source: tools/traceanon/Anon.h @ 10553bf

#ifndef WDCAP_ANON_H
#define WDCAP_ANON_H

#include "config.h"
#include <sys/types.h>
#include <inttypes.h>


class Anonymiser {
public:
    Anonymiser();
    virtual ~Anonymiser()  {};

    virtual uint32_t anonIPv4(uint32_t orig) = 0;
    virtual void anonIPv6(uint8_t *orig, uint8_t *result) = 0;

};

class PrefixSub: public Anonymiser {
public:
    PrefixSub(const char *ipv4_key, const char *ipv6_key);
    ~PrefixSub();
    uint32_t anonIPv4(uint32_t orig);
    void anonIPv6(uint8_t *orig, uint8_t *result);

private:
    uint32_t ipv4_prefix;
    uint32_t ipv4_mask;

    uint8_t ipv6_prefix[16];
    uint8_t ipv6_mask[16];

};

#ifdef HAVE_LIBCRYPTO
#include <openssl/evp.h>
#include <map>

typedef std::map<uint32_t, uint32_t> IPv4AnonCache;
typedef std::map<uint64_t, uint64_t> IPv6AnonCache;

class CryptoAnon : public Anonymiser {
public:
    CryptoAnon(uint8_t *key, uint8_t len, uint8_t cachebits);
    ~CryptoAnon();

    uint32_t anonIPv4(uint32_t orig);
    void anonIPv6(uint8_t *orig, uint8_t *result);


private:
    uint8_t padding[16];
    uint8_t key[16];
    uint8_t cachebits;

    IPv4AnonCache *ipv4_cache;
    IPv6AnonCache *ipv6_cache;

    uint32_t recent_ipv4_cache[2][2];
    const EVP_CIPHER *cipher;
    EVP_CIPHER_CTX ctx;

    uint32_t encrypt32Bits(uint32_t orig, uint8_t start, uint8_t stop,
            uint32_t res);
    uint64_t encrypt64Bits(uint64_t orig); 
    uint32_t lookupv4Cache(uint32_t prefix);
    uint64_t lookupv6Cache(uint64_t prefix);

};
#endif

#endif
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