?? aes.pas

?? Aes算法,本例子為加密解密愛好者所提供
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unit Aes;

interface

uses
  Classes, SysUtils;

type
  EAESError = class(Exception);

  PInteger = ^Integer;

  TAESBuffer         = array [0..15] of Byte;
  TAESKey128         = array [0..15] of Byte;
  TAESKey192         = array [0..23] of Byte;
  TAESKey256         = array [0..31] of Byte;
  TAESExpandedKey128 = array [0..43] of Longword;
  TAESExpandedKey192 = array [0..53] of Longword;
  TAESExpandedKey256 = array [0..63] of Longword;

  PAESBuffer         = ^TAESBuffer;
  PAESKey128         = ^TAESKey128;
  PAESKey192         = ^TAESKey192;
  PAESKey256         = ^TAESKey256;
  PAESExpandedKey128 = ^TAESExpandedKey128;
  PAESExpandedKey192 = ^TAESExpandedKey192;
  PAESExpandedKey256 = ^TAESExpandedKey256;

  // Key expansion routines for encryption

procedure ExpandAESKeyForEncryption(const Key: TAESKey128;
  var ExpandedKey: TAESExpandedKey128); overload;
procedure ExpandAESKeyForEncryption(const Key: TAESKey192;
  var ExpandedKey: TAESExpandedKey192); overload;
procedure ExpandAESKeyForEncryption(const Key: TAESKey256;
  var ExpandedKey: TAESExpandedKey256); overload;

  // Block encryption routines

procedure EncryptAES(const InBuf: TAESBuffer; const Key: TAESExpandedKey128;
  var OutBuf: TAESBuffer); overload;
procedure EncryptAES(const InBuf: TAESBuffer; const Key: TAESExpandedKey192;
  var OutBuf: TAESBuffer); overload;
procedure EncryptAES(const InBuf: TAESBuffer; const Key: TAESExpandedKey256;
  var OutBuf: TAESBuffer); overload;

  // Stream encryption routines (ECB mode)

procedure EncryptAESStreamECB(Source: TStream; Count: Cardinal;
  const Key: TAESKey128; Dest: TStream); overload;
procedure EncryptAESStreamECB(Source: TStream; Count: Cardinal;
  const ExpandedKey: TAESExpandedKey128; Dest: TStream); overload;

procedure EncryptAESStreamECB(Source: TStream; Count: Cardinal;
  const Key: TAESKey192; Dest: TStream); overload;
procedure EncryptAESStreamECB(Source: TStream; Count: Cardinal;
  const ExpandedKey: TAESExpandedKey192; Dest: TStream); overload;

procedure EncryptAESStreamECB(Source: TStream; Count: Cardinal;
  const Key: TAESKey256; Dest: TStream); overload;
procedure EncryptAESStreamECB(Source: TStream; Count: Cardinal;
  const ExpandedKey: TAESExpandedKey256; Dest: TStream); overload;

  // Stream encryption routines (CBC mode)

procedure EncryptAESStreamCBC(Source: TStream; Count: Cardinal;
  const Key: TAESKey128; const InitVector: TAESBuffer; Dest: TStream); overload;
procedure EncryptAESStreamCBC(Source: TStream; Count: Cardinal;
  const ExpandedKey: TAESExpandedKey128; const InitVector: TAESBuffer;
  Dest: TStream); overload;

procedure EncryptAESStreamCBC(Source: TStream; Count: Cardinal;
  const Key: TAESKey192; const InitVector: TAESBuffer; Dest: TStream); overload;
procedure EncryptAESStreamCBC(Source: TStream; Count: Cardinal;
  const ExpandedKey: TAESExpandedKey192; const InitVector: TAESBuffer;
  Dest: TStream); overload;

procedure EncryptAESStreamCBC(Source: TStream; Count: Cardinal;
  const Key: TAESKey256; const InitVector: TAESBuffer; Dest: TStream); overload;
procedure EncryptAESStreamCBC(Source: TStream; Count: Cardinal;
  const ExpandedKey: TAESExpandedKey256; const InitVector: TAESBuffer;
  Dest: TStream); overload;

