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flcHash.pas
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flcHash.pas
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{******************************************************************************}
{ }
{ Library: Fundamentals 5.00 }
{ File name: flcHash.pas }
{ File version: 5.20 }
{ Description: Hashing functions }
{ }
{ Copyright: Copyright (c) 1999-2016, David J Butler }
{ All rights reserved. }
{ Redistribution and use in source and binary forms, with }
{ or without modification, are permitted provided that }
{ the following conditions are met: }
{ Redistributions of source code must retain the above }
{ copyright notice, this list of conditions and the }
{ following disclaimer. }
{ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND }
{ CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED }
{ WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED }
{ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A }
{ PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL }
{ THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, }
{ INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR }
{ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, }
{ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF }
{ USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) }
{ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER }
{ IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING }
{ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE }
{ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE }
{ POSSIBILITY OF SUCH DAMAGE. }
{ }
{ Github: https://github.com/fundamentalslib }
{ E-mail: fundamentals.library at gmail.com }
{ }
{ Revision history: }
{ }
{ 2002/04/02 0.01 Initial version from cUtils unit. }
{ Hash: Checksum, XOR, CRC, MD5, SHA1, SHA256, SNS }
{ Keyed hash: HMAC-MD5, HMAC-SHA1 }
{ 2002/04/03 0.02 Securely clear passwords from memory after use. }
{ 2002/04/05 0.03 Added SNS hashing. }
{ 2002/04/19 0.04 Added ISBN checksum. }
{ 2003/07/26 0.05 Added ELF hashing. }
{ 2003/09/08 3.06 Revised for Fundamentals 3. }
{ 2005/07/22 4.07 Compilable with FreePascal 2.0 Win32 i386. }
{ 2005/08/27 4.08 Revised for Fundamentals 4. }
{ 2008/04/28 4.09 Added Adler hashing. }
{ 2008/12/30 4.10 Revision. }
{ 2010/06/27 4.11 Compilable with FreePascal 2.4.0 OSX x86-64 }
{ 2010/11/14 4.12 Added SHA256. }
{ 2010/11/15 4.13 Added HMAC-SHA256. }
{ 2010/11/16 4.14 Added SHA512. }
{ 2010/11/17 4.15 Added HMAC-SHA512, SHA224, SHA384. }
{ 2011/04/02 4.16 Compilable with Delphi 5. }
{ 2011/10/14 4.17 Compilable with Delphi XE. }
{ 2013/01/27 4.18 Added RipeMD160 sponsored and donated by Stefan Westner. }
{ 2016/01/09 5.19 Revised for Fundamentals 5. }
{ 2016/01/29 5.20 Fix in SecureClear for constant string references. }
{ }
{ Supported compilers: }
{ }
{ Delphi 7 Win32 5.19 2016/01/09 }
{ Delphi XE7 Win32 5.19 2016/01/09 }
{ Delphi XE7 Win64 5.19 2016/01/09 }
{ Delphi 10 Win32 5.19 2016/01/09 }
{ Delphi 10 Win64 5.19 2016/01/09 }
{ FreePascal 2 Win32 i386 }
{ FreePascal 2 Linux i386 }
{ }
{ Definitions: }
{ }
{ Hashes are algorithms for computing condensed representations of }
{ messages. }
{ The message is the data being condensed. }
{ The condensed representation is called the message digest. }
{ }
{ Hashes are called secure if it is computationally infeasible to }
{ find a message that produce a given digest. }
{ }
{ Keyed hashes use a key (password) in the hashing process. }
{ }
{ Hash algorithms: }
{ }
{ Algorithm Digest size (bits) Uses }
{ ------------ ------------------ ------------------------------ }
{ Checksum 32 General }
{ XOR8 8 General }
{ XOR16 16 General }
