Am liebsten wäre mir zwei einfach Funktionen, die ich in mein Project einbinden kann. Wenn jemand etwas hat oder sich damit schon auseinander gesetzt hat, wäre ich über Infos sehr dankbar.

Das einfach einbinden, den Rest dürfte man erkennen

Im Zweifelsfall bitte auch folgende Hinweise beachten:
C/C++ Forum :: FAQ - Sonstiges :: Wohin mit meiner Frage?

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Das einbinden dürfte ich schon hin bekommen, allerdings happerts dann ein bischen an der Umsetzung und dem Aufruf.
Den Sourcecode hatte ich auch schon in der Hand, allerdings bekomm ich ja nicht immer Strings wo die Länge durch 8 teilbar ist, was ist dann zu tun? Restlicher Speicher mit 0en füllen?
Bin noch eher der Anfänger in C deswegen wäre ein Beispiel schon recht nützlich.

Hi,

das hat eiugentlich nichts mit dem Programmieren (oder gar der Sprache) zu tun, sondern hier benötigst Du Padding.

Prinzipiell gibt es verschiedene Verfahren und gehört ebenso wie der Algorithmus (hier blowfish) und der Betriebsmodus zum Protokoll, auf das sich die Kommunikationspartner einigen müssen.

Beim Padding sind die beiden wohl berühmtesten Vertreter das "ZeroPadding" (einfach Nullen + 1 (Halb-)Byte Länge der Paddingdaten anhängen [ "Simon\x00\x00\x02" ] ) und das Randompadding (genauso aber mit Zufallszahlen statt Nullen).
Bei "Klartext" braucht man bisweilen nicht einmal die Länge ...
Aber da gibt es noch viiiel mehr (z.B. ISO9796-2).

Gruß,

Simon2.

eigentlich wollte ich den Code noch auf meiner Homepage veröffentlichen, aber ich stell den erstmal hier rein:

Erstmal brauchst du natürlich die nötigen Funktionsdefinitionen der Blowfish - Verschlüsselung damit du diese zum Ver und - entschlüsseln verwenden kannst. Das heist im Klartext, der Code des Blowfish ist in eine Header und C++ Datei verpackt. Diesen Code kannst du dann in dein Projekt einbinden, und dann die benötigten Verschlüsselungsfunktionen anwenden.

Hier erstmal der erste Codeteil des Blowfish's, es ist ein Header:

#ifndef __BLOWFISH_H__
#define __BLOWFISH_H__

struct SBlock
{
	SBlock(unsigned int l=0, unsigned int r=0) : m_uil(l), m_uir(r) {}
	SBlock(const SBlock& roBlock) : m_uil(roBlock.m_uil), m_uir(roBlock.m_uir) {}
	SBlock& operator^=(SBlock& b) { m_uil ^= b.m_uil; m_uir ^= b.m_uir; return *this; }
	unsigned int m_uil, m_uir;
};

class CBlowFish
{
public:
	enum { ECB=0, CBC=1, CFB=2 };
	CBlowFish(unsigned char* ucKey, size_t n, const SBlock& roChain = SBlock(0UL,0UL));
	void ResetChain() { m_oChain = m_oChain0; }
	void Encrypt(unsigned char* buf, size_t n, int iMode=ECB);
	void Decrypt(unsigned char* buf, size_t n, int iMode=ECB);
	void Encrypt(const unsigned char* in, unsigned char* out, size_t n, int iMode=ECB);
	void Decrypt(const unsigned char* in, unsigned char* out, size_t n, int iMode=ECB);
private:
	unsigned int F(unsigned int ui);
	void Encrypt(SBlock&);
	void Decrypt(SBlock&);

private:
	SBlock m_oChain0;
	SBlock m_oChain;
	unsigned int m_auiP[18];
	unsigned int m_auiS[4][256];
	static const unsigned int scm_auiInitP[18];
	static const unsigned int scm_auiInitS[4][256];
};

inline unsigned char Byte(unsigned int ui)
{
	return (unsigned char)(ui & 0xff);
}

inline unsigned int CBlowFish::F(unsigned int ui)
{
	return ((m_auiS[0][Byte(ui>>24)] + m_auiS[1][Byte(ui>>16)]) ^ m_auiS[2][Byte(ui>>8)]) + m_auiS[3][Byte(ui)];
}

#endif

Nun kommt die C++ Datei:

////////////////////////////////////////////////////////////////////////////
///
// BlowFish.cpp
//
//    Implementation of Bruce Schneier's BLOWFISH algorithm from "Applied 
//    Cryptography", Second Edition.

