最近做一个接口，与JAVA的关于DES/CBC/PKCS5Padding 互相解密。在网上找了很多资料，摸索了3天才摸索出来。同样的明文，用JAVA加密的密文死活都跟用DELPHI加密的不相等，有时候少于8个字符的就正常，多了8个字符的就有问题，原来是有个7把7改成8就可以了。害人啊，，
function EncryDes(const str:string;const keystr:string;const ivstr:string):string ;
var key:tkey64;
Context:TDESContext;
Block,iv:TDESBlock;
i,j,len,posnum:smallint;
poschar,xx:char;
xuhuan:integer;
begin
for i:=0 to 7 do begin
if i > (length(keystr)-1) then
key[i] :=0
else
key[i] := byte(keystr[i+1]);
end;
for i:=0 to 7 do begin
if i > (length(ivstr)-1) then
iv[i]:=0
else
iv[i] := byte(ivstr[i+1]);
end;
InitEncryptDES(Key, Context, true);
len := length(AnsiString(str));
xx:= char( 8- (len mod 8));
if len<=8 then
xuhuan:=0
else
xuhuan:=round(len/8);
for i:=0 to xuhuan do
begin
for j:=0 to 7 do
begin
if ((i*8+j+1)<=len) then //关键这一步，网上好多参考资料都是((i*7+j+1)<=len)，而不是((i*8+j+1)<=len) 害人啊，害得我摸索了3天，，哎
begin
poschar:=str[i*8+j+1];
block[j]:=byte(poschar);
end
else
block[j]:=byte(xx);
end;
EncryptDESCBC(Context, IV, Block);
for j:= 0 to 7 do begin
posnum:=block[j];
result := result + inttohex(posnum,2);
end;
iv:=block;
end;
end;
//完整代码如下
unit dmdes;
{*********************************************************}
{* DELPHI、PHP、C#通用DES编码解码单元 *}
{* 由TurboPower LockBox部分代码改写 *}
{* 滕州市东鸣软件工作室制作 ZWF 2011-12-27 *}
{*********************************************************}
{EncryDes为编码函数，DecryDes为解码函数，keystr为密码，ivstr为偏移量，
一般设置keystr，ivstr相同，内容为八位字节长度的字符串,编码结果为十六进制字串}
interface
uses
Windows,SysUtils;
type
PKey64 = ^TKey64;
TKey64 = array [0..7] of Byte;
type
TDESBlock = array[0..7] of Byte;
TDESContext = packed record
TransformedKey : array [0..31] of LongInt;
Encrypt : Boolean;
end;
function EncryDes(const str:string;const keystr:string;const ivstr:string):string ;
function DecryDes(const str:string;const keystr:string;const ivstr:string):string ;
function DecryDessec(const str:string;const keystr:string;const ivstr:string):string ;
implementation
procedure XorMemPrim(var Mem1; const Mem2; Count : Cardinal); register;
asm
push esi
push edi
mov esi, eax //esi = Mem1
mov edi, edx //edi = Mem2
push ecx //save byte count
shr ecx, 2 //convert to dwords
jz @Continue
cld
@Loop1: //xor dwords at a time
mov eax, [edi]
xor [esi], eax
add esi, 4
add edi, 4
dec ecx
jnz @Loop1
@Continue: //handle remaining bytes (3 or less)
pop ecx
and ecx, 3
jz @Done
@Loop2: //xor remaining bytes
mov al, [edi]
xor [esi], al
inc esi
inc edi
dec ecx
jnz @Loop2
@Done:
pop edi
pop esi
end;
{ -------------------------------------------------------------------------- }
procedure XorMem(var Mem1; const Mem2; Count : Cardinal);
begin
XorMemPrim(Mem1, Mem2, Count);
end;
{ -------------------------------------------------------------------------- }
procedure EncryptDES(const Context : TDESContext; var Block : TDESBlock);
const
SPBox : array [0..7, 0..63] of DWord =
(($01010400, $00000000, $00010000, $01010404, $01010004, $00010404, $00000004, $00010000,
$00000400, $01010400, $01010404, $00000400, $01000404, $01010004, $01000000, $00000004,
$00000404, $01000400, $01000400, $00010400, $00010400, $01010000, $01010000, $01000404,
$00010004, $01000004, $01000004, $00010004, $00000000, $00000404, $00010404, $01000000,
$00010000, $01010404, $00000004, $01010000, $01010400, $01000000, $01000000, $00000400,