{ XOR32 32 General }
{ CRC16 16 General / Error detection }
{ CRC32 32 General / Error detection }
{ Adler32 32 General }
{ ELF 32 General }
{ Knuth 32 General }
{ MD5 128 Secure hash }
{ SHA1 160 Secure hash }
{ SHA256 256 Secure hash }
{ SHA512 512 Secure hash }
{ RipeMD160 160 Secure hash }
{ HMAC/MD5 128 Secure keyed hash }
{ HMAC/SHA1 160 Secure keyed hash }
{ HMAC/SHA256 256 Secure keyed hash }
{ HMAC/SHA512 512 Secure keyed hash }
{ }
{ Other: }
{ }
{ Algorithm Type }
{ ------------ -------------------------------------------------- }
{ ISBN Check-digit for International Standard Book Number }
{ LUHN Check-digit for credit card numbers }
{ }
{******************************************************************************}
{$INCLUDE flcInclude.inc}
{$IFDEF FREEPASCAL}
{$WARNINGS OFF}{$HINTS OFF}
{$Q-,R-} // bug in fpc
{$ENDIF}
{$IFDEF DEBUG}
{$IFDEF TEST}
{$DEFINE HASH_TEST}
{$ENDIF}
{$ENDIF}
unit flcHash;
interface
uses
{ System }
SysUtils;
{ }
{ System type definitions }
{ }
{$IFNDEF SupportRawByteString}
type
RawByteString = AnsiString;
PRawByteString = ^RawByteString;
{$ENDIF}
{$IFNDEF SupportUnicodeString}
type
UnicodeString = WideString;
PUnicodeString = ^UnicodeString;
{$ENDIF}
{ }
{ Hash digests }
{ }
type
PByte = ^Byte;
PWord = ^Word;
PLongWord = ^LongWord;
Word64 = packed record
case Integer of
0 : (Bytes : array[0..7] of Byte);
1 : (Words : array[0..3] of Word);
2 : (LongWords : array[0..1] of LongWord);
end;
PWord64 = ^Word64;
T128BitDigest = record
case integer of
0 : (Int64s : array[0..1] of Int64);
1 : (Longs : array[0..3] of LongWord);
2 : (Words : array[0..7] of Word);
3 : (Bytes : array[0..15] of Byte);
end;
P128BitDigest = ^T128BitDigest;
T160BitDigest = record
case integer of
0 : (Longs : array[0..4] of LongWord);
1 : (Words : array[0..9] of Word);
2 : (Bytes : array[0..19] of Byte);
end;
P160BitDigest = ^T160BitDigest;
T224BitDigest = record
case integer of
0 : (Longs : array[0..6] of LongWord);
1 : (Words : array[0..13] of Word);
2 : (Bytes : array[0..27] of Byte);
end;
P224BitDigest = ^T224BitDigest;
T256BitDigest = record
case integer of
0 : (Longs : array[0..7] of LongWord);
1 : (Words : array[0..15] of Word);
2 : (Bytes : array[0..31] of Byte);
end;
P256BitDigest = ^T256BitDigest;
T384BitDigest = record
case integer of
0 : (Word64s : array[0..5] of Word64);
1 : (Longs : array[0..11] of LongWord);
2 : (Words : array[0..23] of Word);
3 : (Bytes : array[0..47] of Byte);
end;
P384BitDigest = ^T384BitDigest;
T512BitDigest = record
case integer of
0 : (Word64s : array[0..7] of Word64);
1 : (Longs : array[0..15] of LongWord);
2 : (Words : array[0..31] of Word);
3 : (Bytes : array[0..63] of Byte);
end;
P512BitDigest = ^T512BitDigest;
T512BitBuf = array[0..63] of Byte;
T1024BitBuf = array[0..127] of Byte;
const
MaxHashDigestSize = Sizeof(T160BitDigest);
procedure DigestToHexBufA(const Digest; const Size: Integer; const Buf);
procedure DigestToHexBufW(const Digest; const Size: Integer; const Buf);
function DigestToHexA(const Digest; const Size: Integer): RawByteString;
function DigestToHexW(const Digest; const Size: Integer): WideString;
function DigestToBufA(const Digest; const Size: Integer): RawByteString;
function Digest128Equal(const Digest1, Digest2: T128BitDigest): Boolean;
function Digest160Equal(const Digest1, Digest2: T160BitDigest): Boolean;
function Digest224Equal(const Digest1, Digest2: T224BitDigest): Boolean;
function Digest256Equal(const Digest1, Digest2: T256BitDigest): Boolean;
function Digest384Equal(const Digest1, Digest2: T384BitDigest): Boolean;
function Digest512Equal(const Digest1, Digest2: T512BitDigest): Boolean;
procedure Digest512XOR8(var Digest: T512BitDigest; const A: Byte);