#include <cstring>
#include <exception>
#include "Blowfish.h"

//Initialization with a fixed string which consists of the hexadecimal digits of PI (less the initial 3)
//P-array, 18 32-bit subkeys
const unsigned int CBlowFish::scm_auiInitP[18] = {
	0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344,
	0xa4093822, 0x299f31d0, 0x082efa98, 0xec4e6c89,
	0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c,
	0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917,
	0x9216d5d9, 0x8979fb1b
};

//Four 32-bit S-boxes with 256 entries each
const unsigned int CBlowFish::scm_auiInitS[4][256] = {
	//0
	{0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7,
	 0xb8e1afed, 0x6a267e96, 0xba7c9045, 0xf12c7f99,
	 0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16,
	 0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e,
	 0x0d95748f, 0x728eb658, 0x718bcd58, 0x82154aee,
	 0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013,
	 0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef,
	 0x8e79dcb0, 0x603a180e, 0x6c9e0e8b, 0xb01e8a3e,
	 0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60,
	 0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440,
	 0x55ca396a, 0x2aab10b6, 0xb4cc5c34, 0x1141e8ce,
	 0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a,
	 0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e,
	 0xafd6ba33, 0x6c24cf5c, 0x7a325381, 0x28958677,
	 0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193,
	 0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032,
	 0xef845d5d, 0xe98575b1, 0xdc262302, 0xeb651b88,
	 0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239,
	 0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e,
	 0x21c66842, 0xf6e96c9a, 0x670c9c61, 0xabd388f0,
	 0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3,
	 0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98,
	 0xa1f1651d, 0x39af0176, 0x66ca593e, 0x82430e88,
	 0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe,
	 0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6,
	 0x4ed3aa62, 0x363f7706, 0x1bfedf72, 0x429b023d,
	 0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b,
	 0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7,
	 0xe3fe501a, 0xb6794c3b, 0x976ce0bd, 0x04c006ba,
	 0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463,
	 0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f,
	 0x6dfc511f, 0x9b30952c, 0xcc814544, 0xaf5ebd09,
	 0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3,
	 0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb,
	 0x5579c0bd, 0x1a60320a, 0xd6a100c6, 0x402c7279,
	 0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8,
	 0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab,
	 0x323db5fa, 0xfd238760, 0x53317b48, 0x3e00df82,
	 0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db,
	 0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573,
	 0x695b27b0, 0xbbca58c8, 0xe1ffa35d, 0xb8f011a0,
	 0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b,
	 0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790,
	 0xe1ddf2da, 0xa4cb7e33, 0x62fb1341, 0xcee4c6e8,
	 0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4,
	 0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0,
	 0xd08ed1d0, 0xafc725e0, 0x8e3c5b2f, 0x8e7594b7,
	 0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c,
	 0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad,
	 0x2f2f2218, 0xbe0e1777, 0xea752dfe, 0x8b021fa1,
	 0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299,
	 0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9,
	 0x165fa266, 0x80957705, 0x93cc7314, 0x211a1477,
	 0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf,
	 0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49,
	 0x00250e2d, 0x2071b35e, 0x226800bb, 0x57b8e0af,
	 0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa,
	 0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5,
	 0x83260376, 0x6295cfa9, 0x11c81968, 0x4e734a41,
	 0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915,
	 0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400,
	 0x08ba6fb5, 0x571be91f, 0xf296ec6b, 0x2a0dd915,
	 0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664,
	 0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a},

