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adding child key derivation for ecc keys

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This commit is contained in:
Daniel Larimer 2015-07-23 18:45:35 -04:00
parent 2808c02cc7
commit d76a15ec89
2 changed files with 22 additions and 0 deletions
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4
include/fc/crypto/elliptic.hpp
View file

@ -46,6 +46,8 @@ namespace fc {
public_key( const public_key_point_data& v );
public_key( const compact_signature& c, const fc::sha256& digest, bool check_canonical = true );
public_key child( const fc::sha256& offset )const;
bool valid()const;
/** Computes new pubkey = generator * offset + old pubkey ?! */
// public_key mult( const fc::sha256& offset )const;
@ -96,6 +98,8 @@ namespace fc {
static private_key generate();
static private_key regenerate( const fc::sha256& secret );
private_key child( const fc::sha256& offset )const;
/**
* This method of generation enables creating a new private key in a deterministic manner relative to
* an initial seed. A public_key created from the seed can be multiplied by the offset to calculate

18
src/crypto/elliptic_common.cpp
View file

@ -1,5 +1,6 @@
#include <fc/crypto/base58.hpp>
#include <fc/crypto/elliptic.hpp>
#include <fc/io/raw.hpp>
/* stuff common to all ecc implementations */
@ -9,6 +10,23 @@ namespace fc { namespace ecc {
return public_key(data);
}
public_key public_key::child( const fc::sha256& offset )const
{
fc::sha256::encoder enc;
fc::raw::pack( enc, *this );
fc::raw::pack( enc, offset );
return add( enc.result() );
}
private_key private_key::child( const fc::sha256& offset )const
{
fc::sha256::encoder enc;
fc::raw::pack( enc, get_public_key() );
fc::raw::pack( enc, offset );
return generate_from_seed( get_secret(), enc.result() );
}
std::string public_key::to_base58( const public_key_data &key )
{
uint32_t check = (uint32_t)sha256::hash(key.data, sizeof(key))._hash[0];