procedure Digest512XOR32(var Digest: T512BitDigest; const A: LongWord);
{ }
{ Hash errors }
{ }
const
hashNoError = 0;
hashInternalError = 1;
hashInvalidHashType = 2;
hashInvalidBuffer = 3;
hashInvalidBufferSize = 4;
hashInvalidDigest = 5;
hashInvalidKey = 6;
hashInvalidFileName = 7;
hashFileOpenError = 8;
hashFileSeekError = 9;
hashFileReadError = 10;
hashNotKeyedHashType = 11;
hashTooManyOpenHandles = 12;
hashInvalidHandle = 13;
hashMAX_ERROR = 13;
function GetHashErrorMessage(const ErrorCode: LongWord): PChar;
type
EHashError = class(Exception)
protected
FErrorCode : LongWord;
public
constructor Create(const ErrorCode: LongWord; const Msg: String = '');
property ErrorCode: LongWord read FErrorCode;
end;
{ }
{ Secure memory clear }
{ Used to clear keys and other sensitive data from memory }
{ }
procedure SecureClear(var Buf; const BufSize: Integer);
procedure SecureClear512(var Buf: T512BitBuf);
procedure SecureClear1024(var Buf: T1024BitBuf);
procedure SecureClearStr(var S: String);
procedure SecureClearStrB(var S: RawByteString);
procedure SecureClearStrW(var S: WideString);
procedure SecureClearStrU(var S: UnicodeString);
{ }
{ Checksum hashing }
{ }
function CalcChecksum32(const Buf; const BufSize: Integer): LongWord; overload;
function CalcChecksum32(const Buf: RawByteString): LongWord; overload;
{ }
{ XOR hashing }
{ }
function CalcXOR8(const Buf; const BufSize: Integer): Byte; overload;
function CalcXOR8(const Buf: RawByteString): Byte; overload;
function CalcXOR16(const Buf; const BufSize: Integer): Word; overload;
function CalcXOR16(const Buf: RawByteString): Word; overload;
function CalcXOR32(const Buf; const BufSize: Integer): LongWord; overload;
function CalcXOR32(const Buf: RawByteString): LongWord; overload;
{ }
{ CRC 16 hashing }
{ }
{ The theory behind CCITT V.41 CRCs: }
{ }
{ 1. Select the magnitude of the CRC to be used (typically 16 or 32 }
{ bits) and choose the polynomial to use. In the case of 16 bit }
{ CRCs, the CCITT polynomial is recommended and is }
{ }
{ 16 12 5 }
{ G(x) = x + x + x + 1 }
{ }
{ This polynomial traps 100% of 1 bit, 2 bit, odd numbers of bit }
{ errors, 100% of <= 16 bit burst errors and over 99% of all }
{ other errors. }
{ }
{ 2. The CRC is calculated as }
{ r }
{ D(x) = (M(x) * 2 ) mod G(x) }
{ }
{ This may be better described as : Add r bits (0 content) to }
{ the end of M(x). Divide this by G(x) and the remainder is the }
{ CRC. }
{ }
{ 3. Tag the CRC onto the end of M(x). }
{ }
{ 4. To check it, calculate the CRC of the new message D(x), using }
{ the same process as in 2. above. The newly calculated CRC }
{ should be zero. }
{ }
{ This effectively means that using CRCs, it is possible to calculate a }
{ series of bits to tag onto the data which makes the data an exact }
{ multiple of the polynomial. }
{ }
procedure CRC16Init(var CRC16: Word);
function CRC16Byte(const CRC16: Word; const Octet: Byte): Word;
function CRC16Buf(const CRC16: Word; const Buf; const BufSize: Integer): Word;
function CalcCRC16(const Buf; const BufSize: Integer): Word; overload;
function CalcCRC16(const Buf: RawByteString): Word; overload;
{ }
{ CRC 32 hashing }
{ }
procedure SetCRC32Poly(const Poly: LongWord);
procedure CRC32Init(var CRC32: LongWord);
function CRC32Byte(const CRC32: LongWord; const Octet: Byte): LongWord;
function CRC32Buf(const CRC32: LongWord; const Buf; const BufSize: Integer): LongWord;
function CRC32BufNoCase(const CRC32: LongWord; const Buf; const BufSize: Integer): LongWord;
function CalcCRC32(const Buf; const BufSize: Integer): LongWord; overload;
function CalcCRC32(const Buf: RawByteString): LongWord; overload;
{ }
{ Adler 32 hashing }
{ }
procedure Adler32Init(var Adler32: LongWord);