	//1
	{0x4b7a70e9, 0xb5b32944, 0xdb75092e, 0xc4192623,
	 0xad6ea6b0, 0x49a7df7d, 0x9cee60b8, 0x8fedb266,
	 0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1,
	 0x193602a5, 0x75094c29, 0xa0591340, 0xe4183a3e,
	 0x3f54989a, 0x5b429d65, 0x6b8fe4d6, 0x99f73fd6,
	 0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1,
	 0x4cdd2086, 0x8470eb26, 0x6382e9c6, 0x021ecc5e,
	 0x09686b3f, 0x3ebaefc9, 0x3c971814, 0x6b6a70a1,
	 0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737,
	 0x3e07841c, 0x7fdeae5c, 0x8e7d44ec, 0x5716f2b8,
	 0xb03ada37, 0xf0500c0d, 0xf01c1f04, 0x0200b3ff,
	 0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd,
	 0xd19113f9, 0x7ca92ff6, 0x94324773, 0x22f54701,
	 0x3ae5e581, 0x37c2dadc, 0xc8b57634, 0x9af3dda7,
	 0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41,
	 0xe238cd99, 0x3bea0e2f, 0x3280bba1, 0x183eb331,
	 0x4e548b38, 0x4f6db908, 0x6f420d03, 0xf60a04bf,
	 0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af,
	 0xde9a771f, 0xd9930810, 0xb38bae12, 0xdccf3f2e,
	 0x5512721f, 0x2e6b7124, 0x501adde6, 0x9f84cd87,
	 0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c,
	 0xec7aec3a, 0xdb851dfa, 0x63094366, 0xc464c3d2,
	 0xef1c1847, 0x3215d908, 0xdd433b37, 0x24c2ba16,
	 0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd,
	 0x71dff89e, 0x10314e55, 0x81ac77d6, 0x5f11199b,
	 0x043556f1, 0xd7a3c76b, 0x3c11183b, 0x5924a509,
	 0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e,
	 0x86e34570, 0xeae96fb1, 0x860e5e0a, 0x5a3e2ab3,
	 0x771fe71c, 0x4e3d06fa, 0x2965dcb9, 0x99e71d0f,
	 0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a,
	 0xc6150eba, 0x94e2ea78, 0xa5fc3c53, 0x1e0a2df4,
	 0xf2f74ea7, 0x361d2b3d, 0x1939260f, 0x19c27960,
	 0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66,
	 0xe3bc4595, 0xa67bc883, 0xb17f37d1, 0x018cff28,
	 0xc332ddef, 0xbe6c5aa5, 0x65582185, 0x68ab9802,
	 0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84,
	 0x1521b628, 0x29076170, 0xecdd4775, 0x619f1510,
	 0x13cca830, 0xeb61bd96, 0x0334fe1e, 0xaa0363cf,
	 0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14,
	 0xeecc86bc, 0x60622ca7, 0x9cab5cab, 0xb2f3846e,
	 0x648b1eaf, 0x19bdf0ca, 0xa02369b9, 0x655abb50,
	 0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7,
	 0x9b540b19, 0x875fa099, 0x95f7997e, 0x623d7da8,
	 0xf837889a, 0x97e32d77, 0x11ed935f, 0x16681281,
	 0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99,
	 0x57f584a5, 0x1b227263, 0x9b83c3ff, 0x1ac24696,
	 0xcdb30aeb, 0x532e3054, 0x8fd948e4, 0x6dbc3128,
	 0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73,
	 0x5d4a14d9, 0xe864b7e3, 0x42105d14, 0x203e13e0,
	 0x45eee2b6, 0xa3aaabea, 0xdb6c4f15, 0xfacb4fd0,
	 0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105,
	 0xd81e799e, 0x86854dc7, 0xe44b476a, 0x3d816250,
	 0xcf62a1f2, 0x5b8d2646, 0xfc8883a0, 0xc1c7b6a3,
	 0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285,
	 0x095bbf00, 0xad19489d, 0x1462b174, 0x23820e00,
	 0x58428d2a, 0x0c55f5ea, 0x1dadf43e, 0x233f7061,
	 0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb,
	 0x7cde3759, 0xcbee7460, 0x4085f2a7, 0xce77326e,
	 0xa6078084, 0x19f8509e, 0xe8efd855, 0x61d99735,
	 0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc,
	 0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9,
	 0xdb73dbd3, 0x105588cd, 0x675fda79, 0xe3674340,
	 0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20,
	 0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7},

