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327 lines
7.4 KiB
C++
327 lines
7.4 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 <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/rand.h>
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#include "Base.h"
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#include "Tag.h"
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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 (uint8_t * priv = nullptr, uint8_t * pub = nullptr);
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const uint8_t * GetPublicKey ();
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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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bool m_IsUpdated;
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};
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// ElGamal
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class ElGamalEncryption
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{
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public:
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ElGamalEncryption (const uint8_t * key);
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~ElGamalEncryption ();
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void Encrypt (const uint8_t * data, int len, uint8_t * encrypted, bool zeroPadding = false) const;
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private:
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BN_CTX * ctx;
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BIGNUM * a, * b1;
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};
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bool ElGamalDecrypt (const uint8_t * key, const uint8_t * encrypted, uint8_t * data, bool zeroPadding = false);
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void GenerateElGamalKeyPair (uint8_t * priv, uint8_t * 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 defined(__x86_64__) || defined(__SSE__) // for Intel x84 or with SSE
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__asm__
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(
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"movups (%[buf]), %%xmm0 \n"
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"movups (%[other]), %%xmm1 \n"
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"pxor %%xmm1, %%xmm0 \n"
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"movups %%xmm0, (%[buf]) \n"
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:
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: [buf]"r"(buf), [other]"r"(other.buf)
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: "%xmm0", "%xmm1", "memory"
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);
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#else
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// TODO: implement it better
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for (int i = 0; i < 16; i++)
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buf[i] ^= other.buf[i];
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#endif
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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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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 AESNI
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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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class ECBEncryptionAESNI: public ECBCryptoAESNI
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{
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public:
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void SetKey (const AESKey& key) { ExpandKey (key); };
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void Encrypt (const ChipherBlock * in, ChipherBlock * out);
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};
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class ECBDecryptionAESNI: public ECBCryptoAESNI
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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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};
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typedef ECBEncryptionAESNI ECBEncryption;
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typedef ECBDecryptionAESNI ECBDecryption;
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#else // use openssl
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class ECBEncryption
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{
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public:
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void SetKey (const AESKey& key)
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{
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AES_set_encrypt_key (key, 256, &m_Key);
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}
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void Encrypt (const ChipherBlock * in, ChipherBlock * out)
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{
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AES_encrypt (in->buf, out->buf, &m_Key);
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}
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private:
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AES_KEY m_Key;
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};
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class ECBDecryption
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{
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public:
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void SetKey (const AESKey& key)
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{
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AES_set_decrypt_key (key, 256, &m_Key);
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}
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void Decrypt (const ChipherBlock * in, ChipherBlock * out)
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{
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AES_decrypt (in->buf, out->buf, &m_Key);
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}
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private:
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AES_KEY m_Key;
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};
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#endif
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class CBCEncryption
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{
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public:
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CBCEncryption () { memset (m_LastBlock.buf, 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 (m_LastBlock.buf, iv, 16); }; // 16 bytes
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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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private:
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ChipherBlock 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 (m_IV.buf, 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 (m_IV.buf, iv, 16); }; // 16 bytes
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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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private:
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ChipherBlock 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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#ifdef AESNI
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ECBEncryption m_LayerEncryption;
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#else
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CBCEncryption m_LayerEncryption;
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#endif
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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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#ifdef AESNI
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ECBDecryption m_LayerDecryption;
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#else
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CBCDecryption m_LayerDecryption;
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#endif
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};
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void InitCrypto (bool precomputation);
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void TerminateCrypto ();
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// take care about openssl version
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#include <openssl/opensslv.h>
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#if (OPENSSL_VERSION_NUMBER < 0x010100000) || defined(LIBRESSL_VERSION_NUMBER) // 1.1.0 or LibreSSL
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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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{ d->p = p; d->q = q; d->g = g; return 1; }
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inline int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
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{ d->pub_key = pub_key; d->priv_key = priv_key; return 1; }
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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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{ sig->r = r; sig->s = s; return 1; }
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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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{ sig->r = r; sig->s = s; return 1; }
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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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{ r->n = n; r->e = e; r->d = d; return 1; }
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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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{ dh->p = p; dh->q = q; dh->g = g; return 1; }
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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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#endif
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}
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}
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#endif
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