llcipher.h

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#ifndef LLCIPHER_H
#define LLCIPHER_H

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLCipher
//
// Abstract base class for a cipher object.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

class LLCipher
{
public:
        virtual ~LLCipher() {}

        // encrypt src and place result into dst. returns TRUE if
        // Returns number of bytes written into dst, or 0 on error.
        virtual U32 encrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len) = 0;

        // decrypt src and place result into dst. 
        // Returns number of bytes written into dst, or 0 on error.
        virtual U32 decrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len) = 0;

        // returns the minimum amount of space required to encrypt for a 
        // unencrypted source buffer of length len.
        // *NOTE: This is estimated space and you should check the return value
        // of the encrypt function.
        virtual U32 requiredEncryptionSpace(U32 src_len) const = 0 ;
};

#endif

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