	//2
	{0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934,
	 0x411520f7, 0x7602d4f7, 0xbcf46b2e, 0xd4a20068,
	 0xd4082471, 0x3320f46a, 0x43b7d4b7, 0x500061af,
	 0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840,
	 0x4d95fc1d, 0x96b591af, 0x70f4ddd3, 0x66a02f45,
	 0xbfbc09ec, 0x03bd9785, 0x7fac6dd0, 0x31cb8504,
	 0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a,
	 0x28507825, 0x530429f4, 0x0a2c86da, 0xe9b66dfb,
	 0x68dc1462, 0xd7486900, 0x680ec0a4, 0x27a18dee,
	 0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6,
	 0xaace1e7c, 0xd3375fec, 0xce78a399, 0x406b2a42,
	 0x20fe9e35, 0xd9f385b9, 0xee39d7ab, 0x3b124e8b,
	 0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2,
	 0x3a6efa74, 0xdd5b4332, 0x6841e7f7, 0xca7820fb,
	 0xfb0af54e, 0xd8feb397, 0x454056ac, 0xba489527,
	 0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b,
	 0x55a867bc, 0xa1159a58, 0xcca92963, 0x99e1db33,
	 0xa62a4a56, 0x3f3125f9, 0x5ef47e1c, 0x9029317c,
	 0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3,
	 0x95c11548, 0xe4c66d22, 0x48c1133f, 0xc70f86dc,
	 0x07f9c9ee, 0x41041f0f, 0x404779a4, 0x5d886e17,
	 0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564,
	 0x257b7834, 0x602a9c60, 0xdff8e8a3, 0x1f636c1b,
	 0x0e12b4c2, 0x02e1329e, 0xaf664fd1, 0xcad18115,
	 0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922,
	 0x85b2a20e, 0xe6ba0d99, 0xde720c8c, 0x2da2f728,
	 0xd0127845, 0x95b794fd, 0x647d0862, 0xe7ccf5f0,
	 0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e,
	 0x0a476341, 0x992eff74, 0x3a6f6eab, 0xf4f8fd37,
	 0xa812dc60, 0xa1ebddf8, 0x991be14c, 0xdb6e6b0d,
	 0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804,
	 0xf1290dc7, 0xcc00ffa3, 0xb5390f92, 0x690fed0b,
	 0x667b9ffb, 0xcedb7d9c, 0xa091cf0b, 0xd9155ea3,
	 0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb,
	 0x37392eb3, 0xcc115979, 0x8026e297, 0xf42e312d,
	 0x6842ada7, 0xc66a2b3b, 0x12754ccc, 0x782ef11c,
	 0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350,
	 0x1a6b1018, 0x11caedfa, 0x3d25bdd8, 0xe2e1c3c9,
	 0x44421659, 0x0a121386, 0xd90cec6e, 0xd5abea2a,
	 0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe,
	 0x9dbc8057, 0xf0f7c086, 0x60787bf8, 0x6003604d,
	 0xd1fd8346, 0xf6381fb0, 0x7745ae04, 0xd736fccc,
	 0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f,
	 0x77a057be, 0xbde8ae24, 0x55464299, 0xbf582e61,
	 0x4e58f48f, 0xf2ddfda2, 0xf474ef38, 0x8789bdc2,
	 0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9,
	 0x7aeb2661, 0x8b1ddf84, 0x846a0e79, 0x915f95e2,
	 0x466e598e, 0x20b45770, 0x8cd55591, 0xc902de4c,
	 0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e,
	 0xb77f19b6, 0xe0a9dc09, 0x662d09a1, 0xc4324633,
	 0xe85a1f02, 0x09f0be8c, 0x4a99a025, 0x1d6efe10,
	 0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169,
	 0xdcb7da83, 0x573906fe, 0xa1e2ce9b, 0x4fcd7f52,
	 0x50115e01, 0xa70683fa, 0xa002b5c4, 0x0de6d027,
	 0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5,
	 0xf0177a28, 0xc0f586e0, 0x006058aa, 0x30dc7d62,
	 0x11e69ed7, 0x2338ea63, 0x53c2dd94, 0xc2c21634,
	 0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76,
	 0x6f05e409, 0x4b7c0188, 0x39720a3d, 0x7c927c24,
	 0x86e3725f, 0x724d9db9, 0x1ac15bb4, 0xd39eb8fc,
	 0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4,
	 0x1e50ef5e, 0xb161e6f8, 0xa28514d9, 0x6c51133c,
	 0x6fd5c7e7, 0x56e14ec4, 0x362abfce, 0xddc6c837,
	 0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0},

