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379 lines
10 KiB
Plaintext
379 lines
10 KiB
Plaintext
unit U_md5;
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{
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1、 MD5String、MD5File、MD5Print、MD5Match这四个函数是供调用的。其他是用来辅助这几个函数的子函数。
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2、MD5String为加密字符串。
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3、MD5File为加密这个文件。
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4、MD5Print是将加密后的密文转换成字符串。
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5、MD5Match是用来比较密文是否一致。
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加密字符串aaa MD5String('aaa')
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将加密后的aaa显示出来 MD5Print(MD5String('aaa'))
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比较两次密文是否一致: MD5Match(MD5String('第一次明文'),MD5String('第二次输入的明文'))
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}
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interface
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uses
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Windows,SysUtils;
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type
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MD5Count = array[0..1] of DWORD;
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MD5State = array[0..3] of DWORD;
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MD5Block = array[0..15] of DWORD;
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MD5CBits = array[0..7] of byte;
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MD5Digest = array[0..15] of byte;
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MD5Buffer = array[0..63] of byte;
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MD5Context = record
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State: MD5State;
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Count: MD5Count;
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Buffer: MD5Buffer;
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end;
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procedure MD5Init(var Context: MD5Context);
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procedure MD5Update(var Context: MD5Context; Input: pChar; Length: longword);
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procedure MD5Final(var Context: MD5Context; var Digest: MD5Digest);
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function MD5String(M: string): MD5Digest;
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function MD5File(N: string): MD5Digest;
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function MD5Print(D: MD5Digest): string;
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function MD5Match(D1, D2: MD5Digest): boolean;
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implementation
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var
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PADDING: MD5Buffer = (
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$80, $00, $00, $00, $00, $00, $00, $00,
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$00, $00, $00, $00, $00, $00, $00, $00,
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$00, $00, $00, $00, $00, $00, $00, $00,
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$00, $00, $00, $00, $00, $00, $00, $00,
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$00, $00, $00, $00, $00, $00, $00, $00,
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$00, $00, $00, $00, $00, $00, $00, $00,
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$00, $00, $00, $00, $00, $00, $00, $00,
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$00, $00, $00, $00, $00, $00, $00, $00
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);
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function F(x, y, z: DWORD): DWORD;
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begin
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Result := (x and y) or ((not x) and z);
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end;
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function G(x, y, z: DWORD): DWORD;
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begin
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Result := (x and z) or (y and (not z));
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end;
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function H(x, y, z: DWORD): DWORD;
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begin
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Result := x xor y xor z;
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end;
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function I(x, y, z: DWORD): DWORD;
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begin
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Result := y xor (x or (not z));
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end;
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procedure rot(var x: DWORD; n: BYTE);
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begin
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x := (x shl n) or (x shr (32 - n));
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end;
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procedure FF(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);
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begin
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inc(a, F(b, c, d) + x + ac);
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rot(a, s);
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inc(a, b);
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end;
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procedure GG(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);
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begin
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inc(a, G(b, c, d) + x + ac);
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rot(a, s);
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inc(a, b);
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end;
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procedure HH(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);
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begin
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inc(a, H(b, c, d) + x + ac);
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rot(a, s);
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inc(a, b);
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end;
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procedure II(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);
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begin
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inc(a, I(b, c, d) + x + ac);
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rot(a, s);
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inc(a, b);
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end;
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// -----------------------------------------------------------------------------------------------
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// 加密指定长度(字节)
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procedure Encode(Source, Target: pointer; Count: longword);
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var
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S: PByte;
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T: PDWORD;
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I: longword;
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begin
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S := Source;
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T := Target;
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for I := 1 to Count div 4 do begin
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T^ := S^;
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inc(S);
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T^ := T^ or (S^ shl 8);
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inc(S);
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T^ := T^ or (S^ shl 16);
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inc(S);
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T^ := T^ or (S^ shl 24);
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inc(S);
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inc(T);
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end;
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end;
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// 解密指定字节长度
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procedure Decode(Source, Target: pointer; Count: longword);
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var
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S: PDWORD;
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T: PByte;
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I: longword;
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begin
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S := Source;