function Adler32Byte(const Adler32: LongWord; const Octet: Byte): LongWord;
function Adler32Buf(const Adler32: LongWord; const Buf; const BufSize: Integer): LongWord;
function CalcAdler32(const Buf; const BufSize: Integer): LongWord; overload;
function CalcAdler32(const Buf: RawByteString): LongWord; overload;
{ }
{ ELF hashing }
{ }
procedure ELFInit(var Digest: LongWord);
function ELFBuf(const Digest: LongWord; const Buf; const BufSize: Integer): LongWord;
function CalcELF(const Buf; const BufSize: Integer): LongWord; overload;
function CalcELF(const Buf: RawByteString): LongWord; overload;
{ }
{ ISBN checksum }
{ }
function IsValidISBN(const S: RawByteString): Boolean;
{ }
{ LUHN checksum }
{ }
{ The LUHN forumula (also known as mod-10) is used in major credit card }
{ account numbers for validity checking. }
{ }
function IsValidLUHN(const S: RawByteString): Boolean;
{ }
{ Knuth hash }
{ General purpose string hashing function proposed by Donald E Knuth in }
{ 'The Art of Computer Programming Vol 3'. }
{ }
function KnuthHashA(const S: RawByteString): LongWord;
function KnuthHashW(const S: WideString): LongWord;
{ }
{ MD5 hash }
{ }
{ MD5 is an Internet standard secure hashing function, that was }
{ developed by Professor Ronald L. Rivest in 1991. Subsequently it has }
{ been placed in the public domain. }
{ MD5 was developed to be more secure after MD4 was 'broken'. }
{ Den Boer and Bosselaers estimate that if a custom machine were to be }
{ built specifically to find collisions for MD5 (costing $10m in 1994) it }
{ would on average take 24 days to find a collision. }
{ }
procedure MD5InitDigest(var Digest: T128BitDigest);
procedure MD5Buf(var Digest: T128BitDigest; const Buf; const BufSize: Integer);
procedure MD5FinalBuf(var Digest: T128BitDigest; const Buf; const BufSize: Integer;
const TotalSize: Int64);
function CalcMD5(const Buf; const BufSize: Integer): T128BitDigest; overload;
function CalcMD5(const Buf: RawByteString): T128BitDigest; overload;
function MD5DigestToStrA(const Digest: T128BitDigest): RawByteString;
function MD5DigestToHexA(const Digest: T128BitDigest): RawByteString;
function MD5DigestToHexW(const Digest: T128BitDigest): WideString;
{ }
{ SHA1 Hashing }
{ }
{ Specification at http://www.itl.nist.gov/fipspubs/fip180-1.htm }
{ Also see RFC 3174. }
{ SHA1 was developed by NIST and is specified in the Secure Hash Standard }
{ (SHS, FIPS 180) and corrects an unpublished flaw the original SHA }
{ algorithm. }
{ SHA1 produces a 160-bit digest and is considered more secure than MD5. }
{ SHA1 has a similar design to the MD4-family of hash functions. }
{ }
const
SHA1DigestBits = 160;
SHA1DigestSize = SHA1DigestBits div 8;
procedure SHA1InitDigest(var Digest: T160BitDigest);
procedure SHA1Buf(var Digest: T160BitDigest; const Buf; const BufSize: Integer);
procedure SHA1FinalBuf(var Digest: T160BitDigest; const Buf; const BufSize: Integer;
const TotalSize: Int64);
function CalcSHA1(const Buf; const BufSize: Integer): T160BitDigest; overload;
function CalcSHA1(const Buf: RawByteString): T160BitDigest; overload;
function SHA1DigestToStrA(const Digest: T160BitDigest): RawByteString;
function SHA1DigestToHexA(const Digest: T160BitDigest): RawByteString;
function SHA1DigestToHexW(const Digest: T160BitDigest): WideString;
{ }
{ SHA224 Hashing }
{ }
{ 224 bit SHA-2 hash }
{ http://en.wikipedia.org/wiki/SHA-2 }
{ SHA-224 is based on SHA-256 }
{ }
procedure SHA224InitDigest(var Digest: T256BitDigest);
procedure SHA224Buf(var Digest: T256BitDigest; const Buf; const BufSize: Integer);
procedure SHA224FinalBuf(var Digest: T256BitDigest; const Buf; const BufSize: Integer; const TotalSize: Int64;
var OutDigest: T224BitDigest);