	//3
	{0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b,
	 0x5cb0679e, 0x4fa33742, 0xd3822740, 0x99bc9bbe,
	 0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b,
	 0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4,
	 0x5748ab2f, 0xbc946e79, 0xc6a376d2, 0x6549c2c8,
	 0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6,
	 0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304,
	 0xa1fad5f0, 0x6a2d519a, 0x63ef8ce2, 0x9a86ee22,
	 0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4,
	 0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6,
	 0x2826a2f9, 0xa73a3ae1, 0x4ba99586, 0xef5562e9,
	 0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59,
	 0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593,
	 0xe990fd5a, 0x9e34d797, 0x2cf0b7d9, 0x022b8b51,
	 0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28,
	 0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c,
	 0xe029ac71, 0xe019a5e6, 0x47b0acfd, 0xed93fa9b,
	 0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28,
	 0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c,
	 0x15056dd4, 0x88f46dba, 0x03a16125, 0x0564f0bd,
	 0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a,
	 0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319,
	 0x7533d928, 0xb155fdf5, 0x03563482, 0x8aba3cbb,
	 0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f,
	 0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991,
	 0xea7a90c2, 0xfb3e7bce, 0x5121ce64, 0x774fbe32,
	 0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680,
	 0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166,
	 0xb39a460a, 0x6445c0dd, 0x586cdecf, 0x1c20c8ae,
	 0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb,
	 0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5,
	 0x72eacea8, 0xfa6484bb, 0x8d6612ae, 0xbf3c6f47,
	 0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370,
	 0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d,
	 0x4040cb08, 0x4eb4e2cc, 0x34d2466a, 0x0115af84,
	 0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048,
	 0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8,
	 0x611560b1, 0xe7933fdc, 0xbb3a792b, 0x344525bd,
	 0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9,
	 0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7,
	 0x1a908749, 0xd44fbd9a, 0xd0dadecb, 0xd50ada38,
	 0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f,
	 0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c,
	 0xbf97222c, 0x15e6fc2a, 0x0f91fc71, 0x9b941525,
	 0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1,
	 0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442,
	 0xe0ec6e0e, 0x1698db3b, 0x4c98a0be, 0x3278e964,
	 0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e,
	 0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8,
	 0xdf359f8d, 0x9b992f2e, 0xe60b6f47, 0x0fe3f11d,
	 0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f,
	 0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299,
	 0xf523f357, 0xa6327623, 0x93a83531, 0x56cccd02,
	 0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc,
	 0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614,
	 0xe6c6c7bd, 0x327a140a, 0x45e1d006, 0xc3f27b9a,
	 0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6,
	 0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b,
	 0x53113ec0, 0x1640e3d3, 0x38abbd60, 0x2547adf0,
	 0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060,
	 0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e,
	 0x1948c25c, 0x02fb8a8c, 0x01c36ae4, 0xd6ebe1f9,
	 0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f,
	 0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6}
};

//Constructor - Initialize the P and S boxes for a given Key
CBlowFish::CBlowFish(unsigned char* ucKey, size_t keysize, const SBlock& roChain) : m_oChain0(roChain), m_oChain(roChain)
{
	if(keysize<1)
		throw ("Incorrect key length");
	//Check the Key - the key length should be between 1 and 56 bytes
	if(keysize>56)
		keysize = 56;
	unsigned char aucLocalKey[56];
	unsigned int i, j;
	memcpy(aucLocalKey, ucKey, keysize);
	//Reflexive Initialization of the Blowfish.
	//Generating the Subkeys from the Key flood P and S boxes with PI
	memcpy(m_auiP, scm_auiInitP, sizeof m_auiP);
	memcpy(m_auiS, scm_auiInitS, sizeof m_auiS);
	//Load P boxes with key bytes
	const unsigned char* p = aucLocalKey;
	unsigned int x=0;
	//Repeatedly cycle through the key bits until the entire P array has been XORed with key bits
	int iCount = 0;
	for(i=0; i<18; i++)
	{
		x=0;
		for(int n=4; n--; )
		{
			int iVal = (int)(*p);
			x <<= 8;
			x |= *(p++);
			iCount++;
			if(iCount == keysize)
			{
				//All bytes used, so recycle bytes 
				iCount = 0;
				p = aucLocalKey;
			}
		}
		m_auiP[i] ^= x;
	}
	//Reflect P and S boxes through the evolving Blowfish
	SBlock block(0UL,0UL); //all-zero block
	for(i=0; i<18; )
		Encrypt(block), m_auiP[i++] = block.m_uil, m_auiP[i++] = block.m_uir;
	for(j=0; j<4; j++)
		for(int k=0; k<256; )
			Encrypt(block), m_auiS[j][k++] = block.m_uil, m_auiS[j][k++] = block.m_uir;
}

//Sixteen Round Encipher of Block
void CBlowFish::Encrypt(SBlock& block)
{
	unsigned int uiLeft = block.m_uil;
	unsigned int uiRight = block.m_uir;
	uiLeft ^= m_auiP[0];
	uiRight ^= F(uiLeft)^m_auiP[1]; uiLeft ^= F(uiRight)^m_auiP[2];
	uiRight ^= F(uiLeft)^m_auiP[3]; uiLeft ^= F(uiRight)^m_auiP[4];
	uiRight ^= F(uiLeft)^m_auiP[5]; uiLeft ^= F(uiRight)^m_auiP[6];
	uiRight ^= F(uiLeft)^m_auiP[7]; uiLeft ^= F(uiRight)^m_auiP[8];
	uiRight ^= F(uiLeft)^m_auiP[9]; uiLeft ^= F(uiRight)^m_auiP[10];
	uiRight ^= F(uiLeft)^m_auiP[11]; uiLeft ^= F(uiRight)^m_auiP[12];
	uiRight ^= F(uiLeft)^m_auiP[13]; uiLeft ^= F(uiRight)^m_auiP[14];
	uiRight ^= F(uiLeft)^m_auiP[15]; uiLeft ^= F(uiRight)^m_auiP[16];
	uiRight ^= m_auiP[17];
	block.m_uil = uiRight;
	block.m_uir = uiLeft;
}