  // Key transformation routines for decryption

procedure ExpandAESKeyForDecryption(var ExpandedKey: TAESExpandedKey128);
  overload;
procedure ExpandAESKeyForDecryption(const Key: TAESKey128;
  var ExpandedKey: TAESExpandedKey128); overload;

procedure ExpandAESKeyForDecryption(var ExpandedKey: TAESExpandedKey192);
  overload;
procedure ExpandAESKeyForDecryption(const Key: TAESKey192;
  var ExpandedKey: TAESExpandedKey192); overload;

procedure ExpandAESKeyForDecryption(var ExpandedKey: TAESExpandedKey256);
  overload;
procedure ExpandAESKeyForDecryption(const Key: TAESKey256;
  var ExpandedKey: TAESExpandedKey256); overload;

  // Block decryption routines

procedure DecryptAES(const InBuf: TAESBuffer; const Key: TAESExpandedKey128;
  var OutBuf: TAESBuffer); overload;
procedure DecryptAES(const InBuf: TAESBuffer; const Key: TAESExpandedKey192;
  var OutBuf: TAESBuffer); overload;
procedure DecryptAES(const InBuf: TAESBuffer; const Key: TAESExpandedKey256;
  var OutBuf: TAESBuffer); overload;

  // Stream decryption routines (ECB mode)

procedure DecryptAESStreamECB(Source: TStream; Count: Cardinal;
  const Key: TAESKey128; Dest: TStream); overload;
procedure DecryptAESStreamECB(Source: TStream; Count: Cardinal;
  const ExpandedKey: TAESExpandedKey128; Dest: TStream); overload;

procedure DecryptAESStreamECB(Source: TStream; Count: Cardinal;
  const Key: TAESKey192; Dest: TStream); overload;
procedure DecryptAESStreamECB(Source: TStream; Count: Cardinal;
  const ExpandedKey: TAESExpandedKey192; Dest: TStream); overload;

procedure DecryptAESStreamECB(Source: TStream; Count: Cardinal;
  const Key: TAESKey256; Dest: TStream); overload;
procedure DecryptAESStreamECB(Source: TStream; Count: Cardinal;
  const ExpandedKey: TAESExpandedKey256; Dest: TStream); overload;

  // Stream decryption routines (CBC mode)

procedure DecryptAESStreamCBC(Source: TStream; Count: Cardinal;
  const Key: TAESKey128; const InitVector: TAESBuffer; Dest: TStream); overload;
procedure DecryptAESStreamCBC(Source: TStream; Count: Cardinal;
  const ExpandedKey: TAESExpandedKey128; const InitVector: TAESBuffer;
  Dest: TStream); overload;

procedure DecryptAESStreamCBC(Source: TStream; Count: Cardinal;
  const Key: TAESKey192; const InitVector: TAESBuffer; Dest: TStream); overload;
procedure DecryptAESStreamCBC(Source: TStream; Count: Cardinal;
  const ExpandedKey: TAESExpandedKey192; const InitVector: TAESBuffer;
  Dest: TStream); overload;

procedure DecryptAESStreamCBC(Source: TStream; Count: Cardinal;
  const Key: TAESKey256; const InitVector: TAESBuffer; Dest: TStream); overload;
procedure DecryptAESStreamCBC(Source: TStream; Count: Cardinal;
  const ExpandedKey: TAESExpandedKey256; const InitVector: TAESBuffer;
  Dest: TStream); overload;
  
function CrcString(Source: string): string;

procedure Encrypt128(Source, Dest: TStream; Key: string);
procedure Encrypt192(Source, Dest: TStream; Key: string);
procedure Encrypt256(Source, Dest: TStream; Key: string);

procedure Decrypt128(Source, Dest: TStream; Key: string);
procedure Decrypt192(Source, Dest: TStream; Key: string);
procedure Decrypt256(Source, Dest: TStream; Key: string);

resourcestring
  SInvalidInBufSize = 'Invalid buffer size for decryption';
  SReadError        = 'Stream read error';
  SWriteError       = 'Stream write error';

