | |
| { | |
| 0x08200020, 0x08208000, 0x00008020, 0x00000000, | |
| 0x08008000, 0x00200020, 0x08200000, 0x08208020, | |
| 0x00000020, 0x08000000, 0x00208000, 0x00008020, | |
| 0x00208020, 0x08008020, 0x08000020, 0x08200000, | |
| 0x00008000, 0x00208020, 0x00200020, 0x08008000, | |
| 0x08208020, 0x08000020, 0x00000000, 0x00208000, | |
| 0x08000000, 0x00200000, 0x08008020, 0x08200020, | |
| 0x00200000, 0x00008000, 0x08208000, 0x00000020, | |
| 0x00200000, 0x00008000, 0x08000020, 0x08208020, | |
| 0x00008020, 0x08000000, 0x00000000, 0x00208000, | |
| 0x08200020, 0x08008020, 0x08008000, 0x00200020, | |
| 0x08208000, 0x00000020, 0x00200020, 0x08008000, | |
| 0x08208020, 0x00200000, 0x08200000, 0x08000020, | |
| 0x00208000, 0x00008020, 0x08008020, 0x08200000, | |
| 0x00000020, 0x08208000, 0x00208020, 0x00000000, | |
| 0x08000000, 0x08200020, 0x00008000, 0x00208020 | |
| } | |
| }; | |
| private static readonly uint[] m_characterConversionTable = | |
| { | |
| 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, | |
| 0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44, | |
| 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, | |
| 0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54, | |
| 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62, | |
| 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, | |
| 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, | |
| 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A | |
| }; | |
| private static readonly Random _random = new Random(); | |
| public static string Crypt(ReadOnlySpan<char> textToEncrypt) | |
| { | |
| int maxGeneratedNumber = m_encryptionSaltCharacters.Length; | |
| int randomIndex; | |
| Span<char> encryptionSalt = stackalloc char[2]; | |
| for (int index = 0; index < 2; index++) | |
| { | |
| randomIndex = _random.Next(maxGeneratedNumber); | |
| encryptionSalt[index] = m_encryptionSaltCharacters[randomIndex]; | |
| } | |
| return Crypt(encryptionSalt, textToEncrypt); | |
| } | |
| public static string Crypt(ReadOnlySpan<char> encryptionSalt, ReadOnlySpan<char> textToEncrypt) | |
| { | |
| if (encryptionSalt.Length != 2) | |
| throw new ArgumentException("Encryption salt must be 2 characters long.", nameof(encryptionSalt)); | |
| Span<byte> encryptionKey = stackalloc byte[8]; | |
| for (int index = 0; index < encryptionKey.Length && index < textToEncrypt.Length; index++) | |
| encryptionKey[index] = (byte)(Convert.ToInt32(textToEncrypt[index]) << 1); | |
| Span<uint> schedule = stackalloc uint[m_desIterations * 2]; | |
| SetDESKey(encryptionKey, schedule); | |
| uint firstSaltTranslator = m_saltTranslation[Convert.ToUInt32(encryptionSalt[0])]; | |
| uint secondSaltTranslator = m_saltTranslation[Convert.ToUInt32(encryptionSalt[1])] << 4; | |
| Span<uint> singleOutputKey = stackalloc uint[2]; | |
| Body(schedule, firstSaltTranslator, secondSaltTranslator, singleOutputKey); | |
| Span<byte> binaryBuffer = stackalloc byte[9]; | |
| IntToFourBytes(singleOutputKey[0], binaryBuffer, 0); | |
| IntToFourBytes(singleOutputKey[1], binaryBuffer, 4); | |
| binaryBuffer[8] = 0; | |
| int binaryBufferIndex = 0; | |
| uint bitChecker = 0x80; | |
| Span<char> encryptionBuffer = stackalloc char[13]; | |
| encryptionBuffer[0] = encryptionSalt[0]; | |
| encryptionBuffer[1] = encryptionSalt[1]; | |
| for (int index = 2; index < 13; index++) | |
| { | |
| uint passwordCharacter = 0; | |