//Sixteen Round Decipher of SBlock
void CBlowFish::Decrypt(SBlock& block)
{
	unsigned int uiLeft = block.m_uil;
	unsigned int uiRight = block.m_uir;
	uiLeft ^= m_auiP[17];
	uiRight ^= F(uiLeft)^m_auiP[16]; uiLeft ^= F(uiRight)^m_auiP[15];
	uiRight ^= F(uiLeft)^m_auiP[14]; uiLeft ^= F(uiRight)^m_auiP[13];
	uiRight ^= F(uiLeft)^m_auiP[12]; uiLeft ^= F(uiRight)^m_auiP[11];
	uiRight ^= F(uiLeft)^m_auiP[10]; uiLeft ^= F(uiRight)^m_auiP[9];
	uiRight ^= F(uiLeft)^m_auiP[8]; uiLeft ^= F(uiRight)^m_auiP[7];
	uiRight ^= F(uiLeft)^m_auiP[6]; uiLeft ^= F(uiRight)^m_auiP[5];
	uiRight ^= F(uiLeft)^m_auiP[4]; uiLeft ^= F(uiRight)^m_auiP[3];
	uiRight ^= F(uiLeft)^m_auiP[2]; uiLeft ^= F(uiRight)^m_auiP[1];
	uiRight ^= m_auiP[0];
	block.m_uil = uiRight;
	block.m_uir = uiLeft;
}

//Semi-Portable Byte Shuffling
inline void BytesToBlock(unsigned char const* p, SBlock& b)
{
	unsigned int y;
	//Left
	b.m_uil = 0;
	y = *p++;
	y <<= 24;
	b.m_uil |= y;
	y = *p++;
	y <<= 16;
	b.m_uil |= y;
	y = *p++;
	y <<= 8;
	b.m_uil |= y;
	y = *p++;
	b.m_uil |= y;
	//Right
	b.m_uir = 0;
	y = *p++;
	y <<= 24;
	b.m_uir |= y;
	y = *p++;
	y <<= 16;
	b.m_uir |= y;
	y = *p++;
	y <<= 8;
	b.m_uir |= y;
	y = *p++;
	b.m_uir |= y;
}

inline void BlockToBytes(SBlock const& b, unsigned char* p)
{
	unsigned int y;
	//Right
	y = b.m_uir;
	*--p = Byte(y);
	y = b.m_uir >> 8;
	*--p = Byte(y);
	y = b.m_uir >> 16;
	*--p = Byte(y);
	y = b.m_uir >> 24;
	*--p = Byte(y);
	//Left
	y = b.m_uil;
	*--p = Byte(y);
	y = b.m_uil >> 8;
	*--p = Byte(y);
	y = b.m_uil >> 16;
	*--p = Byte(y);
	y = b.m_uil >> 24;
	*--p = Byte(y);
}

//Encrypt Buffer in Place
//Returns false if n is multiple of 8
void CBlowFish::Encrypt(unsigned char* buf, size_t n, int iMode)
{
	//Check the buffer's length - should be > 0 and multiple of 8
	if((n==0)||(n%8!=0))
		throw ("Incorrect buffer length");
	SBlock work;
	if(iMode == CBC) //CBC mode, using the Chain
	{
		SBlock chain(m_oChain);
		for(; n >= 8; n -= 8)
		{
			BytesToBlock(buf, work);
			work ^= chain;
			Encrypt(work);
			chain = work;
			BlockToBytes(work, buf+=8);
		}
	}
	else if(iMode == CFB) //CFB mode, using the Chain
	{
		SBlock chain(m_oChain);
		for(; n >= 8; n -= 8)
		{
			Encrypt(chain);
			BytesToBlock(buf, work);
			work ^= chain;
			chain = work;
			BlockToBytes(work, buf+=8);
		}
	}
	else //ECB mode, not using the Chain
	{
		for(; n >= 8; n -= 8)
		{
			BytesToBlock(buf, work);
			Encrypt(work);
			BlockToBytes(work, buf+=8);
		}
	}
}