implementation

type
  PLongWord = ^LongWord;

function Min(A, B: Integer): Integer;
begin
  if A < B then
    Result := A
  else
    Result := B;
end;

const
  Rcon: array [1..30] of Longword = (
    $00000001, $00000002, $00000004, $00000008, $00000010, $00000020,
    $00000040, $00000080, $0000001B, $00000036, $0000006C, $000000D8,
    $000000AB, $0000004D, $0000009A, $0000002F, $0000005E, $000000BC,
    $00000063, $000000C6, $00000097, $00000035, $0000006A, $000000D4,
    $000000B3, $0000007D, $000000FA, $000000EF, $000000C5, $00000091);

  ForwardTable: array [0..255] of Longword = (
    $A56363C6, $847C7CF8, $997777EE, $8D7B7BF6, $0DF2F2FF, $BD6B6BD6, $B16F6FDE, $54C5C591,
    $50303060, $03010102, $A96767CE, $7D2B2B56, $19FEFEE7, $62D7D7B5, $E6ABAB4D, $9A7676EC,
    $45CACA8F, $9D82821F, $40C9C989, $877D7DFA, $15FAFAEF, $EB5959B2, $C947478E, $0BF0F0FB,
    $ECADAD41, $67D4D4B3, $FDA2A25F, $EAAFAF45, $BF9C9C23, $F7A4A453, $967272E4, $5BC0C09B,
    $C2B7B775, $1CFDFDE1, $AE93933D, $6A26264C, $5A36366C, $413F3F7E, $02F7F7F5, $4FCCCC83,
    $5C343468, $F4A5A551, $34E5E5D1, $08F1F1F9, $937171E2, $73D8D8AB, $53313162, $3F15152A,
    $0C040408, $52C7C795, $65232346, $5EC3C39D, $28181830, $A1969637, $0F05050A, $B59A9A2F,
    $0907070E, $36121224, $9B80801B, $3DE2E2DF, $26EBEBCD, $6927274E, $CDB2B27F, $9F7575EA,
    $1B090912, $9E83831D, $742C2C58, $2E1A1A34, $2D1B1B36, $B26E6EDC, $EE5A5AB4, $FBA0A05B,
    $F65252A4, $4D3B3B76, $61D6D6B7, $CEB3B37D, $7B292952, $3EE3E3DD, $712F2F5E, $97848413,
    $F55353A6, $68D1D1B9, $00000000, $2CEDEDC1, $60202040, $1FFCFCE3, $C8B1B179, $ED5B5BB6,
    $BE6A6AD4, $46CBCB8D, $D9BEBE67, $4B393972, $DE4A4A94, $D44C4C98, $E85858B0, $4ACFCF85,
    $6BD0D0BB, $2AEFEFC5, $E5AAAA4F, $16FBFBED, $C5434386, $D74D4D9A, $55333366, $94858511,
    $CF45458A, $10F9F9E9, $06020204, $817F7FFE, $F05050A0, $443C3C78, $BA9F9F25, $E3A8A84B,
    $F35151A2, $FEA3A35D, $C0404080, $8A8F8F05, $AD92923F, $BC9D9D21, $48383870, $04F5F5F1,
    $DFBCBC63, $C1B6B677, $75DADAAF, $63212142, $30101020, $1AFFFFE5, $0EF3F3FD, $6DD2D2BF,
    $4CCDCD81, $140C0C18, $35131326, $2FECECC3, $E15F5FBE, $A2979735, $CC444488, $3917172E,
    $57C4C493, $F2A7A755, $827E7EFC, $473D3D7A, $AC6464C8, $E75D5DBA, $2B191932, $957373E6,
    $A06060C0, $98818119, $D14F4F9E, $7FDCDCA3, $66222244, $7E2A2A54, $AB90903B, $8388880B,
    $CA46468C, $29EEEEC7, $D3B8B86B, $3C141428, $79DEDEA7, $E25E5EBC, $1D0B0B16, $76DBDBAD,
    $3BE0E0DB, $56323264, $4E3A3A74, $1E0A0A14, $DB494992, $0A06060C, $6C242448, $E45C5CB8,
    $5DC2C29F, $6ED3D3BD, $EFACAC43, $A66262C4, $A8919139, $A4959531, $37E4E4D3, $8B7979F2,
    $32E7E7D5, $43C8C88B, $5937376E, $B76D6DDA, $8C8D8D01, $64D5D5B1, $D24E4E9C, $E0A9A949,
    $B46C6CD8, $FA5656AC, $07F4F4F3, $25EAEACF, $AF6565CA, $8E7A7AF4, $E9AEAE47, $18080810,
    $D5BABA6F, $887878F0, $6F25254A, $722E2E5C, $241C1C38, $F1A6A657, $C7B4B473, $51C6C697,
    $23E8E8CB, $7CDDDDA1, $9C7474E8, $211F1F3E, $DD4B4B96, $DCBDBD61, $868B8B0D, $858A8A0F,
    $907070E0, $423E3E7C, $C4B5B571, $AA6666CC, $D8484890, $05030306, $01F6F6F7, $120E0E1C,
    $A36161C2, $5F35356A, $F95757AE, $D0B9B969, $91868617, $58C1C199, $271D1D3A, $B99E9E27,
    $38E1E1D9, $13F8F8EB, $B398982B, $33111122, $BB6969D2, $70D9D9A9, $898E8E07, $A7949433,
    $B69B9B2D, $221E1E3C, $92878715, $20E9E9C9, $49CECE87, $FF5555AA, $78282850, $7ADFDFA5,
    $8F8C8C03, $F8A1A159, $80898909, $170D0D1A, $DABFBF65, $31E6E6D7, $C6424284, $B86868D0,
    $C3414182, $B0999929, $772D2D5A, $110F0F1E, $CBB0B07B, $FC5454A8, $D6BBBB6D, $3A16162C);

