I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/

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/*
* Copyright (c) 2013-2023, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#ifndef CRYPTO_H__
#define CRYPTO_H__
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#include <inttypes.h>
#include <string>
#include <vector>
#include <openssl/bn.h>
#include <openssl/dh.h>
#include <openssl/aes.h>
#include <openssl/dsa.h>
#include <openssl/ecdsa.h>
#include <openssl/rsa.h>
#include <openssl/sha.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/engine.h>
#include <openssl/opensslv.h>
#include "Base.h"
#include "Tag.h"
#include "CPU.h"
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// recognize openssl version and features
#if (defined(LIBRESSL_VERSION_NUMBER) && (LIBRESSL_VERSION_NUMBER >= 0x3050200fL)) // LibreSSL 3.5.2 and above
# define LEGACY_OPENSSL 0
#elif ((OPENSSL_VERSION_NUMBER < 0x010100000) || defined(LIBRESSL_VERSION_NUMBER)) // 1.0.2 and below or LibreSSL
# define LEGACY_OPENSSL 1
# define X509_getm_notBefore X509_get_notBefore
# define X509_getm_notAfter X509_get_notAfter
#else
# define LEGACY_OPENSSL 0
# if (OPENSSL_VERSION_NUMBER >= 0x010101000) // 1.1.1
# define OPENSSL_HKDF 1
# define OPENSSL_EDDSA 1
# define OPENSSL_X25519 1
# if (OPENSSL_VERSION_NUMBER != 0x030000000) // 3.0.0, regression in SipHash
# define OPENSSL_SIPHASH 1
# endif
# endif
# if !defined OPENSSL_NO_CHACHA && !defined OPENSSL_NO_POLY1305 // some builds might not include them
# define OPENSSL_AEAD_CHACHA20_POLY1305 1
# endif
#endif
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namespace i2p
{
namespace crypto
{
bool bn2buf (const BIGNUM * bn, uint8_t * buf, size_t len);
// DSA
DSA * CreateDSA ();
// RSA
const BIGNUM * GetRSAE ();
// x25519
class X25519Keys
{
public:
X25519Keys ();
X25519Keys (const uint8_t * priv, const uint8_t * pub); // if pub is null, derive from priv
~X25519Keys ();
void GenerateKeys ();
const uint8_t * GetPublicKey () const { return m_PublicKey; };
void GetPrivateKey (uint8_t * priv) const;
void SetPrivateKey (const uint8_t * priv, bool calculatePublic = false);
bool Agree (const uint8_t * pub, uint8_t * shared);
bool IsElligatorIneligible () const { return m_IsElligatorIneligible; }
void SetElligatorIneligible () { m_IsElligatorIneligible = true; }
private:
uint8_t m_PublicKey[32];
#if OPENSSL_X25519
EVP_PKEY_CTX * m_Ctx;
EVP_PKEY * m_Pkey;
#else
BN_CTX * m_Ctx;
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uint8_t m_PrivateKey[32];
#endif
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bool m_IsElligatorIneligible = false; // true if definitely ineligible
};
// ElGamal
void ElGamalEncrypt (const uint8_t * key, const uint8_t * data, uint8_t * encrypted); // 222 bytes data, 514 bytes encrypted
bool ElGamalDecrypt (const uint8_t * key, const uint8_t * encrypted, uint8_t * data); // 514 bytes encrypted, 222 data
void GenerateElGamalKeyPair (uint8_t * priv, uint8_t * pub);
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// ECIES
void ECIESEncrypt (const EC_GROUP * curve, const EC_POINT * key, const uint8_t * data, uint8_t * encrypted); // 222 bytes data, 514 bytes encrypted
bool ECIESDecrypt (const EC_GROUP * curve, const BIGNUM * key, const uint8_t * encrypted, uint8_t * data); // 514 bytes encrypted, 222 data
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void GenerateECIESKeyPair (const EC_GROUP * curve, BIGNUM *& priv, EC_POINT *& pub);
// AES
struct ChipherBlock
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{
uint8_t buf[16];
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void operator^=(const ChipherBlock& other) // XOR
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{
if (!(((size_t)buf | (size_t)other.buf) & 0x03)) // multiple of 4 ?