//Decrypt Buffer in Place
//Returns false if n is multiple of 8
void CBlowFish::Decrypt(unsigned char* buf, size_t n, int iMode)
{
	//Check the buffer's length - should be > 0 and multiple of 8
	if((n==0)||(n%8!=0))
		throw ("Incorrect buffer length");
	SBlock work;
	if(iMode == CBC) //CBC mode, using the Chain
	{
		SBlock crypt, chain(m_oChain);
		for(; n >= 8; n -= 8)
		{
			BytesToBlock(buf, work);
			crypt = work;
			Decrypt(work);
			work ^= chain;
			chain = crypt;
			BlockToBytes(work, buf+=8);
		}
	}
	else if(iMode == CFB) //CFB mode, using the Chain, not using Decrypt()
	{
		SBlock crypt, chain(m_oChain);
		for(; n >= 8; n -= 8)
		{
			BytesToBlock(buf, work);
			Encrypt(chain);
			crypt = work;
			work ^= chain;
			chain = crypt;
			BlockToBytes(work, buf+=8);
		}
	}
	else //ECB mode, not using the Chain
	{
		for(; n >= 8; n -= 8)
		{
			BytesToBlock(buf, work);
			Decrypt(work);
			BlockToBytes(work, buf+=8);
		}
	}
}

//Encrypt from Input Buffer to Output Buffer
//Returns false if n is multiple of 8
void CBlowFish::Encrypt(const unsigned char* in, unsigned char* out, size_t n, int iMode)
{
	//Check the buffer's length - should be > 0 and multiple of 8
	if((n==0)||(n%8!=0))
		throw ("Incorrect buffer length");
	SBlock work;
	if(iMode == CBC) //CBC mode, using the Chain
	{
		SBlock chain(m_oChain);
		for(; n >= 8; n -= 8, in += 8)
		{
			BytesToBlock(in, work);
			work ^= chain;
			Encrypt(work);
			chain = work;
			BlockToBytes(work, out+=8);
		}
	}
	else if(iMode == CFB) //CFB mode, using the Chain
	{
		SBlock chain(m_oChain);
		for(; n >= 8; n -= 8, in += 8)
		{
			Encrypt(chain);
			BytesToBlock(in, work);
			work ^= chain;
			chain = work;
			BlockToBytes(work, out+=8);
		}
	}
	else //ECB mode, not using the Chain
	{
		for(; n >= 8; n -= 8, in += 8)
		{
			BytesToBlock(in, work);
			Encrypt(work);
			BlockToBytes(work, out+=8);
		}
	}
}

//Decrypt from Input Buffer to Output Buffer
//Returns false if n is multiple of 8
void CBlowFish::Decrypt(const unsigned char* in, unsigned char* out, size_t n, int iMode)
{
	//Check the buffer's length - should be > 0 and multiple of 8
	if((n==0)||(n%8!=0))
		throw ("Incorrect buffer length");
	SBlock work;
	if(iMode == CBC) //CBC mode, using the Chain
	{
		SBlock crypt, chain(m_oChain);
		for(; n >= 8; n -= 8, in += 8)
		{
			BytesToBlock(in, work);
			crypt = work;
			Decrypt(work);
			work ^= chain;
			chain = crypt;
			BlockToBytes(work, out+=8);
		}
	}
	else if(iMode == CFB) //CFB mode, using the Chain, not using Decrypt()
	{
		SBlock crypt, chain(m_oChain);
		for(; n >= 8; n -= 8, in += 8)
		{
			BytesToBlock(in, work);
			Encrypt(chain);
			crypt = work;
			work ^= chain;
			chain = crypt;
			BlockToBytes(work, out+=8);
		}
	}
	else //ECB mode, not using the Chain
	{
		for(; n >= 8; n -= 8, in += 8)
		{
			BytesToBlock(in, work);
			Decrypt(work);
			BlockToBytes(work, out+=8);
		}
	}
}

Jetzt kannst du die Funktionen anwenden, hier ein kleiner Beispielcode, er ist schön kommentiert:

#include <cstdlib>
#include <iostream>
#include "blowfish.h"

using namespace std;

int main(int argc, char *argv[])
{
  //Initialisierung (key, keylänge)
  CBlowFish BlowFish((unsigned char*)"cplusplus", 9);
  //Zu verschlüsselnder string
  string pwd = "mikey";
  //Schlüssellänge auf 16 Byte festlegen
  int keysize=16;
  //Verschlüsselten string anlegen 
  string cryptpwd;
  //und Platz für 16 Byte (keysize) reservieren
  cryptpwd.resize(keysize);
  //Verschlüsseln
  BlowFish.Encrypt((unsigned char*)pwd.c_str(), (unsigned char*)cryptpwd.c_str(), keysize); 
  //Verschlüsselten string ausgeben
  cout << cryptpwd;
  //Jetzt fürs Beispiel das gegebene Passwort löschen
  pwd.clear();
  //und die Länge des entschlüsselten Passwortes (pwd) reservieren.
  pwd.resize(6);
  //Entschlüsseln
  BlowFish.Decrypt((unsigned char*)cryptpwd.c_str(), (unsigned char*)pwd.c_str(), keysize);
  //Entschlüsselten string ausgeben
  cout << endl << pwd << endl;
  getchar ();
  return EXIT_SUCCESS;
}