| for (int secondIndex = 0; secondIndex < 6; secondIndex++) | |
| { | |
| passwordCharacter <<= 1; | |
| if ((binaryBuffer[binaryBufferIndex] & bitChecker) != 0) | |
| passwordCharacter |= 1; | |
| bitChecker >>= 1; | |
| if (bitChecker == 0) | |
| { | |
| binaryBufferIndex++; | |
| bitChecker = 0x80; | |
| } | |
| } | |
| encryptionBuffer[index] = Convert.ToChar(m_characterConversionTable[passwordCharacter]); | |
| } | |
| return encryptionBuffer.ToString(); | |
| } | |
| private static void SetDESKey(Span<byte> encryptionKey, Span<uint> schedule) | |
| { | |
| uint firstInt = FourBytesToInt(encryptionKey, 0); | |
| uint secondInt = FourBytesToInt(encryptionKey, 4); | |
| Span<uint> operationResults = stackalloc uint[2]; | |
| PermOperation(secondInt, firstInt, 4, 0x0F0F0F0F, operationResults); | |
| firstInt = HPermOperation(operationResults[1], -2, 0xCCCC0000); | |
| secondInt = HPermOperation(operationResults[0], -2, 0xCCCC0000); | |
| PermOperation(secondInt, firstInt, 1, 0x55555555, operationResults); | |
| secondInt = operationResults[0]; | |
| firstInt = operationResults[1]; | |
| PermOperation(firstInt, secondInt, 8, 0x00FF00FF, operationResults); | |
| firstInt = operationResults[0]; | |
| secondInt = operationResults[1]; | |
| PermOperation(secondInt, firstInt, 1, 0x55555555, operationResults); | |
| firstInt = operationResults[1] & 0x0FFFFFFF; | |
| secondInt = (((operationResults[0] & 0xFF) << 16) | (operationResults[0] & 0xFF00) | | |
| ((operationResults[0] & 0xFF0000) >> 16) | ((operationResults[1] & 0xF0000000) >> 4)); | |
| int scheduleIndex = 0; | |
| for (int index = 0; index < m_desIterations; index++) | |
| { | |
| if (m_shifts[index]) | |
| { | |
| firstInt = (firstInt >> 2) | (firstInt << 26); | |
| secondInt = (secondInt >> 2) | (secondInt << 26); | |
| } | |
| else | |
| { | |
| firstInt = (firstInt >> 1) | (firstInt << 27); | |
| secondInt = (secondInt >> 1) | (secondInt << 27); | |
| } | |
| firstInt &= 0x0FFFFFFF; | |
| secondInt &= 0xFFFFFFF; | |
| uint firstSkbValue = m_skb[0, firstInt & 0x3F] | | |
| m_skb[1, ((firstInt >> 6) & 0x03) | ((firstInt >> 7) & 0x3C)] | | |
| m_skb[2, ((firstInt >> 13) & 0x0F) | ((firstInt >> 14) & 0x30)] | | |
| m_skb[3, ((firstInt >> 20) & 0x01) | ((firstInt >> 21) & 0x06) | ((firstInt >> 22) & 0x38)]; | |
| uint secondSkbValue = m_skb[4, secondInt & 0x3F] | | |
| m_skb[5, ((secondInt >> 7) & 0x03) | ((secondInt >> 8) & 0x3C)] | | |
| m_skb[6, (secondInt >> 15) & 0x3F] | | |
| m_skb[7, ((secondInt >> 21) & 0x0F) | ((secondInt >> 22) & 0x30)]; | |
| schedule[scheduleIndex++] = ((secondSkbValue << 16) | (firstSkbValue & 0xFFFF)) & 0xFFFFFFFF; | |
| firstSkbValue = ((firstSkbValue >> 16) | (secondSkbValue & 0xFFFF0000)); | |
| firstSkbValue = (firstSkbValue << 4) | (firstSkbValue >> 28); | |
| schedule[scheduleIndex++] = firstSkbValue & 0xFFFFFFFF; | |
| } | |
| } | |
| private static void Body(Span<uint> schedule, uint firstSaltTranslator, uint secondSaltTranslator, Span<uint> singleOutputKey) | |
| { | |
| uint left = 0; | |
| uint right = 0; | |
| uint tempInt; | |
| for (int index = 0; index < 25; index++) | |
| { | |
| for (int secondIndex = 0; secondIndex < m_desIterations * 2; secondIndex += 4) | |
| { | |
| left = DEncrypt(left, right, secondIndex, firstSaltTranslator, secondSaltTranslator, schedule); | |
| right = DEncrypt(right, left, secondIndex + 2, firstSaltTranslator, secondSaltTranslator, schedule); | |