$01010004, $00010000, $00010400, $01000004, $00000400, $00000004, $01000404, $00010404,
$01010404, $00010004, $01010000, $01000404, $01000004, $00000404, $00010404, $01010400,
$00000404, $01000400, $01000400, $00000000, $00010004, $00010400, $00000000, $01010004),
($80108020, $80008000, $00008000, $00108020, $00100000, $00000020, $80100020, $80008020,
$80000020, $80108020, $80108000, $80000000, $80008000, $00100000, $00000020, $80100020,
$00108000, $00100020, $80008020, $00000000, $80000000, $00008000, $00108020, $80100000,
$00100020, $80000020, $00000000, $00108000, $00008020, $80108000, $80100000, $00008020,
$00000000, $00108020, $80100020, $00100000, $80008020, $80100000, $80108000, $00008000,
$80100000, $80008000, $00000020, $80108020, $00108020, $00000020, $00008000, $80000000,
$00008020, $80108000, $00100000, $80000020, $00100020, $80008020, $80000020, $00100020,
$00108000, $00000000, $80008000, $00008020, $80000000, $80100020, $80108020, $00108000),
($00000208, $08020200, $00000000, $08020008, $08000200, $00000000, $00020208, $08000200,
$00020008, $08000008, $08000008, $00020000, $08020208, $00020008, $08020000, $00000208,
$08000000, $00000008, $08020200, $00000200, $00020200, $08020000, $08020008, $00020208,
$08000208, $00020200, $00020000, $08000208, $00000008, $08020208, $00000200, $08000000,
$08020200, $08000000, $00020008, $00000208, $00020000, $08020200, $08000200, $00000000,
$00000200, $00020008, $08020208, $08000200, $08000008, $00000200, $00000000, $08020008,
$08000208, $00020000, $08000000, $08020208, $00000008, $00020208, $00020200, $08000008,
$08020000, $08000208, $00000208, $08020000, $00020208, $00000008, $08020008, $00020200),
($00802001, $00002081, $00002081, $00000080, $00802080, $00800081, $00800001, $00002001,
$00000000, $00802000, $00802000, $00802081, $00000081, $00000000, $00800080, $00800001,
$00000001, $00002000, $00800000, $00802001, $00000080, $00800000, $00002001, $00002080,
$00800081, $00000001, $00002080, $00800080, $00002000, $00802080, $00802081, $00000081,
$00800080, $00800001, $00802000, $00802081, $00000081, $00000000, $00000000, $00802000,
$00002080, $00800080, $00800081, $00000001, $00802001, $00002081, $00002081, $00000080,
$00802081, $00000081, $00000001, $00002000, $00800001, $00002001, $00802080, $00800081,
$00002001, $00002080, $00800000, $00802001, $00000080, $00800000, $00002000, $00802080),
($00000100, $02080100, $02080000, $42000100, $00080000, $00000100, $40000000, $02080000,
$40080100, $00080000, $02000100, $40080100, $42000100, $42080000, $00080100, $40000000,
$02000000, $40080000, $40080000, $00000000, $40000100, $42080100, $42080100, $02000100,
$42080000, $40000100, $00000000, $42000000, $02080100, $02000000, $42000000, $00080100,
$00080000, $42000100, $00000100, $02000000, $40000000, $02080000, $42000100, $40080100,
$02000100, $40000000, $42080000, $02080100, $40080100, $00000100, $02000000, $42080000,
$42080100, $00080100, $42000000, $42080100, $02080000, $00000000, $40080000, $42000000,
$00080100, $02000100, $40000100, $00080000, $00000000, $40080000, $02080100, $40000100),
($20000010, $20400000, $00004000, $20404010, $20400000, $00000010, $20404010, $00400000,
$20004000, $00404010, $00400000, $20000010, $00400010, $20004000, $20000000, $00004010,