Ich hoffe, ich konnte dir damit weiterhelfen

MfG mikey.

gcc -o blowfish_test blowfish_test.cpp

genommen und dabei kommen diese Fehler:

/tmp/ccbiesVs.o: In function `std::__verify_grouping(char const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
blowfish_test.cpp:(.text+0xd): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::size() const'
blowfish_test.cpp:(.text+0x60): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned int) const'
blowfish_test.cpp:(.text+0x9d): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned int) const'
blowfish_test.cpp:(.text+0xc8): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned int) const'
/tmp/ccbiesVs.o: In function `main':
blowfish_test.cpp:(.text+0x148): undefined reference to `CBlowFish::CBlowFish(unsigned char*, unsigned int, SBlock const&)'
blowfish_test.cpp:(.text+0x15d): undefined reference to `std::allocator<char>::allocator()'
blowfish_test.cpp:(.text+0x178): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)'
blowfish_test.cpp:(.text+0x198): undefined reference to `std::allocator<char>::~allocator()'
blowfish_test.cpp:(.text+0x1be): undefined reference to `std::allocator<char>::~allocator()'
blowfish_test.cpp:(.text+0x1da): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string()'
blowfish_test.cpp:(.text+0x1f2): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::resize(unsigned int)'
blowfish_test.cpp:(.text+0x20f): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::c_str() const'
blowfish_test.cpp:(.text+0x222): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::c_str() const'
blowfish_test.cpp:(.text+0x232): undefined reference to `CBlowFish::Encrypt(unsigned char const*, unsigned char*, unsigned int, int)'
blowfish_test.cpp:(.text+0x244): undefined reference to `std::cout'
blowfish_test.cpp:(.text+0x249): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <char, std::char_traits<char>, std::allocator<char> >(std::basic_ostream<char, std::char_traits<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
blowfish_test.cpp:(.text+0x25b): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::clear()'
blowfish_test.cpp:(.text+0x26f): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::resize(unsigned int)'
blowfish_test.cpp:(.text+0x28c): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::c_str() const'
blowfish_test.cpp:(.text+0x29f): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::c_str() const'
blowfish_test.cpp:(.text+0x2af): undefined reference to `CBlowFish::Decrypt(unsigned char const*, unsigned char*, unsigned int, int)'
blowfish_test.cpp:(.text+0x2ba): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
blowfish_test.cpp:(.text+0x2cc): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
blowfish_test.cpp:(.text+0x2d1): undefined reference to `std::cout'
blowfish_test.cpp:(.text+0x2d6): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))'
blowfish_test.cpp:(.text+0x2df): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <char, std::char_traits<char>, std::allocator<char> >(std::basic_ostream<char, std::char_traits<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
blowfish_test.cpp:(.text+0x2e8): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))'
blowfish_test.cpp:(.text+0x2ff): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
blowfish_test.cpp:(.text+0x311): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
blowfish_test.cpp:(.text+0x33b): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
blowfish_test.cpp:(.text+0x361): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
/tmp/ccbiesVs.o: In function `__static_initialization_and_destruction_0(int, int)':
blowfish_test.cpp:(.text+0x3a6): undefined reference to `std::ios_base::Init::Init()'
/tmp/ccbiesVs.o: In function `__tcf_0':
blowfish_test.cpp:(.text+0x3d5): undefined reference to `std::ios_base::Init::~Init()'
/tmp/ccbiesVs.o:(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

- Unter welchem OS arbeitest du (wenn überhaupt)
- Welche IDE benutzt du ? (Ich glaube mal Linux ?)

Bei dir sind es nur ein paar Einstellungsfehler, ansonsten sehe ich keine sonstigen Fehlermeldungen.

Sorry, aber damit habe ich zu wenig Erfahrung, bzw. garkeine. Linux dürfte dabei keine Rolle spielen, aber die Funktionensdefinitionen müssen dem Linker bekannt gemacht werden. Wie das in der Konsole geht weis ich leider nicht

Warte mal ein paar Stunden ab, bestimmt hilft dir da jemand weiter.

MfG mikey.

also ich benutze gar keine IDE sondern schreibe die Sachen in der Console. Das OS is gentoo Linux

Nimm den g++, der linkt die C++ Standard Bibliothek gleich mit...

Ich hoffe es gelingt dir !