{
for (int i = 0; i < 4; i++)
reinterpret_cast<uint32_t *>(buf)[i] ^= reinterpret_cast<const uint32_t *>(other.buf)[i];
}
else
{
for (int i = 0; i < 16; i++)
buf[i] ^= other.buf[i];
}
}
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};
typedef i2p::data::Tag<32> AESKey;
template<size_t sz>
class AESAlignedBuffer // 16 bytes alignment
{
public:
AESAlignedBuffer ()
{
m_Buf = m_UnalignedBuffer;
uint8_t rem = ((size_t)m_Buf) & 0x0f;
if (rem)
m_Buf += (16 - rem);
}
operator uint8_t * () { return m_Buf; };
operator const uint8_t * () const { return m_Buf; };
ChipherBlock * GetChipherBlock () { return (ChipherBlock *)m_Buf; };
const ChipherBlock * GetChipherBlock () const { return (const ChipherBlock *)m_Buf; };
private:
uint8_t m_UnalignedBuffer[sz + 15]; // up to 15 bytes alignment
uint8_t * m_Buf;
};
#if SUPPORTS_AES
class ECBCryptoAESNI
{
public:
uint8_t * GetKeySchedule () { return m_KeySchedule; };
protected:
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void ExpandKey (const AESKey& key);
private:
AESAlignedBuffer<240> m_KeySchedule; // 14 rounds for AES-256, 240 bytes
};
#endif
#if SUPPORTS_AES
class ECBEncryption: public ECBCryptoAESNI
#else
class ECBEncryption
#endif
{
public:
void SetKey (const AESKey& key);
void Encrypt(const ChipherBlock * in, ChipherBlock * out);
private:
AES_KEY m_Key;
};
#if SUPPORTS_AES
class ECBDecryption: public ECBCryptoAESNI
#else
class ECBDecryption
#endif
{
public:
void SetKey (const AESKey& key);
void Decrypt (const ChipherBlock * in, ChipherBlock * out);
private:
AES_KEY m_Key;
};
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class CBCEncryption
{
public:
CBCEncryption () { memset ((uint8_t *)m_LastBlock, 0, 16); };
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void SetKey (const AESKey& key) { m_ECBEncryption.SetKey (key); }; // 32 bytes
void SetIV (const uint8_t * iv) { memcpy ((uint8_t *)m_LastBlock, iv, 16); }; // 16 bytes
void GetIV (uint8_t * iv) const { memcpy (iv, (const uint8_t *)m_LastBlock, 16); };
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void Encrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out);
void Encrypt (const uint8_t * in, std::size_t len, uint8_t * out);
void Encrypt (const uint8_t * in, uint8_t * out); // one block
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ECBEncryption & ECB() { return m_ECBEncryption; }
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private:
AESAlignedBuffer<16> m_LastBlock;
ECBEncryption m_ECBEncryption;
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};
class CBCDecryption
{
public:
CBCDecryption () { memset ((uint8_t *)m_IV, 0, 16); };
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void SetKey (const AESKey& key) { m_ECBDecryption.SetKey (key); }; // 32 bytes
void SetIV (const uint8_t * iv) { memcpy ((uint8_t *)m_IV, iv, 16); }; // 16 bytes
void GetIV (uint8_t * iv) const { memcpy (iv, (const uint8_t *)m_IV, 16); };
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void Decrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out);
void Decrypt (const uint8_t * in, std::size_t len, uint8_t * out);
void Decrypt (const uint8_t * in, uint8_t * out); // one block
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ECBDecryption & ECB() { return m_ECBDecryption; }
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private:
AESAlignedBuffer<16> m_IV;
ECBDecryption m_ECBDecryption;
};
class TunnelEncryption // with double IV encryption
{
public:
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void SetKeys (const AESKey& layerKey, const AESKey& ivKey)
{
m_LayerEncryption.SetKey (layerKey);
m_IVEncryption.SetKey (ivKey);
}
void Encrypt (const uint8_t * in, uint8_t * out); // 1024 bytes (16 IV + 1008 data)
private:
ECBEncryption m_IVEncryption;
CBCEncryption m_LayerEncryption;
};
class TunnelDecryption // with double IV encryption
{
public:
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void SetKeys (const AESKey& layerKey, const AESKey& ivKey)
{
m_LayerDecryption.SetKey (layerKey);
m_IVDecryption.SetKey (ivKey);
}
void Decrypt (const uint8_t * in, uint8_t * out); // 1024 bytes (16 IV + 1008 data)
