63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
/*
|
|
* File: hmac.hpp
|
|
* Author: Peter Conrad
|
|
*
|
|
* Created on 1. Juli 2015, 21:48
|
|
*/
|
|
|
|
#ifndef HMAC_HPP
|
|
#define HMAC_HPP
|
|
|
|
#include <fc/crypto/sha224.hpp>
|
|
#include <fc/crypto/sha256.hpp>
|
|
#include <fc/crypto/sha512.hpp>
|
|
|
|
namespace fc {
|
|
|
|
template<typename H>
|
|
class hmac
|
|
{
|
|
public:
|
|
hmac() {}
|
|
|
|
H digest( const char* c, uint32_t c_len, const char* d, uint32_t d_len )
|
|
{
|
|
encoder.reset();
|
|
add_key(c, c_len, 0x36);
|
|
encoder.write( d, d_len );
|
|
H intermediate = encoder.result();
|
|
|
|
encoder.reset();
|
|
add_key(c, c_len, 0x5c);
|
|
encoder.write( intermediate.data(), intermediate.data_size() );
|
|
return encoder.result();
|
|
}
|
|
|
|
private:
|
|
void add_key( const char* c, const uint32_t c_len, char pad )
|
|
{
|
|
if ( c_len > internal_block_size() )
|
|
{
|
|
H hash = H::hash( c, c_len );
|
|
add_key( hash.data(), hash.data_size(), pad );
|
|
}
|
|
else
|
|
for (unsigned int i = 0; i < internal_block_size(); i++ )
|
|
{
|
|
encoder.put( pad ^ ((i < c_len) ? *c++ : 0) );
|
|
}
|
|
}
|
|
|
|
unsigned int internal_block_size() const;
|
|
|
|
H dummy;
|
|
typename H::encoder encoder;
|
|
};
|
|
|
|
typedef hmac<fc::sha224> hmac_sha224;
|
|
typedef hmac<fc::sha256> hmac_sha256;
|
|
typedef hmac<fc::sha512> hmac_sha512;
|
|
}
|
|
|
|
#endif /* HMAC_HPP */
|
|
|