$00000000, $00400010, $20004010, $00004000, $00404000, $20004010, $00000010, $20400010,
$20400010, $00000000, $00404010, $20404000, $00004010, $00404000, $20404000, $20000000,
$20004000, $00000010, $20400010, $00404000, $20404010, $00400000, $00004010, $20000010,
$00400000, $20004000, $20000000, $00004010, $20000010, $20404010, $00404000, $20400000,
$00404010, $20404000, $00000000, $20400010, $00000010, $00004000, $20400000, $00404010,
$00004000, $00400010, $20004010, $00000000, $20404000, $20000000, $00400010, $20004010),
($00200000, $04200002, $04000802, $00000000, $00000800, $04000802, $00200802, $04200800,
$04200802, $00200000, $00000000, $04000002, $00000002, $04000000, $04200002, $00000802,
$04000800, $00200802, $00200002, $04000800, $04000002, $04200000, $04200800, $00200002,
$04200000, $00000800, $00000802, $04200802, $00200800, $00000002, $04000000, $00200800,
$04000000, $00200800, $00200000, $04000802, $04000802, $04200002, $04200002, $00000002,
$00200002, $04000000, $04000800, $00200000, $04200800, $00000802, $00200802, $04200800,
$00000802, $04000002, $04200802, $04200000, $00200800, $00000000, $00000002, $04200802,
$00000000, $00200802, $04200000, $00000800, $04000002, $04000800, $00000800, $00200002),
($10001040, $00001000, $00040000, $10041040, $10000000, $10001040, $00000040, $10000000,
$00040040, $10040000, $10041040, $00041000, $10041000, $00041040, $00001000, $00000040,
$10040000, $10000040, $10001000, $00001040, $00041000, $00040040, $10040040, $10041000,
$00001040, $00000000, $00000000, $10040040, $10000040, $10001000, $00041040, $00040000,
$00041040, $00040000, $10041000, $00001000, $00000040, $10040040, $00001000, $00041040,
$10001000, $00000040, $10000040, $10040000, $10040040, $10000000, $00040000, $10001040,
$00000000, $10041040, $00040040, $10000040, $10040000, $10001000, $10001040, $00000000,
$10041040, $00041000, $00041000, $00001040, $00001040, $00040040, $10000000, $10041000));
var
I, L, R, Work : DWord;
CPtr : PDWord;
procedure SplitBlock(const Block : TDESBlock; var L, R : DWord); register;
asm
push ebx
push eax
mov eax, [eax]
mov bh, al
mov bl, ah
rol ebx, 16
shr eax, 16
mov bh, al
mov bl, ah
mov [edx], ebx
pop eax
mov eax, [eax+4]
mov bh, al
mov bl, ah
rol ebx, 16
shr eax, 16
mov bh, al
mov bl, ah
mov [ecx], ebx
pop ebx
end;
procedure JoinBlock(const L, R : LongInt; var Block : TDESBlock); register;
asm
push ebx
mov bh, al
mov bl, ah
rol ebx, 16
shr eax, 16
mov bh, al
mov bl, ah
mov [ecx+4], ebx
mov bh, dl
mov bl, dh
rol ebx, 16
shr edx, 16
mov bh, dl
mov bl, dh
mov [ecx], ebx
pop ebx
end;
procedure IPerm(var L, R : DWord);
var
Work : DWord;
begin
Work := ((L shr 4) xor R) and $0F0F0F0F;
R := R xor Work;
L := L xor Work shl 4;
Work := ((L shr 16) xor R) and $0000FFFF;
R := R xor Work;
L := L xor Work shl 16;
Work := ((R shr 2) xor L) and $33333333;
L := L xor Work;
R := R xor Work shl 2;
Work := ((R shr 8) xor L) and $00FF00FF;
L := L xor Work;
R := R xor Work shl 8;
R := (R shl 1) or (R shr 31);
Work := (L xor R) and $AAAAAAAA;
L := L xor Work;
R := R xor Work;
L := (L shl 1) or (L shr 31);
end;
procedure FPerm(var L, R : DWord);
var
Work : DWord;
begin
L := L;
R := (R shl 31) or (R shr 1);
Work := (L xor R) and $AAAAAAAA;
L := L xor Work;
R := R xor Work;
L := (L shr 1) or (L shl 31);
