I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#ifndef IDENTITY_H__
#define IDENTITY_H__
#include <inttypes.h>
#include <string.h>
#include <string>
#include "base64.h"
#include "ElGamal.h"
#include "Signature.h"
namespace i2p
{
namespace data
{
template<int sz>
class Tag
{
public:
Tag (const uint8_t * buf) { memcpy (m_Buf, buf, sz); };
Tag (const Tag<sz>& ) = default;
#ifndef _WIN32 // FIXME!!! msvs 2013 can't compile it
Tag (Tag<sz>&& ) = default;
#endif
Tag () = default;
Tag<sz>& operator= (const Tag<sz>& ) = default;
#ifndef _WIN32
Tag<sz>& operator= (Tag<sz>&& ) = default;
#endif
uint8_t * operator()() { return m_Buf; };
const uint8_t * operator()() const { return m_Buf; };
operator uint8_t * () { return m_Buf; };
operator const uint8_t * () const { return m_Buf; };
const uint64_t * GetLL () const { return ll; };
bool operator== (const Tag<sz>& other) const { return !memcmp (m_Buf, other.m_Buf, sz); };
bool operator< (const Tag<sz>& other) const { return memcmp (m_Buf, other.m_Buf, sz) < 0; };
std::string ToBase64 () const
{
char str[sz*2];
int l = i2p::data::ByteStreamToBase64 (m_Buf, sz, str, sz*2);
str[l] = 0;
return std::string (str);
}
std::string ToBase32 () const
{
char str[sz*2];
int l = i2p::data::ByteStreamToBase32 (m_Buf, sz, str, sz*2);
str[l] = 0;
return std::string (str);
}
private:
union // 8 bytes alignment
{
uint8_t m_Buf[sz];
uint64_t ll[sz/8];
};
};
typedef Tag<32> IdentHash;
#pragma pack(1)
struct DHKeysPair // transient keys for transport sessions
{
uint8_t publicKey[256];
uint8_t privateKey[256];
};
struct Keys
{
uint8_t privateKey[256];
uint8_t signingPrivateKey[20];
uint8_t publicKey[256];
uint8_t signingKey[128];
};
const uint8_t CERTIFICATE_TYPE_NULL = 0;
const uint8_t CERTIFICATE_TYPE_HASHCASH = 1;
const uint8_t CERTIFICATE_TYPE_HIDDEN = 2;
const uint8_t CERTIFICATE_TYPE_SIGNED = 3;
const uint8_t CERTIFICATE_TYPE_MULTIPLE = 4;
const uint8_t CERTIFICATE_TYPE_KEY = 5;
struct Identity
{
uint8_t publicKey[256];
uint8_t signingKey[128];
struct
{
uint8_t type;
uint16_t length;
} certificate;
Identity () = default;
Identity (const Keys& keys) { *this = keys; };
Identity& operator=(const Keys& keys);
size_t FromBuffer (const uint8_t * buf, size_t len);
IdentHash Hash () const;
};
const size_t DEFAULT_IDENTITY_SIZE = sizeof (Identity); // 387 bytes
const uint16_t CRYPTO_KEY_TYPE_ELGAMAL = 0;
const uint16_t SIGNING_KEY_TYPE_DSA_SHA1 = 0;
const uint16_t SIGNING_KEY_TYPE_ECDSA_SHA256_P256 = 1;
typedef uint16_t SigningKeyType;
class IdentityEx
{
public:
IdentityEx ();
IdentityEx (const uint8_t * publicKey, const uint8_t * signingKey,
SigningKeyType type = SIGNING_KEY_TYPE_DSA_SHA1);
IdentityEx (const uint8_t * buf, size_t len);
IdentityEx (const IdentityEx& other);
~IdentityEx ();
IdentityEx& operator=(const IdentityEx& other);
IdentityEx& operator=(const Identity& standard);
size_t FromBase64(const std::string& s);
size_t FromBuffer (const uint8_t * buf, size_t len);
size_t ToBuffer (uint8_t * buf, size_t len) const;
const Identity& GetStandardIdentity () const { return m_StandardIdentity; };
const IdentHash& GetIdentHash () const { return m_IdentHash; };
size_t GetFullLen () const { return m_ExtendedLen + DEFAULT_IDENTITY_SIZE; };
