congrats on re-inventing the wheel. all those string allocations/de-allocations could make it slow.
On Sun, Mar 24, 2013 at 6:12 AM, silvioprog <silviop...@gmail.com> wrote: > Eureka! > > After spending all day working on it, I finally did it! The pseudo steps > are here: > http://en.wikipedia.org/wiki/Hash-based_message_authentication_code > > And, this is the final code (please improves it please): > > uses > SHA1; > > function SHA1Raw(const ABuffer; const ABufferLength: PtrUInt): string; > var > I: Byte; > VBytes : TBytes; > VDigest: TSHA1Digest; > VContext: TSHA1Context; > begin > Result := ''; > SHA1Init(VContext); > SHA1Update(VContext, ABuffer, ABufferLength); > SHA1Final(VContext, VDigest); > SetLength(VBytes, 20); > Move(VDigest, VBytes[0], 20); > for I := 0 to 19 do > Result := Result + Char(VBytes[I]); > end; > > function HMACSHA1(const AKey, AMessage: string): string; > const > BLOCK_SIZE = 64; > var > I: Byte; > VKey: string; > VLenght: PtrUInt; > VOPadStr, VIPadStr: string; > VOPad, VIPad: array[1..BLOCK_SIZE] of Byte; > begin > VLenght := Length(AKey); > if VLenght > BLOCK_SIZE then > begin > SetLength(VKey, BLOCK_SIZE); > FillChar(Pointer(VKey)^, BLOCK_SIZE, #0); > VKey := SHA1Raw(Pointer(AKey)^, VLenght) + VKey; > end > else > begin > SetLength(VKey, BLOCK_SIZE - VLenght); > FillChar(Pointer(VKey)^, BLOCK_SIZE - VLenght, #0); > VKey := AKey + VKey; > end; > FillChar(VOPad, BLOCK_SIZE, $5c); > FillChar(VIPad, BLOCK_SIZE, $36); > for I := 1 to BLOCK_SIZE do > begin > VOPad[I] := VOPad[I] xor Byte(VKey[I]); > VIPad[I] := VIPad[I] xor Byte(VKey[I]); > end; > SetLength(VOPadStr, BLOCK_SIZE); > Move(VOPad, Pointer(VOPadStr)^, BLOCK_SIZE); > SetLength(VIPadStr, BLOCK_SIZE); > Move(VIPad, Pointer(VIPadStr)^, BLOCK_SIZE); > VIPadStr := VIPadStr + AMessage; > Result := SHA1Print(SHA1String(VOPadStr + > SHA1Raw(Pointer(VIPadStr)^, Length(VIPadStr)))); > end; > > Usage: > > WriteLn(HMACSHA1('key', 'The quick brown fox jumped over the lazy dog.')). > > Result: 0b7252985d63555b31db4755f37efe218c509711 (same result in PHP, JS > and Phyton! ;) ) > > So, can you add this code (I'll make HMACMD5 too) in FCL hashes? > (>fpc\VER\source\packages\hash\src) > > Thank you very much buddies! :) > > -- > Silvio Clécio > My public projects - github.com/silvioprog > > _______________________________________________ > fpc-pascal maillist - fpc-pascal@lists.freepascal.org > http://lists.freepascal.org/mailman/listinfo/fpc-pascal >
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