  LastForwardTable: array [0..255] of Longword = (
    $00000063, $0000007C, $00000077, $0000007B, $000000F2, $0000006B, $0000006F, $000000C5,
    $00000030, $00000001, $00000067, $0000002B, $000000FE, $000000D7, $000000AB, $00000076,
    $000000CA, $00000082, $000000C9, $0000007D, $000000FA, $00000059, $00000047, $000000F0,
    $000000AD, $000000D4, $000000A2, $000000AF, $0000009C, $000000A4, $00000072, $000000C0,
    $000000B7, $000000FD, $00000093, $00000026, $00000036, $0000003F, $000000F7, $000000CC,
    $00000034, $000000A5, $000000E5, $000000F1, $00000071, $000000D8, $00000031, $00000015,
    $00000004, $000000C7, $00000023, $000000C3, $00000018, $00000096, $00000005, $0000009A,
    $00000007, $00000012, $00000080, $000000E2, $000000EB, $00000027, $000000B2, $00000075,
    $00000009, $00000083, $0000002C, $0000001A, $0000001B, $0000006E, $0000005A, $000000A0,
    $00000052, $0000003B, $000000D6, $000000B3, $00000029, $000000E3, $0000002F, $00000084,
    $00000053, $000000D1, $00000000, $000000ED, $00000020, $000000FC, $000000B1, $0000005B,
    $0000006A, $000000CB, $000000BE, $00000039, $0000004A, $0000004C, $00000058, $000000CF,
    $000000D0, $000000EF, $000000AA, $000000FB, $00000043, $0000004D, $00000033, $00000085,
    $00000045, $000000F9, $00000002, $0000007F, $00000050, $0000003C, $0000009F, $000000A8,
    $00000051, $000000A3, $00000040, $0000008F, $00000092, $0000009D, $00000038, $000000F5,
    $000000BC, $000000B6, $000000DA, $00000021, $00000010, $000000FF, $000000F3, $000000D2,
    $000000CD, $0000000C, $00000013, $000000EC, $0000005F, $00000097, $00000044, $00000017,
    $000000C4, $000000A7, $0000007E, $0000003D, $00000064, $0000005D, $00000019, $00000073,
    $00000060, $00000081, $0000004F, $000000DC, $00000022, $0000002A, $00000090, $00000088,
    $00000046, $000000EE, $000000B8, $00000014, $000000DE, $0000005E, $0000000B, $000000DB,
    $000000E0, $00000032, $0000003A, $0000000A, $00000049, $00000006, $00000024, $0000005C,
    $000000C2, $000000D3, $000000AC, $00000062, $00000091, $00000095, $000000E4, $00000079,
    $000000E7, $000000C8, $00000037, $0000006D, $0000008D, $000000D5, $0000004E, $000000A9,
    $0000006C, $00000056, $000000F4, $000000EA, $00000065, $0000007A, $000000AE, $00000008,
    $000000BA, $00000078, $00000025, $0000002E, $0000001C, $000000A6, $000000B4, $000000C6,
    $000000E8, $000000DD, $00000074, $0000001F, $0000004B, $000000BD, $0000008B, $0000008A,
    $00000070, $0000003E, $000000B5, $00000066, $00000048, $00000003, $000000F6, $0000000E,
    $00000061, $00000035, $00000057, $000000B9, $00000086, $000000C1, $0000001D, $0000009E,
    $000000E1, $000000F8, $00000098, $00000011, $00000069, $000000D9, $0000008E, $00000094,
    $0000009B, $0000001E, $00000087, $000000E9, $000000CE, $00000055, $00000028, $000000DF,
    $0000008C, $000000A1, $00000089, $0000000D, $000000BF, $000000E6, $00000042, $00000068,
    $00000041, $00000099, $0000002D, $0000000F, $000000B0, $00000054, $000000BB, $00000016);