size_t GetSigningPublicKeyLen () const;
size_t GetSignatureLen () const;
bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const;
SigningKeyType GetSigningKeyType () const;
private:
void CreateVerifier ();
private:
Identity m_StandardIdentity;
IdentHash m_IdentHash;
i2p::crypto::Verifier * m_Verifier;
size_t m_ExtendedLen;
uint8_t * m_ExtendedBuffer;
};
class PrivateKeys // for eepsites
{
public:
PrivateKeys (): m_Signer (nullptr) {};
PrivateKeys (const PrivateKeys& other): m_Signer (nullptr) { *this = other; };
PrivateKeys (const Keys& keys): m_Signer (nullptr) { *this = keys; };
PrivateKeys& operator=(const Keys& keys);
PrivateKeys& operator=(const PrivateKeys& other);
~PrivateKeys () { delete m_Signer; };
const IdentityEx& GetPublic () const { return m_Public; };
const uint8_t * GetPrivateKey () const { return m_PrivateKey; };
const uint8_t * GetSigningPrivateKey () const { return m_SigningPrivateKey; };
void Sign (const uint8_t * buf, int len, uint8_t * signature) const;
size_t GetFullLen () const { return m_Public.GetFullLen () + 256 + m_Public.GetSignatureLen ()/2; };
size_t FromBuffer (const uint8_t * buf, size_t len);
size_t ToBuffer (uint8_t * buf, size_t len) const;
static PrivateKeys CreateRandomKeys (SigningKeyType type = SIGNING_KEY_TYPE_DSA_SHA1);
private:
void CreateSigner ();
private:
IdentityEx m_Public;
uint8_t m_PrivateKey[256];
uint8_t m_SigningPrivateKey[128]; // assume private key doesn't exceed 128 bytes
i2p::crypto::Signer * m_Signer;
};
#pragma pack()
Keys CreateRandomKeys ();
void CreateRandomDHKeysPair (DHKeysPair * keys); // for transport sessions
// kademlia
struct XORMetric
{
union
{
uint8_t metric[32];
uint64_t metric_ll[4];
};
void SetMin () { memset (metric, 0, 32); };
void SetMax () { memset (metric, 0xFF, 32); };
bool operator< (const XORMetric& other) const { return memcmp (metric, other.metric, 32) < 0; };
};
IdentHash CreateRoutingKey (const IdentHash& ident);
XORMetric operator^(const IdentHash& key1, const IdentHash& key2);
// destination for delivery instuctions
class RoutingDestination
{
public:
RoutingDestination (): m_ElGamalEncryption (nullptr) {};
virtual ~RoutingDestination () { delete m_ElGamalEncryption; };
virtual const IdentHash& GetIdentHash () const = 0;
virtual const uint8_t * GetEncryptionPublicKey () const = 0;
virtual bool IsDestination () const = 0; // for garlic
i2p::crypto::ElGamalEncryption * GetElGamalEncryption () const
{
if (!m_ElGamalEncryption)
m_ElGamalEncryption = new i2p::crypto::ElGamalEncryption (GetEncryptionPublicKey ());
return m_ElGamalEncryption;
}
private:
mutable i2p::crypto::ElGamalEncryption * m_ElGamalEncryption; // use lazy initialization
};
class LocalDestination
{
public:
virtual ~LocalDestination() {};
virtual const PrivateKeys& GetPrivateKeys () const = 0;
virtual const uint8_t * GetEncryptionPrivateKey () const = 0;
virtual const uint8_t * GetEncryptionPublicKey () const = 0;
const IdentityEx& GetIdentity () const { return GetPrivateKeys ().GetPublic (); };
const IdentHash& GetIdentHash () const { return GetIdentity ().GetIdentHash (); };
void Sign (const uint8_t * buf, int len, uint8_t * signature) const
{
GetPrivateKeys ().Sign (buf, len, signature);
};
};
}
}
#endif