function CalcSHA224(const Buf; const BufSize: Integer): T224BitDigest; overload;
function CalcSHA224(const Buf: RawByteString): T224BitDigest; overload;
function SHA224DigestToStrA(const Digest: T224BitDigest): RawByteString;
function SHA224DigestToHexA(const Digest: T224BitDigest): RawByteString;
function SHA224DigestToHexW(const Digest: T224BitDigest): WideString;
{ }
{ SHA256 Hashing }
{ 256 bit SHA-2 hash }
{ }
procedure SHA256InitDigest(var Digest: T256BitDigest);
procedure SHA256Buf(var Digest: T256BitDigest; const Buf; const BufSize: Integer);
procedure SHA256FinalBuf(var Digest: T256BitDigest; const Buf; const BufSize: Integer; const TotalSize: Int64);
function CalcSHA256(const Buf; const BufSize: Integer): T256BitDigest; overload;
function CalcSHA256(const Buf: RawByteString): T256BitDigest; overload;
function SHA256DigestToStrA(const Digest: T256BitDigest): RawByteString;
function SHA256DigestToHexA(const Digest: T256BitDigest): RawByteString;
function SHA256DigestToHexW(const Digest: T256BitDigest): WideString;
{ }
{ SHA384 Hashing }
{ 384 bit SHA-2 hash }
{ SHA-384 is based on SHA-512 }
{ }
procedure SHA384InitDigest(var Digest: T512BitDigest);
procedure SHA384Buf(var Digest: T512BitDigest; const Buf; const BufSize: Integer);
procedure SHA384FinalBuf(var Digest: T512BitDigest; const Buf; const BufSize: Integer; const TotalSize: Int64; var OutDigest: T384BitDigest);
function CalcSHA384(const Buf; const BufSize: Integer): T384BitDigest; overload;
function CalcSHA384(const Buf: RawByteString): T384BitDigest; overload;
function SHA384DigestToStrA(const Digest: T384BitDigest): RawByteString;
function SHA384DigestToHexA(const Digest: T384BitDigest): RawByteString;
function SHA384DigestToHexW(const Digest: T384BitDigest): WideString;
{ }
{ SHA512 Hashing }
{ 512 bit SHA-2 hash }
{ }
procedure SHA512InitDigest(var Digest: T512BitDigest);
procedure SHA512Buf(var Digest: T512BitDigest; const Buf; const BufSize: Integer);
procedure SHA512FinalBuf(var Digest: T512BitDigest; const Buf; const BufSize: Integer; const TotalSize: Int64);
function CalcSHA512(const Buf; const BufSize: Integer): T512BitDigest; overload;
function CalcSHA512(const Buf: RawByteString): T512BitDigest; overload;
function SHA512DigestToStrA(const Digest: T512BitDigest): RawByteString;
function SHA512DigestToHexA(const Digest: T512BitDigest): RawByteString;
function SHA512DigestToHexW(const Digest: T512BitDigest): WideString;
{ }
{ RIPEMD160 }
{ }
{ RIPEMD-160 is a 160-bit cryptographic hash function, designed by }
{ Hans Dobbertin, Antoon Bosselaers, and Bart Preneel. It is intended to }
{ be used as a secure replacement for the 128-bit hash functions MD4, MD5, }
{ and RIPEMD. }
{ The authors of RIPEMD-160 and RIPEMD-128 do not hold any patents on the }
{ algorithms (nor on the optional extensions), and are also not aware of }
{ any patents on these algorithms. }
{ }
procedure RipeMD160InitDigest(var Digest: T160BitDigest);
procedure RipeMD160Buf(var Digest: T160BitDigest; const Buf; const BufSize: Integer);
procedure RipeMD160FinalBuf(var Digest: T160BitDigest; const Buf; const BufSize: Integer; const TotalSize: Int64);
function CalcRipeMD160(const Buf; const BufSize: Integer): T160BitDigest; overload;
function CalcRipeMD160(const Buf: RawByteString): T160BitDigest; overload;
function RipeMD160DigestToStrA(const Digest: T160BitDigest): RawByteString;
function RipeMD160DigestToHexA(const Digest: T160BitDigest): RawByteString;
function RipeMD160DigestToHexW(const Digest: T160BitDigest): WideString;
{ }
{ HMAC-MD5 keyed hashing }
{ }
{ HMAC allows secure keyed hashing (hashing with a password). }
{ HMAC was designed to meet the requirements of the IPSEC working group in }
{ the IETF, and is now a standard. }
