noo/client/encryption.h

#ifndef ENCRYPTION_H
#define ENCRYPTION_H

#include <QByteArray>
#include "openssl/blowfish.h"
#include "openssl/sha.h"
#include "twofish.h"

class BlowfishCipher
{
protected:
    QByteArray mKey;
    QByteArray mIV;
    BF_KEY mContext;

public:
    BlowfishCipher();
    ~BlowfishCipher();
    void setKey(const QByteArray& ba);
    const QByteArray& key() const;
    void setIV(const QByteArray& ba);
    QByteArray& IV() const;

    void encrypt(const QByteArray& plain, QByteArray& encrypted);
    void decrypt(const QByteArray& encrypted, QByteArray& plain);
};

class TwofishCipher
{
protected:
    QByteArray mKey;
    QByteArray mIV;
    TwofishKey mKeyStruct;
    Twofish* mContext;

public:
    TwofishCipher();
    ~TwofishCipher();

    int blocksize() const { return 16; }
    void setKey(const QByteArray& ba);
    const QByteArray& key() const;

    // IV vector must be 16 bytes
    void setIV(const QByteArray& ba);
    const QByteArray& IV() const;

    // Plain and encrypted must be padded to 16 bytes boundary before call
    void encrypt(const QByteArray& plain, int plainOffset, QByteArray& encrypted, int encryptedOffset);
    void decrypt(const QByteArray& encrypted, int encryptedOffset, QByteArray& plain, int plainOffset);
};


class SHA256
{
protected:
    SHA256_CTX mContext;
    QByteArray mDigest;
public:
    SHA256();
    ~SHA256();

    QByteArray& digest();
    void update(const void* data, int length);
    void final();
};

class IV
{
public:
    static void Generate(QByteArray& buffer);
};

#endif // ENCRYPTION_H