| } | |
| tempInt = left; | |
| left = right; | |
| right = tempInt; | |
| } | |
| tempInt = right; | |
| right = ((left >> 1) | (left << 31)) & 0xFFFFFFFF; | |
| left = ((tempInt >> 1) | (tempInt << 31)) & 0xFFFFFFFF; | |
| Span<uint> operationResults = stackalloc uint[2]; | |
| PermOperation(right, left, 1, 0x55555555, operationResults); | |
| right = operationResults[0]; | |
| left = operationResults[1]; | |
| PermOperation(left, right, 8, 0x00FF00FF, operationResults); | |
| left = operationResults[0]; | |
| right = operationResults[1]; | |
| PermOperation(right, left, 2, 0x33333333, operationResults); | |
| right = operationResults[0]; | |
| left = operationResults[1]; | |
| PermOperation(left, right, 16, 0xFFFF, operationResults); | |
| left = operationResults[0]; | |
| right = operationResults[1]; | |
| PermOperation(right, left, 4, 0x0F0F0F0F, operationResults); | |
| singleOutputKey[0] = operationResults[1]; | |
| singleOutputKey[1] = operationResults[0]; | |
| } | |
| private static uint DEncrypt(uint left, uint right, int scheduleIndex, uint firstSaltTranslator, uint secondSaltTranslator, Span<uint> schedule) | |
| { | |
| uint thirdInt = right ^ (right >> 16); | |
| uint secondInt = thirdInt & firstSaltTranslator; | |
| thirdInt = thirdInt & secondSaltTranslator; | |
| secondInt = (secondInt ^ (secondInt << 16)) ^ right ^ schedule[scheduleIndex]; | |
| uint firstInt = (thirdInt ^ (thirdInt << 16)) ^ right ^ schedule[scheduleIndex + 1]; | |
| firstInt = (firstInt >> 4) | (firstInt << 28); | |
| left ^= (m_SPTranslationTable[1, firstInt & 0x3F] | | |
| m_SPTranslationTable[3, (firstInt >> 8) & 0x3F] | | |
| m_SPTranslationTable[5, (firstInt >> 16) & 0x3F] | | |
| m_SPTranslationTable[7, (firstInt >> 24) & 0x3F] | | |
| m_SPTranslationTable[0, secondInt & 0x3F] | | |
| m_SPTranslationTable[2, (secondInt >> 8) & 0x3F] | | |
| m_SPTranslationTable[4, (secondInt >> 16) & 0x3F] | | |
| m_SPTranslationTable[6, (secondInt >> 24) & 0x3F]); | |
| return left; | |
| } | |
| private static uint FourBytesToInt(Span<byte> inputBytes, int offset) | |
| { | |
| int resultValue; | |
| resultValue = (inputBytes[offset++] & 0xFF); | |
| resultValue |= (inputBytes[offset++] & 0xFF) << 8; | |
| resultValue |= (inputBytes[offset++] & 0xFF) << 16; | |
| resultValue |= (inputBytes[offset] & 0xFF) << 24; | |
| return (uint)resultValue; | |
| } | |
| private static void IntToFourBytes(uint inputInt, Span<byte> outputBytes, int offset) | |
| { | |
| outputBytes[offset++] = (byte)(inputInt & 0xFF); | |
| outputBytes[offset++] = (byte)((inputInt >> 8) & 0xFF); | |
| outputBytes[offset++] = (byte)((inputInt >> 16) & 0xFF); | |
| outputBytes[offset] = (byte)((inputInt >> 24) & 0xFF); | |
| } | |
| private static void PermOperation(uint firstInt, uint secondInt, uint thirdInt, uint fourthInt, Span<uint> operationResults) | |
| { | |
| uint tempInt = ((firstInt >> (int)thirdInt) ^ secondInt) & fourthInt; | |
| firstInt ^= tempInt << (int)thirdInt; | |
| secondInt ^= tempInt; | |
| operationResults[0] = firstInt; | |
| operationResults[1] = secondInt; | |
| } | |
| private static uint HPermOperation(uint firstInt, int secondInt, uint thirdInt) | |
| { | |
| uint tempInt = ((firstInt << (16 - secondInt)) ^ firstInt) & thirdInt; | |
| return firstInt ^ tempInt ^ (tempInt >> (16 - secondInt)); | |
| } | |
| } | |
| } |