Work := ((L shr 8) xor R) and $00FF00FF;
R := R xor Work;
L := L xor Work shl 8;
Work := ((L shr 2) xor R) and $33333333;
R := R xor Work;
L := L xor Work shl 2;
Work := ((R shr 16) xor L) and $0000FFFF;
L := L xor Work;
R := R xor Work shl 16;
Work := ((R shr 4) xor L) and $0F0F0F0F;
L := L xor Work;
R := R xor Work shl 4;
end;
begin
SplitBlock(Block, L, R);
IPerm(L, R);
CPtr := @Context;
for I := 0 to 7 do begin
Work := (((R shr 4) or (R shl 28)) xor CPtr^);
Inc(CPtr);
L := L xor SPBox[6, Work and $3F];
L := L xor SPBox[4, Work shr 8 and $3F];
L := L xor SPBox[2, Work shr 16 and $3F];
L := L xor SPBox[0, Work shr 24 and $3F];
Work := (R xor CPtr^);
Inc(CPtr);
L := L xor SPBox[7, Work and $3F];
L := L xor SPBox[5, Work shr 8 and $3F];
L := L xor SPBox[3, Work shr 16 and $3F];
L := L xor SPBox[1, Work shr 24 and $3F];
Work := (((L shr 4) or (L shl 28)) xor CPtr^);
Inc(CPtr);
R := R xor SPBox[6, Work and $3F];
R := R xor SPBox[4, Work shr 8 and $3F];
R := R xor SPBox[2, Work shr 16 and $3F];
R := R xor SPBox[0, Work shr 24 and $3F];
Work := (L xor CPtr^);
Inc(CPtr);
R := R xor SPBox[7, Work and $3F];
R := R xor SPBox[5, Work shr 8 and $3F];
R := R xor SPBox[3, Work shr 16 and $3F];
R := R xor SPBox[1, Work shr 24 and $3F];
end;
FPerm(L, R);
JoinBlock(L, R, Block);
end;
procedure InitEncryptDES(const Key : TKey64; var Context : TDESContext; Encrypt : Boolean);
const
PC1 : array [0..55] of Byte =
(56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26,
18, 10, 2, 59, 51, 43, 35, 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21,
13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3);
PC2 : array [0..47] of Byte =
(13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9, 22, 18, 11, 3, 25, 7,
15, 6, 26, 19, 12, 1, 40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,
43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31);
CTotRot : array [0..15] of Byte = (1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28);
CBitMask : array [0..7] of Byte = (128, 64, 32, 16, 8, 4, 2, 1);
var
PC1M : array [0..55] of Byte;
PC1R : array [0..55] of Byte;
KS : array [0..7] of Byte;
I, J, L, M : LongInt;
begin
{convert PC1 to bits of key}
for J := 0 to 55 do begin
L := PC1[J];
M := L mod 8;
PC1M[J] := Ord((Key[L div 8] and CBitMask[M]) <> 0);
end;
{key chunk for each iteration}
for I := 0 to 15 do begin
{rotate PC1 the right amount}
for J := 0 to 27 do begin
L := J + CTotRot[I];
if (L < 28) then begin
PC1R[J] := PC1M[L];
PC1R[J + 28] := PC1M[L + 28];
end else begin
PC1R[J] := PC1M[L - 28];
PC1R[J + 28] := PC1M[L];
end;
end;
{select bits individually}
FillChar(KS, SizeOf(KS), 0);
for J := 0 to 47 do
if Boolean(PC1R[PC2[J]]) then begin
L := J div 6;
KS[L] := KS[L] or CBitMask[J mod 6] shr 2;
end;
{now convert to odd/even interleaved form for use in F}
if Encrypt then begin
Context.TransformedKey[I * 2] := (LongInt(KS[0]) shl 24) or (LongInt(KS[2]) shl 16) or
(LongInt(KS[4]) shl 8) or (LongInt(KS[6]));
Context.TransformedKey[I * 2 + 1] := (LongInt(KS[1]) shl 24) or (LongInt(KS[3]) shl 16) or
(LongInt(KS[5]) shl 8) or (LongInt(KS[7]));
end else begin
Context.TransformedKey[31 - (I * 2 + 1)] := (LongInt(KS[0]) shl 24) or (LongInt(KS[2]) shl 16) or
(LongInt(KS[4]) shl 8) or (LongInt(KS[6]));
