mirror of
https://github.com/PurpleI2P/i2pd.git
synced 2024-10-31 09:20:38 +00:00
383 lines
10 KiB
C++
383 lines
10 KiB
C++
#ifndef CRYPTO_H__
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#define CRYPTO_H__
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#include <inttypes.h>
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#include <string>
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#include <vector>
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#include <openssl/bn.h>
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#include <openssl/dh.h>
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#include <openssl/aes.h>
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#include <openssl/dsa.h>
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#include <openssl/ecdsa.h>
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#include <openssl/rsa.h>
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#include <openssl/sha.h>
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#include <openssl/evp.h>
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#include <openssl/rand.h>
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#include <openssl/engine.h>
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#include <openssl/opensslv.h>
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#include "Base.h"
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#include "Tag.h"
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#include "CPU.h"
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// recognize openssl version and features
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#if ((OPENSSL_VERSION_NUMBER < 0x010100000) || defined(LIBRESSL_VERSION_NUMBER)) // 1.0.2 and below or LibreSSL
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# define LEGACY_OPENSSL 1
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# define X509_getm_notBefore X509_get_notBefore
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# define X509_getm_notAfter X509_get_notAfter
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#else
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# define LEGACY_OPENSSL 0
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# define OPENSSL_HKDF 1
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# if (OPENSSL_VERSION_NUMBER >= 0x010101000) // 1.1.1
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# define OPENSSL_EDDSA 1
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# define OPENSSL_X25519 1
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# define OPENSSL_SIPHASH 1
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# endif
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# if !defined OPENSSL_NO_CHACHA && !defined OPENSSL_NO_POLY1305 // some builds might not include them
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# define OPENSSL_AEAD_CHACHA20_POLY1305 1
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# endif
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#endif
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namespace i2p
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{
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namespace crypto
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{
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bool bn2buf (const BIGNUM * bn, uint8_t * buf, size_t len);
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// DSA
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DSA * CreateDSA ();
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// RSA
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const BIGNUM * GetRSAE ();
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// DH
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class DHKeys
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{
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public:
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DHKeys ();
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~DHKeys ();
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void GenerateKeys ();
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const uint8_t * GetPublicKey () const { return m_PublicKey; };
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void Agree (const uint8_t * pub, uint8_t * shared);
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private:
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DH * m_DH;
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uint8_t m_PublicKey[256];
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};
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// x25519
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class X25519Keys
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{
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public:
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X25519Keys ();
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X25519Keys (const uint8_t * priv, const uint8_t * pub); // if pub is null, derive from priv
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~X25519Keys ();
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void GenerateKeys ();
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const uint8_t * GetPublicKey () const { return m_PublicKey; };
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void GetPrivateKey (uint8_t * priv) const;
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void Agree (const uint8_t * pub, uint8_t * shared);
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private:
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uint8_t m_PublicKey[32];
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#if OPENSSL_X25519
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EVP_PKEY_CTX * m_Ctx;
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EVP_PKEY * m_Pkey;
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#else
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BN_CTX * m_Ctx;
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uint8_t m_PrivateKey[32];
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#endif
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};
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// ElGamal
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void ElGamalEncrypt (const uint8_t * key, const uint8_t * data, uint8_t * encrypted, BN_CTX * ctx, bool zeroPadding = false);
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bool ElGamalDecrypt (const uint8_t * key, const uint8_t * encrypted, uint8_t * data, BN_CTX * ctx, bool zeroPadding = false);
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void GenerateElGamalKeyPair (uint8_t * priv, uint8_t * pub);
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// ECIES
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void ECIESEncrypt (const EC_GROUP * curve, const EC_POINT * key, const uint8_t * data, uint8_t * encrypted, BN_CTX * ctx, bool zeroPadding = false); // 222 bytes data, 514 bytes encrypted with zeropadding, 512 without
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bool ECIESDecrypt (const EC_GROUP * curve, const BIGNUM * key, const uint8_t * encrypted, uint8_t * data, BN_CTX * ctx, bool zeroPadding = false);
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void GenerateECIESKeyPair (const EC_GROUP * curve, BIGNUM *& priv, EC_POINT *& pub);
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// HMAC
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typedef i2p::data::Tag<32> MACKey;
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void HMACMD5Digest (uint8_t * msg, size_t len, const MACKey& key, uint8_t * digest);
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// AES
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struct ChipherBlock
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{
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uint8_t buf[16];
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void operator^=(const ChipherBlock& other) // XOR
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{
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if (!(((size_t)buf | (size_t)other.buf) & 0x03)) // multiple of 4 ?