  InverseTable: array [0..255] of Longword = (
    $50A7F451, $5365417E, $C3A4171A, $965E273A, $CB6BAB3B, $F1459D1F, $AB58FAAC, $9303E34B,
    $55FA3020, $F66D76AD, $9176CC88, $254C02F5, $FCD7E54F, $D7CB2AC5, $80443526, $8FA362B5,
    $495AB1DE, $671BBA25, $980EEA45, $E1C0FE5D, $02752FC3, $12F04C81, $A397468D, $C6F9D36B,
    $E75F8F03, $959C9215, $EB7A6DBF, $DA595295, $2D83BED4, $D3217458, $2969E049, $44C8C98E,
    $6A89C275, $78798EF4, $6B3E5899, $DD71B927, $B64FE1BE, $17AD88F0, $66AC20C9, $B43ACE7D,
    $184ADF63, $82311AE5, $60335197, $457F5362, $E07764B1, $84AE6BBB, $1CA081FE, $942B08F9,
    $58684870, $19FD458F, $876CDE94, $B7F87B52, $23D373AB, $E2024B72, $578F1FE3, $2AAB5566,
    $0728EBB2, $03C2B52F, $9A7BC586, $A50837D3, $F2872830, $B2A5BF23, $BA6A0302, $5C8216ED,
    $2B1CCF8A, $92B479A7, $F0F207F3, $A1E2694E, $CDF4DA65, $D5BE0506, $1F6234D1, $8AFEA6C4,
    $9D532E34, $A055F3A2, $32E18A05, $75EBF6A4, $39EC830B, $AAEF6040, $069F715E, $51106EBD,
    $F98A213E, $3D06DD96, $AE053EDD, $46BDE64D, $B58D5491, $055DC471, $6FD40604, $FF155060,
    $24FB9819, $97E9BDD6, $CC434089, $779ED967, $BD42E8B0, $888B8907, $385B19E7, $DBEEC879,
    $470A7CA1, $E90F427C, $C91E84F8, $00000000, $83868009, $48ED2B32, $AC70111E, $4E725A6C,
    $FBFF0EFD, $5638850F, $1ED5AE3D, $27392D36, $64D90F0A, $21A65C68, $D1545B9B, $3A2E3624,
    $B1670A0C, $0FE75793, $D296EEB4, $9E919B1B, $4FC5C080, $A220DC61, $694B775A, $161A121C,
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