{ HMAC, are proven to be secure as long as the underlying hash function }
{ has some reasonable cryptographic strengths. }
{ See RFC 2104 for details on HMAC. }
{ }
procedure HMAC_MD5Init(const Key: Pointer; const KeySize: Integer;
var Digest: T128BitDigest; var K: T512BitBuf);
procedure HMAC_MD5Buf(var Digest: T128BitDigest; const Buf; const BufSize: Integer);
procedure HMAC_MD5FinalBuf(const K: T512BitBuf; var Digest: T128BitDigest;
const Buf; const BufSize: Integer; const TotalSize: Int64);
function CalcHMAC_MD5(const Key: Pointer; const KeySize: Integer;
const Buf; const BufSize: Integer): T128BitDigest; overload;
function CalcHMAC_MD5(const Key: RawByteString; const Buf; const BufSize: Integer): T128BitDigest; overload;
function CalcHMAC_MD5(const Key, Buf: RawByteString): T128BitDigest; overload;
{ }
{ HMAC-SHA1 keyed hashing }
{ }
procedure HMAC_SHA1Init(const Key: Pointer; const KeySize: Integer;
var Digest: T160BitDigest; var K: T512BitBuf);
procedure HMAC_SHA1Buf(var Digest: T160BitDigest; const Buf; const BufSize: Integer);
procedure HMAC_SHA1FinalBuf(const K: T512BitBuf; var Digest: T160BitDigest;
const Buf; const BufSize: Integer; const TotalSize: Int64);
function CalcHMAC_SHA1(const Key: Pointer; const KeySize: Integer;
const Buf; const BufSize: Integer): T160BitDigest; overload;
function CalcHMAC_SHA1(const Key: RawByteString; const Buf; const BufSize: Integer): T160BitDigest; overload;
function CalcHMAC_SHA1(const Key, Buf: RawByteString): T160BitDigest; overload;
{ }
{ HMAC-SHA256 keyed hashing }
{ }
procedure HMAC_SHA256Init(const Key: Pointer; const KeySize: Integer;
var Digest: T256BitDigest; var K: T512BitBuf);
procedure HMAC_SHA256Buf(var Digest: T256BitDigest; const Buf; const BufSize: Integer);
procedure HMAC_SHA256FinalBuf(const K: T512BitBuf; var Digest: T256BitDigest;
const Buf; const BufSize: Integer; const TotalSize: Int64);
function CalcHMAC_SHA256(const Key: Pointer; const KeySize: Integer;
const Buf; const BufSize: Integer): T256BitDigest; overload;
function CalcHMAC_SHA256(const Key: RawByteString; const Buf; const BufSize: Integer): T256BitDigest; overload;
function CalcHMAC_SHA256(const Key, Buf: RawByteString): T256BitDigest; overload;
{ }
{ HMAC-SHA512 keyed hashing }
{ }
procedure HMAC_SHA512Init(const Key: Pointer; const KeySize: Integer; var Digest: T512BitDigest; var K: T1024BitBuf);
procedure HMAC_SHA512Buf(var Digest: T512BitDigest; const Buf; const BufSize: Integer);
procedure HMAC_SHA512FinalBuf(const K: T1024BitBuf; var Digest: T512BitDigest; const Buf; const BufSize: Integer; const TotalSize: Int64);
function CalcHMAC_SHA512(const Key: Pointer; const KeySize: Integer;
const Buf; const BufSize: Integer): T512BitDigest; overload;
function CalcHMAC_SHA512(const Key: RawByteString; const Buf; const BufSize: Integer): T512BitDigest; overload;
function CalcHMAC_SHA512(const Key, Buf: RawByteString): T512BitDigest; overload;
{ }
{ Hash class wrappers }
{ }
type
{ AHash }
{ Base class for hash classes. }
AHash = class
protected
FDigest : Pointer;
FTotalSize : Int64;
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); virtual; abstract;
procedure ProcessBuf(const Buf; const BufSize: Integer); virtual; abstract;
procedure ProcessFinalBuf(const Buf; const BufSize: Integer; const TotalSize: Int64); virtual;
public
class function DigestSize: Integer; virtual; abstract;
class function BlockSize: Integer; virtual;
procedure Init(const Digest: Pointer; const Key: Pointer = nil;
const KeySize: Integer = 0); overload;
procedure Init(const Digest: Pointer; const Key: RawByteString = ''); overload;
procedure HashBuf(const Buf; const BufSize: Integer; const FinalBuf: Boolean);