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{
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for (int i = 0; i < 4; i++)
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reinterpret_cast<uint32_t *>(buf)[i] ^= reinterpret_cast<const uint32_t *>(other.buf)[i];
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}
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else
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{
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for (int i = 0; i < 16; i++)
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buf[i] ^= other.buf[i];
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}
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}
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};
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typedef i2p::data::Tag<32> AESKey;
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template<size_t sz>
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class AESAlignedBuffer // 16 bytes alignment
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{
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public:
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AESAlignedBuffer ()
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{
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m_Buf = m_UnalignedBuffer;
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uint8_t rem = ((size_t)m_Buf) & 0x0f;
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if (rem)
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m_Buf += (16 - rem);
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}
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operator uint8_t * () { return m_Buf; };
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operator const uint8_t * () const { return m_Buf; };
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ChipherBlock * GetChipherBlock () { return (ChipherBlock *)m_Buf; };
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const ChipherBlock * GetChipherBlock () const { return (const ChipherBlock *)m_Buf; };
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private:
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uint8_t m_UnalignedBuffer[sz + 15]; // up to 15 bytes alignment
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uint8_t * m_Buf;
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};
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#ifdef __AES__
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#ifdef ARM64AES
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void init_aesenc(void) __attribute__((constructor));
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#endif
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class ECBCryptoAESNI
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{
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public:
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uint8_t * GetKeySchedule () { return m_KeySchedule; };
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protected:
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void ExpandKey (const AESKey& key);
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private:
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AESAlignedBuffer<240> m_KeySchedule; // 14 rounds for AES-256, 240 bytes
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};
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#endif
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#ifdef __AES__
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class ECBEncryption: public ECBCryptoAESNI
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#else
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class ECBEncryption
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#endif
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{
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public:
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void SetKey (const AESKey& key);
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void Encrypt(const ChipherBlock * in, ChipherBlock * out);
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private:
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AES_KEY m_Key;
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};
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#ifdef __AES__
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class ECBDecryption: public ECBCryptoAESNI
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#else
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class ECBDecryption
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#endif
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{
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public:
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void SetKey (const AESKey& key);
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void Decrypt (const ChipherBlock * in, ChipherBlock * out);
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private:
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AES_KEY m_Key;
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};
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class CBCEncryption
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{
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public:
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CBCEncryption () { memset ((uint8_t *)m_LastBlock, 0, 16); };
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void SetKey (const AESKey& key) { m_ECBEncryption.SetKey (key); }; // 32 bytes
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void SetIV (const uint8_t * iv) { memcpy ((uint8_t *)m_LastBlock, iv, 16); }; // 16 bytes
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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);
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void Encrypt (const uint8_t * in, std::size_t len, uint8_t * out);
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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:
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AESAlignedBuffer<16> m_LastBlock;
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ECBEncryption m_ECBEncryption;
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};
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class CBCDecryption
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{
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public:
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CBCDecryption () { memset ((uint8_t *)m_IV, 0, 16); };
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void SetKey (const AESKey& key) { m_ECBDecryption.SetKey (key); }; // 32 bytes
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void SetIV (const uint8_t * iv) { memcpy ((uint8_t *)m_IV, iv, 16); }; // 16 bytes
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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);
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void Decrypt (const uint8_t * in, std::size_t len, uint8_t * out);
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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:
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AESAlignedBuffer<16> m_IV;
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ECBDecryption m_ECBDecryption;
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};
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class TunnelEncryption // with double IV encryption
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{
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public:
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void SetKeys (const AESKey& layerKey, const AESKey& ivKey)
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{
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m_LayerEncryption.SetKey (layerKey);
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m_IVEncryption.SetKey (ivKey);
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}
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void Encrypt (const uint8_t * in, uint8_t * out); // 1024 bytes (16 IV + 1008 data)