Context.TransformedKey[31 - (I * 2)] := (LongInt(KS[1]) shl 24) or (LongInt(KS[3]) shl 16) or
(LongInt(KS[5]) shl 8) or (LongInt(KS[7]));
end;
end;
Context.Encrypt := Encrypt;
end;
procedure EncryptDESCBC(const Context : TDESContext; const Prev : TDESBlock; var Block : TDESBlock);
begin
if Context.Encrypt then begin
XorMem(Block, Prev, SizeOf(Block));
EncryptDES(Context, Block);
end else begin
EncryptDES(Context, Block);
XorMem(Block, Prev, SizeOf(Block));
end;
end;
function EncryDes(const str:string;const keystr:string;const ivstr:string):string ;
var key:tkey64;
Context:TDESContext;
Block,iv:TDESBlock;
i,j,len,posnum:smallint;
poschar,xx:char;
xuhuan:integer;
begin
for i:=0 to 7 do begin
if i > (length(keystr)-1) then
key[i] :=0
else
key[i] := byte(keystr[i+1]);
end;
for i:=0 to 7 do begin
if i > (length(ivstr)-1) then
iv[i]:=0
else
iv[i] := byte(ivstr[i+1]);
end;
InitEncryptDES(Key, Context, true);
len := length(AnsiString(str));
xx:= char( 8- (len mod 8));
if len<=8 then
xuhuan:=0
else
xuhuan:=round(len/8);
for i:=0 to xuhuan do
begin
for j:=0 to 7 do
begin
if ((i*8+j+1)<=len) then
begin
poschar:=str[i*8+j+1];
block[j]:=byte(poschar);
end
else
block[j]:=byte(xx);
end;
EncryptDESCBC(Context, IV, Block);
for j:= 0 to 7 do begin
posnum:=block[j];
result := result + inttohex(posnum,2);
end;
iv:=block;
end;
end;
function DecryDessec(const str:string;const keystr:string;const ivstr:string):string ;
var key:tkey64;
Context:TDESContext;
bak,Block,iv:TDESBlock;
i,j,len,posnum:smallint;
poschar,xx:char;
res,lss,temp:string;
begin
temp := keystr;
res := '';
for i:=0 to 7 do begin
if i > (length(temp)-1) then
key[i] :=0
else
key[i] := byte(temp[i+1]);
end;
temp := ivstr;
for i:=0 to 7 do begin
if i > (length(temp)-1) then
iv[i] := 0
else
iv[i] := byte(temp[i+1]);
end;
InitEncryptDES(Key, Context, False);
temp := str;
posnum := 0;
for i:=0 to length(temp)-1 do begin
Block[posnum] := byte(temp[i+1]);
posnum := posnum+1;
if posnum = 8 then begin
bak := block;
EncryptDESCBC(Context, IV, Block);
for j:= 0 to 7 do begin
// temp := temp+inttostr(byte(block[i]))+' ';
res := res + char(block[j]);
end;
iv := bak;
posnum := 0;
end;
end;
if posnum <> 0 then begin
//
end else begin
temp:='';
for i:= 1 to length(res) do begin
temp := temp+char(res[i]);
end;
Result:= trim(temp);
end;
end;
function DecryDes(const str:string;const keystr:string;const ivstr:string):string ;
var key:tkey64;
Context:TDESContext;
bak,Block,iv:TDESBlock;
i,j,len,posnum:smallint;
poschar,xx:char;
res,lss:string;
begin
for i:=0 to 7 do begin
if i > (length(keystr)-1) then
key[i] :=0
else
key[i] := byte(keystr[i+1]);
end;
for i:=0 to 15 do begin
if i > (length(ivstr)-1) then
iv[i]:=0
else
iv[i] := byte(ivstr[i+1]);
end;
InitEncryptDES(Key, Context, false);
res:='';
for j:= 0 to (length(str) div 2)-1 do
begin
lss:=copy(str,j*2+1,2);
res:=res+ char(StrToInt('$'+lss)) ;
end;
len := length(AnsiString(res));
for i:=0 to round(len/8)-1 do
begin
for j:=0 to 7 do
begin
if ((i*7+j+1)<=len) then
begin
poschar:=res[i*8+j+1];
block[j]:=byte(poschar);
end else
begin
block[j]:=byte(xx);
end;
end;
bak:=block;
EncryptDESCBC(Context, IV, Block);
for j:= 0 to 7 do begin
result := result + char(block[j]);
end;
iv:=bak;
end;
end;
end.
dmdes.rar （1个子文件） 
dmdes.pas 15KB
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