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added new elliptic curve crypto methods

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This commit is contained in:
Daniel Larimer 2013-08-10 02:33:15 -04:00
parent 7b8494d7f8
commit 1f03f67d1d
2 changed files with 46 additions and 1 deletions
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1
include/fc/crypto/elliptic.hpp
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@ -36,6 +36,7 @@ namespace fc {
bool valid()const;
public_key mult( const fc::sha256& offset );
public_key add( const fc::sha256& offset )const;
public_key( public_key&& pk );
public_key& operator=( public_key&& pk );

46
src/crypto/elliptic.cpp
View file

@ -258,6 +258,50 @@ struct ssl_bignum
return rtn;
}
public_key public_key::add( const fc::sha256& digest )const
{
try {
ec_group group(EC_GROUP_new_by_curve_name(NID_secp256k1));
bn_ctx ctx(BN_CTX_new());
fc::bigint digest_bi( (char*)&digest, sizeof(digest) );
ssl_bignum order;
EC_GROUP_get_order(group, order, ctx);
if( digest_bi > fc::bigint(order) )
{
FC_THROW_EXCEPTION( exception, "digest > group order" );
}
public_key digest_key = private_key::regenerate(digest).get_public_key();
const EC_POINT* digest_point = EC_KEY_get0_public_key( digest_key.my->_key );
// get point from this public key
const EC_POINT* master_pub = EC_KEY_get0_public_key( my->_key );
ssl_bignum z;
BN_bin2bn((unsigned char*)&digest, sizeof(digest), z);
// multiply by digest
ssl_bignum one;
BN_one(one);
ec_point result(EC_POINT_new(group));
EC_POINT_add(group, result, digest_point, master_pub, ctx);
if (EC_POINT_is_at_infinity(group, result))
{
FC_THROW_EXCEPTION( exception, "point at infinity" );
}
public_key rtn;
rtn.my->_key = EC_KEY_new_by_curve_name( NID_secp256k1 );
EC_KEY_set_public_key(rtn.my->_key,result);
return rtn;
} FC_RETHROW_EXCEPTIONS( debug, "digest: ${digest}", ("digest",digest) );
}
private_key::private_key()
{}
@ -268,8 +312,8 @@ struct ssl_bignum
BN_bin2bn((unsigned char*)&offset, sizeof(offset), z);
ec_group group(EC_GROUP_new_by_curve_name(NID_secp256k1));
ssl_bignum order;
bn_ctx ctx(BN_CTX_new());
ssl_bignum order;
EC_GROUP_get_order(group, order, ctx);
// secexp = (seed + z) % order