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private:
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ECBEncryption m_IVEncryption;
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CBCEncryption m_LayerEncryption;
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};
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class TunnelDecryption // with double IV encryption
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{
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public:
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void SetKeys (const AESKey& layerKey, const AESKey& ivKey)
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{
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m_LayerDecryption.SetKey (layerKey);
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m_IVDecryption.SetKey (ivKey);
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}
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void Decrypt (const uint8_t * in, uint8_t * out); // 1024 bytes (16 IV + 1008 data)
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private:
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ECBDecryption m_IVDecryption;
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CBCDecryption m_LayerDecryption;
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};
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// AEAD/ChaCha20/Poly1305
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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
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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
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void HKDF (const uint8_t * salt, const uint8_t * key, size_t keyLen, const std::string& info, uint8_t * out); // salt - 32, out - 64, info <= 32
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// init and terminate
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void InitCrypto (bool precomputation);
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void TerminateCrypto ();
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}
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}
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// take care about openssl below 1.1.0
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#if LEGACY_OPENSSL
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// define getters and setters introduced in 1.1.0
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inline int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)
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{
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if (d->p) BN_free (d->p);
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if (d->q) BN_free (d->q);
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if (d->g) BN_free (d->g);
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d->p = p; d->q = q; d->g = g; return 1;
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}
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inline int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
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{
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if (d->pub_key) BN_free (d->pub_key);
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if (d->priv_key) BN_free (d->priv_key);
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d->pub_key = pub_key; d->priv_key = priv_key; return 1;
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}
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inline void DSA_get0_key(const DSA *d, const BIGNUM **pub_key, const BIGNUM **priv_key)
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{ *pub_key = d->pub_key; *priv_key = d->priv_key; }
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inline int DSA_SIG_set0(DSA_SIG *sig, BIGNUM *r, BIGNUM *s)
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{
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if (sig->r) BN_free (sig->r);
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if (sig->s) BN_free (sig->s);
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sig->r = r; sig->s = s; return 1;
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}
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inline void DSA_SIG_get0(const DSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
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{ *pr = sig->r; *ps = sig->s; }
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inline int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
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{
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if (sig->r) BN_free (sig->r);
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if (sig->s) BN_free (sig->s);
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sig->r = r; sig->s = s; return 1;
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}
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inline void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
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{ *pr = sig->r; *ps = sig->s; }
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inline int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d)
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{
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if (r->n) BN_free (r->n);
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if (r->e) BN_free (r->e);
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if (r->d) BN_free (r->d);
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r->n = n; r->e = e; r->d = d; return 1;
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}
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inline void RSA_get0_key(const RSA *r, const BIGNUM **n, const BIGNUM **e, const BIGNUM **d)
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{ *n = r->n; *e = r->e; *d = r->d; }
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inline int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
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{
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if (dh->p) BN_free (dh->p);
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if (dh->q) BN_free (dh->q);
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if (dh->g) BN_free (dh->g);
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dh->p = p; dh->q = q; dh->g = g; return 1;
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}
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inline int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
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{
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if (dh->pub_key) BN_free (dh->pub_key);
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if (dh->priv_key) BN_free (dh->priv_key);
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dh->pub_key = pub_key; dh->priv_key = priv_key; return 1;
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}
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inline void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key)
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{ *pub_key = dh->pub_key; *priv_key = dh->priv_key; }
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inline RSA *EVP_PKEY_get0_RSA(EVP_PKEY *pkey)
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{ return pkey->pkey.rsa; }
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inline EVP_MD_CTX *EVP_MD_CTX_new ()
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{ return EVP_MD_CTX_create(); }
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inline void EVP_MD_CTX_free (EVP_MD_CTX *ctx)
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{ EVP_MD_CTX_destroy (ctx); }
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// ssl
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#define TLS_method TLSv1_method
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#endif
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#endif
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