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T := Target;
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for I := 1 to Count do
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begin
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T^ := S^ and $ff;
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inc(T);
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T^ := (S^ shr 8) and $ff;
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inc(T);
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T^ := (S^ shr 16) and $ff;
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inc(T);
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T^ := (S^ shr 24) and $ff;
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inc(T);
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inc(S);
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end;
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end;
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// Transform State according to first 64 bytes at Buffer
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procedure Transform(Buffer: pointer; var State: MD5State);
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var
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a, b, c, d: DWORD;
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Block: MD5Block;
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begin
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Encode(Buffer, @Block, 64);
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a := State[0];
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b := State[1];
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c := State[2];
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d := State[3];
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FF (a, b, c, d, Block[ 0], 7, $d76aa478);
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FF (d, a, b, c, Block[ 1], 12, $e8c7b756);
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FF (c, d, a, b, Block[ 2], 17, $242070db);
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FF (b, c, d, a, Block[ 3], 22, $c1bdceee);
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FF (a, b, c, d, Block[ 4], 7, $f57c0faf);
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FF (d, a, b, c, Block[ 5], 12, $4787c62a);
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FF (c, d, a, b, Block[ 6], 17, $a8304613);
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FF (b, c, d, a, Block[ 7], 22, $fd469501);
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FF (a, b, c, d, Block[ 8], 7, $698098d8);
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FF (d, a, b, c, Block[ 9], 12, $8b44f7af);
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FF (c, d, a, b, Block[10], 17, $ffff5bb1);
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FF (b, c, d, a, Block[11], 22, $895cd7be);
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FF (a, b, c, d, Block[12], 7, $6b901122);
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FF (d, a, b, c, Block[13], 12, $fd987193);
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FF (c, d, a, b, Block[14], 17, $a679438e);
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FF (b, c, d, a, Block[15], 22, $49b40821);
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GG (a, b, c, d, Block[ 1], 5, $f61e2562);
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GG (d, a, b, c, Block[ 6], 9, $c040b340);
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GG (c, d, a, b, Block[11], 14, $265e5a51);
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GG (b, c, d, a, Block[ 0], 20, $e9b6c7aa);
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GG (a, b, c, d, Block[ 5], 5, $d62f105d);
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GG (d, a, b, c, Block[10], 9, $2441453);
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GG (c, d, a, b, Block[15], 14, $d8a1e681);
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GG (b, c, d, a, Block[ 4], 20, $e7d3fbc8);
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GG (a, b, c, d, Block[ 9], 5, $21e1cde6);
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GG (d, a, b, c, Block[14], 9, $c33707d6);
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GG (c, d, a, b, Block[ 3], 14, $f4d50d87);
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GG (b, c, d, a, Block[ 8], 20, $455a14ed);
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GG (a, b, c, d, Block[13], 5, $a9e3e905);
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GG (d, a, b, c, Block[ 2], 9, $fcefa3f8);
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GG (c, d, a, b, Block[ 7], 14, $676f02d9);
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GG (b, c, d, a, Block[12], 20, $8d2a4c8a);
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HH (a, b, c, d, Block[ 5], 4, $fffa3942);
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HH (d, a, b, c, Block[ 8], 11, $8771f681);
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HH (c, d, a, b, Block[11], 16, $6d9d6122);
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HH (b, c, d, a, Block[14], 23, $fde5380c);
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HH (a, b, c, d, Block[ 1], 4, $a4beea44);
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HH (d, a, b, c, Block[ 4], 11, $4bdecfa9);
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HH (c, d, a, b, Block[ 7], 16, $f6bb4b60);
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HH (b, c, d, a, Block[10], 23, $bebfbc70);
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HH (a, b, c, d, Block[13], 4, $289b7ec6);
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HH (d, a, b, c, Block[ 0], 11, $eaa127fa);
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HH (c, d, a, b, Block[ 3], 16, $d4ef3085);
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HH (b, c, d, a, Block[ 6], 23, $4881d05);
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HH (a, b, c, d, Block[ 9], 4, $d9d4d039);
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HH (d, a, b, c, Block[12], 11, $e6db99e5);
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HH (c, d, a, b, Block[15], 16, $1fa27cf8);
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HH (b, c, d, a, Block[ 2], 23, $c4ac5665);
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II (a, b, c, d, Block[ 0], 6, $f4292244);
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II (d, a, b, c, Block[ 7], 10, $432aff97);
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II (c, d, a, b, Block[14], 15, $ab9423a7);
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II (b, c, d, a, Block[ 5], 21, $fc93a039);
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II (a, b, c, d, Block[12], 6, $655b59c3);
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II (d, a, b, c, Block[ 3], 10, $8f0ccc92);
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II (c, d, a, b, Block[10], 15, $ffeff47d);
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II (b, c, d, a, Block[ 1], 21, $85845dd1);
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II (a, b, c, d, Block[ 8], 6, $6fa87e4f);
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II (d, a, b, c, Block[15], 10, $fe2ce6e0);
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II (c, d, a, b, Block[ 6], 15, $a3014314);
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II (b, c, d, a, Block[13], 21, $4e0811a1);
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II (a, b, c, d, Block[ 4], 6, $f7537e82);
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II (d, a, b, c, Block[11], 10, $bd3af235);
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II (c, d, a, b, Block[ 2], 15, $2ad7d2bb);
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II (b, c, d, a, Block[ 9], 21, $eb86d391);
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inc(State[0], a);
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inc(State[1], b);
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inc(State[2], c);
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inc(State[3], d);
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end;
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// -----------------------------------------------------------------------------------------------
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// 初始化给定内容
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procedure MD5Init(var Context: MD5Context);
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begin
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with Context do
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begin
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State[0] := $67452301;
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State[1] := $efcdab89;
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State[2] := $98badcfe;
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State[3] := $10325476;
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Count[0] := 0;
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Count[1] := 0;