procedure HashFile(const FileName: String; const Offset: Int64 = 0;
const MaxCount: Int64 = -1);
end;
THashClass = class of AHash;
{ TChecksum32Hash }
TChecksum32Hash = class(AHash)
protected
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
public
class function DigestSize: Integer; override;
end;
{ TXOR8Hash }
TXOR8Hash = class(AHash)
protected
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
public
class function DigestSize: Integer; override;
end;
{ TXOR16Hash }
TXOR16Hash = class(AHash)
protected
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
public
class function DigestSize: Integer; override;
end;
{ TXOR32Hash }
TXOR32Hash = class(AHash)
protected
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
public
class function DigestSize: Integer; override;
end;
{ TCRC16Hash }
TCRC16Hash = class(AHash)
protected
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
public
class function DigestSize: Integer; override;
end;
{ TCRC32Hash }
TCRC32Hash = class(AHash)
protected
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
public
class function DigestSize: Integer; override;
end;
{ TAdler32Hash }
TAdler32Hash = class(AHash)
protected
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
public
class function DigestSize: Integer; override;
end;
{ TELFHash }
TELFHash = class(AHash)
protected
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
public
class function DigestSize: Integer; override;
end;
{ TMD5Hash }
TMD5Hash = class(AHash)
protected
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
procedure ProcessFinalBuf(const Buf; const BufSize: Integer; const TotalSize: Int64); override;
public
class function DigestSize: Integer; override;
class function BlockSize: Integer; override;
end;
{ TSHA1Hash }
TSHA1Hash = class(AHash)
protected
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
procedure ProcessFinalBuf(const Buf; const BufSize: Integer; const TotalSize: Int64); override;
public
class function DigestSize: Integer; override;
class function BlockSize: Integer; override;
end;
{ TSHA256Hash }
TSHA256Hash = class(AHash)
protected
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
procedure ProcessFinalBuf(const Buf; const BufSize: Integer; const TotalSize: Int64); override;
public
class function DigestSize: Integer; override;
class function BlockSize: Integer; override;
end;
{ TSHA512Hash }
TSHA512Hash = class(AHash)
protected
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
procedure ProcessFinalBuf(const Buf; const BufSize: Integer; const TotalSize: Int64); override;
public
class function DigestSize: Integer; override;
class function BlockSize: Integer; override;
end;
{ TRipeMD160Hash }
TRipeMD160Hash = class(AHash)
protected
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
procedure ProcessFinalBuf(const Buf; const BufSize: Integer; const TotalSize: Int64); override;
public
class function DigestSize: Integer; override;
class function BlockSize: Integer; override;
end;
{ THMAC_MD5Hash }
THMAC_MD5Hash = class(AHash)
protected
FKey : T512BitBuf;
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
procedure ProcessFinalBuf(const Buf; const BufSize: Integer; const TotalSize: Int64); override;
public
class function DigestSize: Integer; override;
class function BlockSize: Integer; override;
destructor Destroy; override;
end;
{ THMAC_SHA1Hash }
THMAC_SHA1Hash = class(AHash)
protected
FKey : T512BitBuf;
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
procedure ProcessFinalBuf(const Buf; const BufSize: Integer; const TotalSize: Int64); override;
public
class function DigestSize: Integer; override;
class function BlockSize: Integer; override;
destructor Destroy; override;
end;
{ THMAC_SHA256Hash }
