mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-22 06:17:48 +00:00
157 lines
3.0 KiB
C++
157 lines
3.0 KiB
C++
/*
|
|
* Based on public domain code available at: http://cr.yp.to/snuffle.html
|
|
*
|
|
* This therefore is public domain.
|
|
*/
|
|
|
|
#ifndef ZT_SALSA20_HPP
|
|
#define ZT_SALSA20_HPP
|
|
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "Constants.hpp"
|
|
#include "Utils.hpp"
|
|
|
|
#ifdef ZT_USE_LIBSODIUM
|
|
|
|
#include <sodium/crypto_stream_salsa20.h>
|
|
#include <sodium/crypto_stream_salsa2012.h>
|
|
|
|
namespace ZeroTier {
|
|
|
|
/**
|
|
* Salsa20 stream cipher
|
|
*/
|
|
class Salsa20
|
|
{
|
|
public:
|
|
Salsa20() {}
|
|
~Salsa20() { Utils::burn(_k,sizeof(_k)); }
|
|
|
|
/**
|
|
* @param key 256-bit (32 byte) key
|
|
* @param iv 64-bit initialization vector
|
|
*/
|
|
Salsa20(const void *key,const void *iv)
|
|
{
|
|
memcpy(_k,key,32);
|
|
memcpy(&_iv,iv,8);
|
|
}
|
|
|
|
/**
|
|
* Initialize cipher
|
|
*
|
|
* @param key Key bits
|
|
* @param iv 64-bit initialization vector
|
|
*/
|
|
inline void init(const void *key,const void *iv)
|
|
{
|
|
memcpy(_k,key,32);
|
|
memcpy(&_iv,iv,8);
|
|
}
|
|
|
|
/**
|
|
* Encrypt/decrypt data using Salsa20/12
|
|
*
|
|
* @param in Input data
|
|
* @param out Output buffer
|
|
* @param bytes Length of data
|
|
*/
|
|
inline void crypt12(const void *in,void *out,unsigned int bytes)
|
|
{
|
|
crypto_stream_salsa2012_xor(reinterpret_cast<unsigned char *>(out),reinterpret_cast<const unsigned char *>(in),bytes,reinterpret_cast<const unsigned char *>(&_iv),reinterpret_cast<const unsigned char *>(_k));
|
|
}
|
|
|
|
/**
|
|
* Encrypt/decrypt data using Salsa20/20
|
|
*
|
|
* @param in Input data
|
|
* @param out Output buffer
|
|
* @param bytes Length of data
|
|
*/
|
|
inline void crypt20(const void *in,void *out,unsigned int bytes)
|
|
{
|
|
crypto_stream_salsa20_xor(reinterpret_cast<unsigned char *>(out),reinterpret_cast<const unsigned char *>(in),bytes,reinterpret_cast<const unsigned char *>(&_iv),reinterpret_cast<const unsigned char *>(_k));
|
|
}
|
|
|
|
private:
|
|
uint64_t _k[4];
|
|
uint64_t _iv;
|
|
};
|
|
|
|
} // namespace ZeroTier
|
|
|
|
#else // !ZT_USE_LIBSODIUM
|
|
|
|
#if (!defined(ZT_SALSA20_SSE)) && (defined(__SSE2__) || defined(__WINDOWS__))
|
|
#define ZT_SALSA20_SSE 1
|
|
#endif
|
|
|
|
#ifdef ZT_SALSA20_SSE
|
|
#include <emmintrin.h>
|
|
#endif // ZT_SALSA20_SSE
|
|
|
|
namespace ZeroTier {
|
|
|
|
/**
|
|
* Salsa20 stream cipher
|
|
*/
|
|
class Salsa20
|
|
{
|
|
public:
|
|
Salsa20() {}
|
|
~Salsa20() { Utils::burn(&_state,sizeof(_state)); }
|
|
|
|
/**
|
|
* @param key 256-bit (32 byte) key
|
|
* @param iv 64-bit initialization vector
|
|
*/
|
|
Salsa20(const void *key,const void *iv)
|
|
{
|
|
init(key,iv);
|
|
}
|
|
|
|
/**
|
|
* Initialize cipher
|
|
*
|
|
* @param key Key bits
|
|
* @param iv 64-bit initialization vector
|
|
*/
|
|
void init(const void *key,const void *iv);
|
|
|
|
/**
|
|
* Encrypt/decrypt data using Salsa20/12
|
|
*
|
|
* @param in Input data
|
|
* @param out Output buffer
|
|
* @param bytes Length of data
|
|
*/
|
|
void crypt12(const void *in,void *out,unsigned int bytes);
|
|
|
|
/**
|
|
* Encrypt/decrypt data using Salsa20/20
|
|
*
|
|
* @param in Input data
|
|
* @param out Output buffer
|
|
* @param bytes Length of data
|
|
*/
|
|
void crypt20(const void *in,void *out,unsigned int bytes);
|
|
|
|
private:
|
|
union {
|
|
#ifdef ZT_SALSA20_SSE
|
|
__m128i v[4];
|
|
#endif // ZT_SALSA20_SSE
|
|
uint32_t i[16];
|
|
} _state;
|
|
};
|
|
|
|
} // namespace ZeroTier
|
|
|
|
#endif // ZT_USE_LIBSODIUM
|
|
|
|
#endif
|