private:
ECBDecryption m_IVDecryption;
CBCDecryption m_LayerDecryption;
};
// AEAD/ChaCha20/Poly1305
bool AEADChaCha20Poly1305 (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen, const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len, bool encrypt); // msgLen is len without tag
void AEADChaCha20Poly1305Encrypt (const std::vector<std::pair<uint8_t *, size_t> >& bufs, const uint8_t * key, const uint8_t * nonce, uint8_t * mac); // encrypt multiple buffers with zero ad
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// ChaCha20
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void ChaCha20 (const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out);
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// HKDF
void HKDF (const uint8_t * salt, const uint8_t * key, size_t keyLen, const std::string& info, uint8_t * out, size_t outLen = 64); // salt - 32, out - 32 or 64, info <= 32
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// Noise
struct NoiseSymmetricState
{
uint8_t m_H[32] /*h*/, m_CK[64] /*[ck, k]*/;
void MixHash (const uint8_t * buf, size_t len);
void MixHash (const std::vector<std::pair<uint8_t *, size_t> >& bufs);
void MixKey (const uint8_t * sharedSecret);
};
void InitNoiseNState (NoiseSymmetricState& state, const uint8_t * pub); // Noise_N (tunnels, router)
void InitNoiseXKState (NoiseSymmetricState& state, const uint8_t * pub); // Noise_XK (NTCP2)
void InitNoiseXKState1 (NoiseSymmetricState& state, const uint8_t * pub); // Noise_XK (SSU2)
void InitNoiseIKState (NoiseSymmetricState& state, const uint8_t * pub); // Noise_IK (ratchets)
// init and terminate
void InitCrypto (bool precomputation, bool aesni, bool force);
void TerminateCrypto ();
}
}
// take care about openssl below 1.1.0
#if LEGACY_OPENSSL
// define getters and setters introduced in 1.1.0
inline int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)
{
if (d->p) BN_free (d->p);
if (d->q) BN_free (d->q);
if (d->g) BN_free (d->g);
d->p = p; d->q = q; d->g = g; return 1;
}
inline int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
{
if (d->pub_key) BN_free (d->pub_key);
if (d->priv_key) BN_free (d->priv_key);
d->pub_key = pub_key; d->priv_key = priv_key; return 1;
}
inline void DSA_get0_key(const DSA *d, const BIGNUM **pub_key, const BIGNUM **priv_key)
{ *pub_key = d->pub_key; *priv_key = d->priv_key; }
inline int DSA_SIG_set0(DSA_SIG *sig, BIGNUM *r, BIGNUM *s)
{
if (sig->r) BN_free (sig->r);
if (sig->s) BN_free (sig->s);
sig->r = r; sig->s = s; return 1;
}
inline void DSA_SIG_get0(const DSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
{ *pr = sig->r; *ps = sig->s; }
inline int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
{
if (sig->r) BN_free (sig->r);
if (sig->s) BN_free (sig->s);
sig->r = r; sig->s = s; return 1;
}
inline void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
{ *pr = sig->r; *ps = sig->s; }
inline int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d)
{
if (r->n) BN_free (r->n);
if (r->e) BN_free (r->e);
if (r->d) BN_free (r->d);
r->n = n; r->e = e; r->d = d; return 1;
}
inline void RSA_get0_key(const RSA *r, const BIGNUM **n, const BIGNUM **e, const BIGNUM **d)
{ *n = r->n; *e = r->e; *d = r->d; }
inline int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
{
if (dh->p) BN_free (dh->p);
if (dh->q) BN_free (dh->q);
if (dh->g) BN_free (dh->g);
dh->p = p; dh->q = q; dh->g = g; return 1;
}
inline int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
{
if (dh->pub_key) BN_free (dh->pub_key);
if (dh->priv_key) BN_free (dh->priv_key);
dh->pub_key = pub_key; dh->priv_key = priv_key; return 1;
}
inline void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key)
{ *pub_key = dh->pub_key; *priv_key = dh->priv_key; }
inline RSA *EVP_PKEY_get0_RSA(EVP_PKEY *pkey)
{ return pkey->pkey.rsa; }
inline EVP_MD_CTX *EVP_MD_CTX_new ()
{ return EVP_MD_CTX_create(); }
inline void EVP_MD_CTX_free (EVP_MD_CTX *ctx)
{ EVP_MD_CTX_destroy (ctx); }
// ssl
#define TLS_method TLSv1_method
#endif
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#endif