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ZeroMemory(@Buffer, SizeOf(MD5Buffer));
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end;
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end;
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// 更新给定内容 Update given Context to include Length bytes of Input
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procedure MD5Update(var Context: MD5Context; Input: pChar; Length: longword);
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var
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Index: longword;
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PartLen: longword;
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I: longword;
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begin
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with Context do
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begin
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Index := (Count[0] shr 3) and $3f;
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inc(Count[0], Length shl 3);
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if Count[0] < (Length shl 3) then inc(Count[1]);
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inc(Count[1], Length shr 29);
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end;
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PartLen := 64 - Index;
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if Length >= PartLen then
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begin
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CopyMemory(@Context.Buffer[Index], Input, PartLen);
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Transform(@Context.Buffer, Context.State);
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I := PartLen;
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while I + 63 < Length do
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begin
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Transform(@Input[I], Context.State);
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inc(I, 64);
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end;
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Index := 0;
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end
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else I := 0;
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CopyMemory(@Context.Buffer[Index], @Input[I], Length - I);
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end;
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// Finalize given Context, create Digest and zeroize Context
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procedure MD5Final(var Context: MD5Context; var Digest: MD5Digest);
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var
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Bits: MD5CBits;
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Index: longword;
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PadLen: longword;
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begin
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Decode(@Context.Count, @Bits, 2);
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Index := (Context.Count[0] shr 3) and $3f;
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if Index < 56 then PadLen := 56 - Index else PadLen := 120 - Index;
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MD5Update(Context, @PADDING, PadLen);
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MD5Update(Context, @Bits, 8);
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Decode(@Context.State, @Digest, 4);
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ZeroMemory(@Context, SizeOf(MD5Context));
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end;
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// -----------------------------------------------------------------------------------------------
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// Create digest of given Message
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function MD5String(M: string): MD5Digest;
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var
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Context: MD5Context;
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begin
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MD5Init(Context);
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MD5Update(Context, pChar(M), length(M));
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MD5Final(Context, Result);
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end;
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// Create digest of file with given Name
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function MD5File(N: string): MD5Digest;
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var
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FileHandle: THandle;
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MapHandle: THandle;
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ViewPointer: pointer;
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Context: MD5Context;
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begin
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MD5Init(Context);
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FileHandle := CreateFile(pChar(N), GENERIC_READ, FILE_SHARE_READ or FILE_SHARE_WRITE,
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nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL or FILE_FLAG_SEQUENTIAL_SCAN, 0);
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if FileHandle <> INVALID_HANDLE_value then
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try
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MapHandle := CreateFileMapping(FileHandle, nil, PAGE_READONLY, 0, 0, nil);
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if MapHandle <> 0 then
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try
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ViewPointer := MapViewOfFile(MapHandle, FILE_MAP_READ, 0, 0, 0);
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if ViewPointer <> nil then
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try
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MD5Update(Context, ViewPointer, GetFileSize(FileHandle, nil));
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finally
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UnmapViewOfFile(ViewPointer);
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end;
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finally
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CloseHandle(MapHandle);
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end;
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finally
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CloseHandle(FileHandle);
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end;
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MD5Final(Context, Result);
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end;
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// Create hex representation of given Digest
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function MD5Print(D: MD5Digest): string;
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var
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I: byte;
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const
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Digits: array[0..15] of char =
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('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f');
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begin
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Result := '';
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for I := 0 to 15 do Result := Result + Digits[(D[I] shr 4) and $0f] + Digits[D[I] and $0f];
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end;
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// -----------------------------------------------------------------------------------------------
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// Compare two Digests
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function MD5Match(D1, D2: MD5Digest): boolean;
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var
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I: byte;
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begin
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I := 0;
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Result := TRUE;
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while Result and (I < 16) do
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begin
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Result := D1[I] = D2[I];
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inc(I);
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end;
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end;
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end.
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