THMAC_SHA256Hash = class(AHash)
protected
FKey : T512BitBuf;
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
procedure ProcessFinalBuf(const Buf; const BufSize: Integer; const TotalSize: Int64); override;
public
class function DigestSize: Integer; override;
class function BlockSize: Integer; override;
destructor Destroy; override;
end;
{ THMAC_SHA512Hash }
THMAC_SHA512Hash = class(AHash)
protected
FKey : T1024BitBuf;
procedure InitHash(const Digest: Pointer; const Key: Pointer; const KeySize: Integer); override;
procedure ProcessBuf(const Buf; const BufSize: Integer); override;
procedure ProcessFinalBuf(const Buf; const BufSize: Integer; const TotalSize: Int64); override;
public
class function DigestSize: Integer; override;
class function BlockSize: Integer; override;
destructor Destroy; override;
end;
{ }
{ THashType }
{ }
type
THashType = (
hashChecksum32, hashXOR8, hashXOR16, hashXOR32,
hashCRC16, hashCRC32,
hashAdler32,
hashELF,
hashMD5, hashSHA1, hashSHA256, hashSHA512, hashRipeMD160,
hashHMAC_MD5, hashHMAC_SHA1, hashHMAC_SHA256, hashHMAC_SHA512);
{ }
{ GetHashClassByType }
{ }
function GetHashClassByType(const HashType: THashType): THashClass;
function GetDigestSize(const HashType: THashType): Integer;
{ }
{ CalculateHash }
{ }
procedure CalculateHash(const HashType: THashType;
const Buf; const BufSize: Integer; const Digest: Pointer;
const Key: Pointer = nil; const KeySize: Integer = 0); overload;
procedure CalculateHash(const HashType: THashType;
const Buf; const BufSize: Integer;
const Digest: Pointer; const Key: RawByteString = ''); overload;
procedure CalculateHash(const HashType: THashType;
const Buf: RawByteString; const Digest: Pointer;
const Key: RawByteString = ''); overload;
{ }
{ HashString }
{ }
{ HashString is a fast general purpose ASCII string hashing function. }
{ It returns a 32 bit value in the range 0 to Slots - 1. If Slots = 0 then }
{ the full 32 bit value is returned. }
{ If CaseSensitive = False then HashString will return the same hash value }
{ regardless of the case of the characters in the string. }
{ }
{ The implementation is based on CRC32. It uses up to 48 characters from }
{ the string (first 16 characters, last 16 characters and 16 characters }
{ uniformly sampled from the remaining characters) to calculate the hash }
{ value. }
{ }
function HashString(const StrBuf: Pointer; const StrLength: Integer;
const Slots: LongWord = 0; const CaseSensitive: Boolean = True): LongWord; overload;
function HashString(const S: RawByteString; const Slots: LongWord = 0;
const CaseSensitive: Boolean = True): LongWord; overload;
{ }
{ Self testing code }
{ }
{$IFDEF HASH_TEST}
procedure Test;
{$ENDIF}
implementation
uses
{$IFDEF MSWIN}
Windows
{$ENDIF}
{$IFDEF UNIX}
{$IFDEF FREEPASCAL}
BaseUnix,
Unix
{$ELSE}
libc,
BaseUnix
{$ENDIF}
{$ENDIF};
{ }
{ Hash errors }
{ }
const
hashErrorMessages : array[0..hashMAX_ERROR] of String = (
'',
'Internal error',
'Invalid hash type',
'Invalid buffer',
'Invalid buffer size',
'Invalid digest',
'Invalid key',
'Invalid file name',
'File open error',
'File seek error',
'File read error',
'Not a keyed hash type',
'Too many open handles',
'Invalid handle');
function GetHashErrorMessage(const ErrorCode: LongWord): PChar;
begin
if (ErrorCode = hashNoError) or (ErrorCode > hashMAX_ERROR) then
Result := nil
else
Result := PChar(hashErrorMessages[ErrorCode]);
end;
{ }
{ EHashError }
{ }
constructor EHashError.Create(const ErrorCode: LongWord; const Msg: String);
begin
FErrorCode := ErrorCode;
if (Msg = '') and (ErrorCode <= hashMAX_ERROR) then
inherited Create(hashErrorMessages[ErrorCode])
else
inherited Create(Msg);
end;
{ }
{ String internals functions }
{ }
{$IFNDEF SupportStringRefCount}